Section 10 - Service
Service to the unit must be performed by qualified
personnel. Recertify the cabinet after servicing.
Before service is to be performed on the cabinet,
the unit must be decontaminated!
10.1 Replacing Blower Motor (Models 1284/1285, 4 ft.)
a. Reversing the motor wiring (4 ft. models only)
1. On the replacement motor: Disconnect the faston con-
nectors securing the Orange wire to the Brown wire and
Yellow wire to the Purple wire.
2. Reconnect the Orange wire to the Purple wire and the
Yellow wire to the Brown wire.
b. Replacing the motor
1. Turn the unit off and disconnect it from the power
source.
2. Remove all dress panels.
3. Remove the access panel.
4. Unfasten the two latches connecting the blower to the
air plenum.
5. Remove the bolt toward the front of the cabinet that
connects the blower housing bracket to the top of the
cabinet.
6. Remove the front screw on the right hand side of the
cabinet that connects the blower housing bracket to the
right hand wall of the cabinet.
7. Loosen - do not remove, the two remaining bolts that
connect the blower housing bracket to the top of the
cabinet.
8. Loosen - do not remove, the two remaining screws that
connect the blower housing bracket to the right wall of
the cabinet.
9. Slide the blower housing toward the rear of the cabinet
as far as it will go.
10. Unbolt the removable inlet collar from the blower hous-
ing.
11. Unbolt the four-point motor mounting bracket from the
blower housing.
Model 1280 Series _____________________________________________________________________________Service
10 -1
12. Disconnect the motor wiring harness at the quick-con-
nect plug.
13. Pull the motor, motor mounting bracket, removable inlet
collar and blower wheel out of the blower housing.
14. Be sure to mark on the motor shaft the location of the
blower wheel so that the new motor shaft can be lined
up correctly with the required blower wheel position to
fit properly inside the blower housing.
Note:
After the motor is installed, but before replacing the
plenum access panel, turn the motor on to ensure that rotation is
in the clockwise direction (when viewed from the motor side of
the blower).
10.2 Replacing Blower Motor (Models 1286/1287, 6 ft.)
1. Turn the unit off and disconnect it from the power
source.
2. Remove all dress panels.
3. Remove the access panel.
4. Unfasten the two latches connecting the blower to the
air plenum.
5. Remove the two bolts toward the front of the cabinet
that connect the blower housing brackets to the top of
the cabinet.
6. Loosen - do not remove, the four remaining bolts that
connect the blower housing brackets to the top of the
cabinet.
7. Slide the blower housing toward the rear of the cabinet
as far as it will go.
8. Disconnect the motor wiring harness at the quick-con-
nect plug.
9. Unbolt the removable inlet collar from the blower hous-
ing.
10. Pull the motor, motor mounting bracket, removable inlet
collar, and blower wheel out of the blower housing.
11. Be sure to mark on the motor shaft the location of the
blower wheel so that the new motor shaft can be lined
up correctly with the required blower wheel position to
fit properly inside the blower housing.
