Midea MOAB30-09HFN8-QRD0GW, Service Manual

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 Maintenance 8 
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.
Close both 2- and 3-way valves.
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.
4.
If the refrigerant is R410A/R32, invert the cylinder to
ensure a complete liquid charge.
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 push pin Handle Lo to
the service port of 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 to 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, the value of pressure refers to
chapter Appendix), 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 18 N.m.
12.
Check for gas leakage.