AA
18
Install the refrigerant pipe according to main pipe size of each outdoor unit capacity.
When the pipe length (including elbow) between an outdoor unit and the farthest indoor unit exceeds 90m, you
must increase the size of the gas pipe (main pipe) by one grade which connects between the outdoor unit to the rst
branch joint. (The liquid pipe size will be maintained.)
If the capacity of the outdoor unit can decline due to the pipe length, upgrade the pipe size one step (gas pipe).
Size of the pipe between branch joints
Inddor unit capacity
[kW]
Liquid pipe
[mm]
Gas pipe
[mm]
15.0 kW and below
Ø
9.52
Ø
15.88
Over 15.0 kW ~ 22.4 kW and below
Ø
19.05
Over 22.4 kW
Ø
22.23
Selection of branch joint
Selection of the rst branch joint
Selection of the other branch joint according to the sum of indoor unit capacity which
will be connected after the branch
Outdoor unit capacity
[HP]
Model name
Classication
Indoor unit capacity
[kW]
Model name
8 MXJ-YA2512M
Y-joint
15.0 kW and below MXJ-YA1509M
9
MXJ-YA2512M Over 15.0 kW ~ 40.0 kW and below MXJ-YA2512M
Distribution
Header
45.0 kW and Below (for 4 rooms) MXJ-HA2512M
70.3 kW and below (for 8 rooms) MXJ-HA3115M
Increase the main pipe size
First branch joint
Installation of Air-conditioner
Selecting refrigerant pipe
Selecte the pipe size according to the sum of indoor unit capacity which will be connected after the branch.
Outdoor unit capacity [HP] Liquid pipe [mm] Gas pipe [mm] Increased gas pipe [mm]
8
Ø
9.52
Ø
19.05
Ø
22.23
9
Ø
9.52
Ø
19.05
Ø
22.23
Size of the between the outdoor unit and the rst branch joint
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