Carrier Compressor and Condensing Unit specifications Motor Removal, Motor Replacement

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Turn crankshaft to be sure there is no binding between bearing surfaces and journals. Replace oil screen, bottom cover plate, valve plates and cylinder heads.

 

 

DOWELS IN

DOWEL

 

CYLINDER DECK

HOLES

 

FOR SUCTION

 

DOWEL

VALVE AND BACKER

 

 

 

HOLES

 

 

BACKER

 

SUCTION

PLACE AGAINST

TOP VIEW OF PISTON

CYLINDER DECK,

IN CYLINDER

VALVE

UNDER SUCTION VALVE

 

 

 

Fig. 19 — Piston, Suction Valve and

Backer Positions

Motor Removal

MOTOR END BELL — Remove motor end bell carefully to prevent damage to the stator. Use three 7/16 - 14- x 5-in. studs for guides and support. Inspect suction strainer in end bell. Clean it with solvent or replace if broken or corroded.

REMOVE ROTOR — Bend rotor lock washer tab backward and remove rotor lock bolt. If crankshaft turns, preventing lock bolt from being loosened, remove a cylinder head and valve plate and place a rubber plug (06R suction plug) on top of one piston (Fig. 20). Replace valve plate assembly and cylinder head (only 2 bolts required to hold cylinder head in place). Pro- ceed to remove rotor lock bolt, lock washer and plate washer.

Use a jackscrew to remove rotor (Fig. 20). Insert a brass plug into rotor hole to protect end of crankshaft from jack- screw. Support rotor while it is being removed to prevent stator damage. Remove ring spacer between rotor and crankshaft (if used).

Clean rotor thoroughly with solvent. If stator is to be replaced, a matching rotor must be used.

REMOVE STATOR (Fig. 21) — Stator is a slip fit in motor housing. It is held in place by both an axial key and a locking assembly consisting of an acorn nut, locking pin, motor lock bushing and a washer (see Fig. 21). Remove acorn nut and washer. Back out locking pin and bushing and slide stator out. Axial key positions stator and crankcase. If necessary, heat crankcase motor housing (not over 20 to 30 F above stator temperature).

Check stator for damage to windings and lead wires. Use a megohmmeter to check for grounds or shorts between windings.

Motor Replacement

STATOR AND ROTOR — Install stator halfway into hous- ing. Insert the terminal leads first, guiding them to terminal plate opening as stator is being inserted.

Replace ring spacer (Fig. 11, item 21) on crankshaft. Ease rotor onto shaft until it begins to feel snug. Insert rotor key, and push rotor the remainder of the way on shaft. Replace rotor lock bolt with lockwasher and plate washer.

Do not push stator in completely until rotor is in place.

Push stator into housing until it lines up correctly with rotor (Fig. 22).

Line up keyways in stator and crankcase and replace stator locking assembly, then drive key into keyway and stake over keyway in stator to secure key. When a new motor is being installed, the stator must be drilled and a new locking pin and motor lock bushing used (see Fig. 23 and instructions). Connect stator leads to proper terminals on terminal plate. Refasten terminal plate and junction box to compressor. Replace motor end bell using studs for support. Remove rubber plug (if used) from piston head. Replace valve plate assembly, cylinder head, and terminal plate assembly. Torque 12 bolts holding terminal plate to crankcase at 30 to 40 lb-ft.

VALVE PLATE

RUBBER PLUG

STATOR LOCKING

ASSEMBLY

STATOR

ROTOR

JACKSCREW

ROTOR LOCK BOLT

Fig. 20 — Removing Rotor

LOCKING PIN BOSS

STATOR

 

KEY

ACORN

MOTOR LOCK

NUT

BUSHING

 

WASHER

LOCKING PIN

Fig. 21 — Removing Stator

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Contents Safety Considerations ContentsInstallation Electrical Connections 07E Water-Cooled Condensing Units Unit 07E Volts06E Hermetic Compressor Units Electrical Data Compressor Motor With Circuit Breaker DTS AUXLLS PRE-START-UP 06E Physical DataUnit 06E Refrigerant07E Physical Data START-UPUnit 07E Service Factory Switch SettingsProtection Devices Capacity Control SystemRemoving, Inspecting and Replacing Components Fig Capacity ControlNO. ContrSuction Cutoff Unloader Operation Compressor Components 06E Shown Lubrication System Torque ValuesSuction and Discharge Valve Plate Assembly Compressor Running Gear RemovalCompressor Running Gear Replacement Wear Limits 06E CompressorMotor Replacement Motor RemovalMotor Alignment Forced Circulation Page Copyright 2001 Carrier Corporation