This section has been written to cover most (but not all) situations that you will encounter. Depending on the requirements of your specific project, you may have to add material, delete items, or modify what is currently written. The Division of Facilities Development expects changes and comments from you.

flounderconvoyElectronics - Devices

Nov 15, 2013 (3 years and 6 months ago)

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DFD Project No.

23 09 14
-
1

SECTION
23 09 14

1

PNEUMATIC AND ELECTRIC
INSTRUMENTATION AND CONTROL DEVICES FOR HVAC

2

BASED ON
DFD

MASTER SPECIFICATION DATED
6/25
/2013

3


4

This section has been written to cover most (but not all) situations that you will encounter.
5

Depending on the requirements of your specific project, you may have to add material, delete
6

items, or modify what is currently written. The Division of
Facilit
ies Development

expects
7

changes and comments from you.

8


9

P A R T 1
-

G E N E R A L

10


11

SCOPE

12

This sections includes pneumatic control system specifications for all HVAC work as well as related
13

pneumatic control for systems found in other specification secti
ons. Included are the following topics:

14


15

PART 1
-

GENERAL

16


Scope

17


Point List

18


Related Work

19


Reference

20


Work Not Included

21


Quality Assurance

22


Reference Standards

23


System Description

24


Submittals

25


Demolition

26


Design Criteria

27


Operation and Maintenance Data

28


Material Delivery and Storage

29

PART 2
-

PRODUCTS

30


Air Piping

31


Control Air Supply

32


Air Compressors

33


Surge Tanks

34


Refri
gerated Air Dryers

35


Pressure Reducing Air Valves

36


Control Dampers

37


Control Valves

38


Control System Instrumentation

39


Thermostat Guards

40


Electric/Electronic Thermostats

41


Pneumatic Thermostats


42

Pneumatic
Humidistats

43


Receiver Controllers

44


Pneumatic
Transmitters

45


Pneumatic System Accessories

46

Duct Smoke Detector and Fire Alarm Interface Modules

47


Air Flow Stations

48


Water Flow Measurement

49


Steam Flow Measu
rement

50


Time Clocks

51


Temperature Control Panels

52


Temperature Sensors

53


Humidity Sensors

54


Pressure Transducers (Air)

55


Pressure Transducers (Liquid/Steam)

56


Differential Pressure Switches

57


Current Status Switches


58


Electric to Pneumatic Transducers

59


Carbon Dioxide (CO2) Sensor

60


Condensation
Monitors

61


Fume Hood Presence Sensors

62


Power Supplies

63

PART 3
-

EXECUTION

64

DFD Project No.

23 09 14
-
2


Installation

1


Air Piping

2


Wire and Air Piping Conduit and Tubing Installation Schedule

3


Air Compressors

4


Refrigerated Air Dryers

5


Control and Smoke Dampers

6


Control Valves

7


Control System Instrumentation

8


Room Thermostats and Temperature Sensors

9


Low Limit Thermostats (Freezestats)

10


Air Flow Stations

11


Liquid and Steam F
low Sensors

12


Pressure Transducers


13


Temperature Control Panels

14

Differential Pressure Switches


15

Air Pressure Safety Switches

16


Current Status Switches


17


Construction Verification

18


Agency Training

19


20


21

POINT LIST

(
Section 23 09 15
)

22

This point list should detail every point wired to the DDC controllers provided under Section 23
23

09 23 or 23 09 24

and/or 23 09 25

and should be used to clarify the scope of work for the
24

contractor providing work under this Section
.

Do not use one point chart for multiple systems
25

unless the systems have completely identical points.

Use point list template
s

provided by
DFD
.


26


27

RELAT
ED WORK

28

Section 01 91 01
or
01 91 02


Commissioning Process

29

Section
23
08

0
0



Commissioning
of HVAC

30

Section 23 05 93
-

Testing, Adjusting, and Balancing for HVAC

-

Coordination

31

Section 23 09 15
-

Direct

Digital Control Input/Output Point Summary Tables

32

D
elete 23 09 24 or 23 09 23

and/or 23 09 25

depending on whether the DDC controls are bid or
33

negotiated

and/or integrated
.

34

Section 23 09 23
-

Direct Digital Control System for HVAC

35

Section 23 09 24
-

Direct Digital Control System for HVAC (Informational pur
poses only)

36

Section 23 09 25
-

Direct Digital Control System for Integrated Terminal Units

37

Section 23 09 93
-

Sequence of Operation

38

Section 23 33 00
-

Ductwork Accessories
-

for control damper installation

39


40

Division 23
-

HVAC
-

Equipment provided to be
controlled or monitored

41

Division
26
-

Electrical

-

I
nstallation requirements

& Equipment provided to be controlled or monitored

42

Division 28
-

Electronic Safety and Security

43


44

REFERENCE

45

Applicable provisions of Division 1 govern work under this section.

46


47


48

WORK NOT INCLUDED

49

Include the following
sentence
only when working with a central campus automation system or
50

an existing building undergoing remodeling or addition and the existing DDC system will be
51

extended. Contact
DFD

engineering personnel if there a
re questions.

52


53

Direct digital controls and energy management interface, as specified in Section
23 09 24
.

54


55

QUALITY ASSURANCE

56

Installing contractor must be a manufacturer's branch office or an authorized representative of
a Direct
57

Digital C
ontrol

(DDC)

equi
pment manufacturer that provides engineering and commissioning of
the DDC
58

equipment
.

S
ubmit written confirmation of such authorization from the manufacturer. Indicate in letter of
59

authorization that installing contractor has successfully completed all nec
essary training required for
60

engineering, installation, and commissioning of equipment and systems and that such authorization has
61

been in effect for a period of not less than three years.

DDC equipment may

or may
not be required to be
62

installed by this c
ontractor as part of the project, but the intent of th
is

quality assurance specification is to
63

DFD Project No.

23 09 14
-
3

ensure that the installing contractor has the capabilities to engineer, install, and commission the field
1

devices supplied under this section for temperature con
trol.

2


3

REFERENCE STANDARDS

4

ANSI B16.22

Wrought Copper and Wrought Copper Alloy Solder Joint Pressure Fittings

5

ANSI/ASTM B32

Specification for Solder Metal

6

ASTM B75

Seamless Copper Tube

7

ASTM D1693

Environmental Stress
-
Cracking of Ethylene Plastics

8

ASTM D 635

Standard Test Method for Rate of Burning and/or Extent and Time of Burning of
9

Plastics in a Horizontal Position

10

UL 94

Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

11

AMCA 500
-
D

Laboratory Method of Testing
Dampers for Rating

12


13

SYSTEM DESCRIPTION

14

Select or modify one of the following descriptions after discussion with
DFD
.

15


16

System is to be pneumatic.

17


18

System is to be electric/electronic.

19


20

System is to use direct digital control logic with pneumatic actuation.

21


22

System is to use direct digital control with electric actuation

for air handling units; direct digital control
23

with electric actuation
for room temperature, room humidity, and terminal airflow control; and electric
24

control for other terminal units.

25


26

Syste
m is to use direct digital control with pneumatic actuation for air handling units;
direct digital
control
27

with electric actuation
for room temperature, room humidity, and terminal airflow control; and electric or
28

pneumatic control for other terminal units
.

29


30

All pneumatic tubing and electrical wiring are to be permanently tagged or labeled (within one inch of
31

terminal strip) with a numbering system to correspond with the "Record Drawings".


Tags or labels shall be
32

printed not hand written.

33


34

SUBMITTALS

35

Inclu
de the following information:

36


37

Manufacturer’s

data sheets indicating model number, pressure/temperature ratings, capacity, methods and
38

materials of construction, installation instructions, and recommended maintenance. General catalog sheets
39

showing a series of the same device is not acceptable unless

the specific model is clearly marked.

40


41

Schematic flow diagrams of systems showing fans, pumps, coils, dampers, valves, and other control
42

devices. Label each device with setting or adjustable range of control. Indicate all wiring, clearly,
43

differentiatin
g between factory and field installed wiring. Wiring should be shown in schematics that detail
44

contact states, relay references, etc. Diagrammatic representations of devices alone are not acceptable.

45


46

Details of construction, layout, and location of eac
h temperature control panel within the building,
47

including instruments location in panel and labeling. Also include on drawings location of mechanical
48

equipment controlled (room number), horsepower and flow of motorized equipment (when this data is
49

availa
ble on plans), locations of all remote sensors and control devices (either by room number or column
50

lines).

51


52

Schedule of control dampers indicating size, leakage rating, arrangement, pressure drop at design airflow,
53

and number and size of operators require
d.

54


55

Schedule of control valves indicating system in which the device is to be used, rated capacity, flow
56

coefficient, flow required by device served, actual pressure drop at design flow, size of operator required,
57

close
-
off pressure, and locations where va
lves are to be installed.

58


59

A complete description of each control sequence for equipment that is not controlled by direct digital
60

controls. Direct digital controlled equipment control sequences will be provided by the DDC control
61

contractor.

62


63

Calculations

completed to determine size of control air compressor(s) and dryer (s).

64

DFD Project No.

23 09 14
-
4


1

Prior to request for final payment, submit record documents which accurately record actual location of
2

control components including panels, thermostats, wiring, and sensors. Incorpo
rate changes required
3

during installation and start
-
up.

4


5

Include the following paragraphs only when working with DDC Control System that is not part
6

of the bid and negotiated by the State utilizing section
23 09 24
. Contact
DFD

engineering
7

personnel if th
ere are questions.

8


9

Provide a complete set of Submittal Drawings to the
23 09 24

DDC Contractor to enable them to
10

coordinate the interfacing of the
23 09 14

controls with the
23 09 24

supplied controls. The
23 09 24

11

contractor is also required to provide
any information regarding their supplied control equipment to the
23
12

09 14

contractor so that the
23 09 14

contractor can complete his engineered Submittal Drawings.

13


14

Provide a complete set of
control
Record Drawings to the
23 09 24

DDC Contractor to enabl
e them to
15

provide a complete composite set of drawings incorporating DDC and electric/pneumatic controls as
16

specified.

Where communication and/or power wiring is specified to be provided under this Section, p
oint

17

to point routing of communication trunks and power wiring between DDC controllers, DDC
18

communication devices, control panels, and Ethernet switches shall be documented

in the control Record
19

Drawings
.


20


21

All submittals are to comply with submission and co
ntent requirements specified in specification Section
22

01 91 01

or

01 91 02.

23


24

DEMOLITION

25

The consulting engineer should verify and specify in detail what is to be demolished. Special
26

attention should be given to existing temperature control air systems as
to whether it should be
27

demolished or re
-
used.

28

Where existing control devices, piping, or wiring are discontinued from use, remove and turn over to
29

owner. If owner does not want them remove from premises.
Remove any previously abandoned control
30

devices i
n a similar manner.

31


32

DESIGN CRITERIA

33

Size all control apparatus to properly supply and/or operate and control the apparatus served.

34


35

Provide control devices subject to corrosive environments with corrosion protection or construct them so
36

they are suitable
for use in such an environment.

37


38

Provide devices exposed to outside ambient conditions with weather protection or construct them so they
39

are suitable for outdoor installation.

40


41

Use only UL labeled products that comply with NEMA Standards. Electrical compo
nents and installation
42

to meet all requirements of the electrical sections (Division
26
) of project specifications.

43


44

OPERATION AND MAINTENANCE DATA

45

All operations and maintenance data shall comply with the submission and content requirements specified
46

unde
r section GENERAL REQUIREMENTS.

47


48

Delete the following if there are no additional requirements.

49

In addition to the general content specified under GENERAL REQUIREMENTS supply the following
50

additional documentation:

51

1.

Lubrication instructions, including list/f
requency of lubrication

52

2.

List indicating types and grades of oil and/or grease, packing materials, normal and abnormal
53

tolerances for devices, and method of equipment adjustment.

54

3.

Table noting full load power factor, service factor, NEMA design designation,
insulation class and
55

frame type for each motor provided

56

4.

A complete set of record control drawings.

57

5.


[A/E and commissioning provider to define detailed operation and maintenance data
58

requirements for equipment specifications added to this section.]

59


60

Delete this section and specify training under
23 09 23

section if the DDC controls are open bid
61

(not negotiated by
DFD
). The required amount of training will vary with each facility.
62

Videotaping of training must be reviewed for each project. This may not be required or could
63

DFD Project No.

23 09 14
-
5

be reduced. Coordinate this with the owner agency and
DFD

during development of the
1

project.

2


3

MA
TERIAL DELIVERY AND STORAGE

4

Provide factory shipping cartons for each piece of equipment and control device. This contractor is
5

responsible for storage of equipment and materials inside and protected from the weather.

6


7


8

P A R T 2
-

P R O D U C T S

9


10


11

AI
R PIPING

12

ASTM B75 seamless, hard drawn or annealed copper tubing with ANSI B16.22 wrought copper fittings,
13

except final connections to apparatus may be made with brass compression
-
type fittings. Use ANSI/ASTM
14

B32, 95/5 tin antimony solder.

15


16

Virgin polyeth
ylene plastic tubing classified as flame retardant under UL 94 and conforming to ASTM
17

D1693 stress
-
crack test.

