Trane RTUB 207-224 manual Checking the separator oil level, Refrigerant and Oil-Charge Management

Maintenance

Checking the separator oil level

Figure 17 - System Oil Specifications

1 Oil separator

2 Valve

3 ¼" refrigeration hose

4 Sight glass

5 Minimum oil level

6 Maximum oil level

Some symptoms of a refrigerant under-charged unit:

•Low subcooling

•Larger-than-normal evaporator approach temperatures (Leaving- WaterTemperature - Saturated EvaporatorTemperature)

•Low Evaporator-Refrigerant Temperature Limit

•Low Refrigerant-Temperature Cutout diagnostic

•Fully-open expansion valve

•Possible whistling sound coming from liquid line (due to high vapor velocity)

•High Condenser + Subcooler Pressure drop

Some symptoms of a refrigerant over-charged unit:

Follow the steps listed below and refer to the notes listed in Figure 17.

1.Turn off the unit.

2.Attach the hoses and sight glass to the oil-separator Schrader valves, as shown in Figure 17. Remove non-condensables.

3.After the unit has been off for

10 minutes, move the sight glass up and down until the level can be seen.

4.After the level has been determined, remove the sight glass and hoses.

Refrigerant and Oil-Charge Management

Proper oil and refrigerant charge is essential for proper unit operation, unit performance, and environmental protection. Only trained and licensed service personal should service the unit.

•High subcooling

•Larger-than-normal condenser approach temperatures (Entering- Condenser SaturatedTemperature - Entering-AirTemperature)

•Condenser Pressure Limit

•High-Pressure Cutout diagnostic

•More-than-normal number of fans running

•Erratic fan control

•Higher-than-normal compressor power

•Very low discharge superheat at startup

•Compressor rattle or grinding sound at startup

Some symptoms of an oil over- charged unit:

• Larger-than-normal evaporator

approach temperatures (Leaving-

WaterTemperature - Saturated

EvaporatorTemperature)

• Low Evaporator-Refrigerant

Temperature Limit

• Low Refrigerant-Temperature

Cutout diagnostic

Table 5 - Oil level limit

Oil separator diameter (mm)

	152	203	254
Minimum oil level (mm)	90	120	145
Maximum oil level (mm)	155	205	235

• Low unit capacity

• Compressor rattle or grinding

sound

• High oil-sump level after normal

shutdown

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