1) Copy following links for defrost timer resources, explanation, manual, general description and illustrations:
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrosthttp://waterheatertimer.org/images/8145-20-wiring-600.jpg2) Generally:
Power wires connect to terminals 1 and N.
Heater turns ON during defrost cycle, so heater connects to NO terminal 3, and to terminal N
Refrigeration fan motor is OFF during defrost cycle, and ON during refrigeration cycle, so it connects to terminal 4, and to terminal N.
Limit switch, which is the pressure or temperature sensor, connects to to terminal X and to terminal N. When defrost cycle pressure or temperature reaches set point, the limit switch activates, and this causes 8145 timer to reset, and then defrost cycle ends.
If you need further help, I’m available over the phone at
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