Midea MFGA-60ARDN1-QC2 Service Manual page 19

2-way and 3-way valves are set to the closed position
2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas
service port..
3) Connect the charge hose of handle hi connection to the vacuum pump.
4) Fully open the handle Lo of the manifold valve.
5) Operate the vacuum pump to evacuate.
6)
Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa.
If the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20
minutes more. If the pressure can't achieve -0.1Mpa after pumping 50 minutes, please check if
there are some leakage points.
Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum
pump. Confirm that the gauge needle does not move (approximately 5 minutes after
turning off the vacuum pump).
7) Turn the flare nut of the 3-way valves 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. Then remove the
charge hose from the 3 way valve.
8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way
valve.
2. Air purging by refrigerant
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