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4. Installing the refrigerant piping
4.2.2. Connection with Branch box (Fig. 4-2)
A Outdoor unit
B Branch box
C Indoor unit
c1
c2
E
D
b1
B
H
a1
h1
a2
a3
a4
a5
C
C
C
C
h3
Total piping length
Farthest piping length (L) *1
Permissible
Piping length between outdoor unit and branch boxes
length
(one-way)
Farthest branch box from the first joint
Farthest piping length after branch box (R)
Total piping length between branch boxes and indoor units
In indoor/outdoor section (H) *2
Permissible
height difference
In branch box / indoor unit section
(one-way)
In each branch unit (h2)
In each indoor unit (h3)
Number of bends
*1 The piping specification table does not provide a minimum line set length. However, indoor units with connected piping length less than 16 ft. (5 m) could produce intermit-
tent noise during normal system operation in very quiet environments. Please be aware of this important information when installing and locating the indoor unit within the
conditioned space.
*2 Branch box should be placed within the level between the outdoor unit and indoor units.
Caution:
Always keep to the limit on the total amount of refrigerant. Exceeding the limit on the total amount of refrigerant when charging will lead to malfunction.
Refer to 4.7 for the calculation of the amount of refrigerant.
D The first joint
E The second joint
b3
b2
B
h2
a11 a12
a6
a7
a8
a9
a10
C
C
C
C
C
Fig. 4-2
L
B
R
C
c1 + c2 + b1 + b2 + b3 + a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 + a12
≤ 240 m [787 ft]
c1 + c2 + b3 + a12 ≤ 80 m [262 ft]
c1 + c2 + b1 + b2 + b3 ≤ 95 m [311 ft]
c2 + b3 ≤ 30 m [98 ft]
a12 ≤ 25 m [82 ft]
a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8 + a9 + a10 + a11 + a12 ≤ 145 m [475 ft]
H ≤ 50 m [164 ft] (In the case of outdoor unit is set higher than indoor unit)
H ≤ 40 m [131 ft] (In the case of outdoor unit is set lower than indoor unit)
h1 + h2 ≤ 15 m [49 ft]
h2 ≤ 15 m [49 ft]
h3 ≤ 12 m [39 ft]
| c1 + b1 + a1 |, | c1 + b1 + a2 |, | c1 + b1 + a3 |, | c1 + b1 + a4 |, | c1 + b1 + a5 |, | c1 + c2 +
b2 + a6|, |c1 + c2 + b2 + a7|, |c1 + c2 + b2 + a8|, |c1 + c2 + b2 + a9|, |c1 + c2 + b2 + a10|,
|c1 + c2 + b3 + a11|, |c1 + c2 + b3 + a12| ≤ 23
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