Circuit Pumpdown Stop Alarms - Daikin MICROTECH III Operating Manual

10.8.17 Maximum Number of Restart Alarm (condenserless units only)
This alarm indicates that for three consecutive times after the compressor start the evaporating pressure is under a
minimum limit for too much time
Symptom
Circuit status is Off.
The circuit is stopped.
Bell icon is moving on controller's
display.
String in the alarm list:
Cx OffNbrRestarts
String in the alarm log:
Cx OffNbrRestarts
String in the alarm snapshot
Cx OffNbrRestarts
Reset
Local HMI
Network
Auto

10.9 Circuit Pumpdown Stop Alarms

10.9.1 Low Discharge Superheat Fault
This alarm indicates that the unit has worked for too long with low discharge super heat.
Symptom
Circuit status is Off.
The circuit is switched off with the
shutdown procedure.
Bell icon is moving on controller's
display. String in the alarm list:
CxCmp1 OffDishSHLo
String in the alarm log:
CxCmp1 OffDishSHLo
String in the alarm snapshot
CxCmp1 OffDishSHLo
Reset
Local HMI
Network
Auto
57/77
Cause
Ambient temperature is too low.
Pressure drops between unit and
remote condenser exceeds the limit
for a proper operation.



Cause
EEXV is not working correctly.
It's not opening enough or it's moving
in the opposite direction.



Operation Manual
Solution
Check the operating envelope for this
machine.
Notes
Solution
Check if pump-down can be finished
for pressure limit reached;
Check expansion valve movements.
Check connection to the valve driver
on the wiring diagram.
Measure the resistance of each
winding, it has to be different from 0
Ohm.
Notes
D–EOMWC00A07-16_02EN