4.3.3 Selecting piping diameters
Fig. 4-1. Selecting piping diameters
o
n
N12
M
L
g2
g1
g3
G1
L1
L5
L2
A
L9
L6
C
E
B
L3
L4
I
m
j
l
L8
L7
N3
N9
N10
N11
c
OUTDOOR UNITS
(One or more outdoor units)
First branch
D
k
b
a
N2
N1
(Slave 1)
(Master)
(Slave 2)
MS
MS
MS
N13
h
N8
MS
d
e
f
g
i
N5
N6
N7
Header
N4
MS box
Header branch
Indoor unit
LEGEND
Branch joint
HT hydro module
Table 4-1. Piping and Component Names
NAME
Outdoor unit connection pipe
Outdoor unit branch joint
Main pipe
Indoor unit main pipe
Branch joint between main pipe and MS box or HT hydro module
Branch joint between MS box and indoor unit
Indoor unit auxiliary pipe
VRF indoor unit
High temperature hydro module (HT hydro module)
Designation
g1, g2, g3, G1
L, M
L1
L2 to L9
A to E
I
a to o
N1 to N11
N12 , N13
Notes:
1. When multiple mode selection (MS) boxes are used in a single system, they should be installed in parallel, never in series.
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3. Branches and others header branches cannot be installed downstream of the initial head branch.
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