Manitowoc QM20

Part Number 80-01111-9 7/10 153
Suction Pressure High Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Discharge Pressure
• Discharge pressure is too high, and is affecting
suction pressure, refer to “Discharge Pressure
High Checklist” on page 150.
Improper Refrigerant Charge
• Overcharged
• Wrong type of refrigerant
• Non-condensables in system
Other
• Non-Manitowoc components in system
• Hot gas valve leaking
• Defective compressor
• Water inlet valve leaking
Suction Pressure Low Checklist
Improper Installation
• Refer to “Installation and Visual Inspection
Checklist” on page 104.
Discharge Pressure
• Discharge pressure is too low, and is affecting
suction pressure, refer to “Freeze Cycle Discharge
Pressure Low Checklist” on page 150.
Improper Refrigerant Charge
• Undercharged
• Wrong type of refrigerant