Section 7 Refrigeration System
Part Number 80-1630-3 7-13
Freeze Cycle Suction Pressure High Checklist
Freeze Cycle Suction Pressure Low Checklist
NOTE: Do not limit your diagnosis to only the items listed in the checklists.
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
H.P.R. solenoid leaking
Harvest valve stuck open
TXV flooding (check bulb mounting)
Defective compressor
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
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