10.10.2 High Condenser Pressure – Hold/Unload
These events are generated to indicate a temporary condition with the condensing pressure above the hold and unload
limits.
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
One or more condenser fans do not
operate properly (Condenserless
units).
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.
Condenser pump may not be
operating correctly.
Check if the pump can run and give
the required water flow.
Dirty or partially blocked condenser
coil (Condenserless units).
Remove any obstacle;
Clean the condenser coil using soft
brush and blower.
Dirty condenser heat exchanger.
Clean the condenser heat exchanger.
Inlet air temperature of the condenser
is too high (Condenserless units).
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).
Entering water temperature at
condenser is too high.
Check the cooling tower operation
and settings.
Check the three way valve operation
and settings.
One or more condenser fan turning in
wrong direction (Condenserless
units).
Check for correct phases sequence
(L1, L2, L3) in the electrical
connection of the fans.
Excessive charge of
refrigerant into the unit.
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.
Condensing pressure transducer
could not operate properly.
Check for proper operation of the high
pressure sensor.
Wrong unit configuration.
Check that the unit has been
configured for high condenser
temperature applications.
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