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Midea R410A Full DC Inverter Split Type Series Technical Manual
Pipe diameters are for lengths up to 50 equivalent meter and/or 25m vertical differential. Do not
increase or decrease pipe sizes.
Pipe set and indoor can be pressurized, to 250 psig with dry nitrogen and leak tested with a
bubble type leak detector. Than release the nitrogen charges. Do not use the system refrigerant
in the outdoor unit to purge or leak test.
Precautions should be taken to prevent heat damage to service valve by wrapping a wet rag
around it. Also, protect all painted surfaces, insulation, during brazing. After brazing cool joint
with wet rag.
Remove the cap and Schrader core from both the liquid and vapor service valve service ports at
the outdoor unit. Connect low pressure nitrogen to the liquid line service port.
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.
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MCAC-UTSM-201406
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