18


19

CONTROL AIR SUPPLY

20

Use this only for remodeling projects, additions to existing buildings, or where compressed air is
21

available from a central p
lant. Consultants should indicate the location of existing air mains
22

and the adequacy of compressor capacity to handle remodeling or additions. User agency and
23

DFD

will assist in this determination.

24


25

The need for surge tanks and additional air/oil filter
s and dryers serving instrument air service
26

extension must also be verified with
DFD

and user agency.

27


28

Extend existing air supply for new work.

29


30

AIR COMPRESSORS

31

Use only duplex air compressor assemblies.

32

For applications where more than 20 SCFM air usage

is required rotary vane air compressors
33

can be supplied as an alternative to reciprocating compressors. These compressors will have
34

lower noise and generally less maintenance than large reciprocating units.

35


36

Reciprocating Air Compressors:

37

Compressors ma
y be tank mounted or base mounted with an independent tank. Provide a duplex
38

compressor assembly. Size each compressor to serve the entire control system when operating no more
39

than 1/3 of the time with a maximum of six (6) starts per hour. Each compres
sor to be belt driven with an
40

oil pressure switch on pressure lubricated compressors to automatically shut down the unit on loss of oil
41

pressure. Compressors under 10HP may be splash lubricated, over 10 HP compressor will be pressure
42

lubricated
.
Include f
usible disconnect switches, magnetic starters with three phase overload protection, and
43

an alternator to switch the lead compressor after each run cycle or run both compressors if one cannot
44

handle the load.

45


46

Rotary Vane Air Compressors:

47

Manufacturer: comp
are Hydrovane, Mattei, Pneumofore, or approved equal.

48

Provide two compressors each capable of handling full load requirements. Compressors to be of oil
49

injected rotary vane design with direct flexible coupled motor not exceeding 1750 RPM. Provide after
50

c
ooler radiator, multi
-
stage oil separator, condensate separator, and automatic drain. Include fusible
51

disconnect switches, magnetic starters with three phase overload protection, and an alternator to switch the
52

lead compressor after each run cycle or run
both compressors if one cannot handle the load. Control to be
53

on
-
load/off load pressure activated inlet valve control with timed off load shutdown.

54


55

Steel air storage tanks to be ASME stamped for a pressure 50% higher than the operating pressure of the
56

sy
stem or 150 psig, which ever is greater. Tanks to be provided with an automatic tank drain, and
57

furnished with a relief valve sized in accordance with ASME requirements. Where air storage tanks are
58

installed independently from compressor assembly, provid
e interconnecting piping and wiring.

59


60

Accessory devices to include an intake air filter for
[indoor][outdoor]

installation, air intake silencer to
61

provide attenuation of not less than 35 dB at 2000 Hz, belt guard on each compressor motor
-
drive
62

assembly, re
lief valve, shutoff valves, air storage tank pressure gauge, operating pressure control.

63


64

DFD Project No.

23 09 14
-
6

SURGE TANKS

1

Surge tanks are required for buildings that are supplied by campus air systems that are known
2

to have surging problems. Verify with user agency if surging

is a problem. As a general rule
3

they are not required.

4


5

Steel surge tanks to be ASME stamped for a pressure 50% higher than the operating pressure of the system
6

or 150 psig, which ever is greater. Provide a minimum of a 60 gallon tank with an automatic
tank drain.

7


8

Provide reducing valves where air pressure supplied to surge tank is above pressure required by control
9

devices served. Furnish with an air pressure gauge and safety relief valve mounted on the tank.

10


11

REFRIGERATED AIR DRYERS

12

Do not specify
refrigerated air dryers if desiccated lab air is available. Coordinate with
13

plumbing designer to provide tap for control air after desiccant dryer and capacity increase for
14

control air usage.

15


16

Provide a refrigerated air dryer with pressure regulator, filt
er, moisture separator, bypass valve, automatic
17

drain, and pressure relief valve. Minimum capacity shall be equal to the calculated air quantity with a
18

safety margin of 50%.

Compressor shall be internally isolated

from air dryer frame to prevent vibration
19

transmission.

20


21

Instrumentation to include power on light, failure light, refrigerant suction pressure gauge, and air outlet
22

pressure gauge.

23


24

For applications requiring airflow at or above 25 SCFM, equip dryer with

hot gas bypass to maintain
25

continuous operation and stable dew point of +13°F at 20 psig main pressure.

26


27

Equip with a coalescing filter with a replaceable element with an efficiency rating of 99.999+% for
28

particles .025 microns or larger and a charcoal fi
lter with an efficiency rating of 100% for particles .025
29

microns and larger.

30


31

PRESSURE REDUCING AIR VALVES

32

Provide pressure reducing valves with integral relief and with enough flow capacity to reduce air pressure
33

to that required for control devices.

34


35

CO
NTROL DAMPERS

36

Dampers used for perchloric or high chloride compound applications should be constructed of
37

316 stainless steel. For general fume hood exhaust 304 stainless steel construction is
38

acceptable.

39


40

End switches should be specified for dampers wh
en required to prove the damper open before
41

the fan is allowed to run. These should only be used when fan static can damage ductwork.
42

Where possible interlock directly to fan starter so Hand/Off/Auto switch will activate damper in
43

Hand position
.

44


45

Provide

control dampers shown on the plans and as required to perform the specified functions.

Dampers
46

shall be rated for velocities that will be encountered
at maximum

system design

and rated for pressure
47

equal or greater than the ductwork pressure class
as spe
cified in Section 23 31 00
of the ductwork where
48

the damper is installed
.

49


50

Use only factory fabricated dampers with
mechanically captured
replaceable resilient blade seals, stainless
51

steel jamb seal
s
and with entire assembly suitable for the maximum
temperature and air velocities
52

encountered in the system.

53


54

All dampers in stainless steel
,
PCD coated steel
, PVC, PTFE, or fiberglass

ductwork shall be constructed of
55

stainless steel.

56


57

All dampers in aluminum ductwork shall be constructed of stainless stee
l or aluminum.

58


59

Dampers in galvanized ductwork
shall

be constructed of galvanized steel and/or aluminum.

60


61

All dampers
, unless otherwise specified,

to be rated at
a minimum of 180º F

working temperature
.

Leakage
62

testing shall be certified to be based on
la
test edition of
AMCA Standard 500
-
D

and all dampers, unless
63

otherwise specified, shall
have leakage ratings

as follows:

64

DFD Project No.

23 09 14
-
7




Damper Class

DifferentialPressure

Leakage

1




Class IA


1” w.g.



≤3 CFM/ft
2


2




Class I


4” w.g.



≤8 CFM/ft
2

3

Class I


8” w.g.



≤11

CFM/ft
2

4

Class I


12” w.g.



≤14 CFM/ft
2

5

L
eakage rate

dampers

for differential pressure
s that they will encounter at maximum system design
6

pressures
.

7


8

S
teel framed dampers: Nailor models 2010 & 2020; Greenheck models VCD
-
33 & VCD
-
42
; Johnson

9

Controls mode
l V
-
1330; Ruskin Model
s

CD60
& CD40; other

approved equal.

10


11

A
luminum

frame and blade

dampers: Nailor models
2010EAF & 202EAF; Greenheck model VCD
-
43;
12

Ruskin model CD50; Arrow model AFD
-
20; other approved equal.

13


14

Wherever possible locate outside air and ret
urn dampers directly adjacent to one other and as far
15

upstream of the connection to the AHU as possible to facilitate mixing. Do not use packaged mixing
16

sections on modular AHU’s unless absolutely necessary. Where mixing arrangements are used, show
17

the d
irection of the damper blades directed at each other on the plans.

18


19

Dampers used for
directed
mixing of airstreams
, i.e. outside air and return air,

to be parallel blade type

and
20

sized for
an
air velocity of 1800 to 2000 fpm

with the

damper blades shall be

arranged so that the air
21

streams are directed at one another to facilitate mixing
.

Dampers used for throttling or modulating
22

applications other than air stream mixing to be opposed blade type. Two position dampers may be parallel
23

or opposed blade type.

24


25

D
ampers

used for isolation on the discharge of
centrifugal fans shall have damper blades perpendicular to
26

the fan shaft

to minimize system effect
.

Dampers
mounted with blades vertically
shall be
designed

for
27

vertical blade orientation.

28


29

Dampers for
applications other than fume exhaust to have frames of not less than 16 gauge galvanized steel
30

or 12 gauge extruded aluminum. Blades to be

two
-
ply steel airfoil of

not less than

2 x 20
gauge galvanized
31

steel
(14 ga
uge

equivalent
)

or extruded aluminum airf
oil
, with
stainless steel, acetal, Celcon,
bronze
,

or
32

nylon bearings. Maximum allowable blade width is 8 inches. Use plated steel linkage hardware.

33


34

Dampers used for
laboratory
fume
or general
exhaust systems shall have
not less than 8”
wide x

14
gauge
35

fr
ames and

not less than 16 gauge
two
-
ply

airfoil

blades
.
Laboratory fume exhaust damper f
rames, blades,
36

and axl
e
s to be
constructed of 304 stainless steel.
Laboratory general exhaust damper frames, blades, and
37

axl
e
s to be constructed of galvanized steel.

Dampers shall be
selected

for a
minimum
rating
of 10” water
38

gauge at a velocity of 4000 FPM

and

rated at a minimum of 250º F.
Blade bearings to be constructed of
39

stainless steel or Teflon
. Blade seals to be silicone.

Leakage testing shall be certified
to be based on latest
40

edition of AMCA Standard 500
-
D and laboratory fume exhaust dampers, shall have leakage ratings as
41

follows:

42




Damper Class

DifferentialPressure

Leakage

43




Class I


1” w.g.



≤4 CFM/ft
2


44




Class I


4” w.g.



≤8 CFM/ft
2

45

Class I


8” w.
g.



≤11 CFM/ft
2

46

Class I


12” w.g.



≤14 CFM/ft
2

47


48

L
aboratory fume

and general

exhaust dampers: Ruskin model CD80AF; Greenheck model HCD
-
230; or
49

approved equal.

50


51

Maximum damper width is 48 inches; where required width exceeds 48 inches, use multiple damper

52

s
ections
. Inside frame free area shall be a minimum of 90% of total inside duct area.

53


54

Multiple
width
damper sections shall utilize jack shaft linkages

unless noted below
.

Sections over 144
55

inches wide shall be actuated from two locations

on the jack shaf
t
.
Double width damper sections for two
-
56

position
operation

may be actuated without jack shafts if each damper section is actuated separately.
57

Dampers that have multiple width and multiple vertical sections

shall have a jackshaft for each
vertically
58

stack
ed
set of dampers

and be provided with crossover linkages between jack shafts to transfer uneven
59

loading.


60


61

Jack shafts shall be extended outside of the ductwork for external actuator mounting.

Provide bearings on
62

the point of exit for support of damper
shafts to prevent wear on the shaft and the ductwork.

If locating
63

actuators out of the air stream is impossible, obtain mounting location approval from the designer

unless
64

DFD Project No.

23 09 14
-
8

the contract documents indicate
in
air stream mounting
is
acceptable.

In no cases
shall damper actuators
1

for fume exhaust systems be located in the air stream or require entering the air stream
to
service

an
2

actuator
.

3


4

Provide
weatherproof

NEMA 4

enclosures

(Belimo
N4 option

or equal
, Belimo ZS
-
100 or ZS
-
150 are not
5

acceptable
)
that
have removable covers
that have clasps or machine screws (no sheet

metal screws) and
that
6

do not require removing fasteners from the ductwork

to prevent actuator failure or freeze
-
up when
7

mounting in locations exposed to harsh environments or outdoor locat
ions.

8


9

Size operators for smooth and positive operation of devices served, and with sufficient torque capacity to
10

provide tight shutoff against system temperatures and pressure encountered. For pneumatic actuation, use
11

rolling diaphragm, piston type opera
tors with adjustable stops. For electric modulating actuation, use fully
12

proportional actuators with zero and span adjustments. For two
-
position electric actuation use 24 VAC for
13

DDC controlled actuators, 120 VAC actuators may be used for hardwire interl
ocking.
See 23 09 15 for
14

specific type of input signal required.
Actuator stroke times shall match the requirements of the DDC
15

controllers provided under
23 09
23,
23 09
24, and 23 09 25

and/or the specific system requirements for
16

proper operation. All
electric actuators will be provided with overload protection to prevent motor from
17

damage when stall condition is encountered. Equip operators with spring return
or stored energy fail
-
safe
18

return
for applications involving fire, freeze protection, moistur
e protection or specified normally
19

open/closed operation.

Provide damper end switches with form

C


contacts where control sequences
20

require damper position indication.

End switches shall not contain mercury.

21


22

All power required for electric actuation sh
all be provided by this contractor if it is not able to be
directly
23

provided from the DDC controller.

24


25

Provide operators with linkages and brackets for mounting on device served.

26


27

Provide pilot positioners for pneumatic operators serving all modulating
outside air, return air, relief air
,
28

and
face and bypass

dampers, where more than one operator is controlled in sequence, or where required to
29

provide sufficient power to the operator.

30


31

CONTROL VALVES

32

Provide all control valves as shown on the plans/detai
ls and as required to perform functions specified.
33

Spring ranges must be selected to prevent overlap of operation and simultaneous heating and cooling.

