Daikin MICROTECH III Operating Manual page 61

High Condenser Pressure – Hold/Unload
10.10.2
These events are generated to indicate a temporary condition with the condensing pressure above the hold and unload
limits.
Symptom
Circuit status is
Run: High Cond Press
The compressor does not load
anymore or even unload.
String in the Event log:
CxCmp1 HiCondPrHold
CxCmp1 HiCondPrUnld
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Cause
One or more condenser fans do not
operate properly (Condenserless
units).
Condenser pump may not be
operating correctly.
Dirty or partially blocked condenser
coil (Condenserless units).
Dirty condenser heat exchanger.
Inlet air temperature of the condenser
is too high (Condenserless units).
Entering water temperature at
condenser is too high.
One or more condenser fan turning in
wrong direction (Condenserless
units).
Excessive charge of
refrigerant into the unit.
Condensing pressure transducer
could not operate properly.
Wrong unit configuration.
Operation Manual
Solution
Check if fans protections have been
activated.
Check that the fans can turn freely.
Check that there is not any obstacle
to the free ejection of the air blown.
Check if the pump can run and give
the required water flow.
Remove any obstacle;
Clean the condenser coil using soft
brush and blower.
Clean the condenser heat exchanger.
The air temperature measured at the
inlet of the condenser may not
exceed the limit indicated in the
operational range (working envelope)
of the chiller.
Check the location where the unit is
installed and check that there are no
any short circuit of the hot-air blown
from the fans of the same unit, or
even from fans of next chillers
(Check IOM for proper installation).
Check the cooling tower operation
and settings.
Check the three way valve operation
and settings.
Check for correct phases sequence
(L1, L2, L3) in the electrical
connection of the fans.
Check liquid sub-cooling and suction
super-heat to control indirectly the
correct charge of refrigerant.
If necessary recover all the
refrigerant to weight the entire charge
and to control if the value is in line
with kg indication on unit label.
Check for proper operation of the high
pressure sensor.
Check that the unit has been
configured for high condenser
temperature applications.
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