Manitowoc RNS012, Technician'S Handbook, Page: 77 / 124

Part Number STH044 10/13 69
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 Cause
Improper
installation Refer to “Installation/Visual Inspection
Checklist.”
Restricted
condenser
air flow
Dirty air filter
High inlet air temperature
Condenser discharge air recirculation
Dirty condenser fins
Defective fan motor
Improper
refrigerant
charge
Overcharged
Non-condensible in system
Wrong type of refrigerant
Other Non-Manitowoc components in system
High side refrigerant line/component
restricted (before mid-condenser)