Grand Voyager L4-2.4L DOHC (1996)
High Pressure Safety Valve HVAC: Description and Operation
DESCRIPTION
The High Pressure Relief Valve prevents damage to the air conditioning system if excessive pressure develops. Excessive pressure can be caused
by condenser air flow blockage, refrigerant overcharge, or air and moisture in the system.
OPERATION
The high pressure relief valve vents only a small amount of refrigerant necessary to reduce system pressure and then reseats itself. The majority of
the refrigerant is conserved in the system. The valve is calibrated to vent at a pressure of 3450 - 4140 kPa (500 - 600 psi). If a valve has vented a
small amount of refrigerant, it does not necessarily mean the valve is defective.
NOTE: Special effort must be used to keep all R-134a system components moisture-tree. Moisture in the oil is very difficult to remove and will cause
a reliability problem with the compressor.
