Midea MTA-76C(H)RN1 Technical Manual page 83

MCAC-UTSM-201501

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, rotate the square-head
spool of valve B counter-clockwise for 45 degrees and 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 maintenance orifice nut of valves A
and B.

Connect the filler hose of 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.

Loosen 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. After all the filled refrigerant is expelled, screw up the
maintenance orifice nut of valve A quickly.

Open the square-head pools of valves A and B completely.

Tighten the square-head cover of valves A and B.
Midea R410A T3 Top-discharge Split Type Series 50Hz
82