Manitowoc QY0874C

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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
 Cool vapor valve leaking
 TXV flooding (check bulb mounting)
 Defective compressor
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.