Carrier Container Refrigeration Unit 69NT40-511-19

Prepare an ice-water bath at 0°C (32°F)

Ensure the ohmmeter is calibrated and ready for use

Sensor Placement and Initial Check

Place the sensor in the ice-water bath

Check air temperature/data readout on the control panel

Is the air temperature/data readout 0°C (32°F)?

Handling of Controller/DataCORDER

Ensure all safety precautions are followed

Obtain a grounding wrist strap and a static dissipation mat

Disconnect and secure power to the unit

Place strap on wrist and attach the ground to an unpainted metal area

Carefully remove the Controller/DataCORDER and place it on the static mat

Remove ground strap if servicing the refrigeration unit

Re-install the module into the refrigeration unit after service

Removing and Installing the Controller/DataCORDER Module

Ensure no refrigerants are mixed with air for leak testing

Use R-134a electronic leak detector for finding leaks

Test joints with soapsuds for large leaks

Charge the system with refrigerant to build up pressure

Remove refrigerant cylinder after pressurization

Verify correct refrigerant cylinder is used

Select the method for temperature stabilization

Set the unit's set point to 0°C (32°F)

Allow the unit to pull down to 0°C (32°F)

Enter the number of compressor ON-OFF cycles observed

Record the temperature indicated by the resistance thermometer

Does the temperature differ from 0°C (32°F) by more than 0.6°C (1°F) when compressor cycles off?

When to check for a defective capacitor

Does the fan motor fail to change speed according to controller settings?

Is the motor running in the wrong direction after checking for correct wiring?

Ensure power to the unit is OFF and power plug is disconnected.

Choose the method for removing the capacitor

Discharge the capacitor and disconnect the circuit wiring.

Use a volt-ohmmeter to check the capacitor's resistance.