Indoor unit’s capacity
Pipe size (O.D. mm)
Liquid pipe Gas pipe
2.2~5.6 kW ø6.35 ø12.70
7.1~14.0 kW ø9.52 ø15.88
Model Capacity of outdoor
MXJ-T3819K Below 48 HP
MXJ-T4422K Above 50 HP
A1 : Select the pipes according to the outdoor unit
capacity with following table.
A2 : Select the pipes according to sum of outdoor
unit capacities behind the outdoor joint with
following table.
A3 : Select the main pipe of outdoor units with the
following table.
Pipe size between branch joints : (B)
Pipe size between branch joints and indoor unit (C)
ø6.35
Outdoor multi
connection
branch joint (D)
Select the pipe size according to the indoor's capacity.
■ Branch joint of outdoor unit’s multi connection (D)
Outdoor unit Model
8, 10, 12, 14 HP MXJ-YA2512K
16 HP MXJ-YA2812K
18, 20, 22, 24HP MXJ-YA2815K
26, 28, 30, 32, 34HP MXJ-YA3119K
36, 28, 40, 42, 44, 46, 48HP
MXJ-YA3819K
50HP~ MXJ-YA4422K
Model Total indoor unit’ capacity
MXJ-YA1509K 15.0 kW and below
MXJ-YA2512K Over 15.0~40.6 kW and below
MXJ-YA2812K Over 40.6~46.4 kW and below
MXJ-YA2815K Over 46.4~69.6 kW and below
MXJ-YA3119K Over 69.6~98.6 kW and below
MXJ-YA3819K Over 98.6~139.2 kW and below
MXJ-YA4422K Over 139.2 kW
Y-joint
(E)
Y-joint
(F)
■ 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
Model
Total Indoor The connectable
unit’s
quantity of
capacity indoor units
MXJ-HA2512K
0~46.4 kW
and below
4
MXJ-HA3115K
0~69.6k W
and below
8
MXJ-HA3819K
Over 69.6 kW 8
Header
joint
(F)
2) Header joint
Total Indoor unit’s capacity
Pipe size (O. D. mm)
Liquid pipe Gas pipe
15.0 kW and below ø15.88
Over 15.0~23.2 kW and below ø9.52 ø19.05
Over 23.2~29.0 kW and below ø22.23
Over 29.0~40.6 kW and below
ø12.70
ø25.40
Over 40.6~46.4 kW and below
ø28.58
Over 46.4~69.6 kW and below ø15.88
Over 69.6~98.6 kW and below
ø19.05
ø31.75
Over 98.6~139.2 kW and below ø38.10
Over 139.2 kW ø22.23 ø44.45
Select the pipe size according to the capacity sum
of indoor units which are connected below this pipe.
12Hp
(A1)
(A1)
(A2)
(A1)
(F)
(D)
(A3)
(E)
(B)
(C)
14Hp 16Hp
1-7. Refrigerant piping works
4) Pipe selection
HP Mark
Pipe size(O. D. mm)
Liquid Gas
12 HP (A1) ø12.70 ø25.40
14 HP (A1) ø12.70 ø25.40
16 HP (A1) ø12.70 ø28.58
26 HP (A2) ø19.05 ø31.75
42 HP (A3) ø19.05 ø38.10
Outdoor unit
Pipe size (O.D. mm)
Oil balancing
Liquid Gas
pipe size
8HP
ø9.52
ø19.05
10HP ø22.23
12HP
ø25.40
14HP ø12.70
16HP
18HP
20HP
ø15.88
ø28.58
22HP
24HP
26~30HP
32~34HP ø19.05
ø31.75
36~48HP ø38.10
50~64HP ø22.23 ø44.45
*A1 : Pipes to the outdoor unit (Liquid, Gas)
*A2 : Pipes between outdoor joint kits (Liquid, Gas)
*A3 : Main pipes (Liquid, Gas)
❈
Example) 42HP of compact
combinations
06_Installation(02~45) 3/15/08 4:34 Page 22
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