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Countertop Icemaker IMD Series Installation Manual
© 2004-2009, IMI Cornelius Inc. - 11 - Publication Number: 638085277INS
NOTE: On water cooled units adjust condenser modulating valve before troubleshooting expan-
sion valve.
CAUTION: Very high discharge pressure is present in system. Quick disconnects on your gages
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
to maintain the proper operating pressure in the refrigeration system high side. The flow of water through
the valve is increased as the high side pressure rises and decreases 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 6). Turn screw counterclockwise to
raise opening point. Opening point of valve should be set to maintain proper operating pressure in refrig-
eration system high side. Refer to Pressure Chart on Page 11. Closing point of valve should be set low
enough to close valve during compressor stand by periods.
NOTE: Cold water will absorb more heat faster than warm water. The water flow will therefore
automatically increase as inlet temperature increase.
FIGURE 6. ADJUSTMENT SCREW
CONDENSER MODULATING VALVE REMOVAL
1. Disconnect power to unit, then shut off water supply to condenser and reclaim refrigerant from sys-
tem.
2. Remove inlet water line from Condenser modulating Valve. Also remove tube from refrigerant high
side line.
3. Remove Condenser Modulating Valve and bracket.
4. Remove valve from bracket.
5. Replace Condenser Modulating Valve by reversing Steps 2 thru 4.
6. Recharge unit with refrigerant per nameplate.
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.