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N Header Method
1 Outdoor Unit(Half size)
Example : 6 Indoor Units connected
: Outdoor Unit
: 1st branch
: Indoor Units
: Sealing
➲ Main pipe diameter (A)
PIPE
Liguid pipe
5HP
Gas pipe
Liguid pipe
6HP
Gas pipe
OVER
Liguid pipe
8HP
Gas pipe
➲ Total piping length = A+a+b+c+d+e+f ≤ 220m
Longest piping length
*L
A+f ≤ 120m
Longest pipeing length after 1st branch
l
f ≤ 30m
Difference in height(Outdoor Unit ↔ Indoor Unit)
H
H ≤ 50m ( 40m : Outdoor Unit is lower)***
Difference in height (Indoor Unit ↔ Indoor Unit)
h
h ≤ 15m
*: Must be satisfied both conditions
Caution : ***:Indoor Unit should be installed at lower position than the header.
1 Outdoor Unit
1 Outdoor Unit
(Half Size)
(Full Size)
Ø9.52(3/8 inch)
Ø19.05(3/4 inch)
-
Ø9.52(3/8 inch)
Ø22.2(7/8 inch)
Ø12.7(1/2 inch)
Ø28.58(1
1
/
inch)
8
**Equivalent piping length
A+f ≤ 140m
15m
Branch pipe can not be used after header
Refrigerant piping installation
L 120m
**: Assume equivalent pipe length of
Y branch to be 0.5m, that of head-
er to be 1m, calculation purpose.
Installation Manual 35
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