Manitowoc Q130 series, Technician'S Handbook

Page: 115 / 236

Part Number 8001119 10/19 115
ANALYZING DISCHARGE PRESSURE
Q130/Q170/Q210/Q270 Ice Machines Only
1. Determine the ice machine operating conditions:
Air temp. entering condenser ______
Air temp. around ice machine ______
Water temp. entering sump trough ______
2. Refer to “Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts” on page 203 for ice
machine being checked.
Use the operating conditions determined in step 1 to
find the published normal discharge pressures.
Freeze Cycle ______
Harvest Cycle ______
3. Perform an actual discharge pressure check.
4. Compare the actual discharge pressure (step 3)
with the published discharge pressure (step 2).
The discharge pressure is normal when the actual
pressure falls within the published pressure range for
the ice machine’s operating conditions. It is normal for
the discharge pressure to be higher at the beginning of
the freeze cycle (when load is greatest), then drop
through out the freeze cycle.
Freeze
Cycle PSIG
Harvest
Cycle PSIG
Beginning of
Cycle __________ __________
Middle of
Cycle __________ __________
End of
Cycle __________ __________