Dometic PGD1 - Page 42

42
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Troubleshooting VARC Chiller Controls
Alarm Reset Delay
Alarm
Relay
System Action Corrective Actions
Chilled Water Supply
Sensor Failure
Manual Immediate Yes Turns off VARC • Check the sensor for shorts
and opens.
• Compare the temperature
reading with the digital
thermometer.
Clock Board Fault or
Not Connected
Automatic Immediate Ye s Warning signal
Compressor Start
Failure
Aer 5 times
in 60 minutes,
must be reset
manually
10 sec Warning signal • Compare the voltage to the
compressor.
• Check the power inverter.
Condenser Out
Temperature Sensor
Failure
Manual Immediate Warning signal • Check the sensor for shorts
and opens.
• Compare the temperature
reading with the digital
thermometer.
Electric Heat Run
Hours Exceeded
Yes Turns off heater Check heater the voltage.
Envelope Alarm Manual 60 sec Yes Turns off compressor
EVD Evo High
Evaporation
Temperature (MOP)
Automatic Immediate Ye s Warning signal Check the refrigerant charge.
EVD Evo Low
Evaporation
Temperature (LOP)
Automatic Immediate Ye s Warning signal • Check the water flows.
• Check the refrigerant charge.
EVD Evo Low Suction
Temperature
Automatic Immediate Ye s Warning signal Check the refrigerant charge.
EVD EVO Low
Superheat
Automatic Immediate Ye s Warning signal • Check for proper refrigerant
charge as the system may be
overcharged.
• Check the water for low flow.
• Check the EEV movement
and functionality.
EVD Evo Probes fault
or disconnected (S1,
S2, S3, S4)
Automatic Immediate Ye s Turns off compressor Check the condition of the wiring
and connections.
Frost Active Manual Immediate Yes Slows down
compressor
• Low temperature temp switch
tripped.
• Check the water flows.
• Check r the efrigerant charge.
High Discharge Gas
Temperature
Automatic 30 sec Warning signal Check for the proper refrigerant
pressure with the gauge.