Trane Series R™ Helical Rotary Chiller RTAC400S

Suction line isolation valve is closed

Oil return line service valve is closed

Liquid line service valve is closed

Refrigerant moved from the condenser to evaporator using a liquid pump or vacuum pump

NOTE: If a pump is to be used, connect it before closing this valve. This port is only isolated when the valve is back seated. If a vacuum pump is used, then connect it to the discharge line service valve near the oil separator.

Evaporator is large enough to hold all the charge for any unit to below the center-line of the shell

Sign off on the Low Side Charge Isolation procedure

Perform all weekly maintenance procedures

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.

While unit is running in stable conditions.

Check MP pressure for evaporator, condenser and intermediate oil.

Observe liquid line sight glass on EXV.

If liquid line sight glass has bubbles measure the subcooling entering the EXV. The subcooling should never be less than 4 °F under any circumstances.

A clear sightglass alone does not mean that the system is properly charged. Also check the rest of the system operating conditions.

Inspect the entire system for unusual conditions and inspect the condenser coils for dirt and debris. If the coils are dirty, refer to coil cleaning.

Sign off on the weekly maintenance

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