Dometic VARC 48, Operation Manual

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61
Appendix V Alarm Table
Alarm description Reset Delay
Alarm
relay
System Action Corrective Action
Chilled Water Supply Sensor
Failure
Manual Immediate Yes Shuts off Unit
Check sensor for shorts and opens and
compare temperature reading with digital
thermometer
Chilled Water Return Sensor
Failure
Manual Immediate Yes Shuts off Unit
Check sensor for shorts and opens and
compare temperature reading with digital
thermometer
Sea Water Inlet Sensor
Failure
Manual Immediate Yes Warning Signal
Check sensor for shorts and opens and
compare temperature reading with digital
thermometer
Chilled Water Supply High Manual 10 sec Yes
Turns off
compressor or
heat relay
Check for low water flow due to restrictions or
pump wear
Chilled Water Supply Low Manual 10 sec Yes
Turns off
compressor or
heat relay
Check for low water flow due to restrictions or
pump wear
Sea Water Inlet Low Manual 10 sec Yes Warning Signal Low temperature due to geographical climate
Chilled Water Flow
After 3
retries every
30 mins,
must be
reset
Manually
Immediate Yes
Turns off
compressor or
heat relay
Check for proper loop water flow and make
sure strainers are not clogged.
Check for defective flow switch
Bleed air out of the loop water
Check loop water pump
High Discharge Pressure
After 3
retries every
30 mins,
must be
reset
Manually
Immediate Yes Shut off Unit
Check for proper refrigerant pressure with
gauge, if normal then check for defective
pressure switch.
Assure proper sea water and loop water flow
and make sure water strainers are not
clogged.
Ensure system is not overcharged.
Low Suction Pressure
After 3
retries every
30 mins,
must be
reset
Manually
60 sec Yes Shut off Unit
Check for proper refrigerant pressure with
gauge, if normal then check for defective
pressure switch.
Assure proper sea water and loop water flow
and make sure water strainers are not
clogged.
Ensure system is not undercharged.
Low Pressure Differential Check EEV motor
Compressor Start Failure
After 5 times
in 60 mins
must be
reset
Manually
10 sec Warning Signal
Check voltage to compressor.
Check Power inverter.
Condenser Out
Temperature Sensor Failure
Manual Immediate Warning Signal
Check sensor for shorts and opens and
compare temperature reading with digital
thermometer
High Discharge Gas
Temperature
Automatic 30 sec Warning Signal
Check for proper refrigerant pressure with
gauge
EVD Evo Probes fault or
disconnected (S1,S2,S3,S4)
Automatic Immediate Yes Off compressor Check condition of the wiring and connections