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10- Inspect the furnace intake and exhaust pipes to make
sure they are in place, structurally sound, without
holes, blockage or leakage and the exhaust pipe
is sloped toward the furnace. Inspect terminations
to ensure they are free of obstructions and are
structurally sound. Inspect the furnace return air
duct connection to ensure the duct is sealed to the
furnace. Check for air leaks on supply and return
ducts and seal where necessary.
11- Inspect the furnace return air duct connection to
ensure the duct is sealed to the furnace. Check for
air leaks on supply and return ducts and seal where
necessary.
12- Check the condition of the furnace cabinet insulation
and repair if necessary.
13- Perform a complete combustion analysis during the
furnace inspection to ensure proper combustion
and operation. Consult Service Literature for proper
combustion values.
14- Verify operation of CO detectors and replace
batteries as required.
Perform a general system test. Turn on the furnace
to check operating functions such as the start-up and
shut-o operation.
1 - Check the operation of the ignition system, inspect
and clean ame sensor. Check microamps before
and after. Check controls and safety devices (gas
valve, ame sensor, temperature limits). Consult
Service Manual for proper operating range. Thermal
Limits should be checked by restricting airow and
not disconnecting the indoor blower. For additional
details, please see Service and Application Note
H049.
2 - Verify that system total static pressure and airow
settings are within specic operating parameters.
3 - Clock gas meter to ensure that the unit is operating at
the specied ring rate. Check the supply pressure
and the manifold pressure. If manifold pressure
adjustment is necessary, consult the Service
Literature for unit specic information on adjusting
gas pressure. Not all gas valves are adjustable.
Verify correct temperature rise.
Winterizing and Condensate Trap Care
1 - Turn o power to the furnace.
2 - Have a shallow pan ready to empty condensate
water.
3 - Remove the clean out cap from the condensate trap
and empty water. Inspect the trap then reinstall the
clean out cap.
Cleaning the Burner Assembly
If cleaning the burners becomes necessary, follow the
steps below:
1 - Turn o electrical and gas power supplies to furnace.
Remove upper and lower furnace access panels.
2 - Disconnect the wires from the gas valve.
3 - Remove the burner box cover (if equipped).
4 - Disconnect the gas supply line from the gas valve.
Remove gas valve/manifold assembly.
5 - Mark and disconnect sensor wire from the sensor.
Disconnect wires from ame rollout switches.
6 - Disconnect combustion air intake pipe. It may be
necessary to cut the existing pipe to remove burner
box assembly.
7 - Remove four screws which secure burner box
assembly to vest panel. Remove burner box from
the unit.
8 - Use the soft brush attachment on a vacuum cleaner
to gently clean the face of the burners. Visually
inspect the inside of the burners and crossovers for
any blockage caused by foreign matter. Remove any
blockage.
9 - Reinstall the burner box assembly using the existing
four screws. Make sure that the burners line up in the
center of the burner ports.
10 - Reconnect the sensor wire and reconnect the 2-pin
plug to the ignitor wiring harness. Reconnect wires
to ame rollout switches.
11 - Reinstall the gas valve manifold assembly.
Reconnect the gas supply line to the gas valve.
Reinstall the burner box cover.
12 - Reconnect wires to gas valve.
13 - Replace the blower compartment access panel.
14 - Refer to instruction on verifying gas and electrical
connections when re-establishing supplies.
15 - Follow lighting instructions to light and operate
furnace for 5 minutes to ensure that heat exchanger
is clean and dry and that furnace is operating
properly.
16 - Replace heating compartment access panel.
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