Multiplex MB-8-1 - Refrigeration System Diagnostics

Part Number STH034 3/12 121
Refrigeration System Diagnostics
ANALYZING DISCHARGE PRESSURE OR
TEMPERATURE
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/Temperature Chart for ice machine
being checked.
Use the operating conditions determined in step 1 to
find the published normal discharge pressure/
temperature and compare to actual measurements.
3. Measure the actual discharge pressure/
temperature.
4. Compare the measurements (step 3) with the
published pressure/temperature (step 2).
Measurements will fall within the published range on
normally operating ice machine’s.
Discharge Pressure/Temperature High Checklist
Problem Cause
Improper
installation
Refer to Installation procedures.
Restricted
condenser
air flow
Dirty air filter
High inlet air temperature
Condenser discharge air recirculation
Dirty condenser fins
Defective fan motor
Defective fan cycle control
Improper
refrigerant
charge
Overcharged
Non-condensable in system
Wrong type of refrigerant
Other Non-OEM components in system
High side refrigerant line/component
restricted (before mid-condenser)