HVACR115 Gas Mechanical

monkeyresultΜηχανική

22 Φεβ 2014 (πριν από 3 χρόνια και 6 μήνες)

77 εμφανίσεις

1

HVACR115


Gas Mechanical

Gas Flame Characteristics

2

Flame Characteristics


By observing the flame pattern on a gas
furnace the experienced technician can tell a
lot about what is going on in the furnace and
the gas supply.


The shape, the color and the pattern of the
flame are all things to keep in mind.


By observing how furnaces run correctly you
can tell what is wrong with a furnace. Which
is why most new technicians spend time
doing preventative visits before service calls.

3

Types of problems


Types of flame:


Flame lifting


Flame flashback


Yellow flame


Flame floating


Flame rollout


Flame to small

4

Good Flame

5

Flame Lifting


Flame lifts off the burner a little bit.


It is a turbulent an noisy flame


Can cause carbon monoxide



Caused by too much primary air, too large of a
burner orifice, too high of gas pressure.

6

Flame Flashback


Causes combustion too occur inside the burner


Flame will come out the wrong end of the burner
tube, almost like a roll
-
out.



Caused by low manifold pressure, too much
primary air, dirty burner orifice, dirty burners, low
gas supply pressure.

7

Yellow Flame


This is a yellow tipped flame.


Can cause carbon monoxide and soot buildup.



Caused by inadequate primary air (too little), dirty
burner orifices, restricted heat exchanger,
restricted vent system.

8

Flame Floating


This flame waves around, is not steady and is a
lazy appearing flame.



Caused by insufficient secondary air, restricted
heat exchanger, and air blowing flame through
heat exchanger.


May be sign of a cracked heat exchanger.

9

Flame Rollout


The flame is going in the wrong direction through
the burners and heat exchangers.



Caused by a restricted heat exchanger, blocked
vent system, inadequate primary air, high gas
manifold pressure.

10

Flame too small


Flame is just too small, may not be heating the
building properly.



This can be caused by low gas manifold pressure,
dirty or blocked burner orifice, or the burner orifice
may be too small (DO NOT ADJUST ORIFICE
SIDE WITHOUT CHECKING WITH
MANUFACTURER TECHNICAL SUPPORT!)