Manual and Auto

REFRIGERANT FLOW
The refrigerant flows in the standard pattern. It flows from compressor through condenser, liquid tank, evaporator and back to compressor.
The refrigerant evaporation through the evaporator coil is controlled by an externally equalized expansion valve, located inside the evaporator case.

FREEZE PROTECTION
Under normal operating conditions, when the AUTO is switched on, the compressor runs continuously, and the evaporator pressure, and therefore temperature, is controlled by the V-6 variable displacement compressor to prevent freeze up.

REFRIGERANT SYSTEM PROTECTION
Triple-Pressure Switch
The triple pressure switch is located on the liquid tank. If the system pressure rises or falls out of specifications, the switch opens to interrupt compressor clutch operation. Triple-pressure switch closes to turn on the cooling fan to reduce system pressure.

Pressure Relief Valve
The refrigerant system is also protected by a pressure relief valve. The valve is located on the bottom of the compressor. When refrigerant pressure in the system increases abnormally over 3,727 kPa (38 kg/cm, 540 psi), the relief valve's release port opens. The valve then releases refrigerant into the atmosphere.