Subaru B9 TRIBECA WX 2007, Manual

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AC-44
Pressure Switch (Triple Pressure Switch)
HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
20.Pressure Switch (Triple Pressure Switch)
A: INSPECTION
1) Connect the manifold gauge to the service valve on the high-pressure side.
2) Operate the air conditioner, and check the switch operating pressure on ON/OFF in the compressor (mag-
net clutch). Each switch operates as follows.
NOTE:
• High pressure switch turns the compressor (magnet clutch) to OFF when the refrigerant pressure be-
comes extremely high, in order to prevent the evaporator, air conditioner piping and expansion valve from
getting damaged or frozen.
• Middle pressure switch effectively controls the radiator fan output by judging high load/low load in normal
pressure range.
• Low pressure switch turns the compressor (magnet clutch) to OFF, judging as low refrigerant level when
the refrigerant pressure becomes extremely low, in order to prevent the possible seizure when the compres-
sor rotates.
(1) High pressure switch (6) 1,770
±
80 kPa
(18 ± 1 kg/cm
2
, 256 ± 14 psi)
(10) ON
(2) Middle pressure switch (11) OFF
(3) Low pressure switch (7) 1,370
±
120 kPa
(14
±
1 kg/cm
2
, 199
±
14 psi)
(12) Range that compressor operates
(4) 2,550 ± 200 kPa
(26.00
±
2.04 kg/cm
2
,
369.8
±
29.0 psi)
(13) Range that compressor does not
operate (8) 225
+25
–29
kPa
(2.29
+0.25
–0.30
kg/cm
2
,
32.6
+3.6
–4.2
psi)
(14) Pressure is low
(5) 3,140
+50
–200
kPa
(32.02
+0.51
–2.04
kg/cm
2
,
455.4
+7.25
–29.0
psi)
(15) Pressure is high
(9) 196
±
20 kPa
(2.00 ± 0.20 kg/cm
2
, 28.4 ± 2.9 psi)
AC-01433
(1)
(9)
(2)
(3)
(8)
(4)
(5)
(6) (7)
(11)
(10)
(10)
(11)
(11)
(10)
(12)
(13)
(13)
(14)
(15)
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