Maxima GLE V6-3.5L (VQ35) (2002)
High Pressure Safety Valve HVAC: Description and Operation
Refrigerant System Protection
Refrigerant Pressure Sensor
The refrigerant system is protected against excessively high or low pressures by the refrigerant pressure sensor, located on the condenser. If the system
pressure rises above, or falls below the specifications, the refrigerant pressure sensor detects the pressure inside the refrigerant line and sends the voltage
signal to the ECM. ECM makes the A/C relay go OFF and stops the compressor when pressure on the high pressure side detected by refrigerant pressure
sensor is over about 2,746 kPa (28 kg/sq.cm, 398 psi), psi or below about 177 kPa (1.8 kg/sq.cm, 26 psi).
Pressure Relief Valve
The refrigerant system is also protected by a pressure relief valve, located in the rear head of the compressor. When the pressure of refrigerant in the
system increases to an abnormal level [more than 3,727 kPa (38 kg/sq.cm, 540 psi)], the release port on the pressure relief valve automatically opens
and releases refrigerant into the atmosphere.