Trane RAUC-C60 manual Compressor Operational Sounds, Scroll Compressor Replacement, At Shutdown

Service & Maintenance

Compressor Operational Sounds

Because of the scroll compressor design, it emits a higher frequency tone (sound) than a reciprocating compressor. It is designed to accommodate liquids, both oil and refrigerant, without causing compressor damage. The following discussion describes some of the operational sounds that differentiate it from those typically associated with a reciprocating compressor. These sounds do not affect the operation or reliability of the compressor.

At Shutdown:

When a Scroll compressor shuts down, the gas within the scroll expands and causes momentary reverse rotation until the discharge check valve closes. This results in a “flutter” type sound.

At Low Ambient Start-Up

When the compressor starts up under low ambient conditions, the initial flow rate of the compressor is low due to the low condensing pressure. This causes a low differential across the thermal expansion valve that limits its capacity. Under these conditions, it is not unusual to hear the compressor rattle until the suction pressure climbs and the flow rate increases.

Scroll Compressor Replacement

Table 19 lists the specific compressor electrical data and the circuit breaker operating ranges.

The compressor manifold system was purposely designed to provide proper oil return to each compressors. The refrigerant manifolded system must not be modified in any way.

NOTICE

Altering the manifold piping may cause oil return problems and compressor failure.

Should a compressor replacement become necessary and a suction line filter drier is to be installed, install it a minimum of 18 inches upstream of the oil separator tee. Refer to the illustration in Figure 53.

Anytime a compressor is replaced, the oil for each compressor within the manifolded set must be replaced.

The scroll compressor uses Trane OIL-42 without substitution. The appropriate oil charge for a 9 and 10 Ton scroll compressor is 8.5 pints. For a 14 and 15 Ton scroll compressor, use 13.8 pints.

Note: Do Not release refrigerant to the atmosphere! If adding or removing refrigerant is required, the service technician must comply with all Federal, State and local laws. Refer to general service bulletin MSCU-SB-1 (latest edition).

NOTICE

Refrigerant oil is detrimental to some roofing materials. Care must be taken to protect the roof from oil leaks or spills.

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