Selector switch and resistors

Thermostat and return-air sensor

Ambient and cabinet temperature

Increase or decrease refrigerant flow

Lubricate the clutch assembly

Lubricate the heat exchangers

Circulate oil back to compressor

Lubricate the moving parts of TEV

Thermostat, LPC, HPC

LPC, Blower Fan Motor

HPC, Condenser Fan Motor

Thermostat, Condenser Fan Motor

Check Rpm of engine shaft

Check Rpm of compressor shaft

Start and stop the evaporator blower

Start and stop the compressor electro magnetically

LPC, HPC and Blower-switch

Thermostat, Electromagnetic clutch, on-off control

Thermostat, Thermostatic expansion valve, Blower-switch

Thermostat, Low-pressure control and high pressure control