17. Reinstall rear center panel of unit.
18. Remove burner patch plate from rear center panel of unit, cut
insulation, and reinstall burner/manifold assembly through
rear of unit. Ensure manifold assembly slides under front
manifold retention plate.
19. Reinstall rear manifold retention plate and tighten screws on
both retention plates.
20. Disconnect wiring from limit switch and remove limit switch.
21. Disconnect wiring from pressure switches using needle nose
pliers.
22. Remove control box cover and disconnect blower leads from
control board.
23. Disconnect tubing to pressure switches (mark tubing P1 and
P2) and remove switches. (See Fig. 13.)
24. Remove control box from unit with draft inducer motor
attached.
25. Remove 4 screws securing inducer assembly plate to front
center panel.
26. Remove 4 screws securing front center panel to vent return
pipe.
27. To avoid cuts during this procedure, place a piece of card-
board between condensing heat exchanger fins and vent return
pipe. From rear of unit, remove 4 screws securing vent return
pipe to bottom plate of condensing heat exchanger.
NOTE:
Any gaskets or seals broken in items 25, 26, or 27 MUST
be resealed properly to ensure safe furnace operation.
If the integrity of any gasket or seal is questionable due to
separation of the gasket material, malformed appearance, or
any noticeable deformity, the gasket material must be re-
placed. Failure to replace gaskets may result in nuisance
tripping of safety controls, unit operation failure, or other
conditions which may lead to personal injury.
28. Inspect gasket material on vent return pipe and on condensing
heat exchanger bottom plate. Replace gasket material if
necessary.
29. Reinstall vent return pipe so pipe outlet is facing rear of unit.
Reinstall 4 washers and nuts securing pipe to heat exchanger
bottom plate. Remove and discard cardboard previously
placed between fins and pipe. Remove patch plate and cut
insulation on rear center panel and position vent return pipe
through panel. Secure pipe to panel with 4 screws.
30. Remove blower motor wiring harness strain relief from front
center panel. Cut insulation and reinstall strain relief in same
opening on back center panel. Route harness behind vent
return pipe and through strain relief.
31. Remove pressure tubing strain relief from front center panel.
Pull tubing through grommets and remove grommets. Cut
insulation and reinstall grommets in similar openings in rear
center panel. Route pressure tubing through grommets. Label
1 tube "top of coil" and the other "bottom of coil."
32. Reinstall rear heat exchanger panel.
33. Position control box (with wiring still attached to draft inducer
motor and burner cover plate) on rear heat exchanger panel,
route blower wiring into control box, and reinstall box.
34. Inspect gasket material on draft inducer assembly plate, and
replace gasket material if necessary.
35. Reinstall draft inducer assembly on rear center panel over vent
return pipe.
36. Reinstall air inlet plate/burner removal cover and manifold
cover plate.
37. Reinstall limit switch with sensing disc toward blower.
38. Remove condensate drain line and reinstall through rear center
panel.
39. Reinstall pressure switches on rear center panel. Route pres-
sure tubing to switches and reconnect tubing as shown in Fig.
13.
Fig. 11—Rollout Switch Assembly
A92306
SWITCH BRACKET
REMOVE
BASE BRACKET
Fig. 12—Position of Pilot Assembly to Burner
A91064
1
/
8
″
Fig. 13—Pressure Tubing Diagram
A91218
P2
P1
PRESSURE SWITCH TUBE ROUTING
1
2
3
TOP OF THE CONDENSING COIL
BOTTOM OF THE CONDENSING COIL
INDUCED
DRAFT
MOTOR
10
