Trane RAUC-C20, RAUC-C50, RAUC-C30 Compressor Oil, System Start-Up, Compressor Crankcase Heaters

System Start-Up

14.Turn the 115-volt control circuit switch 1S2 to the “OFF” position and open the field provided or optional factory mounted disconnect switch.

15.After shutting the system off, check the compressor oil appearance. Discoloration of the oil indicates that an abnormal condition has occurred. If the oil is dark and smells burnt, it has overheated because of: compressor is operating at extremely high condensing temperatures; high superheat; a compressor mechanical failure; or, occurrence of a motor burnout.

If the oil is black and contains metal flakes, a mechanical failure has occurred. This symptom is often accompanied by a high compressor amperage draw.

If a motor burnout is suspected, use an acid test kit to check the condition of the oil. Test results will indicate an acid level exceeding 0.05 mg KOH/g if a burnout occurred.

Compressor Oil

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.

Compressor Crankcase Heaters

9 and 10 ton scroll compressors have a 100-watt heater installed. 14 and 15 ton scroll compressors have two 80-watt heaters installed per compressor.

Table 13. Pressure Control Switch Settings

Pressure Switch	Make	Break
Hi Pressure	350 psi	405 psi
Lo Pressure
EVPB	60 psi	45 psi
All others	40 psi	30 psi
Condenser Fan Cycling switch	275 psi	155 psi
(EVP only w/HGB - wo/HGB) std.
Lo Ambient Thermostat	33 F	30 F
Compressor Winding T-Stat	181F	221 F

Note: Pack Stock units will have both low pressure switches shipped and the user should use the above valves that apply

Table 14. Recommended Refrigerant Capacities

			Total Interconnecting Line Length
Capacity		50	100	150
	Approximate Total System Refrigerant Charge (Lbs. Per Circuit)

20Ton

25Ton

30Ton

40Ton

50Ton

60Ton

49	56	64
58	73	87
71	85	99
46	53	61
56	70	85
68	82	97

Table 15. Minimum starting Ambient Temperature

Minimum Starting Ambient (1)

Standard Units Low Ambient Units

SS-SVX09A-EN 93