Viking VUAR140 Troubleshooting Guide download pdf (Page 83)

Wiring: Schematic ---VCBB Bottom Freezer -Refrigerator---

Adaptive Defrost Theory of Operation: After designated compressor run time, refrigeration cycle is interrupted

and electronic control sends a low voltage signal to defrost relay coil (def D1). Powering the relay coil closes

contact (D1) completing high voltage circuit to defrost heater through closed defrost terminator (closes at 15°F).

Isolator, which is part of high voltage PC board, recognizes presence of line voltage to defrost heater and sends low

voltage signal to electronic control. Electronic control keeps count of number of minutes, defrost terminator

remains closed (opens at 48°F). length of time defrost terminator is closed determines if the next defrost cycle

advances by 4 hours of compressor run time, stays at the same interval, or delays by 4 hours of compressor run. If

defrost terminator does not open before 29 minutes, defrost cycle is automatically terminated by electronic control

and refrigeration cycle will resume after 6 minutes dwell time.

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Viking VUAR140 Troubleshooting Guide Page 83