34


35

Size operators to allow smooth and positive operation of devices served and to provide sufficient torq
ue
36

capacity for tight shutoff against system temperatures and pressure encountered. For pneumatic actuated
37

systems, use rolling diaphragm, spring loaded, and piston type operators. For electric modulating
38

actuation, use fully proportional actuators with
0
-
10VDC inputs and zero and span adjustments

unless
39

specified otherwise in the

chart below
.

If TriState with feedback is specified, valve position shall be fed
40

back to the controller and controller
shall

position valve based on this feedback.
For two
-
pos
ition electric
41

actuation use 24 VAC for DDC controlled actuators, 120 VAC actuators may be used for hardwire
42

interlocking. Electric actuators, for applications other than terminal units, shall be provided with a manual
43

override capability.

All electric actuators shall

be

provide
d with

a visible position indica
tor
.

44


45

All power required for electric actuation shall be provided by this contractor if it is not able to be
directly
46

provided from the DDC controller.

47


48

Provide operators that are ful
l proportioning or two
-
position, as required for specified sequence of
49

operation. Provide spring
-
return for applications involving fire, freeze protection, moisture protection or
50

specified normally open/closed operation.

Valves shall move to their fail
positions on loss of electrical
51

power or air pressure to the actuator.

For high pressure (> 20 PSI) full proportioning pneumatic actuators,
52

provide with zero bleed pilot positioners that are integral with the actuator. For high pressure two
-
53

positioning a
ctuators, provide with electro
-
pneumatic solenoid air valve and adjustable bleed orifice
54

integral with the actuator.

55


56

Two
-
position shut
-
off valves shall be sized for a maximum pressure drop of 2 PSI at design flow and shall
57

be a minimum of line size.

58


59

Prov
ide operators with linkages and brackets for mounting on device served.

60


61

All valves unless specifically noted on the plans

or indicated below

shall be globe style valves.

62


63

DFD Project No.

23 09 14
-
9

Choose
one

of the following tables and modify accordingly. The first table is typical for a
1

project with all pneumatic actuation. The second is typical for a project with electric actuated
2

terminal unit

(DDC controlled only)

and pneumatic actuated primary equipmen
t. The third is
3

typical for a project with all electric actuation.


4


5

Consider specifying butterfly valves for modulating water system application where the Cv
6

requirements exceed 160. When reviewing sizing of butterfly valves in these applications keep
7

in mind entering and leaving pipe sizes effects on valve sizing.

8


9

For steam grid humidifiers with manifolds, specify line size steam valves in the steam supply to
10

the humidifier. This should be a normally closed valve that is closed whenever the humidifie
r is
11

locked out.

12


13

If using electric actuated terminal unit valves, do not require normally open or closed valve
14

actions unless critically important. This would require the use of spring return actuators which
15

are larger and more expensive.

16


17

VALVE SERVING

TYPE

Globe

Butterfly (BF)

Ball

Press Independent
Ball (PI Ball)

SIGNAL

2
-
Position
(
24VAC)

Pneumatic

SPRING

RETURN

REQ
UIRED

Yes

/
No

FAIL

POSITION

Open (thru Coil)

Closed

(bypass
Coil)


Reheat Coil

Globe

Pneumatic

Yes

Open

Radiation
/Convector

Globe

Pneumatic

Yes

Open

CUH and UH

Globe

Pneumatic

or 2
-
Pos
Elect

Yes

Open

Fan Coil

Heating

Globe

Pneumatic

Yes

Open

Fan Coil Cooling

Globe

Pneumatic

Yes

Closed

AHU Heating

Coil

Globe

Pneumatic

Yes

Open

AHU Cooling

Coil

Globe or BF
1

Pneumatic

Yes

Closed

Humidifier

Globe

Pneumatic

Yes

Closed

Humidifier Shutoff

Globe

Pneumatic

Yes

Closed

HW Heat Exchanger

Globe

Pneumatic

Yes

Open

Process CHW HX

Globe

Pneumatic

Yes

Open

Process CHW Isolation

BF

Hi Pressure
Pneumatic

Yes

See Flow Diagram

See plan details
, notes,

and schedules for where two
-
way and three
-
way valves should be used.

18

1. Equivalent Cv butterfly valves may be used where 3” and larger globe valves would be required.

19


20


21

VALVE SERVING

TYPE

Globe

Butterfly (BF)

Ball

Press Independent
Ball (PI Ball)

SIGNAL

0
-
10VDC

TriState (24VAC)

2
-
Position Elect

Pneumatic (Pneu)

SPRING

RETURN

REQUIRED

Yes

No

FAIL

POSITION

Open (thru Coil)

Closed (bypass
Coil)

Last Position

Reheat Coil

Globe

or Ball

0
-
10VDC

or
TriState w/Feedback

No

Last Position

Radiation w/Reheat

Globe

or Ball

0
-
10VDC or
TriState

No

Last Position

Standalone Radiation

Globe

Pneumatic

or
TriState

Yes

Open

or Last
Position

CUH and UH

Globe

Pneu or 2
-
Pos

Elect

Yes

Open

Steam Terminal Units

Globe

Pneumatic

Yes

Open

Fan Coil Heating

Globe

Pneumatic

Yes

Open

Fan Coil Cooling

Globe

Pneumatic

Yes

Closed

AHU Heating Coil

Globe

Pneumatic

Yes

Open

AHU Cooling Coil

Globe or BF
1

Pneumatic

Yes

Closed

Humidifier

Globe

Pneumatic

Yes

Closed

Humidifier Shutoff

Globe

Pneumatic

Yes

Closed

HW Heat Exchanger

Globe

Pneumatic

Yes

Open

DFD Project No.

23 09 14
-
10

Process CHW HX

Globe

Pneumatic

Yes

Open

Process CHW Isolation

BF

Hi Pressure
Pneumatic

Yes

See Flow Diagram

See plan details
, notes,
and schedules for where two
-
way and three
-
way valves should be used.

1

1. Equivalent Cv

butterfly valves may be used where 3” and larger globe valves would be required.

2


3


4

VALVE SERVING

TYPE

Globe

Butterfly (BF)

Ball

Press Independent
Ball (PI Ball)

SIGNAL

0
-
10 VDC

TriState (24VAC)

2
-
Position Elect

Pneumatic (Pneu)

SPRING

RETURN

REQUIRED

Yes

No

FAIL

POSITION

Open (thru Coil)

Closed (bypass
Coil)

Last Position

Reheat Coil

Globe or Ball

0
-
10 VDC

or
TriState w/feedback

No

Last Position

Radiation w/Reheat

Globe or Ball

0
-
10 VDC or
TriState

No

Last Position

Standalone Radiation

Globe or Ball

0
-
10 VDC

No

Last Position

CUH and UH

Globe or Ball

TriState or 2
-
Pos
Elect

Yes

Open

Steam Terminal Units

Globe

0
-
10 VDC

No

Last Position

Fan Coil Heating

Globe or Ball

0
-
10 VDC

No

Last Position

Fan Coil Cooling

Globe or Ball

0
-
10 VDC

No

Last Position

AHU Heating Coil

Globe

0
-
10 VDC

Yes

Open

AHU Cooling Coil

Globe or BF
1

0
-
10 VDC

Yes

Closed

Humidifier

Globe

0
-
10 VDC

Yes

Closed

Humidifier Shutoff

Globe

2
-
Pos Elect

Yes

Closed

HW Heat Exchanger

Globe

0
-
10 VDC

Yes

Open

Process CHW HX

Globe

0
-
10 VDC

Yes

Open

Process CHW Isolation

Butterfly

2
-
Pos Elect

Yes

See Flow Diagram

See plan details
, notes,

and schedules for where two
-
way and three
-
way valves should be used.

5

1. Equivalent Cv

butterfly valves may be used where 3” and larger globe valves would be required.

6


7

WATER SYSTEMS:

8

Use equal percentage valves for two
-
way control valves; size for a pressure drop not less than 4 psi or more
9

than 6 psi.

Note: For low flows, the required mi
nimum Cv size will result in lower pressure drop than 4
10

psi.

11


12

Use three
-
way valves sized for a maximum pressure drop of 5 psi and that have linear characteristics so
13

that the valve pressure drop remains constant regardless of the valve position.

14


15

Globe val
ves 2" and smaller:
Cast

b
ronze
or
forged

brass
body, brass plug and
brass or stainless steel
seat,
16

stainless steel stem, screwed ends, suitable for use on water systems at 150 psig and 240° F.


Seat leakage
17

with actuator supplied will meet ANSI class IV
leakage (0.01%).

For globe valves that are specified to fail
18

in place, valves shall be open when the stem is up.
Only the following

globe valve

body
s
tyles

will be
19

acceptable for terminal unit control: Siemens
Powermite

599
VF
Series

(599
VE
Series Zone

Valves are
20

not acceptable)
, Invensys VB72
00

Series, Johnson Controls VG7000 Series
,
and Honeywell

V5011
/V5013
21

Series
.

Minimum size for globe valves
shall
be 1.5 Cv.

22


23

Globe valves 2 1/2" and larger: Iron body, brass plug and seat, stainless steel stem,
spring loaded Teflon, or
24

EPDM packing, flanged ends, suitable for use on water systems at 150 psig and 240° F.

25


26

Butterfly valves: Iron body, stainless steel shaft, bronze bearings, and resilient seat. Disc to be aluminum
-
27

bronze, nickel
-
plated ductile iron
, cast iron with welded nickel edge,
Nylon 11 coated,
or stainless steel.
28

Valve assembly to be bubble tight, suitable for use on water systems at 150 psig and 240° F. For
29

pneumatically actuated valves, provide pilot positioners on all operators for butte
rfly valves used in
30

modulating applications.

When butterfly valves are used in modulating applications, entering and leaving
31

pipe sizes
and required transition distances
shall be detailed on the control valve submittals. The control
32

contractor shall be r
esponsible for coordinating the proper pipe sizes and transitions with the mechanical
33

contractor to provide the correct Cv at 70° open position.

34


35

Characterized Ball
Valves:
The following manufacturers are acceptable: Honeywell, Belimo, Johnson
36

Controls, KM
C Controls, Yamatake
, Bray
. For use on terminal units only where specified above. Forged
37

DFD Project No.

23 09 14
-
11

brass or bronze body,
stainless steel shaft and ball
, reinforced Teflon or
PTFE ball

seals, double O
-
ring
1

stem seals,
characterized
disk,
maximum of ANSI Class IV (0
.01%) leakage, suitable for use on water
2

systems at 150 psig and 212° F.

Minimum size for ball valves shall be 1.0 Cv.

3


4

Pressure Independent Characterized Ball Valves: The following manufacturers and models are acceptable:
5

Belimo model PICCV and Griswold
Controls PIC
-
V.


For use on terminal units only where specified
6

above. Forged brass or bronze body
, reinforced

Teflon or
PTFE ball

seals, double O
-
ring stem seals,
7

characterized disk, maximum of ANSI Class IV (0.01%) leakage, suitable for use on water sys
tems at 150
8

psig and 212° F.


Flow shall be varied by actuator position and at any give
n

position
,

flow through the
9

valve shall not vary more that +/
-

5% due to system pressure fluctuations across the valve in the selected
10

operating range. Valves shall be

pressure independent between a system differential pressure of 8 and 50
11

PSI
D
.

Minimum size for ball valves shall be 1.0 Cv.

12


13

STEAM SYSTEMS (15 psig and less):

14

Use equal percentage valves that have a minimum rangeability of 30 to 1. Size for a pressure d
rop equal to
15

80% of the inlet steam gauge pressure.

For integral face and bypass coils, size steam valves for
a pressure
16

drop that will provide an
inlet pressure
recommended

by coil manufacturer

for freeze protection
.

Typically
17

this is 5 PSI for single
tube and 2 PSI for inner distributing tube types.

Seat leakage with actuator supplied
18

will meet ANSI class III leakage (0.1%) or better.

19


20

2" and smaller: Bronze body, cage trim, brass or stainless steel plug and seat, stainless steel stem, screwed
21

ends, s
uitable for 35 psig saturated steam (281°F).

Only the following globe valve body styles will be
22

acceptable for terminal unit control: Siemens
Powermite

599 VF Series (599 VE Series Zone Valves are
23

not acceptable), Invensys VB7200 Series, Johnson Controls VG7000 Series, Honeywell V5011/V5013
24

Series.

25


26

2
-
1/2" and larger: Iron body, brass or stainless steel plug and seat, stainless steel stem, flanged ends,
27

suitable for suitable for 35 psig saturated steam (281°F).

28


29

Design pressure and temperature ratings for steam valves will vary with the degree of superheat
30

available in the system. For systems served from a central heating plant, verify specific
31

requireme
nts with
DFD
. See section
23 05 23
for temperature and pressure requirements.

32


33

STEAM SYSTEMS (over 15 psig to 100 psig saturated steam):

34

Use equal percentage valves. Size for a pressure drop equal to 45% of the absolute inlet pressure.

Seat
35

leakage with
actuator supplied will meet ANSI class III leakage (0.1%) or better.

36


37

2" and smaller: Bronze body, cage trim, bronze plug and seat, stainless steel stem, screwed ends, suitable
38

for 100 psig steam at 338°F.

