21.Remove two screws from the front cabinet flange at the blower deck. Spread cabinet sides slightly to allow clearance for removal of heat exchanger.
22.Remove screws along vestibule sides and bottom which secure vestibule panel and heat exchanger assembly to cabinet. Remove two screws from blower rails which secure bottom heat exchanger flange. Remove heat exchanger from furnace cabinet.
23.Back wash heat exchanger with soapy water solution or steam. If steam is used it must be below 275°F (135°C).
24.Thoroughly rinse and drain the heat exchanger. Soap solutions can be corrosive. Take care to rinse entire assembly.
25.Reinstall heat exchanger into cabinet making sure that the rear baffle of the heat exchanger assembly is nested under the support located at the rear of the cabinet. Remove the indoor blower to view this area through the blower opening.
26.
27.Reinstall blower assembly and reinstall two screws through rails.
28.Reinstall cabinet screws on front flange at blower deck.
29.Reinstall screws securing top cap.
30.Reinstall the primary limit on the vestibule panel.
31.Route heating component wiring through hole in blower deck and reinsert strain relief bushing.
32.Reinstall pressure switch and reconnect pressure switch wiring.
33.Carefully connect combustion air pressure switch hosing from pressure switch to proper stubs on cold end header collector box.
34.Reinstall 1/2" NPT (if removed) in the cold end header box. Reconnect drain tubing to collector box.
35.Reinstall condensate trap pipe. Reconnect condensate drain line to the condensate trap.
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
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.
Issue 1031 | Page 43 of 48 |
