Cycle Times/24-Hour Ice Production/Refrigerant Pressure - Manitowoc QuietQube SD0672C Technician's Handbook

Cycle Times/24-Hour Ice Production/
Refrigerant Pressure
These charts are used as guidelines to verify correct
ice machine operation.
Accurate collection of data is essential to obtain the
correct diagnosis.
• Ice production checks that are within 10% of the
chart are considered normal. This is due to
variances in water and air temperature. Actual
temperatures will seldom match the chart exactly.
• Zero out manifold gauge set before obtaining
pressure readings to avoid misdiagnosis.
• All pressure readings are taken at the ice machine
head section. Connect Manifold gauge set at the
suction and liquid line shut-off valves to obtain
pressure readings Pressures taken at the
condensing unit will vary with line set length,
ambient, exposed line set etc. and will not match
the published pressures. Do not use the receiver
service valve to obtain high side pressures.
• Discharge and suction pressure are highest at the
beginning of the cycle. Suction pressure will drop
throughout the cycle. Verify the pressures are
within the range indicated.
• During low ambient conditions, it is normal for the
head pressure control valve to hunt (fluctuate up
and down) on CVD condensing units. Hunting
varies by model and ambient temperature, but
generally settles out within the first 6 minutes of
the freeze cycle.
Part Number 80-1505-3 6/11
Charts
239