SAFARI

35 AIRCONDITIONING CHARGING THE A/C SYSTEM: 1. Installation of Manifold Gauge a Close both the high and low hand valves of the manifold gauge. b Connect the low pressure hose to the low pressure charging valve and the high pressure hose to the high pressure charging valve.Tighten the hose nuts by hand. Important Do not apply compressor oil to the seats of the connection. 2. Evacuate Air in Refrigeration System a. Connect the center hose of the gauge set to the vacuum pump inlet. b. Open both the high and low hand valves and run the vacuum pump. If opening the low pressure hand valve pulls the high pressure gauge into the vacuum range, there is no blockage in the system. c. After about ten minutes, check that the low pressure gauge indicates more than 600 mmHg (23.62 in Hg, 80.0 kPa) of vacuum. If the reading is not more than 600 mmHg (23.62 in Hg, 80.0 kPa), close both valves and stop the vacuum pump. Check the system for leaks and repair as necessary. If no leaks are found, continue evacuating the air in the system. d. Continue evacuating the air in the system until the low pressure gauge indicates a vacuum of 750 mmHg (29.53 in Hg, 99.98 kPa). e. Close both the high and low hand valves and stop the vacuum pump, then leave the system in this condition for five minutes or longer and check that there is no change in the gauge indication. CLOSED OPEN AIR OPEN CLOSED Fig. 49 Fig. 50