Trane CenTraVac Duplex CDHF Operation & Maintenance Manual page 59

B) Refrigerant Differential Pressure
Indication Output:
A 2 to 10 VDC analog output is
provided instead of the previous
condenser pressure output signal.
This signal corresponds to a
predetermined minimum and
maximum pressure settings setup at
commissioning of this feature. This
relationship can be altered using the
service tool if required.
Figure 26. Delta pressure setting - differential pressure based output
(Defaults shown)
Note: In this example, 2 vdc corresponds to OPSI differential and 10 vdc
corresponds to 30 psi differential. The minimum value of 0 psi, and
maximum value of 30 psi are individually adjustable via the service tool.
CDHF-SVU01C-EN
Control System
Components
The "Minimum Delta Pressure " is
typically set to 0 psi and will then
correspond to 2 vdc. The "Maximum
Delta Pressure " is typically set to 30
psi and corresponds to 10 vdc.
The Minimum Delta Pressure
Calibration setting has a range of 0-
400 psid (0-2758 kPa) in increments of
1 psid (1kPa). The Maximum Delta
Pressure Calibration setting has a
range of 1-400 psid (7-2758 kPa) in
increments of 1 psid (1kPa). The
condenser refrigerant pressure is
based on the Condenser Refrigerant
Temperature sensor if the Condenser
Pressure Option is selected as "Not
Installed" at the display.
The evaporator refrigerant pressure is
based on the Saturated Evaporator
Refrigerant Temperature Sensor.
See CTV-PRB006-EN for additional
information about condenser water
temperature control.
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