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HVAC System (Heater, Ventilator and A/C)
4. Refrigerant Charging
Procedure
S701292
A: OPERATION
CAUTION:
¼ During operation, be sure to wear safety
goggles and protective gloves.
¼ Before charging the refrigerant, evacuate the
system to remove small amounts of moisture
remaining in the system.
The moisture in the system can be completely
evacuated only under the minimum vacuum
level. The minimum vacuum level affects the
temperature in the system.
¼ The list below shows the vacuum values
necessary to boil water in various temperature.
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)
1) Close the valves on low-/high-pressure sides of
the manifold gauge.
2) Install the low-/high-pressure hoses to the cor-
responding service ports on the vehicle respec-
tively.
3) Connect the center hose of the manifold gauge
set with the vacuum pump.
REFRIGERANT CHARGING PROCEDURE
S701292A16
Vacuum
G4M0596
4) Carefully open the valves on the low-/high-
pressure sides to activate the vacuum pump.
5) After the low-pressure gauge reaches 100.0
kPa (750 mmHg, 29.5 inHg) or higher, evacuate
the system for approx. 15 minutes.
6) After 15 minutes of evacuation, if the reading
shows 100.0 kPa (750 mmHg, 29.5 inHg) or
higher, close the valves on the both sides to stop
the vacuum pump.
7) Note the low-pressure gauge reading.
AC-20
G4M0597
G4M0598
G4M0599
G4M0600
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