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Installation of Outside Unit
4. Refrigerant Piping System
4.1 System diagram
Example : 10 Indoor Units connected
Slave 2
A3
h2
D2
h4
H
D3
h1
• It is recommended that difference in length of the pipes connected to the indoor units (a~k) is minimized.
The large difference in pipe lengths, the more different performance between indoor units.
• *** Serial connection of HR units : Capacity sum of indoor units ≤ 230 kBtu/hr
If the large capacity indoor units (Over 5 HP; using overØ15.88/Ø9.52) are installed, it should be used the Valve
Group setting.
• HR unit is for Heat Recovery System only.
Slave 1
Master
A2
A1
F2
F1
F3
E
E2
E1
D1
a
h3
b
C1
C1
c
"a"
d
C2
D4
C2
e
D5
A
Aircooled / Watercooled VRF Unit
B C
Y Branch / Header / HR Unit
!! After Header,
HR unit or Branch pipe can not be used.
D
Indoor Units
E
Connection branch pipe between Outdoor/Outside units
A
Main pipe before 1st Branch
E,F
Branch pipe between Unit
B,C,D
Branch pipe between branch to branch
A
a,b,c,d,e,f,g,i,j,k
Indoor Unit connecting pipe
B1
In case of
= HR unit
C
"a"
Height if HR unit is installed with Y branch.
"b"
Height in serial connection of HR units.
B
B2
C3
D
C3
g
i
D7
D8
f
D6
5
Installation
***
"b"
C4
k
j
D9
D10
e.g farthest indoor unit
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