39


40

2
-
1/2" and larger: Iron body, bronze plug, stainl
ess steel stem and seat, flanged ends, suitable for 100 psig
41

steam at 338°F.

42


43

STEAM SYSTEMS (over 100 psig and superheated)

44

Contact
DFD

to verify class and materials for valves on systems with steam pressures above 100
45

psig and for systems which may have superheated steam.

46



47

CONTROL SYSTEM INSTRUMENTATION

48

Manufacturers:
Averaging Type
-

Johnson Controls
, or equal
; Bulb Type
-

Johnson Cont
rols, Ashcroft,
49

Marshall, Weksler


50


51

DUCT THERMOMETERS:

52

3

inch or larger

dial type with swivel mount. Maximum scale graduations of 2°F.
Thermometers in
ducts
53

above
6 square feet to have averaging

type, liquid or gas filled capillary sensing

elements a min
imum of 6
54

feet and supported across the width of the duct
.

Thermometer temperature range shall not be more than
55

twice the expected temperature range at installed location.

56


57

PIPE THERMOMETERS:

58

9 inch stem type with an adjustable swivel mount. Scale gradu
ations of 2°F and mid
-
range accuracy of
59

±1°F. Install thermometers in separable brass wells filled with conductive fluid.

Thermometer temperature
60

range shall not be more than twice the expected temperature range at installed location.

61


62

REMOTE BULB THERMO
METERS:

63

DFD Project No.

23 09 14
-
12

3 inch
or larger
dial type with recalibration screw on face. Accuracy within 1% of scale range.
1

Thermometers with sensing elements in air ducts with an area of above
6
square feet to have averaging

2

liquid or gas filled capillary sensing

elements.

Provide separable wells for all pipeline applications.

3

Thermometer temperature range shall not be more than twice the expected temperature range at installed
4

location.

5


6

Show locations on the plans where thermostat guards are required and where heavy duty

7

guards should be provided.

8


9

THERMOSTAT GUARDS

10

Provide

clear plastic locking covers keyed the same. For
locations

that are subject to
physical
abuse,
11

provide cast aluminum guard, Johnson Controls GRD10A
-
601 or equal.

12


13

ELECTRIC
/ELECTRONIC

THERMOSTATS

14

ELECTRIC
THERMOSTATS:

15

For single setpoint applications, provide
line or low voltage
electric type
suitable for heating or heating and
16

cooling as required.
Provide the required number of heating and/or cooling stages required for the
17

application.

For li
ne voltage ventilation applications utilizing fans and where otherwise specified in the
18

sequence of operations, provide an integral manual On/Off/Auto selector switch.

Minimum contact rating
19

shall be equal to electrical load of device being controlled.

20


21

LOW VOLTAGE ELECTRONIC THERMOSTATS:

22

Manufacturers: Honeywell, Johnson Controls, Viconics, or equal.

23

W
here unoccupied setpoints are specified, provide electronic programmable type with seven day
24

setup/setback scheduling with a minimum of two occupied and un
occupied schedules per day through
25

keypad entry on front of unit. For heating and cooling applications, provide automatic heating/cooling
26

switchover.

For applications that control fans, provide fan override switch. For ventilation or packaged
27

economizer
applications provide a dry contact for ventilation damper or economizer

initiation
. For
28

thermostat control of
economizer, provide a

0
-
10VDC

modulated output for economizer damper control.

29

For applications that require integration to the building automatio
n system, provide a BACnet
30

communication interface.

If a communication interface is specified, occupancy scheduling in the
31

thermostat is not required.

32


33

Only use pneumatic low limit thermostats for pneumatic only systems. For DDC control with
34

pneumatic or

electric actuation use electric low limit thermostats.

35


36

LOW LIMIT THERMOSTATS (freezestats):

37

Electric two
-
position type with temperature sensing element and manual reset

for all applications except
38

integral face and bypass steam heating coils which shall
have auto
-
reset freezestats and latching relays (see
39

execution section for details)
. Unit to be capable of opening control circuit if any one
-
foot length of
40

sensing element is subject to a temperature below the setpoint. Length of sensing element to be n
ot less
41

than one lineal foot per square foot of coil surface areas. Unless otherwise indicated, set low limit controls
42

at 36°F.

43


44

AQUASTATS:

45

Line voltage type with single pole,
double
throw switch of adequate rating for the applied load.

46


47

REMOTE BULB THERM
OSTATS:

48

Line voltage type with single pole, double throw switch of adequate rating for the applied load. Thermostat
49

to have adjustable setpoint suitable for controlled load.

50


51

IMMERSION TYPE THERMOSTAT SENSORS:

52

Rod and tube type with linear output. Provid
e separable wells with heat conductive fluid for installation in
53

pipeline. Units shall be factory calibrated.

54


55

FIRESTATS:

56

UL labeled, manual reset, line voltage type with 135°F setpoint.

57


58

PNEUMATIC THERMOSTATS

59

Provide insulated subbase for all thermostats installed on outside walls or walls exposed to outside air
60

temperatures. Subbase to provide a minimum of one half inch of insulation.

61


62

PNEUMATIC SINGLE TEMPERATURE ROOM THERMOSTATS:

63

DFD Project No.

23 09 14
-
13

Two
-
pipe, non
-
bleed,
proportioning relay type with adjustable throttling range, lockable but adjustable
1

stops, and test plug for calibration. Furnish with concealed adjustment on a brushed aluminum or brushed
2

nickel cover

3


4

Thermostats used for both heating and cooling contro
l are to have separate sensing elements, an adjustable
5

deadband of 2°F to 10°F, and minimum setpoint range of 60°F to 90°F.

6


7

Use direct or reverse acting thermostats to match device being controlled.

8


9

PNEUMATIC DUAL TEMPERATURE ROOM THERMOSTATS:

10

Use dual t
emperature type thermostats in spaces with an occupied/unoccupied cycle of operation. Dual
11

temperature thermostats shall have two sets of temperature sensing elements; one for occupied operation
12

and one for unoccupied operation. Initiate changeover centr
ally by a change in control air supply pressure.
13

Provide manual reset to permit return to normal temperatures during unoccupied cycles. Units shall reset to
14

normal during the next cycle of operation. Furnish with concealed adjustment on a brushed alumin
um or
15

brushed nickel cover

16


17

ASPIRATING THERMOSTATS:

18

Similar to pneumatic room thermostats except flush mounted in an insulated wall box with cover plate.
19

Positively induce room air over the sensing elements by the same compressed air supply as used with
the
20

thermostat. Secure cover plate with vandal
-
proof screws. Furnish with concealed adjustment on a brushed
21

aluminum or brushed nickel cover.

22


23

LOW LIMIT THERMOSTATS (freezestats):

24

Two
-
position pneumatic type with temperature sensing element and manual res
et. Unit to be capable of
25

opening control circuit if any one
-
foot length of sensing element is subject to a temperature below the
26

setpoint. Length of sensing element to be not less than one lineal foot per square foot of coil surface areas.
27

Unless other
wise indicated, set low limit controls at 36°F.

28


29

REMOTE BULB THERMOSTATS:

30

One or two
-
pipe, proportioning, direct or reverse acting to match device being controlled. Thermostat to
31

have adjustable setpoint and throttling range. Capillary to remote bulb sha
ll be armored.

32


33

DUCT THERMOSTATS:

34

Pneumatic, one or two
-
pipe proportioning type, with adjustable setpoint and throttling range. Units shall be
35

direct or reverse acting to match device being controlled. Sensing element to be averaging type,
36

temperature co
mpensated, armored, with minimum length of 8 feet.

37


38

PNEUMATIC HUMIDISTATS

39

ROOM HUMIDISTATS:

40

Wall mounted, proportioning type, with adjustable 2% RH throttling range, 30% to 80% RH operating
41

range at temperatures to 110°F, and cover with setpoint indication
. Cover shall match room thermostat.

42


43

DUCT HUMIDISTATS:

44

Insertion type, fully proportioning, adjustable 2% RH throttling range, and operating range from 20% to
45

80% RH at temperatures to 150°F. Minimum length of sampling tube to be 12 inches.

46


47

Require

pneumatic high limit humidistats for DDC systems with pneumatic actuation.

48


49

HIGH LIMIT HUMIDISTAT:

50

Two position, reverse acting, insertion type, with setpoint adjustable in 2% RH increments.

51


52

The following two sections are for pneumatic control systems on
ly, remove if control system is
53

DDC with electric or pneumatic actuation.

54


55

RECEIVER CONTROLLERS

56

Pneumatic controllers to be high capacity type, fully adjustable, direct or reverse acting, 2
-
pipe non
-
bleed
57

design, with adjustable proportional band. Capable

of accepting 1 or 2 transmitter inputs with a separate
58

third input port for local or remote control point adjustment. Provide direct reading scales to match range
59

on input devices or separate adjustment switches with calibrated dials.

60


61

PNEUMATIC TRANSMIT
TERS

62

BUILDING STATIC PRESSURE TRANSMITTERS:

63

DFD Project No.

23 09 14
-
14

One pipe, direct acting, double bell, differential type with temperature compensation, scale range 0.01 to
1

1.0 inch w.g. positive or negative, and sensitivity of 0.0005 inch w.g. Transmit pneumatic signal to
2

rec
eiver with matched scale range.

3


4

PRESSURE TRANSMITTERS:

5

One pipe, direct acting, indicating type, with range suitable for system, and proportional pneumatic output
6

as required.

7


8

TEMPERATURE TRANSMITTERS:

9

One pipe, with linearity within 1/2 percent of range

for 200°F span and one percent of range for 50°F span
10

and equipped with a compensated bulb, averaging capillary, or rod and tube sensing element. Range to be
11

suitable for system. Pneumatic output signal to be directly proportional to measured variable.

12


13

HUMIDITY TRANSMITTERS:

14

One pipe, with linearity within ±1% for a 70 percent relative humidity span, capable of withstanding 95
15

percent relative humidity without loss of calibration. Pneumatic output signal directly proportional to
16

measured variable.

17


18

PNEU
MATIC SYSTEMS ACCESSORIES

19

PILOT POSITIONERS:

20

Adjustable start point (2
-
12 psig) and span (5
-
13 psig), equipped with brackets for mounting on operator.

21


22

PRESSURE GAUGES FOR PROCESS VARIABLE INDICATION:

23

Manufacturer's standard, black letters on white
background, 2_1/2 inch diameter, flush or surface mounted,
24

with front calibration screw, suitable dial range calibrated to match sensor, in appropriate units.

25


26

INSTRUMENT PRESSURE GAUGES:

27

Manufacturer's standard, black letters on white background, 1_1/2 in
ch diameter, and stem mounted with
28

suitable dial range.

29


30

RELAYS:

31

For summing, reversing, amplifying, high or low
-
pressure selection, with fixed 1:1 [or adjustable]
32

input/output ratio.

33


34

SWITCHES:

35

With indicating plates, accessible adjustment, calibrated, an
d marked.

36


37

Include the following DDC sensors, transmitters, and transducers when using this specification
38

with a Direct Digital Control specification.

39


40

DUCT SMOKE DETECTOR AND FIRE ALARM INTERFACE MODULES

41

Coordinate with Division
28
to provide duct detecto
rs or fire alarm control modules for air
42

handling unit and exhaust system shutdown and smoke control inputs to the DDC system. In
43

most cases fire alarm control modules will be the most effective and flexible way of achieving
44

this interface. Ensure that t
he logic matrix for the fire alarm devices to trigger a HVAC
45

response is clearly specified.

46


47

Duct smoke detectors and

fire alarm control modules
shall
be provided by others. Provide wiring, conduit,
48

and necessary interface with fire alarm system to perfo
rm specified sequence of operation.

49


50

AIR FLOW STATIONS

51

For duct mounted airflow stations, design ductwork in such a way that there is adequate
52

straight runs to provide for accurate air flow measurement (a minimum of 10 duct diameters
53

upstream and 5 duct
diameters downstream
-

more if possible) and with minimum velocities
54

above 700 FPM

for air stream other than outside air
.
Minimum outside air velocities should be
55

above 200 FPM.
If any of these criteria cannot be met, consult with
DFD



the AE will be hel
d
56

responsible for designs that result in misapplication of air flow measurement. Velocities below
57

this speed are very difficult to measure and will likely result in inaccurate readings.

58


59

Fan
piezometers are preferred over fan
inlet probes

and should b
e specified to come with the
60

fans where air flow measurement is required for control. Fan inlet probes

are acceptable
but
61

should be avoided on small fans because of access for mounting and system effect on fan
62

performance
.

63


64

DFD Project No.

23 09 14
-
15

All dampers should be located

downstream of the airflow station. Provide for access doors up
1

and downstream of all duct mounted air flow stations for maintenance purposes.
Show all air
2

flow stations on plans and indicate if they are duct
, piezometer,
or fan inlet type.
Schedule
3

maximum and
minimum airflow on plans and specifications for all air systems that have
4

airflow stations

so the contractor has the information to determine flow station type and
5

pressure transducer allowed
.

