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OPERATION GUIDE FOR PULLING VACUUM TO AC SYSTEM
1. Pump preparation: Insert the pump's plug, and fill it with oil, making sure
not to exceed the maximum level.
2. Locate the high and low-pressure service ports of the AC system. These
ports are usually situated near the compressor on the lines.
3. Connect the gauge set hoses to the high and low-pressure service ports
of the AC system. The high-pressure side is typically marked with red, and
the low-pressure side with blue. Choose the appropriate adapter for the
refrigerant system and fitting.
4. Shut the valves on the gauge set and attach the hoses from the vacuum
pump to the gauge set. Switch on the vacuum pump and allow it to run for
a few minutes to ensure that it is functioning correctly.
5. Open the valves on the gauge set and allow the vacuum pump to
operate until the system pressure reaches approximately 30 inchHg and
stabilizes. Continue pumping for at least 30 minutes to ensure that all
remaining air is removed.
6. Shut the valves on the gauge and switch off the vacuum pump. Allow
the system to rest for approximately 30 minutes, as recommended, to
confirm that there are no leaks. Any increase in the pressure displayed on
the gauge set implies the presence of a leak.
7. Once you are convinced that there are no leaks and have attained the
desired vacuum level, you can either charge the refrigerant or close the
valve for future use.
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