Midea MTB1T-96CWN1 Technical & Service Manual page 63

MCAC-UTSM-201707

As shown in following picture, when brazing the indoor and outdoor connective lines, pad a
sheet metal under the valve avoids the flame burning the chassis.

Precaution should be taken to prevent heat damage the service valve by wrapping a wet rag
around it as shown in following picture. Also, protect all painted surfaces, insulation, during
brazing. Cool joint with rag after brazing.

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. Refer to the
Tabular Data Sheet for proper liquid line sizing.

Remove the rubber plugs from the evaporator liquid and vapor connections at the indoor
unit carefully.

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.
Midea R410A T3 50Hz Top-discharge Series
62