Carrier Split Systems and Condensers 38AP

Check condenser coils for debris, clean as necessary.

Check moisture indicating sight glass for possible refrigerant loss and presence of moisture.

Check fusible plugs to be sure that they have not been capped. If the fusible plugs are vented, be sure the vent line is free of any obstructions.

For units with High Efficiency Variable Condenser Fan option, check the VFD fan inlet for debris, snow, or ice. Clean as necessary.

WARNING: Electrical shock can cause personal injury. Disconnect all electrical power before servicing.

All wires from the defective module are carefully disconnected

Defective module is removed from the control box

Instance jumper or address switches match the settings of the defective module

Defective module is packaged in the carton of the new module for return to Carrier

New module is mounted in the unit’s control box using the saved screws

All module connectors are reinstalled

All wiring connections are carefully checked before restoring power

Check all refrigerant joints and valves for refrigerant leaks, repair as necessary.

Check fan status switch operation.

Check condenser coils for debris.

Check all condenser fans for proper operation.

Check crankcase heater operation.

For units with High Efficiency Variable Condenser Fan option, check the VFD fan filter. Clean if necessary.

Disconnect and lock out the high voltage and control voltage supply to the unit.

Using a straight blade screwdriver, carefully depress the tabs holding the terminal cover to the terminal box to remove the terminal cover.

Use a volt meter to verify that the power has been disconnected from the unit.

Using wire markers, label the M1, M2, T1, and T2 wires that are connected to the Kriwan module.

Using needle nose pliers, remove the M1, M2, T1, T2, S1 and S2 wires from the Kriwan motor protector module.

Gently bend the holding tabs holding the Kriwan module in the terminal box and remove the Kriwan module from the terminal box.

Take note of the S1-S2 plug orientation on the compressor thermistor fusite.

Remove the S1-S2 wire harness and plug from the compressor.

Sign off on the Kriwan Motor Protection Module Replacement

Warning: This maintenance check requires trained personnel with PPE!

Surface loaded fibers or dirt removed with a vacuum cleaner or a soft non-metallic bristle brush?

Note: Use of a water stream, such as a garden hose, against a surface loaded coil will drive the fibers and dirt into the coil.

Surface loaded fibers completely removed prior to using low velocity clean water rinse?

Periodic clean water rinse performed with very low velocity water stream?

Monthly cleaning as described below is recommended.

Routine cleaning with Totaline® environmentally balanced coil cleaner performed?

Enter the part number of the Totaline environmentally balanced coil cleaner used

Avoid the use of coil brighteners, acid cleaning prior to painting, high pressure washers, poor quality water for cleaning.