Problem (Freeze Cycle); Valve Not Maintaining Discharge Pressure; Water Regulating Valve - Manitowoc S300 Technician's Handbook

WATER REGULATING VALVE

Self-Contained Water-Cooled Models Only
FUNCTION
The water regulating valve maintains the freeze cycle
discharge pressure. The valve setting for the
S3300W-HP is 240 psig.
CHECK PROCEDURE
1. Determine if the head pressure is high or low
(refer to Operational Pressure Chart page 191).
2. Verify the condenser water meets specifications.
3. Adjust valve to increase or decrease discharge
pressure (if discharge pressure remains high
(refer to Headmaster Control Valve Diagnostics
page 164 before replacing valve).
4. Determine the temperature of the liquid line
entering the receiver by feeling it. This line is
normally warm; body temperature.
5. Using the information gathered, refer to the list for
diagnosis.

Problem (Freeze Cycle)

Valve not maintaining discharge pressure.

• Valve incorrectly set, dirty or defective. Adjust
valve to 240 psig, clean or replace valve.
Discharge pressure extremely high; Liquid line
entering receiver feels hot.
• Water regulating valve incorrectly set or not
opening. Verify Head Pressure Control Valve
operation before changing water regulating valve.
Discharge pressure low, Liquid line entering
receiver feels warm to hot.
• Ice machine low on charge. Verify Total System
Refrigerant Charge page 187.
160 Part Number 80-1479-3 7/10