74
Safety Limit Checklist
The following checklists are designed to assist the service
technician in analysis. However, because there are many
possible external problems, do not limit your diagnosis to
only the items listed.
Safety Limit #1
Freeze time exceeds 45 minutes for 3 consecutive
freeze cycles.
Possible Cause Checklist
Improper installation
• Refer to “Installation/Visual Inspection Checklist” on
Water System
• Water Level too high or defective float switch (water
escaping water trough)
• Low water pressure (20 psig min.)
• High water pressure (80 psig max.)
• High water temperature (90°F/32.2°C max.)
• Clogged water distribution tube
• Dirty/defective water inlet valve
• Defective water pump
Electrical System
• Harvest cycle not initiated electrically
• Contactor not energizing
• Compressor electrically non-operational
• Restricted condenser air flow
• High inlet air temperature (110°F/43.3°C max.)
• Condenser discharge air re-circulation
• Dirty condenser fins
• Defective fan cycling control
• Defective fan motor
• Low water pressure (20 psig min.)
• High water temperature (90°F/32.2°C max.)
• Dirty condenser
Summary of Contents for STH042 4/16
Page 2: ......
Page 14: ...14 Part Number STH042 4 16 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 42: ...42 Part Number STH042 4 16 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 56: ...56 Part Number STH042 4 16 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 98: ...98 Part Number STH042 4 16 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 126: ...126 Part Number STH042 4 16 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 136: ...136 Part Number STH042 4 16 U140 U190 U240 WIRING DIAGRAM WITHOUT J4 THERMISTOR TERMINAL ...
Page 137: ...Part Number STH042 4 16 137 U310 WIRING DIAGRAM WITHOUT J4 THERMISTOR TERMINAL ...
Page 138: ...138 Part Number STH042 4 16 U140 U190 U240 WIRING DIAGRAM WITH J4 THERMISTOR TERMINAL ...
Page 139: ...Part Number STH042 4 16 139 U310 WIRING DIAGRAM WITH J4 THERMISTOR TERMINAL ...
Page 144: ...144 Part Number STH042 4 16 THIS PAGE INTENTIONALLY LEFT BLANK ...
Page 145: ......