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English
<Example of connection>
Outdoor unit
side
Indoor unit
side
Branch Selector
unit
(1)
(2)
(1) Piping from outdoor units to Branch Selector units, and between Branch Selector units
Suction gas pipe
High/low pressure gas pipe
Liquid pipe
(3 lines):
3 pipes
(2) Piping from Branch Selector units to the indoor units, and from refrigerant branch kits to the cooling-only indoor units
(*2)
(2 lines):
2 pipes
(Suction) gas pipe
Liquid pipe
(*2) The 2-line gas pipe that is branched from the 3-line pipe and goes to the cooling-only indoor units should be connected to the suction gas pipe.
(*3) Cooling-only units should make up ≤50% of the total capacity of indoor units.
Maximum
allowable
length
From outdoor unit (*4)
to indoor unit
Actual piping length
Actual piping length from the outdoor unit (*4) to the indoor unit: ≤540 ft. (165 m)
(Example) 4
: a+e+h+j≤540 ft. (165 m),
7
: a+b+c+d+m+n+p≤540 ft. (165 m),
11
: a+b+r+u+w≤540 ft. (165 m),
12
: a+b+c+d+q≤540 ft. (165 m)
Equivalent length
Equivalent piping length from the outdoor unit (*4) to the indoor unit: ≤623 ft.
(190 m) (*6)
(Calculate the equivalent piping length for the REFNET joint as 1.6 ft. (0.5 m),
REFNET header as 3.3 ft. (1 m), BS4
•
6Q54T
*
as 19 ft. (6 m), BS8 to 12Q54T
*
as
33 ft. (10 m), BSQ36
•
60T
*
as 13 ft. (4 m), and BSQ96T
*
as 19 ft. (6 m).)
For the equivalent length of BSF-Q54T
*
, refer to the table below based on the total
capacity of the indoor units to be connected downstream.
Also add 14 ft. (4.3 m) to the below length when calculating an equivalent length to
each indoor unit connected to BSF-Q54T
*
.
Total capacity of the indoor
units to be connected down-
stream
Equivalent length
BSF4Q54T
*
BSF6Q54T
*
BSF8Q54T
*
< 54
1 ft. (0.4 m)
1 ft. (0.4 m)
1 ft. (0.4 m)
54 ≤ × < 72
1 ft. (0.4 m)
1 ft. (0.4 m)
1 ft. (0.4 m)
72 ≤ × < 111
2 ft. (0.7 m)
2 ft. (0.7 m)
2 ft. (0.7 m)
111 ≤ × < 162
5 ft. (1.6 m)
7 ft. (2.2 m)
7 ft. (2.2 m)
162 ≤ × < 230
7 ft. (2.2 m)
11 ft. (3.4 m)
11 ft. (3.4 m)
230 ≤ × ≤ 290
14 ft. (4.3 m)
19 ft. (5.8 m)
19 ft. (5.8 m)
Total extension
Total actual piping length from the outdoor unit (*4) to all indoor units: ≤1640 ft.
(500 m)
From first outdoor unit
multi connection pip-
ing kit to outdoor unit
(in a multi system)
Actual piping length
Equivalent length
Actual piping length from the first outdoor unit multi connection piping kit to the
outdoor unit: ≤33 ft. (10 m)
Equivalent piping length from the first outdoor unit multi connection piping kit to the
outdoor unit: ≤43 ft. (13 m)
Outdoor unit
D
A
A≤33 ft. (10 m) (equivalent length≤43 ft. (13 m))
D≤33 ft. (10 m) (equivalent length≤43 ft. (13 m))
Allowable
height differ-
ence
From outdoor unit to
indoor unit
Height difference
Height difference between outdoor unit and indoor unit (H1): ≤164 ft. (50 m) (if
outdoor unit is lower than indoor unit, ≤130 ft. (40 m)) (*7)
From indoor unit to
indoor unit
Height difference
From outdoor unit to
outdoor unit
Height difference
Height difference between outdoor units (H3): ≤16 ft. (5 m)
Actual piping length X Height difference between indoor units (H2)
X ≤ 540 ft. (165 m)
≤ 49 ft. (15 m)
X ≤ 390 ft. (120 m)
≤ 98 ft. (30 m)
01_EN_03_3P734038-2.indd 11
01_EN_03_3P734038-2.indd 11
2023/05/29 11:59:32
2023/05/29 11:59:32