Emerson 3000 4.3Water Regulating Valve, Adjustment, Johnson Controls valve adjustment

Water-Cooled Models—Self-Contained Compressor

4.3Water 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.

4.3.1Standard 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 21 Johnson Controls valve adjustment

Range spring

Valve spring guide

Range adjustment screw

Top retainer

Insert screwdrivers underneath the valve spring guide

4.3.2High Pressure Valve - 350 psig (2413 kPa) System for 3-Ton Units (Metrex Valve) Adjustment

The valve may be adjusted using a 1/8" diameter rod. Turn the adjusting collar nut counterclockwise to raise head pressure; turn it clockwise to lower head pressure. Rotation directions are viewed from top of valve spring housing.

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