Carrier 48MA/50ME016-040 Installation, Start-up And Service Instructions Manual

Contents

Carrier 48MA/50ME016-040 Installation, Start-up And Service Instructions Manual Manual pdf 41 page image

Condenser FansShut off service switch to deenergize condenser-fanmotors.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 acrossfan deck venturi (Fig. 38). Tighten setscrews and replace rub-ber hubcap to prevent hub from rusting to motor shaft. Fillhub recess with Permagum (or similar adhesive) if rubberhubcap is missing.FAN MOTOR REMOVAL — Disconnect motor electricalleads at motor control box. Loosen fan hub setscrews andremove fan. Loosen motor mounting band and lift outmotor.Reverse this procedure for reassembly.LUBRICATION — Condenser-fan motors have factory-lubricated bearings. No relubrication is necessary for the first3 to 5 years of continuous operation except in excessivelydirty outdoor-air applications. After the first relubrication bear-ings must be opened, cleaned, and repacked annually withlight- to medium-duty multi-purpose grease.Evaporator Fans and MotorShut off service switch to deenergize evaporator-fanmotor.MOTOR REMOVAL — Disconnect motor power wires atconduit connection on unit junction box. Then remove mo-tor and conduit assembly from unit.FAN SHAFT BEARING REMOVAL1. 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 isfactory installed in the unit.If the factory-supplied pulley is not suitable, provide a field-supplied pulley of the correct size as required. Refer toTable 1 for additional fan data.IMPORTANT: Increasing fan speed increases load onmotor. Do not exceed maximum fan motor full loadamperage (Tables 2 and 3).Fig. 37 — MotormasterT ThermistorLocations on Condenser CoilFig. 38 — Condenser-Fan Adjustment41