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6
Refrigerant piping works
Pipe size between branch joints : (B) Tempers of pipe
Select the pipe size according to the capacity sum of indoor units
which are connected below this pipe.
Pipe size between branch joints and indoor unit (C)
Select the pipe size according to the indoor unit’s capacity.
Branch joiat : (D), (E), (F)
Branch joint of outdoor unit’s multi connection (D)
First branch joint (E)
Select branch joint according to the outdoor unit’s capacity.
Branch joint (F)
Select the pipe size according to the capacity sum of
indoor units which are connected below this pipe.
1) Y-joint
2) Header joint
Total Indoor unit’s
capacity
Pipe size (O.D)
Liquid Gas
mm inches mm inches
51MBH
Ø9.52 Ø3/8
Ø15.88 Ø5/4
51~79MBH Ø19.05 Ø3/4
79~96MBH Ø22.23 Ø7/8
96~138MBH
Ø12.70 Ø1/2
Ø28.58 Ø1-1/8138~160MBH
160~240MBH Ø15.88 Ø5/8
240~336MBH
Ø19.05 Ø3/4 Ø34.93 Ø1-3/8
336~468MBH
Indoor unit’s
capacity
Pipe size (O.D)
Liquid Gas
mm inches mm inches
6~20MBH Ø6.35 Ø1/4 Ø12.70 Ø1/2
24~48MBH Ø9.52 Ø3/8 Ø15.88 Ø5/8
Outdoor multi
connection
Model
Capacity of outdoor
unit
branch joint (D) MXJ-T3819K 12 ~ 30 Ton
Y-joint
(E)
Model
Capacity of outdoor unit
MXJ-YA2512K 6, 8,10 Ton
MXJ-YA2812K 12 Ton
MXJ-YA2815K 14,16,18,20 Ton
MXJ-YA3119K 22, 24, 26, 28 Ton
MXJ-YA3819K 30 Ton
Header
joint
(F)
Model
Total Indoor unit’s
capacity
The connect-
able quantity of
indoor units
MXJ-HA2512K
160 MBH and below
4
MXJ-HA3115K
Over 160 MBH~ 240 MBH
8
MXJ-HA3819K
Over 240 MBH
8
Pipe size Thickness
Material
mm inches mm inches
Ø6.35 Ø1/4
0.7 0.027
C1220T-O
(Annealed)
Ø9.52 Ø3/8
Ø12.70 Ø1/2 0.8 0.031
Ø15.88 Ø5/8 1.0 0.039
Ø19.05 Ø3/4
0.9 0.035
C1220T-1/2H
(Drawn temper)
Ø22.23 Ø7/8
Ø25.40 Ø1 1.0 0.039
Ø28.58 Ø1-1/8
1.1 0.043
Ø31.75 Ø1-1/4
Ø34.93 Ø1-3/8 1.2 0.047
Ø38.10 Ø1-1/2 1.35 0.053
Ø44.45 Ø1-3/4 1.6 0.062
Ø50.80 Ø2 2.0 0.079
Y-joint
(F)
Model Capacity of outdoor unit
MXJ-YA1509K
51 MBH and below
MXJ-YA2512K
Over 51 MBH ~ 138 MBH and below
MXJ-YA2812K
Over 138 MBH ~ 160 MBH and below
MXJ-YA2815K
Over 160 MBH ~ 240 MBH and below
MXJ-YA3119K
Over 240 MBH ~ 336 MBH and below
MXJ-YA3819K
Over 336 MBH ~ 468 MBH and below
Make sure to use C1220T-1/2H pipe for more than
Ø19.05mm(3/4
in
). In case of using C1220T-O pipe
for Ø19.05mm(3/4
in
) pipe may be broken, which
can result in an injury.
CAUTION
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