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Some automotive products use a solenoid bypass to control the evaporator pressure and temperature. The thermal switch is attached to the suction pressure line at the evaporator outlet manifold. The electrical contacts in the switch are connected in series with the temperature control switch and the solenoid bypass valve winding. In the normal position, the contacts are closed.
A decrease in the temperature of the refrigerant gas leaving the evaporator will cause a thermal blade to bend and open the electrical circuit to the solenoid valve when the temperature reaches approximately 25°F (-4°C). Opening the solenoid valve allows a charge of hot refrigerant gas to flow into the evaporator. When the temperature increases