Midea Tropical R410A High Efficient Duct Technical Manual 50Hz MCAC-UTSM-201707
85
Braze the liquid line to the 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 refrigerant pipe size list
for proper liquid line sizing.
Carefully remove the rubber plugs from the evaporator liquid and suction connections at the
indoor coil.
Braze the liquid line to the evaporator liquid connection. Nitrogen should be flowing through
the evaporator coil.
Slide the plastic cap away from the suction connection at the indoor coil. Braze the suction
line to the evaporator suction connection.
Protect the suction valve with a wet rag and braze the suction line connection to the outdoor
unit. The nitrogen flow should be exiting the system from the suction 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 suction valves.
Leak test all refrigerant piping connections including the service port flare caps to be sure
they are leak tight.
Do not over tighten; it should be between 40 and 60 inch – lbs. maximum.
Evacuate the suction line, evaporator, and the liquid line, to 350 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.
Release the refrigerant charge into the system. Open both the liquid and suction valves by
removing the plunger cap and with an hex wrench back out counter-clockwise until valve
stem just touches the chamfered retaining wall.
Replace plunger cap finger tight, then tighten an additional 1/12 turn (1/2 hex flat).
Cap must be replaced to prevent leaks.
Install the lines with as few bends as possible. Care must be taken not to damage the
coupling or kink the tubing. Use clean hard drawn copper tubing where no appreciable
amount bending around obstruction is necessary, if soft copper must be used, care must be
taken to avoid sharp bends which may cause a restriction.
The refrigerant pipe cannot obstruct service access to the condenser, air handling system or
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