Trane Series R™ Helical Rotary Chiller RTAC350H

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!

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.

Oil charging port used to add oil into the compressor?

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.

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

Secure the isolators to the mounting surface using the mounting slots in the isolator base plate. Do not fully tighten the isolator mounting bolts at this time.

Align the mounting holes in the base of the unit with the threaded positioning pins on the top of the isolators.

Lower the unit onto the isolators and secure the isolator to the unit with a nut. Maximum isolator deflection should be 1/4 inch (6 mm).

Level the unit carefully. Fully tighten the isolator mounting bolts.

Sign off on the isolator replacement

CAUTION: Evaporator Damage! Water must be flowing through the evaporator during the entire charging process to avoid freezing and rupturing of the evaporator tubes. Charge first with vapor to avoid freezing tubes.

Note the weight of the amount of charge removed

Compare the weight of the charge removed to Table 1 - Table 4. Is there a difference in charge?

If there is a difference in charge, this may indicate a leak.

Attach a photo of the attached charging hose to the evaporator service valve (3/8” (9mm) flare)

Add charge to evaporator to bring total circuit charge up to the level indicated in the above chart.

Attach a photo of the disconnected charging hose.