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Section 7 Refrigeration System
Part No. 80-1214-3 7-9
EQUALIZATION VALVE (QF2300)
General
The equalization valve is an electrically operated valve
that closes when energized, and opens when de-
energized.
Normal Operation
The valve is energized (closed) during the freeze cycle
and de-energized (open) during the off cycle. The valve
equalizes low and high side pressure during the off
cycle.
Analysis
The valve can fail in two positions:
• Valve will not open in the off cycle.
• Valve remains open during the freeze cycle.
VALVE WILL NOT OPEN IN THE OFF CYCLE
Discharge and suction pressure will not equalize.
VALVE REMAINS OPEN IN THE FREEZE CYCLE:
Symptoms of a equalization valve remaining partially
open during the freeze cycle can be similar to symptoms
of an expansion valve or compressor problem.
Symptoms are dependent on the amount of leakage in
the freeze cycle.
A small amount of leakage will result in poor quality ice.
As the size of the leak increases ice quantity will
decrease until ice production stops completely.
A small amount of leakage will cause an audible
indication as the vapor passes through the valve. As the
size of the leak increases the audible indication
becomes more apparent.
Refer to the Parts Manual for proper valve application.
When replacement is necessary, use only “original”
Manitowoc replacement parts.
WATER REGULATING VALVE
(WATER-COOLED MODELS ONLY)
General
The water regulating valve maintains the freeze cycle
discharge pressure.
Check Procedure
1. Determine if the head pressure is high or low (refer
to “Operational Pressure Charts”).
2. Verify the condenser water meets specifications
(refer to Section 2 for specifications).
3. Adjust valve to increase or decrease discharge
pressure.
4. If the valve will not maintain the correct discharge
pressure clean or replace as needed.
Revised 8/2003