Carrier 48MA/50ME016-040 Condenser Fans, Evaporator Fans and Motor, FAN Shaft Bearing Removal

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Fig. 37 Ð Motormaster Thermistor

Locations on Condenser Coil

Condenser Fans

Shut off service switch to deenergize condenser-fan motors.

ADJUSTMENT Ð 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 Ð 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 Ð 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 ®rst 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 Ð 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 Ð Pulley listed in Table 1 is factory installed in the unit.

If the factory-supplied pulley is not suitable, provide a ®eld- 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 Ð Condenser-Fan Adjustment

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Contents Contents Installation, Start-Up Service InstructionsInstallation Safety ConsiderationsBase Unit Physical Data and Dimensions 48MA Units Base Unit Physical Data and Dimensions 50ME Units Roof Curb Detail Removing Shipping Shields FigPhysical Data Roof Curb Physical Data and Dimensions 48MA Units Roof Curb Physical Data and Dimensions 50ME Units Shipping Shield Locations Units Shown Suggested Gas Piping 48MA Unit 48MA Electrical Data Unit 50ME Electrical Data Unit 50ME Electrical Application Data ECT Field Control WiringZone Control Board Component Location Cooling Cooling Stage 1 Ð First stage of modules 1, 2, Cooling Stage 1 Ð First stage of modules 1, 2, 3, Cooling Stage 1 Ð Modules 1 and 3 Stage 2 Ð Modules 2 Cooling Modules Setting Stage 1 Ð First stage of modules 1 Cooling Stage 1 Ð First stage of modules 1, 2, Cooling 50ME Two-Stage Heat, One-Stage Cool Ð 4 Module Joint Control Cooling Stage 1 Ð Modules 1 and 3 Stage 2 Ð Modules 2 Cooling Modules Setting HA1 HA2 APS START-UPAdjustment Gas Heat Lighting Procedure 48MAMGV Pressure Adjustment Natural GASSpoiler Screw Location Units with 3-ELEMENT Heaters Units with 2-ELEMENT HeatersAir¯ow Switches ServiceCabinet Panels and Grilles Condenser and OUTDOOR-AIR Cooling CoilsHead Pressure Control Compressor Capacity Control UnloadersTo ADD or Remove OIL LOW ChargeFAN Shaft Bearing Removal Condenser FansEvaporator Fans and Motor Optional Economizer Ð See Fig Forced-Draft Blower 48MAPulley Removal OperationEconomizer and Exhaust Damper Assemblies, Exploded View Page Page Packaged Service Training Page RETURN-AIR Temperature OUTDOOR-AIR TemperaturePRE-START-UP Model no Serial no Date Technician

48MA/50ME016-040 specifications

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