Evacuation; Charging - Mazda MX-5 1990 Workshop Manual

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AIR CONDITIONER
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05UOUX-047
05UOUX-095
05UOUX-097
96U16X-098
Evacuation .
Whenever the refrigeration system has been exposed to the
atmosphere, it must be purged of moisture and air.
1. Connect the manifold gauge set. (Refer to page U-28.)
2. Connect the center hose of the gauge set to the vacuum
pump inlet.
3. Start the vacuum pump and open both manual valves.
4. When the low-pressure gauge shows approximately 700
mmHg (27.6 inHg), close both manual valves and stop the
vacuum pump.
5. Verify that the pressure remains the same for 5 minutes
or more. If the pressure changes, check the system for leaks,
and repair as necessary.
6. If no leak is found, start the vacuum pump once again and
open both manual valves to obtain 760 mmHg (29.9 inHg).
7. After the low-pressure gauge shows lower than
760 mmHg
(29.9 inHg), continue evacuating for 20 minutes.
8. Close both manual valves and stop the vacuum pump.
9. Disconnect the hose from the vacuum pump.
05UOUX-096
Charging
1 . Close the high- and low-pressure manual valves fully after
the system is evacuated.
2. Install the refrigerant container service valve.
3. Open the low-pressure manual valve to charge the system
with refrigerant gas.
Note
• When charging of the system becomes slow, run
the engine at fast idle and operate the air condi-
tioner.
Caution
• Be sure to keep the container in the upright posi-
tion to prevent liquid refrigerant from being charged
into the system through the suction side, possibly
damaging the compressor.
• Never open the high-pressure manual valve while
charging the system with the AIC ON. Doing so may
cause the refrigerant can to explode.
U-29