Carrier Chillers 30XA

Check all electrical connections, tighten as necessary.

Inspect all contactors and relays, replace as necessary.

Check accuracy of thermistors, replace if greater than ±2° F (1.2° C) variance from calibrated thermometer.

Check accuracy of transducers, replace if greater than ±5 psi (34.47 kPa) variance.

Check to be sure that the proper concentration of antifreeze is present in the chilled water loop, if applicable.

Verify that the chilled water loop is properly treated.

Check refrigerant filter driers for excessive pressure drop, replace as necessary.

Check chilled water strainers, clean as necessary.

Check cooler heater operation, if equipped.

IMPORTANT: Obtain replacement gasket before opening EXV. Do not re-use gaskets.

Enter the type of new gasket used

Is the lead screw in the fully closed position?

Enter the torque applied to the motor (in ft-lb)

Did you tighten the valve another 30 degrees?

Is there a sign of moisture in the system?

Sign off on the EXV Motor Replacement

Check condenser coils for debris

Clean condenser coils as necessary following recommended guidelines

Check moisture indicating sight glass for possible refrigerant loss

Check moisture indicating sight glass for presence of moisture

Every 3 months (for all machines):

Check all refrigerant joints and valves for refrigerant leaks

Repair refrigerant leaks as necessary

Check chilled water flow switch operation

Send Oil Sample Out for Analysis

Check Condition of Condenser Fan Blades

General Cleaning and Tightening Connections

Check Chilled Water Flow Switch Operation

General Tightening and Cleaning Connections

CAUTION: Do not apply any chemical cleaners to MCHX condenser coils. These cleaners can accelerate corrosion and damage the coil.

Removal of any foreign objects or debris attached to the coil face or trapped within the mounting frame and brackets.

Proper personal protective equipment worn, including safety glasses and/or face shield, waterproof clothing and gloves.

High pressure water sprayer started and purged of any soap or industrial cleaners before cleaning condenser coils.

Condenser face cleaned by spraying the coil steady and uniformly from top to bottom while directing the spray straight toward the coil.

CAUTION: Excessive water pressure will fracture the braze between air centers and refrigerant tubes.

Check the coil for leaks and corrosion.

Enter the tightness of the nuts holding the dielectric coupling in place.

Sign off on the MCHX Condenser Coil Maintenance