Liebert 3000 Manual Flushing, 4.3.3Testing Valve Function, Metrex Valve adjustment

Water Cooled Models

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.

Figure 14 Metrex Valve adjustment

Adjusting collar nut

Table 12 Refrigerant control settings psi (kPa)

Low Pressure	Low Pressure	High Pressure
Cut Out	Cut In	Cut Out
20 (137.9)	65 (448.2)	360 (2482)

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.

4.3.3Testing 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.

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