Index Subaru Subaru Impreza 3 / Impreza WRX / Impreza WRX STI - service repair manual 2008-2014 year
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AC-43 Pressure Switch (Triple Pressure Switch) HVAC SYSTEM (HEATER, VENTILATOR AND A/C) 21.Pressure Switch (Triple Pressure Switch) A: INSPECTION 1) Connect the manifold gauge to the service valve on the high-pressure side. 2) Disconnect the pressure switch connector. 3) Start the air conditioner, and check the operating pressure of switch by turning the compressor (magnet clutch) to ON/OFF. Operation of each switch is as follows. 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, etc. • Middle pressure switch effectively controls the radiator fan output by judging high load/low load in normal range. • The low pressure switch detects a refrigerant shortage and deactivates the compressor (magnet clutch) if the refrigerant pressure is abnormally low. (Because any further compressor operation in such a state may lead to compressor seizure) (1) High pressure switch (6) 1,770±100 kPa 2 , 256.65±14.5 psi) (11) OFF (2) Middle pressure switch (7) 1,470±120 kPa 2 , 213.15±17.4 psi) (12) Operative range of compressor (3) Low pressure switch (8) 225±30 kPa 2 , 32.6±4.3 psi) (13) Inoperative range of compressor (4) 2,350±200 kPa 2 , 340.7±29.0 psi) (9) 196±25 kPa 2 , 28.4±3.6 psi) (14) Low pressure (5) 2,940±200 kPa 2 , 426.3±29.0 psi) (10) ON (15) High pressure AC-02346 (1) (9) (2) (3) (8) (4) (5) (6) (7) (11) (10) (10) (11) (11) (10) (12) (13) (13) (14) (15) |