Trane Series R™ Helical Rotary Chiller RTAC140H

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?

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

Isolate the refrigerant charge outside of the compressor and close all four valves leading to the compressor?

Disconnect power to the chiller. Remove the electrical junction box cover and disconnect the wires?

WARNING: Hazardous Voltage! Disconnect all electric power, including remote disconnects before servicing. Follow proper lockout/tagout procedures to ensure the power can not be inadvertently energized. Failure to disconnect power before servicing could result in death or serious injury.

Evacuate the compressor through the service fitting provided. If the unit does not have suction service valves, this will include evacuating the low side of the system as well?

Disconnect all four lines attached to the compressor, as well as the junction box. Remove three screws from the bottom of the compressor?

Remove the compressor by sliding it out of the chiller onto a well supported skid or other platform. The compressor is very heavy, so insure that the support is sturdy. A piece of 1x4 lumber placed between the isolators works well to support the compressor feet as it is pulled from the chiller?

Install the new compressor. Reinstall all lines, wires, and screws. Open the service valves, and trim charge as required?

Sign off on the compressor replacement

Manually open EXV for 15 minutes to allow refrigerant to drain to evaporator by gravity (ensure water is flowing in the evaporator prior to opening the EXV)

Let unit sit with heaters on to drive refrigerant out of oil and warm up compressor bearings. Depending upon ambient conditions, this may take up to 24 hours.Ensure the UCM is powered so the pump may be energized if it detects a freeze condition

Once the oil level has returned to normal, the unit can be put back into operation

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