Liebert 3000 manual Regulating Valve, Johnson Controls valve adjustment

Component Operation and Maintenance

6.4.7Water/Glycol Cooled Condensers Coaxial Condenser

Each water or glycol cooled module has a coaxial condenser which consists of a steel outside tube and a copper inside tube.

Coaxial condensers do not normally require maintenance or replacement if the water supply is clean. If your system operates at high head pressure with reduced capacity, and all other causes have been eliminated, the coaxial condenser may be obstructed and needs to be replaced.

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.

Standard Valve - 150 psig (1034 kPa) system for 3 & 5 ton units (Johnson Controls Valve) High Pressure Valve - 350 psig (2413 kPa) system for 5 ton units (Johnson Controls Valve)

Adjustment—The valve may be adjusted with a standard refrigeration service valve wrench or screw driver. Refer to Table 19 for recommended refrigerant pressures.

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 10 Johnson Controls valve adjustment

Range

Spring

Valve
Spring
Guide	Range Adjustment Screw
	Top
	Retainer
	Insert screwdrivers under
	the valve spring guide.

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 parti- cles from the seat. If this fails, it will be necessary to disassemble the valve and clean the seat.

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