34 Outdoor Unit
Refrigerant piping installation
Refrigerant piping system
Example : 3 outdoor units, 4 HR units and 11 indoor units
Outdoor unit
Y branch
HR unit
Indoor unit
Y branch
WARNING
* : Serial connection of HR units : Capacity sum of indoor units ≤ 160kBtu/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, equivalent length : max 13m (for 16HP or more)
A1
C1
D1
D2
D3
D4
D6
D7
D8
D9
D10
E1
E2
A
F3
C1
B
C2
C3
*
B1
B2
A2
A3
a
b
c
d
e
g
j
k
f
i
H
h
"a"
"b"
F2
F1
D
E
C2
D5
C4
C3
Main
Sub 1
Sub 2
■ Case1 ("a")
: Maximum height is 15 m if you install with Y branch.
■ Case2 ("b")
: Height is zero(0) m in HR unit serial connector.
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