Carrier 40UV075 Installation, Start-Up And Service Instructions Manual page 33

• The motor must be installed per the instructions below. It
is important to maintain the dimension between the fan
compartment bulkhead and the coupling.
IMPORTANT: If a replacement cooling shroud has
been supplied, it should be installed and the old one
discarded. The motor shroud directs cooling air across
the motor to provide proper cooling. Never run the
motor without the cooling shroud in place. Ensure the
shroud inlet ring does not touch the motor; a gap of
1 / -in. to 1 / -in. is acceptable.
16 8
CAUTION
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. 24:
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. Re-install 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. Re-install 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. Re-install the motor wire plugs.
33
CAUTION