6


7


8

Provide
duct mounted
airflow station type based o
n the following minimum design velocities.
Pitot or
9

thermal dispersion flow stations can be used for fan inlet flow stations.
Outside air flow stations shall be
10

thermal dispersion type only.
Turndown of variable volume fan systems must be considered. P
rovide an
11

airflow station schedule detailing the airflow range to be measured, corresponding velocity pressure,
12

differential pressure transducer range, and the airflow station size.

13


14

Air Velocit
y


Duct Mounted
Air Flow Station Type

15

0
-
700 FPM


Thermal Dispe
rsion

16

>700 FPM


Thermal Dispersion or Multi
-
probe velocity pressure

pitot style

17


18

Duct mounted Multi
-
probe velocity pressure pitot air flow stations:

19

Multi
-
probe duct velocity pressure sensing station constructed of minimum 16 gauge galvanized steel
20

casing,

and multiple metallic velocity pressure sensors with automatic averaging manifold. For duct
21

installations, provide an aluminum honeycomb cell air straightener with maximum openings of ½” and
22

minimum of 3” depth. Each airflow measuring element shall contai
n multiple Total and Static pressure
23

sensors, placed at equal distances (for rectangular Ducts) and at concentric area centers (for circular ducts)
24

along the element length. The number of sensors on each element and the quantity of elements utilized at
25

ea
ch installation shall comply with the ASHRAE standards for duct traversing. The airflow measuring
26

elements shall be capable of producing steady, non
-
pulsating Total and Static pressure signals, with
27

accuracy within

2% of actual flow. Airflow resistance t
o be less than or equal to 0.23 inches of water at
28

4000 feet per minute air velocity.

29


30

Fan inlet probe air flow stations:

31

For fan inlet probes provide two probes for each fan inlet (for DWDI fans provide four probes). Pressure
32

drop caused by the airflow e
lements shall not exceed 0.03” w.c. at 2000 FPM. Airflow elements shall be
33

provided with all necessary pivot mounting hardware and signal connection fittings for connection to
34

tubing provided by the installing contractor.
For pitot type
air flow stations
, the s
tatic and total pressure
35

manifold piping by the installing contractor shall be piped symmetrically so take
-
off will be located where
36

line lengths between all probes are equal in length.

37


38

Fan inlet piezometers:

39

Where fan inlet piezometers are provid
ed, these shall be used by the control contractor for air flow
40

measurement. The the air velocity transducers shall be provided under this Section and sized as described
41

below.

42


43

For duct mounted and fan inlet pitot flow stations

or factory mounted piezomet
ers
, a
ir velocity transducers
44

range
shall
be sized less than two times the design velocity pressure at maximum flow and will meet the
45

requirements under the PRESSURE TRANSDUCERS (AIR)

specification later in this specification section
46

unless noted below.

47


48

Thermal dispersion air flow stations
:

49

Manufacturers: Ebtron,

Air Monitor,


Kurz Instruments
, or equal
.

50


51

Probe Sensor Density:

52

Area (sq. ft.)


Sensors

53

<= 1
.5



2

54

>1
.5

to <4


4

55

4 to <8



6

56

8 to <12



8

57

12 to <16


12

58

>=16



15

59


60

Airflow Sensor Accuracy:

2% o
f reading

61

Calibrated Range: 0
-
2500
FPM

for duct applications and 5000 FPM for fan inlet applications

62

Temperature Sensor Accuracy:

0.15

F

63

Temperature:
-
20

F to +140

F

64

DFD Project No.

23 09 14
-
16

Relative Humidity: 0 to
95
% (non
-
condensing)

1


2

Provide transmitter that will average up to
sixteen sensors and provide two field selectable linear analog
3

output
signal
s (4
-
20mA and 0
-
10 VDC) proportional to airflow and temperature.

Sensor electronic
4

circuitry other than the temperature sensors shall n
ot be exposed to the air stream and shall be protected
5

from moisture

to prevent failure
.

6


7

WATER FLOW MEASUREMENT

8

For use in campus and central plant chilled water and hot water flow measurement
9

applications. Flow sensor provides analog outputs for flow ra
te for connection to the central
10

control system. These would typically be used for total building flow measurement. Use one of
11

the two specifications listed below for the flow meter and then choose the other options
listed
12

after the flow meter specificati
ons
as required for the application.

13


14

This

specification is for electromagnetic flow measurement and allows both

a “hot tap” style
15

flow sensor

or a flanged full bore flow sensor.
Use electromagnetic flow
measurement systems
16

for all projects unless lower cost is desired.
The insertion flow sensor

can be installed and
17

serviced without system shutdown.
Electromagnetic insertion flow sensors cannot provide bi
-
18

directional flow readings. If bi
-
direction flow m
easurement is required, a full bore or insertion
19

turbine flow sensor will be required.
All accuracy statements must be complete including a
20

percentage of reading accuracy over a stated velocity range. Provide schedule on drawings.

21


22

Manufacturers: Onicon
Inc., Emerson Rosemount, Yokogawa., or approved equal.

23

Provide an Electromagnetic Flow Meter complete with integral electronics module. The flow meter shall
24

be
either a full bore flanged meter or insertion style meter
installed in either the supply or return pipe of the
25

system to be measured following the manufacturer’s
installation
instructions. Full bore style flow meters
26

shall be installed via flanges

matching the ANSI class (
150
, 300)

required for the application.


The
27

installing contractor is responsible for providing suitable mating flanges. For installations in non
-
metallic
28

pipe, install grounding rings between flanges. Insertion style flow meters shall be installed through a 1” full
29

port ball valve to enable i
nsertion and removal of the meter without system shutdown. Insertion flow
30

meters shall be hand
-
insertable up to 400 psi.

31


32

The manufacturer shall provide a certificate of NIST traceable wet
-
calibration for each
flow meter
.
33

Accuracy shall be as follows:

34

±

1% of reading over a 10:1 turndown (from
2

to
2
0 ft/s)

35

Overall rangeability shall be from 0.
25

ft/s to
2
0 ft/s (
80
:1 turndown ratio).

36


37

The
flow meter

shall have a maximum operating pressure of 400 PSI, maximum operating temperature of
38

200
0

F (optional 300
0

F peak) and a pressure drop of less than 1 PSI at 17 feet per second flow velocity.

39


40

The
flow meter

shall have a minimum of one analog output, 0
-
10 VDC or 4
-
20 mA for connection to the
41

BAS for liquid flow rate

and a scalable dry contact output for total
ization

unless the
flow meter

is
42

connected to a BTU measurement system that will provide this output or be directly integrated to the BAS.
43

The
flow meter

shall also include integral frequency output for diagnostic purposes and for connection to
44

local disp
lay. All outputs shall be linear with flow rate.

45


46

Local display of flow rate to be provided in a steel NEMA 4

remote

wall mounted enclosure with internal
47

terminal strip connections and shall be powered by 24 VAC or VDC and provide necessary power to flow
48

meter.

49


50


51

The following paragraph

along with one of the two following paragraphs

for BTU
52

measurement is for use on buildings that will be required to pay for utility services

or to monitor
53

energy usage
. If in question, contact
DFD

to see if this will be a
requirement.

54


55

Provide a BTU Measurement System that shall consist of a

flow sensor, two temperature sensors, a BTU
56

meter, thermowells and all required mechanical installation hardware. The BTU meter shall include a front
57

panel mounted display for BTU total, liquid flow rate, supply temperature and return temperature. The
58

met
er shall be supplied by 24VAC or 24VDC to provide power to the BTU meter electronics, flow meter,
59

and temperature sensors.

60


61

DFD Project No.

23 09 14
-
17

Use the following paragraph for discrete point connections (hardwired) to a BAS controller.

If this
1

paragraph is used, delete the following paragraph.

2


3

The BTU
Measurement System
shall provide a solid state dry contact switch output corresponding to total
4

thermal energy transfer, and 4
-
20 mA or 0
-
10 VDC analog outputs for supply temperature, ret
urn
5

temperature, and liquid flow rate. Temperature sensors shall be calibrated and matched for the specific
6

temperature range for each application. The calculated differential temperature used in the energy
7

calculation shall be accurate to within
+

0.15
0
F

(including the error from individual temperature sensors,
8

sensor matching, input offsets, signal conditioning, and calculations).

9


10

Use the following paragraph for connection to a BAS
using

a
n

integrated
communication interface
.

If
11

this paragraph is used
and flow is not required in a process control loop, delete the preceding paragraph.

12


13

The BTU
measurement system
shall provide a BACnet MSTP RS
-
485
communication interface

that will
14

provide
information corresponding

to total thermal energy transfer, supply
temperature, return temperature,
15

and liquid flow rate.
For meters that do not have integral BACnet communications, provide a separate
16

gateway device that will provide a BACnet MSTP communication interface. All programming of the
17

gateway device shall be pr
ovided by this contractor.
Temperature sensors shall be calibrated and matched
18

for the specific temperature range for each application. The calculated differential temperature used in the
19

energy calculation shall be accurate to within
+

0.15
0
F (including
the error from individual temperature
20

sensors, sensor matching, input offsets, signal conditioning, and calculations).

When DDC PI control loops
21

are specified in 23 09 93 that use flow or temperatures from the flow meter and BTU measurement system,
22

provid
e a
compatible
discrete hardwired output to the DDC controller that is doing the control loop in
23

addition to the information provide through the communication interface.

24


25

STEAM FLOW MEASUREMENT

26

For use in a campus or central plant steam measurement applica
tions. Determine if a “hot tap”
27

insertion style flow meter or flanged type flow meter should be installed based on the amount of
28

turndown required and the physical space available (insertion style meters require large
29

amounts of head room for extraction).

The insertion style meters can be installed and serviced
30

without system shutdown and this criterion should be considered for the application. Try to
31

locate the flow device in the low
-
pressure steam line if possible. If there is insufficient room to
32

ins
tall this device based on the layout shown on the drawings, investigate the use of
33

straightening vanes. It is the responsibility of the A/E to arrange sufficient space to install the
34

flow sensing devices so they are capable of performing their intended ta
sk in an accurate
35

manner. If large turndown is required, specify the ratio and investigate the device required to
36

meet the application. Provide schedule including measurement flow range on drawings. Show
37

the location of the steam meter on the plans and
indicate the pipe size reduction required to
38

produce velocities to provide accurate readings over the widest range possible for the meter
39

specified. If superheated steam is to be measured, a temperature and pressure must be provided
40

and

a BTU Measurement
System specified. If only saturated steam is to be measured, a
41

temperature
or

pressure sensor must be provided.

42


43

Manufacturers: Engineering Measurements Co., J
-
Tec Assoc., The Foxboro co., or approved equal.

44


45

Provide a vortex shedding technology flow sens
or. [The sensor assembly shall be an insertion type that can
46

be inserted or removed from the pipeline without process line shutdown. Provide all mechanical accessories
47

necessary for insertion and removal without shutdown and coordinate with mechanical con
tractor for hot
48

tap style installation.] [The sensor assembly shall be a flanged type.

Provide the information required for
49

the mechanical contractor to provide a flanged spool piece (specified under Section 23 05 15) that can
50

directly replace the meter i
f the meter needs to be removed for service.] For high
-
pressure applications
51

flanged fittings may be required for pressure rating. Sensor to be rated for 250 psig and 400
o
F

(increase in
52

superheated steam)

process and 150
o
F ambient. Provide with 316 stainless steel body, quartz
53

piezoelectric or ultrasonic flow element, with an integrally mounted weatherproof head enclosure. Provide
54

a pressure [and/or] temperature sensor with the meter package, unless provided with a separ
ate BTU
55

Measurement System, for determining density in the meter BTU calculation. Unit shall be powered by
56

24VAC or 24VDC with a 4
-
20 mA output signal linear to flow and a pulse output for BTU totalization
57

applications. The overall accuracy to be within 1
.5% of the actual flow throughout the scheduled range.
58

Provide a local display for flow and a method for programming of the flow sensor (see Execution Section
59

for mounting requirements).

60


61

The following paragraph for BTU measurement is for use on buildings

that will be required to
62

pay for utility services. If in question, contact
DFD

to see if this will be a requirement
. If
63

superheated steam is not being measured, delete the requirement for the temperature sensor.

64

DFD Project No.

23 09 14
-
18


1

Manufacturers: Kessler
-
Ellis Products,
Foxboro, Preso.

2

Provide a BTU Measurement System which shall consist of a mass flow computer, pressure sensor, and
3

temperature sensor that will calculate the mass steam flow using the ASME steam tables for both saturated
4

and super heated steam. The mass c
omputer will be compatible with the steam flow meter specified above.
5

Provide a pressure transmitter as specified in this section suitable for steam applications. Computer will
6

provide 4
-
20 mA output signals for flow and pressure and a scalable pulse out
put for totalized flow.
If
7

steam flow meter can provide an integral BTU Measurement system, this is an acceptable equivalent
.

See
8

Execution Section for mounting requirements.

9


10

TIME CLOCKS

11

Time clocks should only be used where direct digital control or a
central building automation
12

system is not available for start/stop control, or where use a DDC systems cannot be
13

economically justified. Consult with
DFD

prior to use of mechanical time clocks.

14


15

UL listed, digital, 7
-
day, minimum of 10 on/off programs per

day, holiday programming, automatic
16

daylight savings switchover, and minimum of seven
-
day battery back
-
up.

