Manitowoc Marine Q 1000, Service Technician'S Handbook

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SUCTION PRESSURE LOW CHECKLIST
Problem
•
Cause
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-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
•
TXV starving
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.