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Refrigeration System
Freeze Cycle Suction Pressure High Checklist
Possible Cause Check/Correct
Improper installation • See “Installation/Visual Inspection Checklist”
Discharge pressure • Discharge pressure is too high, and is affecting low side (See “Freeze
Cycle Discharge Pressure High Checklist”)
Improper refrigerant charge • Overcharged
• Wrong type of refrigerant
Other • Non-Manitowoc components in system
• Hot gas valve stuck open
• TXV flooding (check bulb mounting)
• Defective compressor
Freeze Cycle Suction Pressure Low Checklist
Possible Cause Check/Correct
Improper installation • See “Installation/Visual Inspection Checklist”
Discharge pressure • Discharge pressure is too low, and is affecting low side (See “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 (See “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
• TXV starving
NOTE: Do not limit your diagnosis to only the items listed in the checklists.