17


18

TEMPERATURE CONTROL PANELS

19

Constructed of steel or extruded aluminum, with hinged door, keyed lock, and baked enamel finish. Install
20

controls, r
elays, transducers and automatic switches inside panels. Label devices with permanent printed
21

labels and provide asbuilt wiring/piping diagram within enclosure. Provide raceways for wiring and poly
22

within panel for neat appearance. Provide termination b
locks

for all wiring terminations
.
Label
outside of
23

panel with panel number corresponding to
plan tags and
asbuilt control drawings

as well as

building
24

system(s) served.

25


26

Control panels that have devices or terminations that are fed or switch 50V or highe
r shall enclose the
27

devices, terminations, and wiring so that Personal Protective Equipment (PPE) is not required to service the
28

under 50V devices and terminations within the control panel. As an alternative, a separate panel for only
29

the 50V and higher d
evices may be provided and mounted adjacent to the under 50V control panel.

30


31

For panels that have 120VAC power feeds provide a resettable circuit breaker. Provide label within the
32

panel indicating circuit number of 120VAC serving panel

33


34

Include the follow
ing paragraph for DDC only. Include a service shutdown binary input for all
35

air handling unit systems in the DDC point chart.

36


37

Provide a service shutdown toggle switch for each air handling unit system located inside the temperature
38

control panel that wil
l initiate a logical shutdown of the air handling unit system. Label the switch so it is
39

clear which position is shutdown and which is auto.

40


41

Include the following paragraph for pneumatic control only.

42


43

Manual switches including damper "minimum
-
off" positi
oning switches, "summer
-
winter switches",
44

"manual
-
automatic switches", dial thermometers, pressure gauges, and receiver indicating gauges shall be
45

flush mounted in front door of panel. Clearly identify each item with engraved nameplates.

46


47

TEMPERATURE
SENSORS

48

Thermistor temperature sensor manufacturers: PreCon, BAPI, and ACI

49


50

Use thermistor or RTD type temperature sensing elements constructed so accuracy and life expectancy is
51

not affected by moisture, physical vibration, or other conditions that exist
in each application.

52

RTD’s shall be of nickel or platinum construction and have a base resistance of 1000


at 70

F and 77

F
53

respectively. 100


platinum RTD’s are acceptable if used with temperature transmitters.

54


55

The temperature sensing device used must

be compatible with the DDC controllers used on the project.

56


57

RTD

58


Accuracy
(
Room

Sensor Only
)



minimum
+

1
.
0

F

59

Accuracy (Averaging)




minimum
+

1.2

F

60

Accuracy (Other than Room Sensor or Averaging)

minimum
+

0.65

F

61


Range






minimum
-
40
-

220

F

62


63

Ther
mistor

64

DFD Project No.

23 09 14
-
19


Accuracy (All)





minimum
+

0.36

F

1

Range






minimum
-
30
-

230

F

2

Heat Dissipation Constant





minimum 2.7 mW/°C

3


4

Temperature Transmitter

5


Accuracy





minimum
+

0.1

F or
+
0.2% of span

6


Output






4
-
20 mA

7


8

Provide limited range or extended range

sensors if required to sense the range expected for a respective
9

point. Use RTD type sensors for extended ranges beyond
-
30 to 230

F. If RTD’s are incompatible with
10

DDC controller direct temperature input use temperature transmitters in conjunction with

RTD’s.

11


12

Use wire size appropriate to limit temperature offset due to wire resistance to 1.0

F. If offset is greater than
13

1.0

F due to wire resistance, use temperature transmitter. If feature is available in DDC controller,
14

compensate for wire resistance

in software input definition.

15



16

T
erminal unit
space
sensors

shall be
furnished under Section 23 09 23, 23 09 24, or 23 09 25
.

Terminal
17

unit discharge temperature sensors shall be provided under this Section.

18


19

Use averaging elements on duct sensors when
the ductwork is
ten
square feet or larger.

All mixed air and
20

heating coil discharge sensors shall have averaging elements regardless of duct size.

21


22

In piping systems use temperature sensors with separable wells designed to be used with temperature
23

element.

24


25

HUMIDITY SENSORS

26

When designing for a close tolerance room, select a humidity sensor with a minimum accuracy
27

of 1%.

28


29

Use

capacitive

thin
-
film

polymer
sensor

types

with a range of 0
-
100% RH. Accuracy to be no less than
30

[

2%]

in the range of 20%

RH to 80% RH with a response time of 120 seconds or less.

Provide covers for
31

room humidity sensors
as specified for

temperature sensor
s
.

32


33

For outside air applications, use sensor designed for outside air use along with weather enclosure
. Provide
34

sensor
e
qual to Vaisala Model HMD60UO w/
DTR503B
enclosure

and
weather resistant

mounting
35

hardware
.

36


37


38

PRESSURE TRANSDUCERS (AIR)

39

Provide pressure transducers specified below for the following applications:

40



D
uct static pressure
applications where setpoints are spe
cified to control at greater than 0.1” w.
c
.

41



P
itot type fan inlet
air flow station
s.

42


43

Manufacturers: Mamac Systems, Setra, and Veris Industries.

44

Provide a transmitter that operates on the capacitance principle and is capable of sensing low positive,
45

negative or differential pressures. Transmitter shall have a minimum of three pressure ranges adjustable by
46

an onboard switch or jumper. Size the tra
nsmitter where the middle or high range is suitable for the
47

application. Use a bi
-
directional transmitter for applications that may have both positive and negative
48

pressure excursions. Transmitter shall be provided with an integral four
-
digit display of t
he pressure
49

sensed.

50


51


Accuracy (including non
-
linearity and hysteresis)

+

1% FS

52


Compensated Temperature Range



32

-
140


F

53


Temperature Effect




0
-
1”wc Range .09% FS/

F;

54






>1”wc Range .02% FS/

F



55


Output




4
-
20 MA

56


Load Impedance (smallest maxim
um acceptable)

800


max.

57


Operating Temperature




32

-
140


F

58


59

Provide pressure transducers specified below for the following applications:

60



D
uct static pressure

applications where

setpoints
are
specified
to control at

0.1” w.c.
or lower
.

61



A
ll duct mounted

pitot type air flow stations
.

62



S
pace
/building
static
control or monitoring.


63


64

DFD Project No.

23 09 14
-
20

Manufacturers: Paragon Controls MicroTrans, Air Monitor Veltron DPT2500 Plus, or approved equal.

1

The airflow transducer shall provide noise filtration and automatic auto
-
zeroing.

The automatic zeroing
2

circuit shall be capable of maintaining the transducer output to within

0.
25
% of
operating span
. The
3

transducer output shall be locked and maintained at the last given output value during the automatic zeroing
4

period so as not to
interrupt the automatic control process. Use a bi
-
directional transmitter for applications
5

that may have both positive and negative pressure excursions. Transmitter shall be provided with an
6

integral four
-
digit display of the pressure sensed.

7


8

Transducer
Span: <2 times the design velocity pressure at maximum flow, single range

9

Accuracy:

0.25% of full scale, including non
-
linearity, hysteresis, deadband, and non
-
repeatability

10

Temperature Effect:

0.15% of full scale/

F

11

Response: 0.5 sec. for 98% of full
span change

12

Overpressure: 5 PSIG Proof

13

Power: 24VAC/VDC

14

Analog Output: 0
-
5VDC, 0
-
10VDC, or 4
-
20mA field adjustable

15

Auto Zero Frequency: every 1 to 24 hours on 1 hour intervals

16


17

For space or building static pressure monitoring, use Vaisala model SPH10 Stati
c Pressure Head, or
18

approved equal for outside air reference. Mount in location shown on plans or approved by AE.

19



20

PRESSURE TRANSDUCERS (LIQUID/STEAM)


21

Show locations of all pressure sensors and differential pressure sensors and gauges on the plans
and
22

s
how

sensors along
with gauges

on details.

23


24

Provide a transmitter that utilizes capacitive or thin film strain gauge sensing.
Provide

for
an analog gauge
25

piped in parallel with the transducer.
Gauge shall meet specifications as specified in Section 23 05

15.
26

Coordinate with mechanical contractor to provide and install this gauge.

For differential pressure
27

applications provide with bypass valve manifold assembly with valved venting capability.

28


29


Accuracy (including non
-
linearity and hysteresis)

+

0.5% FS

30


Compensated Temperature Range



32

-
150


F

31


Temperature Effect (over compensated range)

0.03%/

F;

32


Output




4
-
20 MA

33


Load Impedance (smallest maximum acceptable)

600


Minimum

34


Operating Temperature




0

-
175


F

35


Hysteresis




0.75% of span




36



37

Specify

current sensors for most status point applications. Where direct measurement of the process
38

medium is deemed critical to indicate system status, specify differential pressure switches.


39


40

DIFFERENTIAL PRESSURE SWITCHES

41

Differential pressure switches shall

sense both inlet and outlet of fans and pumps. Device shall be rated for
42

150% of maximum system pressures that may be encountered. Provide with pressure differential that will
43

be required to meet specified operation and/or to prevent nuisance “toggling”

of the device in the system
44

served.

45


46

AIR
PRESSURE SAFETY SWITCHES

47

Air p
ressure safety switches shall
be a differential pressure switch that will
sense
differential,
negative
,

or
48

positive pressure as required by
the sequence of operation specification
.

Device shall be rated for
a
49

minimum of
150% of maximum system pressures that may be encountered. Provide with pressure range
50

that will be required to meet specified operation in the system served.
Provide with a normally closed
51

contact that will open a
bove setpoint and will not close until the manual reset button is depressed. Setpoint
52

shall be manually adjustable.

53


54

CURRENT STATUS SWITCHES

55

Provide a current sensor with adjustable threshold and digital output with LED display, equal to a Veris
56

model H
-
708/H
-
904. Threshold adjustment must be by a multi
-
turn potentiometer or set by multiprocessor
57

that will automatically compensate for frequency and amperage changes associated with variable frequency
58

drives. When used on variable speed motor application
s, use a current sensor that will not change state due
59

to varying speeds.


60


61

ELECTRIC TO PNEUMATIC TRANSDUCERS

62

DFD Project No.

23 09 14
-
21

Electric to pressure transducers shall have internal pressure feedback to compare actual commanded
1

pressure value and will compensate for leakage

or drift. Provide with manual override.

Output of
2

transducer shall bleed to zero PSI on power fail.

3


4


High air capacity

500 SCIM at 20 psig

5


Low air consumption

15 SCIM at 20 psig

6


Input

4
-
20 MA / 0
-
10VDC

7


Output

0
-
20 psig

8


Linearity

1% of span

9


Hyster
esis

1% of span

10


11

This contractor shall be responsible for verifying that the i
nput of electric to pneumatic transducers
is

12

compatible with the output of the DDC controller provided under
23 09 24

or
23 09 23
.

13


14

CARBON DIOXIDE (CO2) SENSOR

15

Provide a Carbon
Dioxide (CO
2
) sensor that shall utilize non
-
dispersive infrared (NDIR) technology. The
16

sensor shall have a linear analog output over a range of 0
-
2000 ppm and have built in display of CO
2

level.
17

The sensor shall have an automatic calibration algorithm th
at will compensate for sensor drift over time due
18

to sensor element degradation. Unit shall be provided with a 0
-
10VDC or 4
-
20mA analog output that is
19

selectable and a field adjustable relay alarm output. Accuracy shall be
better

than

5% of reading or
20


50ppm whichever is higher. The sensor shall be user calibratible with a minimum calibration interval of
21

five years.

22


23

CONDENSATION MONITORS

24

Provide condensation monitors to be strapped to CW piping that will have a contact switch in the event an

25

RH greate
r than 90% is sensed. Unit shall operate with a supply voltage of 24 Vac and be coated to protect

26

against dust and contamination. Use capacitive thin
-
film polymer sensor types with a setpoint of 90% RH

27

+/
-

3%. LED indication of relay status.

28

Provide senso
r equal to Elektronik Model EE46 w/ mounting hardware.

29


30

FUME HOOD PRESENCE SENSORS:

31

Manufacturers: Pepperl & Fuchs Proscan/38a or approved alternate.

32


33

Infrared sensor shall be mounted to top/front of fume hood to indicate presence of individual in front of

34

fume hood. Provide swivel mounting bracket and all mounting hardware.

35


36

Minimum Detection Field: 72” x 3”

37

Switch Open Time: 3 min/10 s, programmable

38

Light type: Infrared, modulated light

39

Function display: LED red: on for object detection

40

Operating elements
: Programmable switch for switching type, open time, detection field

41

Operating voltage: 12
-
38 V DC / 12
-
28 V AC

42

Signal output: Relay

43


44

All power supplies and transformers for temperature control equipment should be provided by this
45

contractor. Do not speci
fy power supplies or transformers for temperature control equipment under
46

Division 26.

47


48

POWER SUPPLIES

49

Provide all required power supplies for transducers, sensors, transmitters and relays. All low voltage
50

transformers shall have a resettable secondary
circuit breaker

and be listed as class 2 power supplies.

