50 WGZ030D through WGZ200D OMM 1130-2
Manual EXV Control
The EXV position can be set manually. Manual control can only be selected when the circuit is in the
run state. At any other time, the EXV control set point is forced to auto.
Whe
n EXV control is set to auto, the manual EXV position setting follows the auto control position.
When EXV control is set to manual, the EXV position is equal to the manual EXV position setting.
Maximum EXV Operating Pressure
This logic only applies to TGZ units (Refrig = R134a) equipped with electronic expansion valves.
The purpose of this logic is to prevent the operating circuit’s evaporator pressure from exceeding the
‘MaxOpPress’ set point (found on “SET COMP SPs (6) screen) and overloading the compressors.
The electronic expansion valves (EEV) will close to prevent the operating circuit’s evaporator
pressure from exceeding the ‘MaxOpPress’ set point.
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