Viking VCSB48, Service Notebook, Page: 18 / 33

18
Electronic Function Description
Freezer Compartment Theory of Operation
As a freezer thermistor warms, the resistance
decreases allowing low voltage signal to be sent to
electronic control. Electronic control sends two low
voltage signals, one to the compressor relay coil )C1)
and one to the evaporator relay coil (E1).
When both relay coils are energized and
both relay contacts are closed, high voltage
circuits to evaporator fan motor and
compressor / condenser fan motors are
complete.
As thermister cools during refrigeration
cycle, resistance through thermistor
increases blocking low voltage signal to
electronic control interrupting circuit.