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Water Cooled Models
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4.3 Water Regulating Valve
The water regulating valve automatically regulates the amount of fluid necessary to remove the heat
from the refrigeration system, permitting more fluid to flow when load conditions are high and less
fluid to flow when load conditions are low. The valve consists of a brass body, balance spring, valve
seat, valve disc holders, capillary tube to discharge pressure, and adjusting screw.
4.3.1 Standard Valve - 150psig (1034kPa) System for 3 & 5 Ton Units (Johnson Controls Valve)
High Pressure Valve - 350psig (2413kPa) System for 5 Ton Units (Johnson Controls Valve)
Adjustment
The valve may be adjusted with a standard refrigeration service valve wrench or screw driver.
To lower the head pressure setting, turn the square adjusting screw clockwise until the high pressure
gauge indicates the desired setting.
To raise the head pressure setting, turn the adjusting screw counterclockwise until the desired set-
ting is obtained.
Figure 13 Johnson Controls valve adjustment
Manual Flushing
The valve may be flushed by inserting a screwdriver or similar tool under the two sides of the main
spring and lifting. This action will open the valve seat and flush any dirt particles from the seat. If
this fails, it will be necessary to disassemble the valve and clean the seat.
Range
spring
Valve spring
guide
Top
retainer
Range adjustment screw
Insert screwdrivers underneath
the valve spring guide