Subaru IMPREZA GD 2007 Series Manual page 3917

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HVAC SYSTEM (HEATER, VENTILATOR AND A/C)
4. Refrigerant Charging
Procedure
A: PROCEDURE
CAUTION:
• During work, be sure to wear protective gog-
gles and protective gloves.
• Air in the cycle can cause inadequate cool-
ing, and moisture can cause clogging (freezing)
and rust in the cycle.
To remove this air and moisture, perform a vac-
uum pull with a vacuum pump before filling
with refrigerant. By making the condition inside
of the system a vacuum, moisture will boil and
evaporate so it can be removed.
• The list below shows the vacuum values nec-
essary to boil water at various temperatures. In
addition, the vacuum levels indicated on the
gauge are approx. 3.3 kPa (25 mmHg, 0.98 inHg)
lower than those measured at 304.8 m (1,000 ft)
above sea level.
Vacuum level required to boil water (at sea level)
Temperature
1.7°C (35°F) 100.9 kPa (757 mmHg, 29.8 inHg)
7.2°C (45°F) 100.5 kPa (754 mmHg, 29.7 inHg)
12.8°C (55°F) 99.8 kPa (749 mmHg, 29.5 inHg)
18.3°C (65°F) 99.2 kPa (744 mmHg, 29.3 inHg)
23.9°C (75°F) 98.5 kPa (739 mmHg, 29.1 inHg)
29.4°C (85°F) 97.2 kPa (729 mmHg, 28.7 inHg)
35°C (95°F) 95.8 kPa (719 mmHg, 28.3 inHg)
Refrigerant Charging Procedure
1) Close all valves of the manifold gauge.
Vacuum
AC-20
L H
(1)
(4)
(2)
(6)
(5)
(3)
(1)
(2)
L: Low pressure gauge
H: High-pressure gauge
(1) Low pressure valve
(2) Vacuum pump valve
(3) High pressure valve
(4) For low pressure
(5) For vacuum pump
(6) For high pressure
(3)
AC-00146