Midea TempMaker Series, Technical Manual

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R410A 380~415V 3Ph 50Hz TempMaker Series Split AC MCAC-UTSM-2014-03
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
Braze the liquid line to the high pressure valve (liquid valve) at the outdoor unit. Be sure to wrap
the valve body with a wet rag. Allow the nitrogen to continue flowing.

Carefully remove the rubber plugs from the evaporator liquid and vapor connections at the
indoor unit.

Braze the liquid line to the indoor liquid connection. Nitrogen should be flowing through the
evaporator coil.

Slide the plastic cap away from the vapor connection at the indoor coil. Braze the vapor line to
the evaporator vapor connection.

Protect the vapor valve with a wet rag and braze the vapor line connection to the outdoor unit.
The nitrogen flow should be exiting the system from the vapor service port connection. After this
connection has cooled, remove the nitrogen source from the liquid fitting service port.

Replace the Schrader core in the liquid and vapor valves.

Leak test all refrigerant piping connections including the service port flare caps to be sure they
are leak tight.

Do not over tighten. (between 40 and 60 inch-lbs. maximum)

Evacuate the vapor line, evaporator and the liquid line, to 500 microns or less.

Replace cap on service ports. Do not remove the flare caps from the service ports except when
necessary for servicing the system.

Do not connect manifold gauges unless trouble is suspected. Approximately 3/4 ounce of
refrigerant will be lost each time a standard manifold gauge is connected.

Release the refrigerant charge into the system. Open both the liquid and vapor valves by
removing the plunger cap and with a hex wrench back out counter-clockwise until valve stem