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Part Number 020007115 06/27/2019
Troubleshooting
Section 5
Refrigeration System Diagnostics
REFRIGERATION SYSTEM CHECKLISTS
Installation/Visual Inspection Checklist
Inadequate Clearances
• Check all clearances, on sides and back.
Sides
0" (0 cm)
Back
3” (76mm)
Front
30" (76 cm)
Condenser is dirty
• Clean the condenser
DISCHARGE PRESSURE HIGH CHECKLIST
Air Condenser
• Dirty condenser fins
• High inlet air temperature
• Condenser discharge air recirculation
• Defective fan motor
Other
• Overcharged
• Non-condensable (air) in system
• Wrong type of refrigerant
• Non-OEM components in system
• High side refrigerant lines/component restricted
DISCHARGE PRESSURE LOW CHECKLIST
• Undercharged
• Wrong type of refrigerant
• Non-OEM components in system
SUCTION PRESSURE HIGH CHECKLIST
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Discharge Pressure
• Discharge pressure is too high and is affecting suction
pressure
Improper Refrigerant Charge
• Overcharged (also see “Freeze Cycle Discharge Pressure
High Checklist” )
• Wrong type of refrigerant
• Non condensible in system
Components
• Defective compressor
Other
• Non-OEM components in system
SUCTION PRESSURE LOW CHECKLIST
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Discharge Pressure
• Discharge pressure is too low and is affecting low side –
refer to “Freeze Cycle Discharge Pressure Low Checklist”
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-OEM components in system
• Restricted/plugged liquid line drier
• Restricted/plugged tubing in suction side or liquid line
of refrigeration system
Summary of Contents for Multiplex N2Fusion
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