Operating and service manual
156 of 222 pages
845
Cpr pump down
Alarm
Description
Compressor pump down fault
Cause
Indication of insufficient performance in the compressor
Trouble
shooting
Possible causes:
•
Sensor defect (high pressure transmitter and or high pressure switch)
•
One or more valves defect.
•
Compressor needs repair.
Accompanied alarms:
•
AL 250
Trouble shooting:
1) If alarm 250 is displayed check the high pressure transmitter settings and
the high pressure switch.
2) If only alarm 845 is displayed, check that there is sufficient refrigerant on
the unit.
3) If only alarm 845 is displayed, replace compressor valve plates.
Criteria
Tc – T0 more than (>) 20°C.
Controller
action
None
Log
X
Alarm
X
Alarm light
Slow flash
Consequence
Test failed
Elimination
Alarm may then be deleted after test completed
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive T0
T0 diff.
Pdis
Pdis old
846
FC Check
Alarm
Description
Internal fault in FC
Cause
Indication of internal failure in the FC
Trouble
shooting
Possible causes:
•
Internal failure in the FC
Accompanied alarms:
•
N/A.
Trouble shooting:
1) Check and clear other alarms first.
2) Check that FC cover is mounted correctly with all screws.
3) Check motor cable (Connection cable between FC and compressor).
4) The FC needs repair and should be replaced
Criteria
FC temperature not increased by 15°C within 5 min. during step 8 of Function test
Controller
action
None
Log
X
Alarm
X
Alarm light
Slow flash
Consequence
Test failed
Elimination
Alarm may then be deleted after test completed
Log data
Parm 1
Parm 2
Parm 3
Parm 4
Parm 5
Active/Inactive FC temp
Tdiff
Umotor
Current