14
Refrigerant pipe installation
Selecting Y-joint
X Select the rst Y-joint according to main pipe size of each outdoor unit capacity.
X Select the other Y-joints according to the total indoor unit capacity under the selected Y-joint.
Selecting the rst Y-joint Other Y-joints
Outdoor unit capacity
[HP(Ton)]
Y-joint model
Total indoor unit capacity under the
selected Y-joint [kW (Btu/h)]
Y-joint model
7(5) MXJ-YA2512✴
X ≤ 15.0 (51000) MXJ-YA1509✴
15.0 (51000) < X ≤ 40.6 (138000) MXJ-YA2512✴
Keeping refrigerant pipe
To prevent foreign materials or water from entering the pipe, it is important to keep the refrigerant pipe clean and dry and to
seal it during installation.
Apply correct sealing method depending on the environment.
Exposure place Exposure time Sealing type
Outside exposure
Longer than one month Pipe pinch
Shorter than one month Taping
Inside exposure - Taping
Refrigerant pipe brazing and safety information
Important information for refrigerant pipe work
X Make sure that there is no moisture inside the pipe.
X Make sure that there are no foreign materials and impurities in the pipe.
X Make sure that there is no leak.
X Make sure to follow the instruction when brazing and keeping the pipe.
Nitrogen ushing brazing
X Use Nitrogen gas when brazing the pipes as shown in the picture.
X If you do not perform nitrogen ushing when brazing the pipes, oxide may form inside the pipe. It can cause the damage
of the important parts such as compressor, valves.
X Adjust the ow rate of the Nitrogen ushing with a pressure regulator to maintain 0.05m3/h or less.
Brazing part
Nitrogen gas
Ø6.35(1/4") copper pipe
Shut-o
valve
Taping
Flow meter
High pressure hose
Pressure regulator
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