d. If 24 volts is present, remove the pilot burner and
remove the pilot orifice from the pilot burner. The orifice
is removed in the direction opposite the flow of gas.
Inspect the orifice for obstruction. If it is clear, replace
the main gas valve.
5. The sparker sparks at the pilot burner but the pilot does not
ignite and a gas odor is detected at the draft motor outlet.
a. Adjust the pilot adjust screw on the gas valve as
described in “PILOT CHECKOUT”.
b. Check the supply pressure as described in “POST
START CHECK LIST”. Make adjustments as necessary.
c. Check the pilot orifice for obstruction as described in
Item 4. Clean as needed but the problem should not be
the gas valve.
6. The pilot burner ignites but the sparker continues to spark
and the main burners do not ignite.
a. Make the same checks and adjustment as described in
Item 5.
b. Make sure that the pilot burner is not bent or damaged.
c. Make sure that the ground connections at the pilot
burner, gas valve and ignitor control are intact. Check
the high tension wire for good electrical connection. If
all are intact, replace the ignitor module.
7. The pilot burner lights and the spark stops but the main
burners do not light.
a. Check electrical connections between the ignitor con-
trol and the gas valve. If intact, check for 24 volts across
terminals “MV” and “COMMON” terminals. If no voltage
detected, replace ignitor control. If voltage is present,
replace gas valve.
8. Furnace lights with roll out or one burner has delayed
ignition.
a. Make sure that the pilot burner is aligned properly with
the carryover as described in “PILOT CHECKOUT”.
b. Make sure that the carryovers on adjoining burners are
screwed fast and are level with respect to one another.
9. Main burners light but exhibit erratic flame characteristics.
a. Adjust air shutters as described in “BURNER AIR
SHUTTER ADJUSTMENT”.
b. Check the main burner orifices for obstruction and
alignment. Removal procedure is described in
“BURNER INSTRUCTIONS”. Clean or replace burner
orifices and burners as needed.
REPLACEMENT PARTS
COMPRESSOR SECTION
•
Hermetic compressor
•
Compressor mounting
MOTOR SECTION
•
Blower motor
•
Fan motor
•
Ventor motor
ELECTRICAL SECTION
•
Ignition control
•
Relay board
•
Contactor
•
Circuit breaker
•
Temperature controls
•
Capacitors
•
Relays
•
Transformers
•
Connectors
GAS HEAT SECTION
•
Heat exchanger
•
Gas valve
•
Pilot
•
Flame sensor
•
Spark ignitor
•
Gas manifold
•
Gas burner
AIR MOVING SECTION
•
Blower wheel
•
Blower wheel housing
REFRIGERANT SECTION
•
Evaporator coil
•
Evaporator coil header
•
Expansion valve assembly
•
Condenser coil
•
Condenser coil header
FABRICATED PARTS SECTION
•
Panels
•
Posts
•
Covers Drain pans
•
Base rails
•
Air hoods
MISCELLANEOUS SECTION
•
Air inlet hood screen
•
Fan guard
•
Air filters
TO OBTAIN PARTS INFORMATION: Replacement parts and information from OUR current parts list for this unit are available to
your servicing contractor through our local distributor. The name and address of our nearest distributor may be obtained by
consulting the Yellow Pages of a local telephone directory.
IMPORTANT: In order to supply the correct part or information from the parts list, our distributor will need to be provided with the
complete model number listed on the rating plate located on your unit. See page 2 for Product Nomenclature.
WARNING: IMPROPER INSTALLATION, ADJUSTMENT, SERVICE OR MAINTENANCE CAN CAUSE INJURY OR PROPERTY
DAMAGE. CONSULT A QUALIFIED INSTALLER, SERVICE AGENCY OR YOUR LOCAL GAS SUPPLIER FOR INFORMATION
OR ASSISTANCE.
511.17-N2W
Unitary Products Group
19
