80 Part Number STH042 3/14
Suction Pressure Low Checklist
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
on page 64.
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” on page 65.
• 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.
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