51


52


53

P A R T 3
-

E X E C U T I O N

54


55

INSTALLATION

56

Install system with trained mechanics and electricians employed by the control equipment manufacturer or
57

an authorized representative of the
manufacturer. Where installing contractor is an authorized
58

representative of the control manufacturer, such authorization shall have been in effect for a period of no
59

less than three years.

60

DFD Project No.

23 09 14
-
22


1

Install all control equipment, accessories, wiring, and piping i
n a neat and workmanlike manner. All control
2

devices must be installed in accessible locations.

This contractor shall verify that all control devices
3

furnished under this Section are functional and operating the mechanical equipment as specified
in

Section

4

23 09 93.

5


6

Include the following paragraph only when working with DDC Control System that is not part
7

of the bid and negotiated by the State utilizing section 23 09 24. Contact
DFD

engineering
8

personnel if there are questions.

9


10

All cables to the electron
ic input/output devices, sensors, relays and interlocking wiring (all of which shall
11

be supplied and installed under this section of specification) interfaced with the Direct Digital Control
12

System shall be extended into the 23 09 24 DDC panel with a minim
um of 5 ft. of cable to allow for
13

termination by the 23 09 24 DDC Contractor. This contractor shall provide a technician to inspect and
14

validate all tubing, wiring, and field devices associated with the DDC interface in coordination with and
15

under directio
n of the 23 09 24 DDC Contractor to ensure that each device is operating per the control
16

sequences as specified in Section 23 09 93.

17


18

Label all control devices with the exception of dampers, valves, and terminal unit devices with permanent
19

printed labels t
hat correspond to control drawings.

Temperature control junction and pullboxes shall be
20

identified utilizing spray painted green covers. Other electrical sy
s
tem identification shall follow the 26 05
21

53 specification.

22


23

All control devices and electrical b
oxes mounted on insulated ductwork shall be mounted over the
24

insulation. Provide mounting stand
-
offs where necessary for adequate support. Cutting and removal of
25

insulation to mount devices directly on ductwork is not acceptable. This contractor shall c
oordinate with
26

the insulation contractor to provide for continuous insulation of ductwork.

27


28

Mounting of electrical or electronic devices shall be protected from w
eather

if the building is not
29

completely enclosed. This Contractor shall be solely responsibl
e for replacing any equipment that is
30

damaged by water that infiltrates the building if equipment is installed prior to the building being enclosed.

31


32

Provide all electrical relays and wiring, line and low voltage, for control systems, devices and component
s.
33

Install all high voltage and low voltage wiring (includes low voltage cable) in metal conduit
,

Electrical
34

Non
-
metallic Tubing (ENT), or Electrical Metallic Tubing (
EMT
)
,

as scheduled below

and hereafter
35

referred to generically as conduit. See Wire and

Air Piping Conduit Installation Schedule below for
36

specific conduit or tubing to be used
.


All conduit must be installed in accordance with electrical sections
37

(Division
26
) of this specification and the National Electrical code.

38


39

Conduit
shall
be a
minimum of 1/2 " for low voltage control provided the pipe fill does not exceed 40%.

40


41

Minimum low voltage wiring gauge to be 18 AWG for outputs and 20 AWG for inputs. All low voltage
42

wiring to be stranded.

43


44

Low voltage wiring can be run without conduit ab
ove accessible lay
-
in tile ceilings. All wiring in
45

mechanical rooms, above inaccessible hard ceilings, exterior locations, and in any exposed areas, and in all
46

other locations should be in conduit. Wire for wall sensors must be run in conduit. Wiring for

radiation
47

valves shall be run in conduit where routed through walls.

48


49

Where wiring is installed free
-
air, installation shall consider the following:

50


51



Wiring shall utilize the cable tray wherever possible.

52


53



Wiring shall run at right angles and be kept clea
r of other trades work.

54


55



Wiring shall be supported utilizing "J" or "Bridal
-
type"
steel
mounting rings anchored to ceiling
56

concrete, piping supports
, walls above ceiling

or structural steel beams.

Mounting rings shall be of
57

open design (not a closed loop)

to allow additional wire to be strung without being threaded through
58

the ring
.
For mounting rings that do not completely surround the wire, attach the wire to the mounting
59

ring with a strap.

60


61



Supports shall be spaced at a maximum 4
-
foot interval unless l
imited by building construction. If
62

wiring "sag" at mid
-
span exceeds 6
-
inches; another support shall be used.

63


64

DFD Project No.

23 09 14
-
23



Wiring shall never be laid directly on the ceiling grid or attached in any manner to the ceiling grid
1

wires.

2


3



Wall penetrations shall be
sleeved.

4


5

Wiring shall not be attached to existing cabling, existing tubing, plumbing or steam piping, ductwork,
6

ceiling supports or electrical or communications conduit.

7


8

The A/E must properly coordinate the necessary power wiring with Division
26
. Ensure

that
9

emergency power is supplied to DDC panels that serve equipment that is fed by emergency
10

power.

11


12

Control panels serving equipment fed by emergency power shall also be served by emergency power. This
13

contractor shall be responsible for all 120VAC powe
r, not provided in the Division
26
specifications,
14

required for equipment provided under this section. Power shown for temperature control panels on plans
15

may be utilized by the
23 09 24

and/or
23 09 23
, and
23 09 14

contractors.

16


17

Provide communication tr
unk wiring to integrated devices (i.e. VFD’s, Flow Meters, Chillers,
Lighting
18

Panels, Electrical Meters,
etc.)
and terminal unit controllers
that are specified to be connected to the
19

building automation system. Communication trunk wiring shall be as requi
red by the equipment specified
20

under the
23 09
23, 23 09 24,
or
23 09
25
Sections and shall be routed to the DDC panel designated for that
21

equipment as shown on the plans or the closest DDC panel if not designated. If communication trunks
22

require daisy ch
ained style wiring, pro
vide two communication cables

to the DDC panel so that the
23

communication trunk is not dead ended
.

24


25

Install all terminal unit
DDC
controls

and associated sensors

furnished under Section 23 09 23, 23 09 24, or
26

23 09 25. This contracto
r shall provide all 24VAC power transformers and wiring for DDC terminal unit
27

controls. This contractor shall provide all communication wiring to the DDC supervisory controller
28

provided under 23 09 23, 23 09 24, or 23 09 25
. Provide all power and communi
cation wiring type and
29

installation as required by the DDC controller manufacturer
. This contractor shall terminate wiring for all
30

terminal unit controllers and perform end to end point checkout of all inputs and outputs to the terminal
31

unit controllers.

This contractor shall verify the communication trunk and controller addressing.

32


33

Delete the following paragraph if Section 23 09 24 is not used.

34


35

If terminal units are furnished under Section 23 09 24, the 23 09 24 contractor shall provide a laptop or
36

ot
her too
l
s and training to the 23 09 14 contractor on how to perform the communication trunk testing and
37

end to end point checkout as described above.

Terminal unit room schedules are to be provided under this
38

Section and supplied to the 23 09 24 contracto
r.
The 23 09 24 contractor shall provide engineered control
39

drawings for installation of the terminal unit controllers and deliver these to the 23 09 14 contractor in time
40

to meet the project schedule for the installation of these terminals.


41



42

Install "
hand/off/auto" selector switches on systems where automatic interlock controls are specified and
43

"hand/off/auto" selector switches are not supplied with the equipment controlled. Control panel power will
44

not be required for “hand” switch to operate. When

switch is in "hand" position, allow manual operation of
45

the selected device without operating the interlocked motors but allowing all unit safety devices to stay in
46

the circuit.

47


48

All wiring in control panels shall be terminated on a terminal strip. Wire
nuts are not acceptable. A
49

maximum of two wires shall be terminated under any one terminal.

50


51

All pneumatic tubing and electrical wiring are to be permanently tagged or labeled within one inch of
52

terminal strip with a numbering system to correspond with th
e "Record Drawings".

53


54

After completion of installation, test and adjust control equipment. Submit data showing set points and
55

final adjustments of controls.

56


57

Do not delete air piping specification for electrically actuated DDC systems if there is static
or
58

differential pressure measurement devices being used.

59


60

AIR PIPING

61

Conceal piping whenever possible. Exposed piping may be run only in mechanical rooms, storage rooms,
62

or other areas where mechanical systems piping is exposed.

63


64

DFD Project No.

23 09 14
-
24

Mechanically attach tubin
g to supporting surfaces. Sleeve through concrete surfaces in minimum one
-
inch
1

sleeves, extended 6 inches above floors and one inch below bottom surface of slabs. Fire stop any open
2

space in the sleeve after the air piping is installed if the sleeve is i
n a fire rated surface.

3


4

Isolate air supply from compressor assembly with wire braid reinforced rubber hose or polyethylene tubing.

5


6

Take
-
offs shall enter top of main air piping wherever possible. Install a shut
-
off valve at each PRV
7

connection to high
-
pre
ssure air main.

8


9

Purge tubing with dry, oil free compressed air before connecting control instruments.

10


11

Install all polyethylene tubing in
conduit as scheduled below

unless specified otherwise hereafter. Exposed
12

polyethylene tubing not exceeding 18 inches
may be used for connection to an instrument or operator
13

without being installed in conduit. All Conduit to be independently supported, all boxes must be supported,
14

all conduit ends to have bushings for protection of tubing.

15


16

Conduit
shall
be a minimum of
1/2 " for poly tubing provided the pipe fill does not exceed 40%.

17


18

Minimum poly tubing size allowed is ¼” OD.

If an instrument has a barbed fitting that will only accept
19

5/32” tubing, connection to the device can be made with 5/32” tubing that is as short

as is practical.
20

Couplings are acceptable in this instance.

21


22

Install all exposed piping and conduit parallel to or at right angles to the building structure and support
23

adequately at uniform intervals. Use only tool made bends in copper air pipe.

24


25

Tubing must be installed and supported in a manner as specified for exposed locations and acceptable to
26

DFD
.

27


28

Where polyethylene tubing is installed free
-
air, installation shall consider the following:

29


30



Tubing shall run at right angles and be kept clear
of other trades work.

31


32



Tubing shall be supported utilizing "J
-
" or "Bridal
-
type" mounting rings anchored to ceiling concrete,
33

piping supports or structural steel beams. Rings shall be designed to maintain tubing bend to larger
34

than the minimum bend radius

(typically 4 x tubing diameter).

35


36



Supports shall be spaced at a maximum 4
-
foot interval unless limited by building construction. If
37

tubing "sag" at mid
-
span exceeds 6
-
inches, another support shall be used.

38


39



Tubing shall never be laid directly on the ceil
ing grid or attached in any manner to the ceiling grid
40

wires.

41


42

Tubing shall not be attached to existing cabling, existing tubing, plumbing or steam piping, ductwork,
43

ceiling supports or electrical or communications conduit.

44


45

Tubing connected to air termina
l unit devices shall be attached to the terminal unit device to prevent tubing
46

from becoming kinked or becoming disconnected. Tubing serving air terminals may be routed on top of
47

ductwork serving that terminal unit for a maximum distance of eight feet.

48


49

T
ubing directly connected to steam valve actuators shall be copper tubing for a minimum of six inches.

50


51

Where tubing is connected to ductwork at an exterior location for sensing purposes, the tubing shall be
52

sloped to a heated interior location without sags

or traps in the tubing to prevent condensation to be trapped
53

in the tubing and prevent accurate sensing. Install drip leg at low point at interior location and note
54

location on control record drawings.

55


56

Number code all polyethylene tubing and install nea
tly with no concealed splices.

57


58

Test entire piping system by pressurizing it to 20 psig for 24 hours. Pressure drop during this period shall
59

not exceed 3 pounds.

60


61

Low
-
pressure air mains shall be designed so that the pressure at any point in the main shall

not vary by
62

more than 1 PSI from the pressure at the air pressure regulator.

63


64

DFD Project No.

23 09 14
-
25

Piping material used shall be as follows:

1


2

Use hard copper tubing for all main air lines, above 30 psi.

3


4

All exposed copper to be hard drawn.

5


6

Use
only
polyethylene tubing inside panels.

7


8

In concealed locations (other than
noted below
) hard copper, soft copper, or polyethylene tubing in
conduit
9

shall

be used.

10


11

Polyethylene tubing in block
,

stud
.
or concrete walls must be in conduit

a
nd associated boxe
s to be of steel.

12


13

W
here air piping is
within concrete slab

or under
grade

use only polyethylene tubing in conduit

14


15

For exposed outdoor locations, use hard copper or polyethylene tubing in conduit.

16


17

Polyethylene tubing may be used in exposed areas if run
in a fully enclosed rigid metal raceway or metal
18

conduit and ambient temperature is less than
150
°F.

19


20

Use copper tubing, where subject to temperatures in excess of
150
°F or where adjacent to heating pipes
21

passing through a common sleeve.

22


23

When
polyethylene

tubing is used above accessible lay
-
in acoustical panel ceilings it must be
fire resistance
24


FR


rated

pass the UL 94 vertical flame test with a rating of V2, be rated as self extinguishing under
25

ASTM D 635
, and may be run without conduit.

26



27

High pressu
re rated polyethylene tubing
in conduit
may be used for branch lines to high
-
pressure actuators.
28

Compression fittings must be used for high
-
pressure

(above 30 PSI)

applications.

