Check Condenser Motor Relay
refrigeration
Description
The condenser motor relay output and relay feedback voltage do not match, and the unit alarms only.
Activation Conditions
Trigger On Condenser Motor Relay is ON and Relay Feedback Voltage is below Minimum ON Threshold OR Condenser Motor Relay is OFF and Relay Feedback Voltage is above Maximum OFF Threshold. Trigger Off If alarm was active when Condenser Motor Relay was ON, trigger OFF if Output is ON and FET Feedback Voltage is sensed in Active range OR If alarm was active when Condenser Motor Relay was OFF, trigger OFF if Output is OFF and FET Feedback Voltage is sensed in Inactive range OR Alarm Reset OR Cycle Power
Unit Behavior
Alarm only
Reset Conditions
Alarm reset OR Cycle Power
Corrective Actions
1. Open Cabin Tech system values and verify if 00075 occurs when condenser motor is ON or OFF. If ON go to step 2. If Off go to step 3 2. Verify condenser fan is running and turning in the correct direction. Air should be blowing out of fan. If condenser fan is running and in correct direction go to step 3 3. Disconnect CDM connector and measure resistance between A and B. Is resistance between? Yes step 4 NO replace fan 4. Disconnect CCU J-8 and install jumper wire between A and B of CDM harness connector. Is resistance < 1.0 Ω? If no repair/replace harness. If YES recheck connections and replace CCM