Midea MTA1-76HR Technical Manual page 34

MCAC-RTSM-201301-01
Expel air by refrigerant

Use the refrigerant in the outdoor unit to expel air.

Screw up the pipe nuts at A, B, C and D completely.

Loosen and remove the square-head cover of valves A and B, and rotate the square-head
spool of valve B counterclockwise for 45 degrees.

Stay for about 10 seconds, and then close the spool of valve B tightly.

Detect leak for all adapters at A, B, C and D. After making sure that no leak exists, open the
maintenance orifice nut of valve A.

After all air is expelled, tighten the maintenance orifice nut of valve A.

Open the spools of valves A and B completely.

Tighten the square-head cover of valves A and B completely.

Use refrigerant tank to expel air.

Screw up the pipe nuts at A, B, C and D completely.

Loosen and remove the square-head cover and the maintenance orifice nut of valves A and
B.

Connect the filler hose of the refrigerant tank with the maintenance orifice of valve A.

Loosen the valve of the refrigerant tank, continue filling refrigerant for 6 seconds to expel the
air, and tighten the nut of valve B quickly.

Loose the valve of the refrigerant tank again, and fill the refrigerant for 6 seconds. Detect
leak for all adapters at A, B, C and D.

After making sure that no leak exists, screw off the filler hose, and after all the filled
refrigerant is expelled, screw up the maintenance orifice nut of valve A quickly.

Open the square-head spools of valves A and B completely.

Tighten the square-head cover of valves A and B.
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