29



30

For pneumatic actuated dampers that are involved in a smoke control system, all air piping shall be hard
31

copper, except within control panels and shall be isolated from the non
-
smoke control system controls by
32

automatic isolation valves in the event of a s
moke control event. Installation shall conform
to

applicable
33

International Building Code
Section
909 requirements.

34


35

WIRE AND AIR PIPING
CONDUIT
AND TUBING
INSTALLATION
SCHEDULE

36

The following conduit schedule shall apply to both polyethylene tubing and wir
e in conduit
where conduit
37

is specified for

air

tubing or wiring
.

Conduit and tubing referenced below shall meet specifications in
38

Section 26 05 33 and as
defined

below
.

39


40

Conduit other than that specified below for specific applications shall not be used.

41


42

Underground Installations
within

Five Feet (1.5 m) of Foundation Wall: Rigid steel conduit.

43


44

Underground Installations More than Five Feet (1.5 m) From Foundation Wall: Rigid steel conduit. Plastic
-
45

coated rigid steel conduit. Schedule 40 PVC conduit.

46


47

U
nder Slab on Grade Installations: Schedule 40 PVC conduit.

48


49

Exposed Outdoor Locations: Rigid steel conduit.

50


51

Concealed in Concrete and Block Walls:
Rigid steel conduit.
Schedule 40 PVC conduit.
Electrical
52

Nonmetallic Tubing (
ENT).

53


54

Check with structural e
ngineer whether conduit within slab permitted.

55

Within Concrete Slab:
Rigid steel conduit.
Schedule 40 PVC conduit.
Electrical Nonmetallic Tubing
56

(
ENT).

57


58

In the following paragraph, Schedule 40 PVC may only be used for special
59

applications such as location
s with corrosive atmospheres.

60

Wet Interior Locations: Rigid steel conduit. [Schedule 40 PVC conduit][PVC coated rigid steel conduit].

61


62

Concealed Dry Interior Locations: Rigid steel conduit. Intermediate metal conduit. Electrical metallic
63

tubing.

64

DFD Project No.

23 09 14
-
26


1

Exposed
Dry Interior Locations: Rigid steel conduit. Intermediate metal conduit. Electrical metallic tubing.

2


3

AIR COMPRESSORS

4

Install air compressor assembly on concrete foundation with sole plates and vibration isolators where
5

indicated on drawings. See section

23 05 48
for vibration isolation requirements.

Level, grout, and bolt in
6

place. Pipe automatic condensate drain from air storage tank to nearest floor drain; use copper drain line.
7

Install replaceable cartridge type filter
-
silencer for each compressor;

install upstream and downstream
8

shutoff valves and bypass valve to facilitate cartridge change.

9


10

Install line size ball valve and check valve on compressor discharge when remote tanks are used.

11


12

Where water
-
cooled aftercoolers are used, install a shut
-
off

valve in water supply piping to aftercooler.
13

Pipe copper drain from aftercooler to nearest floor drain.

14


15

REFRIGERATED AIR DRYERS

16

Locate refrigerated air dryer in discharge air line from tank. Mount dryer
where shown on plans
. Install
17

pressure regulator

downstream of dryer. Pipe automatic drain to nearest floor drain; use copper drain line.
18

Install valved bypass around air dryer and around filter assembly.

19


20

CONTROL AND SMOKE DAMPERS

21

All control dampers furnished by the control manufacturer are to be in
stalled by the Mechanical Contractor
22

under the coordinating control and supervision of the Control Contractor in locations shown on plans or
23

where required to provide specified sequence of control.

24


25

Coordinate installation with the sheetmetal installer to
obtain smooth duct transitions where damper size is
26

different than duct size. Blank off plates will not be accepted.

27


28

Each operator shall serve a maximum damper area of 36 square feet. Where larger dampers are used,
29

provide multiple operators.

30


31

CONTROL V
ALVES

32

All temperature control valves furnished by the control manufacturer are to be installed by the Mechanical
33

Contractor under the coordinating control and supervision of the Control Contractor in locations shown on
34

plans or where required to provide sp
ecified sequence of control.

35


36

Steam valve actuators shall be mounted at a 45 degree angle from upright vertical to prevent overheating of
37

the actuator.

38


39

Provide pilot positioners on all valves where more than one pneumatic operator is controlled in
sequence,
40

for all valves 3” and larger, or where required to provide sufficient power. Where two or more valves are
41

operated in sequence, pilot positioners to have adjustable start point (2
-
12 psig) and span (5
-
13 psig).

42


43

CONTROL SYSTEM INSTRUMENTATION

44

For

pneumatically actuated systems install pressure gauges as follows: for indication of supply air pressure
45

in each temperature control panel; at the output of pneumatic/electric transducers; the output of each
46

pneumatic controller; the output of each soleno
id air valve; the input of each PE switch; at each modulated
47

damper and valve except terminal devices; other points where the visible indication of air pressure is
48

required for operating and maintenance purposes. On dampers and valves with pilot positione
rs, locate
49

gauge in the output of positioner to controlled device. Mount gauges so they are visible when looking at
50

the monitored device. At each receiver controller input port, install a 1
-
1/2" diameter dial indicator with
51

scale to match input range (in
degrees F., % R.H., in. w.c., etc.). Equip control air output line with a 1
-
1/2"
52

diameter air pressure gauge.

53


54

Install thermometers at each point of temperature transmission (sensors) and control, except reheat coils,
55

unless the drawings indicate a thermo
meter is to be installed by the piping or sheetmetal installer. Install
56

thermometers to permit easy reading from the floor or operating platform. Provide remote mounting or
57

swiveled mounting as required for easy reading. Flush mounting where not easily
read is not acceptable.

58


59

ROOM THERMOSTATS AND TEMPERATURE SENSORS

60

Consultant must list the locations where each type of thermostat should be used in the project.
61

Overlay plans to check for conflicts with casework and other wall mounted devices before
62

loca
ting thermostat locations on plans. Mounting heights should be scheduled or noted on the
63

plans if multiple heights are required. A height of 60 inches above the floor is standard for
64

DFD Project No.

23 09 14
-
27

non
-
adjustable
sensors, 70 inches for
non
-
adjustable sensors in
locations where systems
1

furniture is located, and 48 inches or other ADA required height when adjustable thermostats
2

or adjustable sensor devices are used.

Any thermostat or sensor that has adjustment even if
3

concealed or under a locked cover must be moun
ted at ADA required height.

4


5

Check and verify location of thermostats, humidistats, and other exposed control sensors with plans and
6

room details before installation. Locate room thermostats and sensors [____] inches above floor. Align
7

with light switche
s and humidistats. For drywall installations, thermostat mounting shall use a back
-
box
8

attached to a wall stud, drywall anchors are not acceptable.

9


10

Any room thermostats or sensors mounted on an exterior wall shall be mounted on a thermally insulated
11

sub
-
base. Subbase to provide a minimum of one half inch of insulation.

12


13

Where thermostats or sensors are mounted on exterior walls or in any location where air transfer will affect
14

the measured temperature or humidity seal the conduit and any other opening tha
t will effect the
15

measurement.

16


17

Provide guards on thermostats

and sensors

in entrance hallways, other public areas, or in locations where
18

thermostat is subject to physical damage.

19


20

LOW LIMIT THERMOSTATS (Freezestats)

21

Install low limit controls where indica
ted on the drawings or as specified. Unless otherwise indicated,
22

install sensing element on the downstream side of heating coils.

23


24

Mount units using flanges and element holders. Provide duct collars or bushings where sensing capillary
25

passes through shee
tmetal housings or ductwork; seal this penetration to eliminate air leakage. Mount the
26

units in an accessible location as to allow for resetting after low limit trips while still meeting
27

manufacturer's installation requirements for proper function.

28


29

Distr
ibute (serpentine) sensing element horizontally across the coil to cover every square foot of coil; on
30

larger coils this may require more than one instrument. Install controls at accessible location with
31

mounting brackets and element duct collars where re
quired.

32

Integral Face and Bypass Steam Heating Coil Freezestats:

33

For integral face and bypass coils the elements are to be run vertically on the face of the heating coil inside
34

the damper enclosure, this will require drilling the frame to run element
around the by
-
pass.

Provide an
35

auto
-
reset freezestat for each coil vertical heating tube. The head of the freezestat shall be mounted

outside
36

the unit, if possible,

above the coils and any excess capillary shall be mounted out of the air stream above
37

the

coil.
If the head of the freezestat cannot be mounted outside of the unit, it should be mounted
38

downstream of the coil.
Provide latching relays with LED indicator of relay status for each freezestat so
39

that the relay will remain latched after the freeze
stat resets. Label each freezestat and corresponding relay
40

to provide an easy method to determine which freezestat(s) have tripped. Provide a momentary reset
41

switch and connection for remote contact reset from the DDC system for resetting the freezestat
alarm.
42

The relays shall be unlatched after a power fail.

Mount latching relays in a hinged cover panel mounted at
43

a maximum of five feet above the floor in an accessible location on the AHU. Reset switch shall be
44

mounted on the cover and be labeled “Fre
ezestat Reset”.

45


46

AIR FLOW STATIONS

47

Install airflow stations in accordance with manufacturer's recommendations. Install straightening vanes
48

upstream of unit where required per manufacturers recommendations.

49


50

LIQUID AND STEAM FLOW SENSORS

51

Install where indic
ated on the drawings and details for flow sensing in hydronic and/or steam piping
52

systems. Do not install close to elbows, valves, or other piping specialties, which might affect the reading
53

of the sensor; follow manufacturer's installation instructions.

Where flow meters are located
more than

five
54

feet

above the floor

or where they cannot be read due to equipment location, provide remote mounting of
55

the flow meter display

and programming controls
. Location

of remote mounted display

shall be so that the
56

f
low measurement display
shall be mounted four to five feet above finished floor
. BTU Measurement
57

System displays shall be located so that the display and programming
controls are four to five feet above
58

finished floor
.

59


60

PRESSURE TRANSDUCERS
AND HIGH LIMIT

PRESSURE SWITCHES

61

Install capped tees in air piping at air pressure transducers for connection of calibration equipment.
Capped
62

tee shall consist of two inch poly tubing capped with a brass plug. Rubber caps are not acceptable.
Install
63

Petes Plugs fitti
ngs at each take
-
off from main piping for liquid pressure transducers for connection of
64

DFD Project No.

23 09 14
-
28

calibration equipment.

Install differential pressure transducers for

filter monitoring at the filter section of
1

the air handling unless otherwise specified. All other

differential or static pressure transducers
and
2

differential or static pressure high limit switches
for air applications should be mounted in the temperature
3

control panel serving the equipment being
controlled or monitored
. All devices mounted on equipm
ent
4

shall be mounted in a location that is at a maximum of five feet above the floor.

For steam and liquid
5

applications, provide shutoff valves at piping takeoff points.

6


7

TEMPERATURE CONTROL PANELS

8

Mount control panels adjacent to associated equipment on vibration
-
free walls or freestanding angle iron
9

supports.
All control panel openings shall be plugged. Conduits and other penetrations on the top of the
10

cabinets shall be sealed on the exterior of
the cabinet with silicone caulk to resist water penetration.
One
11

cabinet may accommodate more than one system in same equipment room. Provide permanent printed
12

labeling for instruments and controls inside cabinet and engraved plastic nameplates on cabine
t face.

13


14

Provide as
-
built control drawings of all systems served by each local panel in a location adjacent to or
15

inside of panel cover. Provide a protective cover or envelope for drawings.

16


17

DIFFERENTIAL PRESSURE SWITCHES

18

Provide for each fan or pump spec
ified, or shown on point list. Provide shutoff valves at piping takeoff
19

points. Readjust pressure and/or differential setpoints for proper operation after final balancing is
20

completed.

21


22

CURRENT STATUS SWITCHES

23

Provide for each fan or pump specified, or s
hown on point list. Set threshold adjustment to indicate belt or
24

coupling loss. Readjust threshold for proper operation after final balancing is completed.

Use the variable
25

frequency drive (VFD) integrated relay output for motor status
,

if provided on t
he VFD
,

in lieu of a discrete
26

current switch. A separate current switch provided under this Section shall be wired in parallel with the
27

VFD motor status relay when a bypass starter is provided on the VFD to prove motor status in the bypass
28

mode.

29


30

CONSTRUC
TION VERIFICATION

31

Contractor is responsible for utilizing the construction verification checklists supplied under specification
32

Section 23 08 00 in accordance with the procedures defined for construction verification in Section 01 91
33

01 or 01 91 02.

34


35

AGENCY TRAINING

36

All training provided for agency shall comply with the format, general content requirements and
37

submission guidelines specified under Section 01 91 01

or

01 91 02.

38


39

Delete the paragraph below and specify training hours under 23 09 23 sectio
n if the DDC
40

controls are open bid (not negotiated by
DFD
). The required amount of training will vary with
41

each facility. Videotaping of training must be reviewed for each project. This may not be
42

required or could be reduced. Coordinate this with the ow
ner agency and
DFD

during
43

development of the project.

44


45

Contractor to provide factory authorized representative and/or field personnel knowledgeable with the
46

operations, maintenance and troubleshooting of the system and/or components defined within this sec
tion
47

for a minimum period of [XX] hours.


48


49


50


51

END OF SECTION

52