5
a. Mark blower wheel location on shaft before disassembly
to ensure proper reassembly.
b. Loosen setscrew holding blower wheel on motor shaft.
NOTE
: Mark blower mounting arms and blower housing so each
arm is positioned at the same hole location during reassembly.
c. Mark blower wheel orientation and cutoff plate location
to ensure proper reassembly.
d. Remove screws securing cutoff plate and remove cutoff
plate from housing.
e. Remove bolts holding motor mounts to blower housing
and slide motor and mounts out of housing. Disconnect
capacitor and ground wire attached to blower housing
before removing motor. Motor mounts need not be
removed from motor.
f. Remove blower wheel from housing.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in noise or furnace
component failure.
The blower wheel should not be dropped or bent as balance
will be affected.
CAUTION
!
g. Clean wheel per instructions on degreaser cleaner. Do
not get degreaser in motor.
9. Reassemble motor and blower wheel by reversing items 8b
through 8f. Ensure wheel is positioned for proper rotation.
Be sure to reattach ground wire. Tighten setscrew to 140 to
160 in--lb torque.
NOTE
: Be sure to attach ground wire and reconnect blower
harness plugs to blower motor.
10. Reinstall blower assembly in furnace.
11. Reinstall control box, transformer, and door switch as-
sembly on blower shelf.
12. Reinstall condensate trap and tubing if previously removed.
a. Reinstall condensate trap in hole in blower shelf.
b. Connect condensate trap drain tubes. See Fig. 5 or
tubing diagram on main furnace door for proper tube
location.
NOTE
: Ensure tubes are not kinked or pinched, as this will affect
operation.
(1.) Connect one tube (blue or blue and white striped)
from collector box.
(2.) Connect one tube (violet or unmarked) from in-
ducer housing.
(3.) Connect one tube (relief port, green or pink) from
collector box.
c. Connect field drain to condensate trap.
NOTE
: Ensure tubes are not kinked or pinched, as this will affect
operation.
13. Reinstall control box, transformer, and door switch as-
sembly on blower shelf.
14. Reconnect wires.
Refer to furnace wiring diagram and connect thermostat
leads if previously disconnected. (See Fig. 21.)
NOTE
: Refer to Table one for motor speed lead reconnection if
leads were not identified before disconnection.
UNIT DAMAGE HAZARD
Failure to adjust the heating speed may shorten heat
exchanger life.
Heating speed selection MUST be adjusted to provide
proper temperature rise as specified on the rating plate.
CAUTION
!
Table 2 – Speed Selection
COLOR
SPEED
FACTORY
ATTACHED TO
Black
High
Cool
Yellow (When Present)
Medium High
Spare
Blue
Medium Low
Heat
Red
Low
Fan
White
Common
Com
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Blower access panel door switch opens 115--v power to
furnace control. No component operation can occur.
Caution must be taken when manually closing this
switch for service purposes.
!
WARNING
15. Turn on electrical supply. Manually close blower access
panel door switch. Use a piece of tape to hold switch closed.
Check for proper rotation and speed changes between heat-
ing and cooling by jumpering R to G and R to Y/Y2 on
furnace control thermostat terminals. (See Fig. 15.)
16. If furnace is operating properly, release blower access panel
door switch, replace blower access panel, and replace main
furnace door.
MANIFOLD
MOUNTING
SCREWS
MANIFOLD
GAS VALVE
REGULATOR
FITTING
GAS
CONTROL
VALVE
CELL
PANEL
GASKET
A02312
Fig. 6 -- Burner Box Assembly
PG
9M
AB
