4.3.1. Single type installation
Capacity [Btu/h class] 36,000 45,000 54,000
Pipe diameter <Liquid/Gas>
(Standard)
[mm (in.)]
9.52 (3/8) / 15.88 (5/8)
Max. piping length (L1)
[m]
75
*1
Min. piping length (L1)
[m]
5
Max. height difference (H1)
<Indoor unit to outdoor unit>
[m]
30
View (Example)
L1
H1
*1: For the standard pipe diameter.
4.3.2. Simultaneous operation multi type installation
CAUTION
Be certain to install indoor units in the same room because the combinations are for
simultaneous operation.
The lengths after branching should be equal if possible.
Twin type
Capacity [Btu/h class] 36,000 45,000 54,000
Indoor unit capacity
[Btu/h class]
18,000
+ 18,000
22,000
+ 22,000
24,000
+ 24,000
Main pipe diameter (L1)
<Liquid/Gas>
(Standard) [mm (in.)]
9.52 (3/8) / 15.88 (5/8)
Branch pipe diameter (L2, L3)
<Liquid/Gas>
[mm (in.)]
6.35 (1/4) /
12.70 (1/2)
9.52 (3/8) /
15.88 (5/8)
Max. piping length
(L1+L2+L3)
[m]
75
*1
Min. piping length
(L1+L2+L3)
[m]
5
Max. branch piping
length (L2, L3) [m]
20
Max. difference between branch lengths
(L2 to L3)
[m]
8
Max. height difference (H1)
<Indoor unit to outdoor unit>
[m]
30
Max. height difference (H2)
<Indoor unit to indoor unit>
[m]
0.5
View (Example)
L1L3
L2
H1
H2
*1: For the standard pipe diameter.
Triple type
Capacity [Btu/h class] 54,000
Indoor unit capacity
[Btu/h class]
18,000 + 18,000 + 18,000
Main pipe diameter (L1)
<Liquid/Gas>
(Standard)
[mm (in.)]
9.52 (3/8) / 15.88 (5/8)
Branch pipe diameter
(L2, L3, L4)
<Liquid/Gas> [mm (in.)]
6.35 (1/4) / 12.70 (1/2)
Max. piping length
(L1+L2+L3+L4)
[m]
75
*1
Min. piping length
(L1+L2+L3+L4)
[m]
5
Max. branch piping length
(L2, L3, L4) [m]
20
Max. difference between branch lengths
(L2 to L4) [m]
8
Max. height difference (H1)
<Indoor unit to outdoor unit>
[m]
30
Max. height difference (H2)
<Indoor unit to indoor unit>
[m]
0.5
View (Example)
L2
L3
L4 L1
H1
H2
*1: For the standard pipe diameter.
4.4. Connectable pipe diameter and max. piping length
The gures enclosed by a thick-lined frame indicate the standard pipe diameter and max.
piping length.
4.4.1. Single type installation
Capacity [Btu/h class]
36,000 / 45,000 / 54,000
Pipe diameter
[mm (in.)]
Liquid pipes 9.52 (3/8) 12.70 (1/2)
Gas pipes
15.88
(5/8)
19.05
(3/4)
15.88
(5/8)
19.05
(3/4)
Piping length
[m (m)]
Max. piping length < L1 >
*1
(Pre-charge length)
75
[30]
50
[30]
35
[15]
35
[15]
*1: Refer to “View” in the table of “4.3.1. Single type installation”.
4.4.2. Simultaneous operation multi type installation
Twin type
Capacity [Btu/h class]
36,000
Main piping
[mm (in.)]
Liquid pipes 9.52 (3/8) 12.70 (1/2)
Gas pipes
15.88
(5/8)
19.05
(3/4)
15.88
(5/8)
19.05
(3/4)
Branch piping
[mm (in.)]
Liquid pipes 6.35 (1/4)
Gas pipes 12.70 (1/2)
Piping length
[m (m)]
Max. piping length
<L1+L2+L3>
*1
(Pre-charge length)
75
[30]
50
[30]
35
[15]
35
[15]
Capacity [Btu/h class] 45,000 / 54,000
Main piping
[mm (in.)]
Liquid pipes 9.52 (3/8) 12.70 (1/2)
Gas pipes
15.88
(5/8)
19.05
(3/4)
15.88
(5/8)
19.05
(3/4)
Branch piping
[mm (in.)]
Liquid pipes 9.52 (3/8)
Gas pipes 15.88 (5/8)
Piping length
[m (m)]
Max. piping length
<L1+L2+L3>
*1
(Pre-charge length)
75
[30]
50
[30]
35
[15]
35
[15]
*1: Refer to “View” in Twin type of 4.3.2. Simultaneous operation multi type installation.
Triple type
Capacity [Btu/h class]
54,000
Main piping
[mm (in.)]
Liquid pipes 9.52 (3/8) 12.70 (1/2)
Gas pipes
15.88
(5/8)
19.05
(3/4)
15.88
(5/8)
19.05
(3/4)
Branch piping
[mm (in.)]
Liquid pipes 6.35 (1/4)
Gas pipes 12.70 (1/2)
Piping length
[m (m)]
Max. piping length
<L1+L2+L3+L4>
*1
(Pre-charge length)
75
[30]
50
[30]
35
[15]
35
[15]
*1: Refer to “View” in Triple type of 4.3.2. Simultaneous operation multi type installation.
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