Midea MFE-60ARN1-RB4W Service Manual page 26

2). Connect the charge set and a charging cylinder to the service port of the 3-way
valve
Leave the valve on the charging cylinder closed.
3). Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by
loosening the flare nut on the 2-way valve approximately 45' for 3 seconds then closing
it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.
4). Check the gas leakage
Check the flare connections for gas leakage.
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.
5.3.6 Re-installation while the outdoor unit need to be repaired
1. Evacuation for the whole system
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