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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.
6. Turn the stem of the Hi valve a
bout 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.
8. Fully open the Hi and Lo packed valve.
9. Securely tighten the cap of the packed valve.
Gas leak check
Soap water method
Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor
unit connections by a soft brush to check for leakage of the connecting points of the piping.
If bubbles come out, the pipes have leakage.
5.3.4 Pumping down (Re-installation)
