Analyzing Discharge Pressure - Manitowoc CNF201A Technician's Handbook

ANALYZING DISCHARGE PRESSURE

1. Determine the ice machine operating conditions:
• Air temperature entering condenser
• Air temperature around ice machine
• Water temperature entering water reservoir
2. Refer to 24-Hour Ice Production/Refrigeration
Pressure Chart for ice machine being checked.
Use the operating conditions determined in Step 1 to
find the published normal discharge pressures and
compare to actual discharge pressure readings.
3. Measure the actual discharge pressure.
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.
Discharge Pressure High Checklist
Problem
Improper
installation
Restricted
condenser air
flow
Improper
refrigerant
charge
Other
Part Number 000015432 4/18
Refer to "Installation/Visual Inspection Checklist."
Dirty air filter
High inlet air temperature
Condenser discharge air recirculation
Dirty condenser fins
Defective fan motor
Overcharged
Non-condensible in system
Wrong type of refrigerant
Non-Manitowoc components in system
High side refrigerant line/component restricted
(before mid-condenser)
Cause
67