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electrical systems, control systems, and complete systems

sensor sends signal to the thermostat.
When the door is open, the magnet on the door is outside of the activation range, so the sensor is deactivated and the light turns on..
the thermostat sends signal to the control board.
When the compressor starts, the control board sends control to the fan relay by default.
Once the temperature rises above the thermostat setting, relay receives signal from the control board to start the compressor..
the lever switch sends signal to the coil of the valve.
The thermostat sends signal to the control board to stop the heater and start the motor.
the door switch sends signal to the control board.
The contactor receives control signals from the thermostat and turns the ON or OFF..
it sends signal to the relay to turn off the compressor..
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