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4.3.2 High 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.
Figure 14 Metrex Valve adjustment
Manual Flushing
The valve may be flushed by rotating the socket head screw clockwise. This screw must be in the OUT
position (counterclockwise) for normal valve operation.
4.3.3 Testing Valve Function
When the refrigeration system has been off for approximately 10-15 minutes, the water flow should
stop.
Should the water continue to flow, the valve is either improperly adjusted or the pressure sensing
capillary is not properly connected to the condenser.
Table 12 Refrigerant control settings psi (kPa)
Low Pressure
Cut Out
Low Pressure
Cut In
High Pressure
Cut Out
20 (137.9) 65 (448.2) 360 (2482)
Adjusting collar nut