Midea MFM-24ARN1-Q Service Manual page 23

DM16-01.01.25en
5). Discharge the refrigerant.
Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut
on the 2-way valve approximately 45' until the gauge indicates 0.3 to 0.5 Mpa.
6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to
the open position.
Be sure to use a hexagonal wrench to operate the valve stems.
7). Mount the valve stems nuts and the service port cap.
Be sure to use a torque wrench to tighten the service port cap to a torque 18N∙m.
Be sure to check the gas leakage.
3. Adding the refrigerant if the pipe length >5m
Electronic scale
Procedure:
1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way
valve.
Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom
of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure the liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge
the air (be careful of the liquid refrigerant).
3) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner at the cooling mode.
23
Floor Standing MFM
Service manual