507581-05
Page 60 of 62
Issue 2220
Planned Service
A service technician should check the following items during an annual inspection. Power to the unit must be shut off for
safety.
Fresh air grilles and louvers
(on the unit and in the
room where the furnace is installed) - Must be open and
unobstructed to provide combustion air.
Burners
- Must be inspected for rust, dirt, or signs of water.
Vent pipe
- Must be inspected for signs of water, cracked,
damaged or sagging pipe, or disconnected joints.
Unit appearance
- Must be inspected for rust, dirt, signs of
water, burnt or damaged wires, or components.
Blower access door
- Must be properly in place and
provide a seal between the return air and the room where
the furnace is installed.
Return air duct
- Must be properly attached and provide
an air seal to the unit.
Operating performance
- Unit must be observed during
operation to monitor proper performance of the unit and
the vent system.
Combustion gases
- Flue products should be analyzed
and compared to the unit specifications.
Problems detected during the inspection may make it
necessary to temporarily shut down the furnace until the
items can be repaired or replaced.
Instruct the homeowners to pay attention to their
furnace.
Situations can arise between annual furnace
inspections that may result in unsafe operation. For
instance, items innocently stored next to the furnace may
obstruct the combustion air supply. This could cause
incomplete combustion and the production of carbon
monoxide gas.
36. Reinstall electrical junction box.
37. Reinstall the combustion air inducer and flexible no
hub connector. Reconnect the 2 pin plug to the wire
harness.
38. Reconnect drain tubes between flue collar and cold
end header box.
39. Secure burner assembly to vestibule panel using four
existing screws. Burners are self aligning to center of
clam shells.
40. Reconnect gas supply line to gas valve.
41. Reconnect flame rollout switch wires.
42. Reconnect sensor wire and reconnect 2 pin plug from
ignitor.
43. Reconnect wires to gas valve.
44. Replace the blower compartment access panel.
45. Refer to instruction on verifying gas and electrical
connections when reestablishing supplies.
46. 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.
47. Replace heating compartment access panel.
Cleaning the Burner Assembly
1. Turn off gas and electrical power to the furnace.
Remove heating compartment access panel.
2. Disconnect the gas supply line from the gas valve.
3. Disconnect and label wires from gas valve.
4. Disconnect ignitor wiring at 2 circuit plug.
5. Disconnect and label wires from rollout switch.
6. Disconnect and label flame sensor wire.
7. Disconnect and label ground wire from burner/manifold
assembly.
8. Remove four screws that secures burner/manifold
assembly to vestibule. Remove the assembly and
make note not to allow ignitor plate to dislodge from
the assembly.
9. Gently clean the face of the burners using the soft
brush attachment on a vacuum cleaner. Visually
inspect the inside of the burners and crossovers for
any blockage caused by foreign matter. Remove any
blockage
10. Reinstall the burner/manifold assembly using the
existing four screws. Burners are self aligning to
center of clam shells.
11. Reconnect ground wire.
12. Reconnect flame sensor wire.
13. Reconnect rollout switch wires.
14. Reconnect ignitor wires.
15. Reconnect gas valve wires.
16. Reconnect gas supply line to gas valve.
17. Refer to instructions on verifying gas and electrical
connections when re-establishing supplies.
18. Follow instructions to place furnace in operation. Run
furnace 5 minutes to ensure burners are clean and
operating correctly.
19. Replace heating compartment access panel.
