440 01 4801 00
69
Specifications subject to change without notice.
BLOWER WHEEL SET-SCREW
SHALL BE TIGHTENED TO
160 IN.-LB. +/-20 IN. -LB.
MOTOR SHAFT FLAT
BLOWER
WHEEL
HUB
GROMMET
MOTOR
ARM
WASHER
SCREW
BRACKET
BLO HSG ASSY
BRACKET, BLO MTG (LEFT)
SCREW (2)
ENSURE THAT
WRAPPER IS OVER
TAB ON EACH SIDE
BRACKET, BLO MTG (RIGHT)
BLOWER MOTOR
SCREW
SCREW
LOCATIONS
BLO HSG ASSY
SCREW (3)
SCREW (3)
SCREW
COLLAR
A190407
Fig. 69 -- Blower Assembly on 1002122
Blower Motor and Wheel Maintenance
To ensure long life, economy, and high efficiency, clean
accumulated dirt and grease from blower wheel and motor
annually.
The inducer and blower motors are pre--lubricated and require no
additional lubrication. These motors can be identified by the
absence of oil ports on each end of the motor.
The following items should be performed by a qualified service
technician. Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove blower door.
3. All factory wires can be left connected, but field thermostat
and accessory wiring may need to be disconnected depend-
ing on their length and routing.
4. If the vent and combustion air pipe passes through the
blower compartment, it will be necessary to remove the
pipes from the blower compartment.
Disconnect the vent and combustion air pipe by:
a. Loosen the clamps on the vent couplings and combustion
air pipe external to the furnace.
b. Separate the pipes from the couplings and move them
aside.
c. Loosen the clamps on the vent couplings and combustion
air pipe located on the blower shelf.
d. Separate the pipes from the blower compartment and set
aside.
e. Remove the couplings from the pipe adapters and set aside.
f. After servicing the blower, reverse steps a through e.
g. Tighten all clamps 15 lb --in.
See Fig. 68 For Steps 5 through 14.
5. Remove screws securing blower assembly to blower shelf
and slide blower assembly out of furnace. Detach ground
wire and disconnect blower motor harness plugs from blow-
er motor.
NOTE:
Blower wheel is fragile. Use care.
NOTE:
On 1002122 size, the top screw securing blower to shelf
must be removed in order to remove the blower. (See Fig. 69)
6. Clean blower wheel and motor by using a vacuum with soft
brush attachment. Be careful not to disturb balance weights
(clips) on blower wheel vanes. Do not bend wheel or blades
as balance will be affected.
7. If greasy residue is present on blower wheel, remove wheel
from the blower housing and wash it with an appropriate
degreaser. To remove wheel:
NOTE
: The DIBC composite wheel used in some models should
be cleaned with mild soapy water only. Allow wheel to dry prior to
reassembly.
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.
f. Remove blower wheel from housing.
g. Clean wheel per instructions on degreaser cleaner. Do not
get degreaser in motor.
8. Reassemble motor and blower wheel by reversing items 7b
through 7f. Ensure wheel is positioned for proper rotation.
9. Torque motor mounting bolts to 40 +/-- 10 lb--in.. when re-
assembling.
10. Torque blower wheel set screw to 160 +/-- 20 lb--in.. when
reassembling.
11. Verify that blower wheel is centered in blower housing and
set screw contacts the flat portion of the motor shaft. Loosen
set screw on blower wheel and reposition if necessary.
12. Spin the blower wheel by hand to verify that the wheel does
not rub on the housing.
13. Reinstall blower assembly in furnace.
NOTE
: On 1002122, ensure that the blower wrapper sits on top of
the two tabs on blower sidewalls. (See Fig. 69)
14. Reinstall 2 screws securing blower assembly to blower
deck.
15. Reconnect blower leads to furnace control. Refer to furnace
wiring diagram, and connect thermostat leads if previously
disconnected.
NOTE:
Be sure to attach ground wire and reconnect blower
harness plugs to blower motor.
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal injury
or death.
Blower door switch opens 115--v power to control. No
component operation can occur unless switch is closed.
Caution must be taken when manually closing this switch for
service purposes.
!
WARNING
16. Downflow or horizontal furnaces with vent pipe through
furnace only:
a. Install and connect short piece of vent pipe inside furnace
to existing vent.
b. Connect vent connector to vent elbow.