COMFORT-AIRE Century GDD95C Series, Installation Instructions Manual

Page: 46 / 53

507735-03 Page 46 of 53 Issue 1933
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 must 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.
24. Reinstall electrical junction box.
25. Reinstall the combustion air inducer. Reconnect the
combustion air inducer to the wire harness.
26. Reinstall pressure switches and reconnect pressure
switch wiring.
27. Carefully connect combustion air pressure switch
hosing from pressure switches to proper stubs on cold
end header collector box.
28. Reinstall condensate trap.
29. Reconnect exhaust piping and exhaust drain tubing.
30. Reinstall burner box assembly in vestibule area.
31. Reconnect flame rollout switch wires.
32. Reconnect sensor wire and reconnect 2 pin plug from
ignitor.
33. Secure burner box assembly to vestibule panel using
four existing screws. Make sure burners line up in
center of burner ports.
34. Reinstall gas valve manifold assembly. Reconnect gas
supply line to gas valve.
35. Reconnect 2 wires to gas valve.
36. Replace the blower compartment access panel.
37. Refer to instruction on verifying gas and electrical
connections when re-establishing supplies.
38. 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.
39. Replace heating compartment access panel.
Cleaning the Burner Assembly
1. Turn off electrical and gas power supplies to furnace.
Remove upper and lower furnace access panels.
2. Disconnect the 2 pin plug from the gas valve.
3. Remove the burner box cover.
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 2 pin plug from the ignitor at the burner
box.
6. Remove four screws which secure burner box
assembly to vest panel. Remove burner box from the
unit.
7. 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.
8. Reconnect the sensor wire and reconnect the 2 pin
plug to the ignitor wiring harness.
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. Reinstall the gas valve manifold assembly. Reconnect
the gas supply line to the gas valve. Reinstall the
burner box cover.
11. Reconnect 2 pin plug to gas valve.
12. Replace the blower compartment access panel.
13. Refer to instruction on verifying gas and electrical
connections when re-establishing supplies.
14. 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.
15. Replace heating compartment access panel.