Midea MISSION2 3D INVERTER Series, Service Manual

Page: 32 / 113

Maintenance and
Disassembly
 Page 28 
Refrigerant charging
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Note: 1. Mechanical connectors used indoors shall comply with local regulations.
2. When mechanical connectors are reused indoors, sealing parts shall be renewed. When flared joints
are reused indoors, the flare part shall be re-fabricated.
Procedure:
1.
Tighten the flare nuts of the indoor and outdoor
units, and confirm that both the 2- and 3-way valves
are closed.
2.
Slightly connect the Handle Lo charge hose to the
3-way service port.
3.
Connect the charge hose to the valve at the bottom
of the cylinder.
If the refrigerant is R410A, invert the cylinder to
ensure a complete liquid charge.
4.
Partially open the Handle Lo manifold valve.
5.
Open the valve at the bottom of the cylinder for 5
seconds to purge the air in the charge hose, then fully
tighten the charge hose with the push pin of Handle
Lo to the gas service port of the 3-way valve.
6.
Place the charging cylinder onto an electronic scale
and record the starting weight.
7.
Fully open the Handle Lo manifold valve, 2- and
3-way valves.
8.
Operate the air conditioner in cooling mode and
charge the system with liquid refrigerant.
9.
When the electronic scale displays the correct weight
(refer to the gauge and the pressure of the low
side to confirm), turn off the air conditioner, then
disconnect the charge hose from the 3-way service
port immediately..
10.
Mount the caps of service port and 2- and 3-way
valves.
11.
Use a torque wrench to tighten the caps to a torque
of 18N.m.
12.
Check for gas leakage.