Daikin MICROTECH III Operating Manual page 38

10.4.3 Evaporator Flow Loss
This alarm is generated in case of flow loss to the chiller to protect the machine against Mechanical High Pressure trips.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller's
display. String in the alarm list:
UnitOffCondWaterFlow String in the
alarm log:
UnitOffCondWaterFlow
String in the alarm snapshot
UnitOffCondWaterFlow
Reset
Local HMI
Network
Auto
10.4.4 Evaporator Water Freeze Protect
This alarm is generated to indicate that the water temperature (entering or leaving) has dropped below a safety limit.
Control tries to protect the heat exchanger starting the pump and letting the water circulate.
Symptom
Unit status is Off.
All circuits are stopped immediately.
Bell icon is moving on controller's
display. String in the alarm list:
UnitOffEvapWaterTmpLo
String in the alarm log:
UnitOffEvapWaterTmpLo
String in the alarm snapshot
UnitOffEvapWaterTmpLo
Reset
Local HMI
Network
Auto
D–EOMWC00A07-16_02EN
Cause
No water flow sensed for 3 minutes
continuously or water flow too low.



Cause
Water flow too low.
Inlet temperature to the evaporator is
too low.
Flow switch is not working or no water
flow.
Sensors readings (entering or leaving)
are not properly calibrated.
Wrong freeze limit setpoint.



Operation Manual
Solution
Check the water pump filler and the
water circuit for obstructions.
Check the flow switch calibration and
adapt to minimum water flow.
Check if pump impeller can rotate
freely and has no damages.
Check pumps protection devices
(circuit breakers, fuses, inverters,
etc.)
Check if water filter is clogged.
Check flow switch connections.
Notes
Solution
Increase the water flow.
Increase the inlet water temperature.
Check the flow switch and the water
pump.
Check the water temperatures with a
proper instrument and adjust the
offsets.
The freeze limit has not been changed
as a function of glycol percentage.
Notes
It's required to check if the evaporator
has any damage due to this alarm.
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