Installation For The First Time - Midea MFGA-60ARDN1-QC2 Service Manual

5.3.3 Installation for the first time

Air and moisture in the refrigerant system have undesirable effects as below:
Pressure in the system rises.
●
Operating current rises.
●
Cooling or heating efficiency drops.
●
Moisture in the refrigerant circuit may freeze and block capillary tubing.
●
Water may lead to corrosion of parts in the refrigerant system.
●
Therefore, the indoor units and the pipes between indoor and outdoor units must be
leak tested and evacuated to remove gas and moisture from the system.
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.
1. Air purging with vacuum pump
(Indoor unit)
Compound meter
20Pa
Handle Lo
Charge hose
Vacuum
pump
Vacuum
pump
1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the
(Liquid side)
(Gas side)
Manifold valve
Pressure
gauge
Lo Hi
Handle Hi
Charge hose
15
(Outdoor unit)
Two-way valve
Close
Three-way valve
Close