A. Connection with only VRF indoor units
Fig. 4-2. Permitted refrigerant piping lengths and level differences (A)
Table 4-10. Piping and Component Names
M
L
g2
g1
g3
G1
L1
L5
L2
A
L9
L6
C
n
II
p
o
B
L3
L4
I
m
j
l
L8
L7
N3
N9
N10
N11
c
First branch
D
k
b
a
N2
N1
MS
MS
MS
MS
N4
N12
N13
h
N8
MS
e
f
g
i
N5
N6
N7
Header
d
OUTDOOR UNITS
(One or more outdoor units)
(Slave 1) (Master)
(Slave 2)
MS box
Header branch
Indoor unit
LEGEND
Branch joint
Y#\#***
Maximum piping length from the first branch joint to
$#_
Maximum piping length from MS Box to
#+
Y#\**$$
Maximum level difference between Indoor unit
#
NAME
Outdoor unit connection pipe
Outdoor unit branch joint
Main pipe
Indoor unit main pipe
Branch joint between main pipe and MS box
Branch joint between MS box and indoor unit
Indoor unit auxiliary pipe
VRF indoor unit
Designation
g1, g2, g3, G1
L, M
L1
L2 to L9
A to D
I,II
a to p
N1 to N13
Table 4-11. Summary of permitted refrigerant piping lengths and level differences
Permitted values
{`
+_
+
Piping in Fig. 4-2
\ _ #
Piping lengths
Level
dif
ferences
Total piping length
1
Piping between farthest indoor unit and first branch joint
3
Piping between farthest indoor
unit and outdoor unit or the last
multi-outdoor piping branch
2
Actual length
Equivalent length
Outdoor unit is above
4
Outdoor unit is below
5
Piping between MS box to downstream indoor unit
Piping between outdoor unit and outdoor branch joint
Largest level difference
between indoor unit and
outdoor unit
Largest level difference between indoor units
L1 + L2 + L4 + f + i
L2 + L4 + f + i
f + i
11
