Trane RTCA 108-216 manual Field Oil-Charging Procedure, Factory initial Oil-Charging Procedure

Maintenance

Factory (initial) Oil-Charging Procedure

The initial charging procedure should be followed any time the unit is new or has had all of the oil removed.

1.Add 0.95 liter (0.90 kg) of oil to the motor cavity or suction line prior to installing the compressor into the chiller.

2.If the unit is not equipped with suction-line isolation valves, it should contain no charge. If it has isolation valves, then the charge may be trapped in the evaporator. In either case, the high side of the system should not be pressurized.

3.The oil-line shutoff valve must be open to allow the oil to pass into the oil lines and the oil separator.

4.The oil charging port is a ¼"

[6 mm] flare fitting with a Schrader valve that is on the side of the oil- filter housing.This is the port that must be used to add oil into the compressor so that the filter and lines are full at the first start of the compressor.

5.On single-compressor circuits, all the oil should be put into the circuit through the oil-charging port on the compressor filter housing. On two-compressor circuits, put approximately ½ of the oil into the unit through each of the two oil-charging ports on the two compressors.

6.Oil may be put into the unit using either of two methods:

￿CAUTION

Use onlyTrane OIL 00048 in the units to avoid any catastrophic damage to the compressor or unit.

•Have the unit in vacuum. Note that the vacuum connection should be made on the unit at the service valve that is on the discharge line. Hook up one end of the oil-charging hose to the oil-charging fitting and immerse the other end into the oil container. Let the vacuum draw the required amount of oil into the unit.

•Have the unit at the same pressure as the oil. Hook up one end of the

oil-charging hose to the oil- charging fitting and the other end to an oil pump. Use the pump to draw oil out of the oil container and push the required amount of oil into the unit. Note: the compressor filter has an internal shutoff valve that will prevent oil from entering the compressor while the compressor is not running. Therefore, there is no concern about flooding the compressor with oil.

Field Oil-Charging

Procedure

Use the initial charging procedure under the following circumstances:

•When virtually all of the oil has been removed.

•If the oil charge is removed from the compressor and oil system only, but the unit has been run for less than 15 minutes.

•If the oil charge is removed from the compressor and oil system only, and the unit has been run for more than 15 minutes.

However, reduce the amount of oil added to the unit by the normal quantity of oil in the refrigeration system.

Note: this procedure can be followed even with the refrigerant charge isolated in the evaporating section of the unit.

If small quantities of oil were removed to service refrigeration components, such as the evaporator, replace the oil that was removed back into the serviced component prior to vacuum and recharge of the refrigerant.

If oil was removed to service a compressor or change the filter follow this procedure:

1.If the compressor is a new compressor or has been removed from the system and reworked, add 0.95 liter (0.90 kg) of oil to the motor cavity prior to installing the compressor into the chiller.

2.Install the compressor in the system. Make sure that the filter

shutoff valve is closed. Other compressor isolation valves may also be closed depending upon the service that was completed.

For example, changing the oil filter would require the compressor to be isolated and pulled into vacuum.

Note: Ensure that the compressor is not pressurized.

3.Open the flare fitting on the oil-line shutoff valve.

4.Open the flare fitting on the filter housing.This is the port that must be used to put oil into the compressor.

5.Install one end of the charging hose on the oil charging port (with the Schrader valve) and the other on the oil canister.

6.Lift the oil canister, or use a pump, to pour oil into the filter housing.

7.When oil comes out of the flare fitting on the oil-line shutoff valve, the filter is full. Stop adding oil.

8.Put the cap on the flare on the oil- line shutoff valve, remove the charging hose, and put the cap back on the flare on the filter housing.

9.Vacuum the compressor (low side) and prepare it for inclusion in the system.There is a service valve on the suction line and on the evaporator. Use these valves to vacuum the compressor.

10.Open the oil-line shutoff valve. Severe damage to the compressor can result if the oil- line shutoff valve is closed when the compressor is started.

￿CAUTION

Catastrophic damage to the compressor will occur if the oil-line shutoff valve or the isolation valves are left closed on unit startup.

11.Open the other compressor isolation valves.

Note: this procedure assumes that the oil that is put into the filter housing does not have contaminants such as non- condensable gases.The oil forces these gases out of the filter

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