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ENGLISH
Installation Manual 31
Refrigerant piping installation
Ú Refrigerant pipe diameter between branches and HR units (B,C,D)
Ú
Total pipe length (A+B+C1+C2+C3+D+a+b+c+d+e+f+g+i+j+k) ≤ 1,000m(3,280ft)
Downward indoor unit total capacity
[kW(Btu/h)]
≤ 5.6 (19,100) Ø6.35(1/4) Ø12.7(1/2) Ø9.52(3/8)
< 16.0 (54,600) Ø9.52(3/8) Ø15.88(5/8) Ø12.7(1/2)
< 22.4 (76,400) Ø9.52(3/8) Ø19.05(3/4) Ø15.88(5/8)
< 33 (112,600) Ø9.52(3/8) Ø22.2(7/8) Ø19.05(3/4)
< 47 (160,400) Ø12.7(1/2) Ø28.58(1-1/8) Ø22.2(7/8)
< 71 (242,300) Ø15.88(5/8) Ø28.58(1-1/8) Ø28.58(1-1/8)
< 104 (354,900) Ø19.05(3/4) Ø34.9(1-3/8) Ø28.58(1-1/8)
104 (354,900) ≤ Ø19.05(3/4) Ø41.3(1-5/8) Ø28.58(1 -1/8)
Liquid pipe
[mm(inch)]
Low pressure High pressure
Gas pipe [mm(inch)]
Outdoor unit ~ the farthest indoor unit Equivalent pipe length
A+B+C3+D+K ≤ 150m(492ft)(200m(656ft))(*) A+B+C3+D+K ≤ 175m(574ft)(225m(738ft))(*)
HR Unit ~ neighboring HR Unit
D≤ 10m(33ft)
First indoor branch ~ the farthest indoor unit
B+C3+D+k ≤ 90m(295ft)(*)
First outdoor branch ~ the farthest outdoor unit
E+F3 ≤ 10m(33ft)
Difference in height (outdoor unit ÷ indoor unit)
H ≤ 100m(328ft)
Difference in height (indoor ~ indoor unit)
H ≤ 15m(49ft)
Piping length from each indoor unit to the closest HR Unit
a,b,c,d,e,f,g, i, j, k ≤ 40m(131ft)
E1 ~
D10
C3 ~ C4
B1 ~
D10
E1 ~
A3
H
h
g, I, j, k
CAUTION
• Assume equivalent pipe
length of Y branch to be
0.5m(1.6ft), calculation
purpose.
CAUTION:
• Should not be exceed
10m(33ft) between
neighboring HR unit.
• Serial connection of
HR units : Capacity
sum of indoor units ≤
160kBtu/hr.
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