En-2
SYSTEM CONFIGURATION
41
Piping limitation and Pipe size
41 11
Outdoor
Unit
Branch Box
Separation Tube
(Primary)
(Secondary2)
(Secondary1)
Branch Box
Branch Box
Indoor
Unit1
Indoor
Unit2
Indoor
Unit3
Indoor
Unit4
Indoor
Unit5
Indoor
Unit6
Indoor
Unit7
Indoor
Unit8
f
g
h
d
H3
H4
e
i
j
k
l
m
H1
H2
b
a
c
Pipe limitation
Limitation
m
Diagram
Allowable pipe length
(actual pipe length)
Maximum total equivalent pipe length
115 or less
Total
Between outdoor unit and the farthest indoor unit
70 or less
a + b + c + m
Between outdoor unit and branch boxes
55 or less
a + b + c + d + e
Between branch box and indoor unit
Total
60 or less
f + g + h + i + j + k + l + m
Each unit
Between 3-15
f, g, h, i, j, k, l, m
Between outdoor unit and the first separation tube
5 or more
a
Between outdoor unit and branch box (when there is no separation tube)
5 or more
a+d
Allowable
height
difference
Between outdoor unit and indoor unit
30 or less
H1
Between outdoor unit and branch box
30 or less
H2
Between branch box and branch box
15 or less
H3
Between indoor unit and indoor unit
15 or less
H4
Pipe size selection
Diagram
Condition
(Model code of indoor unit)
Gas pipe
(mm (in1))
Liquid pipe
(mm (in1))
Between outdoor unit and first separation tube
a
―
Φ15.88 (5/8)
Φ9.52 (3/8)
Between first separation tube and second
separation tube
b
―
Φ15.88 (5/8)
Φ9.52 (3/8)
Between separation tube and branch box
c, d, e
―
Φ15.88 (5/8)
Φ9.52 (3/8)
Between branch box and indoor unit
f, g, h, i,
j, k, l, m
7, 9, 12
Φ9.52 (3/8)
Φ6.35 (1/4)
14, 18
Φ12.70 (1/2)
Φ6.35 (1/4)
24
Φ15.88 (5/8)
Φ6.35 (1/4)
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15/11/2555 11:17:58
