Manitowoc EC18, Technician'S Handbook

Page: 65 / 184

Part Number 80-1479-3 10/10 53
Analyzing Discharge Pressure
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 Hour Ice Production/
Refrigeration Pressure Chart for ice machine being
checked.
3. Use the operating conditions determined in Step 1
to find the published normal discharge pressures.
Freeze Cycle ______
Harvest Cycle ______
Perform an actual discharge pressure check.
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
throughout the freeze cycle.
Freeze Cycle
PSIG
Harvest Cycle
PSIG
Beginning
of Cycle
__________ __________
Middle
of Cycle
__________ __________
End
of Cycle
__________ __________