Qf2300 Only; Equalization Valve - Manitowoc QF0400 Technician's Handbook

QF2300 Only

EQUALIZATION VALVE

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.
170 Part Number 80-1230-9 10/10