B) Refrigerant Differential Pressure Indication Output:
A 2 to 10 Vdc analog output is provided instead of the previous condenser pressure
output signal. This 2 signal corresponds to a predetermined minimum and maximum
pressure settings setup at commissioning of this feature. This relationship can be al-
tered using Tracer TU ™ 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 increments of 1 psid (1kPa). The condenser refriger-
ant pressure is based on the Condenser Refrigerant Temperature sensor. The evapora-
tor refrigerant pressure is based on the Saturated Evaporator Refrigerant Temperature
Sensor.
Figure 35. Delta pressure setting
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