40
Refrigerant pipe installation
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 .
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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 capacity [kW (MBH)]
Branch pipe length within 45 m
(147.64 ft)
note1)
Branch pipe length between 45~90 m
(147.64~295.28 ft)
note1)
Liquid pipe
[mm (inch)]
Gas pipe
[mm (inch)]
Liquid pipe
[mm (inch)]
Gas pipe
[mm (inch)]
15 .0 kW (51 .2 MBH) and below
Ø 9 .52 (3/8)
Ø 15 .88 (5/8)
Ø 12 .70 (1/2)
Ø 19 .05 (3/4)
Over 15 .1 kW~22 .4 kW
(51 .3 ~ 76 .4 MBH) and below
Ø 19 .05 (3/4)
Ø 22 .22 (7/8)
Over 22 .5 kW~28 .1 kW
(76 .5 ~ 95 .9 MBH) and below
Ø 22 .22 (7/8)
Ø 25 .40 (1)
note2)
Over 28 .2 kW~40 .0 kW
(96 .0 ~ 136 .5 MBH) and below
Ø 12 .70 (1/2)
Ø 28 .58 (1 1/8)
Ø 15 .88 (5/8)
Ø 28 .58 (1 1/8)
Over 40 .1 kW~45 .0 kW
(136 .6 ~ 153 .5 MBH) and below
Ø 31 .75 (1 1/4)
note3)
Over 45 .1 kW~63 .3 kW
(153 .6 ~ 216 .0 MBH) and below
Ø 15 .88 (5/8)
Ø 19 .05 (3/4)
Over 63 .4 kW~70 .3 kW
(216 .1 ~ 239 .9 MBH) and below
Ø 34 .92 (1 3/8)
Ø 38 .10 (1 1/2)
note4)
Over 70 .4 kW~98 .4 kW
(240 .0 ~ 335 .8 MBH) and below
Ø 19 .05 (3/4)
Ø 22 .22 (7/8)
Over 98 .5 kW~135 .2 kW
(335 .9 ~ 461 .3 MBH) and below
Ø 41 .28 (1 5/8)
Ø 41 .28 (1 5/8)
Over 135 .3 kW~169 .0 kW
(461 .4 ~ 576 .7 MBH) and below
Ø 53 .98 (2 1/8)
Over 169 .0 kW (576 .7 MBH)
Ø 22 .22 (7/8)
Ø 53 .98 (2 1/8)
Ø 25 .40 (1)
note2)
Note1)
Note on measuring distance between branch joints (B) :
You must measure the distance between first branch joint
to the last indoor unit . (NOT from first joint to the last branch joint
Note2) If Ø 25 .40 mm (Ø 1”) pipe is not available on site, use Ø 28 .58 mm (Ø 1 1/8”) pipe .
Note3) If Ø 31 .75 mm (Ø 1 1/4”) pipe is not available on site, use Ø 34 .92 mm (Ø 1 3/8”) pipe .
Note4) If Ø 38 .10 mm (Ø 1 1/2”) pipe is not available on site, use Ø 41 .28 mm (Ø 1 5/8”) pipe .