Midea MFE-60ARN1-RB4W Service Manual page 20

1. Air purging with vacuum pump
(Indoor unit)
Compound meter
-0.1MPa
Handle Lo
Charge hose
Vacuum
pump
Vacuum
pump
1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the
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
(Liquid side)
(Gas side)
Manifold valve
Pressure
gauge
Lo Hi
Handle Hi
Charge hose
17
(Outdoor unit)
Two-way valve
Close
Three-way valve
Close