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CAUTION: Very high discharge pressure is present in system. Quick disconnects on your
gauges will minimize danger and loss of refrigerant. Comply with federal regulations for
reclaiming refrigerant.
CONDENSER MODULATING VALVE
The reason for using a water modulating valve is to supply the correct amount of water to the condenser. and to
maintain a proper operating pressure to refrigeration system high side.
The flow of water through the valve is increased as the high side pressure rises and is decreased as high side
pressure lowers.
To calibrate the amount of water flow with the refrigeration system high side pressure, turn adjustment screw
located on end of valve opposite of bellows. See Figure 14. Turn screw counterclockwise to raise opening point
or clockwise to lower opening point. Opening point of valve should be set to maintain proper operating pressure
in refrigeration system high side. Refer to Pressure Chart on page 16. Closing point of valve should be set low
enough to close valve during compressor stand-by periods.
NOTE: Cold water will absorb heat faster than warm water. The water flow will therefore automatically
increase as inlet temperature increases.
FIGURE 13. EXPANSION VALVE
CONDENSER MODULATING VALVE REMOVAL
1. Disconnect power to unit, then shut off water supply to condenser and evacuate refrigerant from system.
2. Remove inlet water line from Condenser Modulating Valve. Also remove tube from high side refrigerant
line.
3. Remove Condenser Modulating Valve and bracket from unit.
4. Remove valve from bracket.
5. Replace Condenser Modulating Valve by reversing Steps 2 thru 4. Then pull system into vacuum.
6. Charge unit with proper amount of refrigeration.
7. Turn power and water on to unit.
8. With unit running, adjust modulating valve to proper setting.
9. Go through a complete system check.
SIGHT
GLASS
THERMOSTATIC
EXPANSION VALVE
17
FIGURE 14. ADJUSTMENT SCREW
638085278
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Troubleshooting
