5-4
Before Calling for Service
Section 5
Safety Limit #1
Freeze time exceeds 60 minutes for 3 consecutive freeze cycles.
Possible Cause
Check/Correct
Improper installation
•
See “Installation Instructions” Section 2 of this manual
Water system
•
Low water pressure (20 psi minimum.)
•
High water pressure (80 psi maximum.)
•
High water temperature (90
°
F/32.2
°
C maximum.)
•
Clogged water distribution tube
•
Dirty/defective water float valve
•
Loss of water from sump area
•
Defective water pump
Electrical system
•
Ice thickness probe out of adjustment
•
Harvest cycle not initiated electrically
•
Compressor relay not energizing
•
Compressor electrically non-operational
Restricted condenser air flow
(air-cooled models)
•
High inlet air temperature (110
°
F/43.3
°
C maximum.)
•
Condenser discharge air recirculation
•
Dirty condenser filter
•
Dirty condenser fins
•
Defective fan cycling control
•
Defective fan motor
Refrigeration system
•
Non-Manitowoc components
•
Improper refrigerant charge
•
Defective hot gas valve
•
Defective compressor
•
TXV starving or flooding (check insulation and bulb mounting)
•
Non-condensables in refrigeration system
•
Plugged or restricted high side refrigerant lines or component
Safety Limit #2
Harvest time exceeds 3.5 minutes for 3 consecutive harvest cycles.
Possible Cause
Check/Correct
Improper installation
•
See “Installation Instructions” Section 2 of this manual
Water system
•
Water area (evaporator) dirty
•
Water freezing behind evaporator
•
Low water pressure (20 psi minimum.)
•
Loss of water from sump area
•
Clogged water distribution tube
•
Dirty/defective water float valve
•
Defective water pump
Electrical system
•
Ice thickness probe out of adjustment
•
Ice thickness probe dirty
•
Bin switch defective
•
Premature harvest
Refrigeration system
•
Non-Manitowoc components
•
Improper refrigerant charge
•
Defective hot gas valve
•
TXV flooding (check insulation and bulb mounting)
•
Defective fan cycling control
Because there are many possible external problems,
do not limit your diagnosis to only the items listed in these charts.
Summary of Contents for Q210 series
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Page 22: ...3 6 Ice Machine Operation Section 3 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 33: ...4 11 Section 4 Maintenance THIS PAGE INTENTIONALLY LEFT BLANK ...
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