6-10
Section 6Service
Safety Limit #1
Freeze time exceeds 60 minutes for 3 consecutive freeze cycles.
Possible Cause Check/Correct
Improper installation • See section 2 “Installation Instructions”
Water system • Low water pressure (20 psi min.)
• High water pressure (80 psi max.)
• High water temperature (90°F/32.2°C max.)
• Clogged water distribution tube
• Dirty/defective water fill valve
• Dirty/defective water dump valve
• Defective water pump
Electrical system • Ice thickness probe out of adjustment
• Harvest cycle not initiated electrically
• Harvest heater contactor not energizing
• Compressor electrically non-operational
Restricted condenser
air flow
• High inlet air temperature (110°F/43.3°C max.)
• Dirty condenser fins
• Defective fan motor
Refrigeration system • Non-Manitowoc components
• Improper refrigerant charge
• Defective head pressure control
• Defective compressor
• TXV starving or flooding (check bulb mounting)
• Non-condensibles in refrigeration system
• Plugged or restricted high side refrigerant lines or component
Safety Limit #2
Harvest time exceeds 6.5 minutes for 3 consecutive harvest cycles.
Possible Cause Check/Correct
Improper installation • See section 2 “Installation Instructions”
Water system • Water area (evaporator) dirty
• Dirty/defective water dump valve
• Water freezing behind evaporator
• Plastic extrusions and gaskets not securely mounted to the evaporator
• Low water pressure (20 psi min.)
• Loss of water from sump area
• Clogged water distribution tube
• Dirty/defective water fill valve
• Defective water pump
Electrical system • Ice thickness probe out of adjustment
• Ice thickness probe dirty
• Bin switch defective
• Premature harvest
• Defective harvest heater element
Refrigeration system • Non-Manitowoc components
• Improper refrigerant charge
• Defective head pressure control valve
• TXV flooding (check bulb mounting)
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