Note. Every time the system is opened, a vacuum must be created to protect against air and moisture ingress. After installing any element, a vacuum should be maintained in the system for approximately 15 minutes. System elements opened for repair must be under vacuum for 30 minutes.
1. Turn off the engine.
2. Attach a set of control pressure gauges to the compressor fittings. Close the high and low pressure valves.
3. Make sure that the refrigerant from the system is drained.
4. Connect the center hose of the gauge set to the vacuum pump inlet.
5. Turn on the vacuum pump and open the high and low pressure valves.
6. After approximately 10 minutes, verify that the low pressure gauge shows a vacuum below 94.39 kPa. If vacuum cannot be obtained, this indicates a leak in the system. In this case, repair the leak as follows:
- 1) Close both valves of the pressure gauge set and turn off the vacuum pump.
- 2) Charge the system with refrigerant from a container (approx. 0.4 kg), as indicated in the section «Refrigerant charge».
- 3) Determine the location of the leak with the help of a leak detector. Fix the leak (see section «System leak test»).
- 4) Drain the refrigerant again and create a vacuum in the system. If no leaks are found, continue to create a vacuum in the system.
7. Turn on the vacuum pump.
8. Open both valves of the pressure gauge set until a vacuum of 94.39 kPa is created.
9. After the low pressure gauge shows a vacuum of about 94.39 kPa, continue to create a vacuum for 15 minutes.
10. After 15 minutes of system under vacuum, close both valves of the pressure gauge set and turn off the vacuum pump. Disconnect the hose from the vacuum pump. The system is ready to be charged with refrigerant.