Midea TempMaker Series Technical Manual page 82

R410A 380~415V 3Ph 50Hz TempMaker Series Split AC
must be filled in. Otherwise, the oxidized chips may block refrigerating circulatory system.

Trash and foreign matters may come into the pipe in the process of installing the refrigerant pipe.
Be sure to blow them off with nitrogen before connecting the pipe to the outdoor units.

Use high-pressure nitrogen to clean the pipelines. Do not use the refrigerant of the outdoor unit
for cleaning.

Pipes size of the units.
MOV-120HN1-R
MOV-150HN1-R
MOV-192HN1-R

All connections between indoor unit and outdoor unit are copper-to copper and should be brazed
with a phosphorous-copper alloy material such as Silfos-5 or equivalent. Do not use soft solder.
The outdoor units have reusable valves on both the liquid and vapor connections. The total
system refrigerant charge is retained within the outdoor unit during shipping and installation. The
reusable valves are provided to evacuate and charge per the instruction.

Dry nitrogen should always be supplied through the tubing while it is being brazed, because the
temperature required is high enough to cause oxidation of the copper unless an inert
atmosphere is provided. The flow of dry nitrogen should continue until the joint has cooled.
Always use a pressure regulator and safety valve to insure that only low pressure dry nitrogen is
introduced into the tubing. Only a small flow is necessary to displace air and prevent oxidation.

Install the connective pipe only after fixing the indoor unit and outdoor unit. Keep dry when
installing the connective pipe. Do not let moist intrude into the pipeline system.
81
Outdoor units
MOV-76HN1-R
MOV-96HN1-R
Liquid pipe
Φ9.52mm
Φ9.52mm
Φ12.7mm
Φ16mm
Φ16mm
MCAC-UTSM-2014-03
Gas pipe
Φ22mm
Φ25mm
Φ28.6mm
Φ32mm
Φ32mm