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ENGLISH
Installation Manual 33
Refrigerant piping system
WARNING
* : Serial connection of HR units : Capacity sum of indoor units ≤ 192.4 kBtu/hr
• Refer to the HR unit PCB part for the valve group control setting.
• It is recommended that difference in pipe lengths between an HR unit and indoor units, for example
difference in length of a, b, c, and d, be minimized. The larger difference in pipe lengths, the more different
performance between indoor units.
•
Piping length from outdoor branch to outdoor unit ≤ 10m(33ft), equivalent length : max 13m(43ft) (for 14HP or more)
❊
If the large capacity indoor units (Over 5 HP; using over Ø15.88(5/8)/9.52(3/8) are installed, it should be
used the Valve Group setting
➲
Refrigerant pipe diameter from branch to branch (B,C)
➲
Total pipe length = A+B+C1+C2+C3+a+b+c+d+e+f+g+i+j+k+l+m+n ≤ 1,000m(3,280ft)
Longest pipe length * Equivalent pipe length
A+B+C3+k ≤ 150m(492ft)[200m**(656ft**)]
A+B+C3+k ≤ 175m(574ft)[225m**(738ft**)]
Longest pipe length after 1st branch
B+C3+k ≤ 40m(131ft)[90m**(295ft**)]
Difference in height(Outdoor Unit
↔
Indoor Unit)
H ≤ 110m(361ft)
Difference in height (Indoor Unit
↔
Indoor Unit)
h ≤ 15m(49ft)
Difference in height (Outdoor Unit
↔
Outdoor Unit)
h1 ≤ 5m(16ft)
Difference in height(HR Unit
↔
HR Unit)
a ≤ 15m(49ft) , b ≤ 5m(16ft)
L
l
H
h
h1
"a", "b"
• * :
Assume equivalent pipe length of Y branch to be 1.64ft, that of header to be 3.3ft, calculation purpose
• it is recommended that indoor unit is installed at lower position than the header.
• ** : Conditional application
Downward indoor unit total
capacity [kW(Btu/h)]
Liquid pipe
[mm(inch)]
Gas pipe [mm(inch)]
Low pressure High pressure
≤ 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)
< 33.6(114,700) Ø9.52(3/8) Ø22.2(7/8) Ø19.05(3/4)
< 50.4(229,000) Ø12.7(1/2) Ø28.58(1-1/8) Ø22.2(7/8)
< 67.2(229,400) Ø15.88(5/8) Ø28.58(1-1/8) Ø22.2(7/8)
< 72.8(210,600) Ø15.88(5/8) Ø34.9(1-3/8) Ø28.58(1-1/8)
< 100.8(344,000) Ø19.05(3/4) Ø34.9(1-3/8) Ø28.58(1-1/8)
< 173.6(592,500) Ø19.05(3/4) Ø41.3(1-5/8) Ø34.9(1-3/8)
< 184.8(630,700) Ø22.2(7/8) Ø44.5(1-3/4) Ø41.3(1-5/8)
< 224.0(764,400) Ø22.2(7/8) Ø53.98(2-1/8) Ø44.5(1-3/4)
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