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COMBUSTION
AIR
AND
VENT
SYSTEM
CARBON
MONOXIDE
POISONING
HAZARD
Failure
to follow
this warning
could
result in personal
iniury
or death.
If holes are found
or if the vent pipe is obstructed
or is not
connected,
toxic fumes can escape into your home.
DO NOT
OPERATE
YOUR
FURNACE.
Call your dealer for service.
GAS
BURNER
ASSEMBLY
FLAME
SENSOR
MANUAL
RESET
UMIT
SWITCH
GAS
VALVE
--
HOT
SURFACE
J
IGNITOR
Olt+P+'_
_
0
;I
_
LIMIT
SWITCH
i
'
MAIN UMIT
SWITCH
(BEHIND
GAS
VAWE)
D
Fig. 27 - Gas Burner
Assembly
(Upflow)
Al1319
[]NIT
OPERATION
HAZARD
Failure
to follow
this caution
may result
in intermittent
unit
operation.
For
proper
and
safe
operation
the
furnace
needs
air
for
combustion
and ventilation.
Do
not block
or obstruct
air
openings
on the furnace,
air opening
to the area in which
the
furnace
is installed,
and the space around the furnace.
Visually inspect the combustion area and vent system before each
heating season. Make sure that all PVC pipes leading into the
combustion area and vent are free from any cracks and sags. An
accunmlation of dirt, soot, or rust can mean a loss of efficiency and
improper performance.
Buildups on the main burners can cause
faulty firing. This "delayed
ignition"
is characterized
by an
alarmingly loud sound.
Check the combustion-air
intake adjacent to the furnace or outside
your home for blockage. Also check the vent pipe on the outside of
your home for blockage.
NOTE:
If your furnace makes a loud noise when the main burners
are ignited, shut down the furnace and call your servicing dealer.
Use your flashlight and follow these steps for inspecting the
combustion area and vent system of your furnace:
CARBON
MONOXIDE
POISONING
HAZARD
Failure
to follow
this warning
could
result
in personal
iniury or death.
If dirt, rust, soot, or scale accumulations
are found,
call
your dealer. Do not operate
your furnace.
1. Turn off electrical
supply
and gas supply
to the furnace
and
remove
the main furnace
door.
See Fig. 7, 8, 9, 10 and 11.
IGNITOR
Fig. 28 - Gas Burner
Assembly
(Downflow)
Al1320
3. Inspect the combustion-air
and vent PVC pipes for sags,
holes, cracks, water leaks, blockage or disconnections. Hori-
zontal portions of vent pipe must slope downward toward
the furnace.
4. If your furnace is free of the above conditions turn on elec-
trical and gas supplies to the furnace.
5. Start your furnace and observe its operation. Watch the
burner flames to see if they are clear blue, almost transpar-
ent.. If you observe a suspected malfunction, or the burner
flames are not clear blue, call your dealer.
6. Replace main furnace door.
Burner Flame
Manifold
Burner
Fig. 29 - Burner
Flame
Adjustment
Al1461
ELECTRICAL
SHOCK
HAZARD
Failure
to follow
this warning
could
result
in personal
iniury or death.
Turn
off electrical
power
supply
to your
furnace
and
install
lockout
tag before
removing
the access doors
to
service or perform
maintenance.
2. Inspect
the gas burners,
igniter
area, and remainder
of fur-
nace for dirt, rust, soot or scale.
11
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