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10. Installation
16Ton
12Ton
(A)
(1)
(B)
Size of the pipe connected to the outdoor unit (A)
Select the size of the main pipe according to the below table.
*Maximum pipe length within
Outdoor unit
Outdoor unit
capacity (MBH)
capacity (kW)
Liquid
(Cooling)
(Cooling)
inch
Ø3/8
Ø1/2
Ø5/8
Ø3/4
*Maximum pipe length : The pipe length between an outdoor unit and the farthest indoor unit.
Note1) If Ø1" (25.40mm) pipe is not available on site, use Ø1 1/8" (28.58mm) pipe.
Note2) If Ø1 1/4" (31.75mm) pipe is not available on site, use Ø1 3/8" (34.92mm) pipe.
Note3) If Ø1 1/2" (38.10mm) pipe is not available on site, use Ø1 5/8" (41.28mm) pipe.
⸀ For the case that the diameter of the default pipe of an outdoor unit does not match that of the pipe
installed on the site, a socket is provided by default together with the outdoor unit.
Size of the pipe between branch joints (B)
Select the pipe size according to the sum of indoor unit capacity which will be connected after the branch.
⸀ However, if the size of the pipe between branch joints (B) is bigger than the size of the pipe connected to
the outdoor unit (A), apply the pipe size (A).
Indoor unit
Indoor unit
capacity (MBH)
capacity (kW)
Liquid
inch
Capacity < 19
Capacity < 5.7
Ø1/4
Ø3/8
Ø1/2
Ø5/8
< 100.8
Ø3/4
Ø7/8
Ø1
note1)
Note1) If Ø1" (25.40mm) pipe is not available on site, use Ø1 1/8" (28.58mm) pipe.
Note2) If Ø1 1/4" (31.75mm) pipe is not available on site, use Ø1 3/8" (34.92mm) pipe.
Note3) If Ø1 1/2" (38.10mm) pipe is not available on site, use Ø1 5/8" (41.28mm) pipe.
Note4) If Ø1 3/4" (44.45mm) pipe is not available on site, use Ø2 1/8" (53.98mm) pipe.
6Ton
(D)
(3)
(2)
(E)
(C)
*Maximum pipe length over
295ft (90m)
295ft (90m)
Gas
Liquid
mm
inch
mm
inch
mm
inch
Ø3/4 Ø19.05
Ø7/8 Ø22.22
Ø9.52
Ø1/2
Ø12.70
Ø7/8 Ø22.22
Ø1
Ø1 1 /8
Ø12.70
Ø5/8
Ø15.88
Ø1 1/8 Ø28.58
Ø1 1/4
note2)
Ø15.88
Ø3/4
Ø19.05
Ø1 3/8 Ø34.92
Ø1 3/8 Ø34.92
Ø1 1/2
note3)
Ø19.05
Ø7/8
Ø22.22
Ø1 5/8 Ø41.28
Ø1 5/8
Branch pipe length within
Branch pipe length between
148ft (45m)
148ft~295ft (45~90m)
Gas
Liquid
mm
inch
mm
inch
mm
inch
Ø6.35
Ø1/2
Ø12.70
Ø3/8
Ø9.52
Ø5/8
Ø5/8
Ø15.88
Ø3/4
Ø3/4
Ø19.05
Ø7/8
Ø9.52
Ø1/2
Ø12.70
Ø7/8
Ø22.22
Ø1
Ø1 1/8 Ø28.58
Ø12.70
Ø5/8
Ø15.88
Ø1 1/8 Ø28.58
Ø1 1/4
note2)
Ø15.88
Ø3/4
Ø19.05
Ø1 3/8 Ø34.92
Ø1 3/8 Ø34.92
Ø1 1/2
note3)
Ø19.05
Ø7/8
Ø22.22
Ø1 5/8 Ø41.28
Ø1 5/8 Ø41.28
Ø1 3/4
note4)
Ø1 3/4
Ø44.45
Ø25.40
Ø22.22
Ø1
note1)
note4)
note4)
note1)
Ø2 1/8 Ø53.98
Ø2 1/8 Ø53.98
Ø25.40
Ø1 1/8 Ø28.58
note1)
Ex.) 34 Ton
Ton
No.
(F)
16
(1)
28
(2)
34
(3)
Branch joint between outdoor units (C)
Select a branch joint according to the sum of the capacity of outdoor units connected to the
branch joint.
Gas
Classification
mm
Ø25.40
Y-joint for outdoor
note1)
unit (C)
note1)
Ø28.58
First branch joint (D)
Select according to the sum of the capacity of the outdoor unit.
Ø31.75
note2)
Classification
Ø38.10
note3)
Ø41.28
Y-joint (D)
Branch joint (E)
Select a branch joint according to the sum of indoor unit capacity which will be connected
after the branch.
joint of the same size as the first branch joint (D).
Classification
Capacity < 55
Gas
mm
Y-joint (E)
Ø15.88
Ø19.05
Ø22.22
Ø25.40
478 < Capacity
note1)
note1)
Capacity < 172 (for 4 rooms)
Distribution
Capacity < 248 (for 8 rooms)
header (E)
Ø31.75
Capacity < 478 (for 8 rooms)
note2)
Ø38.10
Size of the pipe between the branch joint and the indoor unit (F)
note3)
Select according to the capacity of the indoor unit.
Ø44.45
Indoor unit capacity
note4)
MBH
78 < Capacity
⸀ If the criteria for selecting the branch in the outdoor installation manual and the branch installation
manual are different, please select the branch in accordance with the outdoor installation manual.
Pipe size (O.D)
Liquid pipe
mm
inch
mm
15.88
5/8
28.58
19.05
3/4
34.92
19.05
3/4
41.28
Branch joint (C~E)
Outdoor unit capacity
MBH
kW
578
248
467 < Capacity
137 < Capacity
Outdoor unit capacity
MBH
kW
251
52
271
58
349
81
447
99
578
248
467 < Capacity
137 < Capacity
Indoor unit capacity
MBH
kW
Capacity < 16
140 < Capacity
Capacity < 50.4 (for 4 rooms)
Capacity < 72.8 (for 8 rooms)
Capacity < 140 (for 8 rooms)
Liquid
kW
inch
mm
Ø1/4
Ø6.35
Ø3/8
Ø9.52
Ø3/8
Ø9.52
Ø3/8
Ø9.52
Gas pipe
inch
1 1/8
1 3/8
1 5/8
Model name
MXJ-TA3819M
MXJ-TA4422M
Model name
MXJ-YA2512M
MXJ-YA2812M
MXJ-YA2815M
MXJ-YA3419M
MXJ-YA4119M
MXJ-YA4422M
Model name
MXJ-YA1509M
MXJ-YA2512M
MXJ-YA2812M
MXJ-YA2815M
MXJ-YA3419M
MXJ-YA4119M
MXJ-YA4422M
MXJ-HA2512M
MXJ-HA3115M
MXJ-HA3819M
Gas
inch
mm
Ø1/2
Ø12.7
Ø5/8
Ø15.88
Ø3/4
Ø19.05
Ø7/8
Ø22.22
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