Before Calling for Service | Section 5 |
Safety Limit #1
Freeze time exceeds 60 minutes for 3 consecutive freeze cycles.
Possible Cause
Improper installation
Water system
Electrical system
Restricted condenser air flow
Refrigeration system
Check/Correct
•See “Installation Instructions” Section two of this manual
•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
•Ice thickness probe out of adjustment
•Harvest cycle not initiated electrically
•Relay not energizing
•Compressor electrically
•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
•
•Improper refrigerant charge
•Defective hot gas valve
•Defective compressor
•TXV starving or flooding (check insulation and bulb mounting)
•
•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
Improper installation
Water system
Electrical system
Refrigeration system
Check/Correct
•See “Installation Instructions” Section two of this manual
•Water area (evaporator) dirty
•Water freezing behind evaporator
•Low water pressure (20 psi min.)
•Loss of water from sump area
•Clogged water distribution tube
•Dirty/defective water float valve
•Defective water pump
•Ice thickness probe out of adjustment
•Ice thickness probe dirty
•Bin switch defective
•Premature harvest
•
•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.