Bryant 926TC Installation, Start-Up, Operating And Service And Maintenance Instructions page 66

926TC: Installation, Start-up, Operating and Service and Maintenance Instructions
TORQUE THE BLOWER
WHEEL SET SCREW
160 LB-IN +/- 20 LB-IN.
Fig. 66 – Blower Assembly
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 depending 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 or screw 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, resealing
combustion air pipe per installation instructions.
g. Tighten all clamps 15 lb -in.
See Fig. 66 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 blower motor.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
BLOWER WHEEL SET-SCREW
SHALL BE TIGHTENED TO
160 IN.-LB. +/-20 IN. -LB.
MOTOR SHAFT FLAT
SCREW
LOCATIONS
BLOWER INLET
ORIFICE
BRACKET, BLO MTG (LEFT)
SCREW (3)
BLOWER MOTOR
A190094B
NOTE: Blower wheel is fragile. Use care.
NOTE: On 66100V21 size, the top screw securing blower to shelf must
be removed in order to remove the blower. (See
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.
66
BLOWER
WHEEL
HUB
BRACKET BLO HSG ASSY
ENSURE THAT
WRAPPER IS OVER
TAB ON EACH SIDE
SCREW (2)
BRACKET, BLO MTG (RIGHT)
SCREW (3)
SCREW
Fig. 67 – Blower Assembly on
66100V21
GROMMET
MOTOR
COLLAR
ARM
WASHER
SCREW
BLO HSG ASSY
BLOWER MOTOR
SCREW
A190407
Fig. 67)