Subaru IMPREZA GD 2007 Series Manual page 3934

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19.Pressure Switch (Dual Switch)
A: INSPECTION
1) Connect the manifold gauge to the service valve on the high-pressure side.
2) Start the air conditioner, and check the operating pressure of switch by turning the compressor (magnet
clutch) to ON/OFF.
NOTE:
• High pressure switch turns the compressor (magnet clutch) to OFF when the refrigerant pressure be-
comes extremely high to prevent the evaporator, air conditioner piping and expansion valve from getting
damaged or frozen.
• Low pressure switch turns the compressor (magnet clutch) to OFF, judging as low refrigerant level when
the refrigerant pressure becomes extremely low, to prevent the possible seizure if the compressor rotates.
High and low pressure switch
Pressure Switch (Dual Switch)
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
Operation
Increasing to 2,800±100 (29±1, 406±15)
Turns OFF.
Decreasing to 278±29 (2.83±0.3, 40.3±4.2)
Increasing to 287
Turns ON.
Decreasing to 2,200±200 (22.4±2, 319±29)
AC-37
Standard
2
kPa (kgf/cm , psi)
+39 +0.4 +5.7
(2.9 , 42 )
–25 –0.25 –3.6