Water Regulating Valve; Service Stem Valves - Cornelius XAC 1444 Service Training Manual

Xtreme Ice Training Manual

WATER REGULATING VALVE

The water regulating valve is used on water-cooled cubers only. The valve is installed in the condenser
outlet water line. It's function is to control the proper operating head pressure by regulating the amount of
water flowing through the condenser. The valve is adjustable and factory set to maintain condenser dis-
charge water temperature @ 108/112_F (42-44_C). Setting the water regulating valve to maintain dis-
charge water temperature eliminates the need to enter the sealed refrigeration system. When checking
the valve, the water temperature should be taken as close to the condenser discharged as possible. The
water temperature will equate to operating head pressure of approximately 260 – 271 PSI (21.1 BAR).
Should adjustment be required, the valve has an adjustment stem on the top of the valve. After allowing
the cuber to operate for 10 minutes in the icemaking mode to balance the system, turning the adjusting
stem CW will increase the discharge water temperature, and CCW
ter temperature.
The water regulating valve must close off condenser water flow completely during the "hot gas" harvest
cycle. There should be no discharge water flowing out of the condenser during the harvest cycle. Should
the valve fail to close during the harvest mode, the condenser will continue to condense the compressor
discharge vapor needed for the harvest cycle and this will result in long harvest times.
Also discharge water temperature below 108_F /112_F will result in long harvest times.
Leaking (bypassing) water regulating valves are normally the result of scale build-up on the valve dia-
phragm and the valve should be flushed, not replaced. To flush the valve, open the adjusting stem wide
open CCW (or force the valve spring up with a screwdriver), open and close the water supply to the con-
denser resulting in the flushing action. Should this not correct the problem, replace the valve diaphragm.
This can be done without entering the sealed refrigeration system.
Damage to the water regulating valve may also be caused by water hammer. Water hammer will result
from the condenser inlet and outlet water lines being reversed or defective valve stops in the water supply
line. Proper installation of water cooled equipment should always include an anti-water hammer standpipe
in the supply inlet line as close to the cuber as possible.
FIGURE 13

SERVICE STEM VALVES

When closing the service stem valves to remove your gauge and manifold set always close the high side
stem valve first. Following this procedure will allow the system to "PULL" the refrigerant vapor from your
manifold set reducing refrigerant loss. When the pressure has been reduced, close the low side stem
valve.
October 17, 2005
will decrease the discharge wa-
31 TP00952