14
Air purging with vacuum pump
1. Completely tighten the flare nuts of the indoor and outdoor units, connect the manifold
valve charge.
2. Connect the charge hose connection to the vacuum pump.
3. Fully open the handle Lo of the manifold valve.
4. Operate the vacuum pump to evacuate. After starting evacuation, slightly loose the flare
nut of the Lo valve on the gas pipe side and check the air is entering. (Operation noise of
the vacuum pump changes and a compound meter indicates 0 stead of minutes)
5. After the evacuation is complete, fully close the handle Lo valve of the manifold valve
and stop the operation of the vacuum pump. Make evacuation for 15 minutes or more and
check the compound meter indicates -76cmHg(-1x10
5
Pa).
6. Turn the stem of the Hi valve about 45°counterclockwise for 6 or 7seconds after the gas
coming out, then tighten the flare nut again. Make sure the pressure display in the
pressure indicator is a little higher than the atmosphere pressure.
7. Remove the charge hose from the Lo pressure charge hose.
