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SUCTION PRESSURE HIGH CHECKLIST
Problem
• Cause
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Discharge Pressure
• Discharge pressure is too high, and is affecting
suction pressure, refer to “Freeze Cycle Discharge
Pressure High Checklist”
Improper Refrigerant Charge
• Overcharged
• Wrong type of refrigerant
• Non Condensable in system
Other
• Non-Manitowoc components in system
• Hot gas valve leaking
• Defective compressor
• Water inlet valve leaking
SUCTION PRESSURE LOW CHECKLIST
Problem
• Cause
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Discharge Pressure
• Discharge pressure is too low, and is affecting
suction pressure, refer to “Freeze Cycle Discharge
Pressure Low Checklist”
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant
Other
• Non-Manitowoc components in system
• Improper water supply over evaporator refer to
“Water System Checklist”
• Loss of heat transfer from tubing on back side of
evaporator
• Restricted/plugged liquid line drier
• Restricted/plugged tubing in suction side of
refrigeration system
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
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