Carrier Compressor and Condensing Unit specifications Motor Alignment

END

STATORTURN

END

RING

ROTOR

ROTOR CENTER LINE

Fig. 22 — Motor Alignment

PEENED ENDS

BUSHING	ACORN NUT
LOCKING PIN
	WASHER
	COMPRESSOR
2 1/16"	CASTING

STATOR CORE

3/8"

Fig. 23 — Stator Locking Assembly

Remove

1.Acorn nut and washer.

2.Back out locking pin and bushing. Replace

1.Screw in locking pin bushing until it rests on stator core.

2.Wrap a piece of tape around 3/8-in. drill bit, 21/16 in. from cutting edge.

Before drilling, be sure stator vent holes do not line up with locking pin hole. Vent holes are drilled horizontally through stator, and can be seen from end bell side.

3.Ream out bushing (3/8-in. drill) and drill into stator core until tape is flush with top of bushing. (Remove drill chips.) Back off locking pin bushing 1/8 of a turn.

4.Tap locking pin into position. (Top of bushing should be approximately 1/16 in. above top of pin.)

5.Peen top of bushing over roll pin.

6.Replace washer and acorn nut.

Motor Burnout (Clean-Up Procedure) — When a hermetic motor burns out, the stator winding decomposes forming carbon, water and acid which contaminate refrigerant systems. Remove these contaminants from system to prevent repeat motor failures.

1.Close compressor suction and discharge service valves, and bleed refrigerant from compressor. Save remaining refrigerant in system.

2.Remove burned motor from compressor, and drain com- pressor oil. Clean crankcase and motor housing with solvent. Ensure that all metal particles are wire-brushed free and removed.

On severe burnouts, disassemble compressor heads and valve plate assemblies. Clean them in same manner as crankcase and motor housing.

3.Determine cause of burnout and remedy. Check control box for welded starter contacts, welded overload contacts or burned out heater elements. Check terminal plate for burned or damaged terminals, insulation, and shorted or grounded terminals.

4.Reassemble compressor with new stator and rotor. Install new liquid line filter drier, and place new oil charge in crankcase.

5.Evacuate and dehydrate compressor.

Do not attempt start-up with terminal cover removed. Bodily injury or death may result from explosion and/or fire if power is supplied to compressor with the terminal cover removed or unsecured. See warning label on termi- nal cover.

6.Place compressor in operation. After 2 to 4 hours of operation, check compressor oil for discoloration and/or acidity. If oil shows signs of contamination, replace oil charge, filter driers, and clean suction strainer with solvent.

7.Check oil daily for discoloration and acidity. If oil stays clean and acid-free, the system is clean. If oil shows signs of contamination, change oil, filter drier, and clean suction strainer. If filter drier or suction strainer is dirty or discolored, repeat this step until system is clean.

Condenser Maintenance (07E Units) — To inspect and clean condenser, drain water and remove condenser heads. To drain condenser, shut off water supply and disconnect inlet and outlet piping. Remove drain plugs and vent plug.

With condenser heads removed, inspect tubes for refrigerant leaks. (Refer to Carrier Standard Service Techniques Manual, Chapter 1, Section 1-6, Leak Testing, for instructions.)

Clean condenser tubes with nylon brush (available from Carrier Service Department). Flush water through tubes while cleaning. If hard scale has formed, clean tubes chemically. Do not use brushes that will scrape or scratch tubes.

Because the condenser water circuit is usually an open system, the condenser tubes may be subject to contamination by foreign matter. Local water conditions may cause excessive fouling or pitting of tubes. Condenser tubes, therefore, should be cleaned at least once a year or more often if the water is contaminated.

Proper water treatment can minimize tube fouling and pitting. If such conditions are anticipated, water treatment analysis is recommended. Refer to the Carrier System Design Manual, Part 5, for general water conditioning information.

If hard scale has formed, clean the tubes chemically. Con- sult an experienced and reliable water treatment firm in your area for treatment recommendations. Clean the condenser by gravity or by forced circulation as shown in Fig. 24 and 25.

IMPORTANT: If the ambient temperature is below 32 F during a shutdown period, protect the condenser from freezing by draining the water from the system or by add- ing antifreeze to the water.

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