Condenser Fans; Evaporator Fans And Motor; Motor Removal; Fan Shaft Bearing Removal - Carrier 48MA/50ME016-040 Installation, Start-Up And Service Instructions Manual

Fig. 37 — Motormaster Thermistor
Locations on Condenser Coil

Condenser Fans

Shut off service switch to deenergize condenser-fan
motors.
ADJUSTMENT — Remove fan guard from top of unit. Re-
move rubber hubcap from fan hub and loosen fan hub set-
screws. Adjust fan height using a straight edge laid across
fan deck venturi (Fig. 38). Tighten setscrews and replace rub-
ber hubcap to prevent hub from rusting to motor shaft. Fill
hub recess with Permagum (or similar adhesive) if rubber
hubcap is missing.
FAN MOTOR REMOVAL — Disconnect motor electrical
leads at motor control box. Loosen fan hub setscrews and
remove fan. Loosen motor mounting band and lift out
motor.
Reverse this procedure for reassembly.
LUBRICATION — Condenser-fan motors have factory-
lubricated bearings. No relubrication is necessary for the first
3 to 5 years of continuous operation except in excessively
dirty outdoor-air applications. After the first relubrication bear-
ings must be opened, cleaned, and repacked annually with
light- to medium-duty multi-purpose grease.

Evaporator Fans and Motor

Shut off service switch to deenergize evaporator-fan
motor.
MOTOR REMOVAL — Disconnect motor power wires at
conduit connection on unit junction box. Then remove mo-
tor and conduit assembly from unit.

FAN SHAFT BEARING REMOVAL

1. Remove fan motor and belts.
2. Loosen the locknut on each shaft bearing collar and re-
move the fan drive pulley.
3. Loosen the fan wheel locknuts and slide out fan shaft.
4. Remove the 2 bearings.
Reverse steps 1-4 to reassemble.
FAN SPEED ADJUSTMENT — Pulley listed in Table 1 is
factory installed in the unit.
If the factory-supplied pulley is not suitable, provide a field-
supplied pulley of the correct size as required. Refer to
Table 1 for additional fan data.
IMPORTANT: Increasing fan speed increases load on
motor. Do not exceed maximum fan motor full load
amperage (Tables 2 and 3).
Fig. 38 — Condenser-Fan Adjustment
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