Trane CenTraVac Duplex CDHE, Operation & Maintenance Manual

Page: 58 / 116

CDHF-SVU01C-EN
58
Control System
Components
CDRP Refrigerant Pressure
Output Option 1A15:
Refrigerant Pressure Output can be
configured at commissioning to
correspond to either A) the absolute
condenser pressure, or B) the
differential pressure of the evaporator
to condenser pressures.
This vdc output is located at 1A15 –
J2 – 4 (+) to J2-6 (Ground)
The Voltage DC Output can source a
maximum of 22 mA of current.
This output is Voltage DC only, 4-20
mA is not supported.
A) Condenser Pressure Output.
2 to 10 Vdc corresponds to 0 Psia to
the HPC (in Psia) setting.
Note: CH530 control allows for Delta
Pressure, or, condenser pressure but
not both on one circuit.
Temperature based
On standard machines the Percent
Condenser Pressure Indication
Output is based on the Saturated
Condenser Refrigerant and a
temperature to pressure conversion
is made.
If the Condenser Saturated
Temperature goes out of range due to
an open or short, a pressure sensor
diagnostic will be called and the
output will also go to the respective
out of range value. That is, for an out
of range low on the sensor, the
output will be limited to 2.0 VDC. For
an out of range high on the sensor,
the output will be limited to 10.0
VDC.
Pressure based
With the Enhanced Protection EPRO
option, a condenser pressure
transducer is installed and the
pressure is measured.
If the Condenser Pressure sensor
goes out of range due to either an
open or short, a pressure sensor
diagnostic will be called and the
output will go to end of range low.
That is, for an out of range low on the
sensor, the output will be limited to
2.0 VDC. For an out of range high on
the sensor, the output will be limited
to 2.0 VDC.
Figure 25. Condenser pressure based output