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CVHE-SVU01E-EN
Control System
Components
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.
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
Figure 22. Delta pressure setting - differential pressure based output
(Defaults shown)
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.
In this example, 2 vdc corresponds to 0 psi differential and 10 vdc
corresponds to 30 psi differential. The min value of 0 psi, and the max value of
30 psi are individually adjustable via the service tool.
Note: Typical settings for CVHE, F, G with refrigerant pumps are as follows.
• Min pressure 0 psid (= 2 vdc)
• Max pressure 6 psid (= 10 vdc)
• Target tower control at 4 psid