Trane Series R™ Helical Rotary Chiller RTAC250S

Attach vacuum hoses to evaporator service valves (one per circuit)

Attach charging hoses to the charging port on the liquid line filter (one per circuit)

Begin semi-automatic vacuum procedure

When vacuum is complete (indicated), manually isolate the unit from vacuum

Charge unit through the filter housing port per Table 1 - Table 4

When charging is complete, shut evaporator service valve

Disconnect vacuum and charging hoses

Warning: This procedure requires trained personnel with PPE!

This procedure is used 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.

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, simply replace the oil that was removed into the serviced component prior to vacuum and recharge of the refrigerant.

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

Is the compressor a new compressor or has been removed from the system and reworked?

Add 1 quart (2 lb.) oil to the motor cavity prior to installing the compressor into the chiller.

Is the compressor installed in the system?

Is the filter shut off valve closed?

Proper oil and refrigerant charge is essential for proper unit operation, unit perfor-mance, and environmental protection. Only trained and licensed service personnal should service the chiller.

Some symptoms of a refrigerant under-charged unit:

• Higher than normal discharge superheat

• Larger than normal evaporator approach temperatures (leaving water temperature - saturated evaporator temperature)

• Low evaporator refrigerant temperature limit

• Low refrigerant temperature cutout diagnostic

Liquid line service valve is shut

Oil return line service valve is shut

Circuit started with the service tool (access compressor service view in Techview)

Discharge check valve closed after unit trip

Discharge isolation valve is closed

Oil line shut off valve is closed

Refrigerant remainder recovered

NOTE: Remaining vapor can be recovered/stored in the high side of the system. Be certain to follow proper recovery procedures to avoid introduction of non-condensable gases.

Warning: This procedure requires trained personnel with PPE!

Is the unit new or has had all of the oil removed?

If the unit is not new or has not had all of the oil removed, report the issues to the maintenance team and stop the procedure

High side of the system not pressurized?

The oil charging port is a ¼” (6mm) flare fitting with a schrader valve that is on the side of the oil filter housing.

Choose the method of oil charging

CAUTION: Use only Trane OIL00048 in the RTAC units to avoid any catastrophic damage to the compressor or unit.