ROTARY COMPRESSOR SPECIAL TROUBLESHOOTING AND SERVICE
Basically, troubleshooting and servicing rotary com- pressors is the same as on the reciprocating compres- sor with only a few exceptions.
1.Because of the spinning motion of the rotary, the mounts are critical. If vibration is present, check the mounts carefully.
2.The electrical terminals on the rotary are in a different order than the reciprocating compressors. The terminal markings are on the cover gasket. Use your wiring diagram to insure the correct connections.
REFRIGERANT CHARGE
1.The refrigerant charge is extremely critical. Measure the charge carefully and as exactly as possible to the nameplate charge.
2.The correct method for charging the rotary is to introduce liquid refrigerant into the high side of the system with the unit off. Then start the compressor and enter the balance of the charge, gas only, into the low side.
The introduction of liquid into the low side, without the use of a capillary tube, will cause damage to the discharge valve of the rotary compressor.
NOTE:
All inoperative compressors returned to Friedrich must have all lines properly plugged with the plugs from the replacement compressor.
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