Trane CenTraVac Duplex CDHF Operation & Maintenance Manual page 79

CDHF-SVU01C-EN
Machine Protection
and Adaptive
Control
Condenser Limit
Condenser pressure is continuously
monitored to provide a limit function
that prevents High Pressure Cutout
(HPC) trips. This protection is called
Condenser Refrigerant Pressure
Limit, or High Pressure Limit. A fully
loaded compressor, operating at high
Evaporator Leaving Water
Temperature (ELWT) and high
condenser temperatures causes high
condenser pressures. The purpose of
this limit is to avoid High Pressure
Cutout (HPC) trips by allowing the
Chiller to continue to run at a lower
load instead of tripping off via HPC.
The Condenser Limit will be based
from a pressure conversion from the
Condenser Refrigerant Temperature
sensor, unless there is a Condenser
Refrigerant Pressure sensor installed
(CDRP option). If the Condenser
Refrigerant Pressure Sensor is
installed, then the limit will be based
from the Pressure sensor.
When limited by this action,
"Condenser Pressure Limit" will be
displayed as a sub-operating mode.
The Condenser Limit Setpoint is
factory set (93 percent of HPC),
however can be altered via the
service tool.
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