Carrier 40UV Installation, Start-Up And Service Instructions Manual page 52

Ensure the unit is completely assembled when checking the
fan speed. Replace all panels, including the filters, before
checking the fan for operation. When the internal pressure
drops at a normal condition, the loading on the motor will
be such that the fan can come up to selected speed.
Failure to ensure unit is completely assembled may
result in reduced life of unit and/or personal injury.
To remove and re-install the motors, proceed as follows;
refer to Fig. 36:
1. Remove the wire plugs from the motor.
2. Remove the 2 screws holding the motor shroud to the
bulkhead.
3. Slide the shroud off the motor to the right.
4. Loosen the 3 setscrews on the shaft coupling between the
motor shaft and the fan shaft.
5. Loosen the motor 'belly band' and slide motor out of the
'belly band' to the right. It is unnecessary to remove the
motor mounting bracket from the bulkhead. Loosen only
the 'belly band' securing the motor in the mount.
6. Reinstall the motor in the 'belly band.'
7. Ensure the blower wheels are centered within the fan
housings (between the inlet rings) before securing the
motor shaft coupling.
The motor electronics will fail prematurely if no air is able
to circulate over the motor.
8. Ensure the motor housing is at least 1 in. from the
bulkhead so that air will be able to circulate over the
motor.
9. For vertical type units, position the motor so that the
motor wire plugs are front facing on a horizontal plane.
For horizontal type units with ceiling mounts, position the
motor so that the motor wire plugs are front facing on a
vertical plane.
10. Secure the 3 setscrews on the shaft coupling when the
motor is properly positioned and the blower wheels are
centered within their housing.
11. Re-secure the motor 'belly band' around the motor.
12. Reinstall the motor shroud. It is important that the motor
shroud be installed prior to operation of the motor. Ensure
the venturi is installed on the motor shroud.
13. Re-secure the two screws holding the motor shroud to the
bulkhead.
14. Reinstall the motor wire plugs.
Blower Assembly Section Removal and Rein-
stallation (Fig. 37)
Lock out and tag all power supplies to equipment and con-
trols prior to servicing unit. Follow all safety codes. Failure
to do so could result in personal injury.
Be careful with all components during installation, espe-
cially the bearing and plastic blower wheels. Any extreme
force applied to these components can cause unintended
damage and could void the unit warranty.
To remove blower assembly:
1. Turn off power to the unit.
IMPORTANT: Tag each right front panel (40UV) or
middle bottom panel (40UH) for each unit. Panels have
electrical information specific to each unit.
2. Remove all front (40UV) or bottom (40UH) panels. Re-
move end panels.
3. Remove top panel with
vanes and screens to the side (40UV). Remove ductwork
if required and remove top (40UV) or front (40UH) dis-
charge plenum.
1
4. Remove / in. head screws along length of unit that se-
4
cure coil baffle to blower section. See Item 5 in Fig. 37.
1
5. Remove four / in. head screws that connect the blower
4
section sides to the coil section sides. See Item 2 in
Fig. 37.
6. Remove the 1 / in. head screw from the center of the
4
blower deck that attaches the blower deck to the pipe
chase. See Item 1 in Fig. 37.
1
7. Remove six / in. head screws attaching coil baffle to
4
coil section. See Item 4 in Fig. 37.
8. Remove the harness connector(s) from the motor.
1
9. Remove the / in. head screw from the green ground
4
wire that connects the motor to frame if unit has a PSC
motor. ECM motors are grounded through the harness.
10. Remove the two carriage bolts retaining the front brace to
the frame sides. See Item 6 in Fig. 37.
11. Remove the four nuts retaining the blower section to the
back (40UV) or top (40UH) frame. See Item 3 in Fig. 37.
5
12. Remove the two
bracket to the pipe chase (40UV,UH150 units only). See
Item 6 in Fig. 38.
13. Remove blower section from frame.
52
5 / in. nut driver and set optional
16
/ in. nuts retaining the inboard bearing
16