– 14 –
27-EN 28-EN
■ Allowable length of refrigerant pipes and allowable height
difference between units
Lc
Lb
La
LA
L3
L4
L5
L6
f
g
h
i
j
abcde
(j)
L7
C
Follower unit
Outdoor unit
Height
difference
between
outdoor
units
H3 ≤ 5 m
Height
difference
between
outdoor
and indoor
units:
H1 ≤ 70 m
Height
difference
between
indoor
units:
H2 ≤ 40 m
First branching
section
Branching header
Indoor unit connecting
pipe
Indoor unit
Y-shaped branching
joint
Indoor unit
Y-shaped
branching joint
The longest piping length: L ≤ 235 m
The longest piping length from the fi rst branch: Li ≤ 90 m
Outdoor unit connection piping kit
(For linking of outdoor units)
The longest piping between outdoor units:
LO ≤ 25 m
Outdoor unit connecting pipes
Main piping L1
B
Follower
unit
A
Header
unit
◆ System restriction
Outdoor unit combination Up to 3 units
Total capacity of outdoor units Up to 60 HP
Indoor unit connection Up to 64 units
Total capacity of indoor units
(varies depending on the height difference between
indoor units.)
H2 ≤ 15m 135% of outdoor units’ capacity
15m < H2 105% of outdoor units’ capacity
◆ Cautions for installation
• Set the outdoor unit fi rst connected to the bridging pipe to the indoor units as the header unit.
• Install the outdoor units in order of their capacity codes: A (header unit) ≥ B ≥ C
• When connecting gas pipes to indoor units, use Y-shaped branching joints to keep pipes level.
• When piping to outdoor units using Outdoor unit connection piping kits, intersect the pipes to the outdoor unit
and those to indoor units at a right angle as shown in fi gure 1 on “6. Installation of the outdoor unit”. Do not
connect them as in fi gure 2 on “6. Installation of the outdoor unit”.
No. Piping parts Name Selection of pipe size Remarks
(5)
Branching section
Indoor unit
Indoor unit
connecting pipe
Connecting pipe size of indoor unit
Capacity rank Gas side
Liquid
side
007 to 012 type
15m or less real length Ø9.5 Ø6.4
Real length exceeds 15m Ø12.7 Ø6.4
015 to 018 type Ø12.7 Ø6.4
024 to 056 type Ø15.9 Ø9.5
072 to 096 type Ø22.2 Ø12.7
(6)
Branching section
Y-shaped
branching joint
Selection of branching section (Y-shaped branching joint)
Total capacity code of indoor units
Model name
Equivalent to HP
Equivalent to
capacity
Y-shape
branching joint
Below 6.4 Below 18.0 RBM-BY55E
6.4 to below 14.2 18.0 to below 40.0 RBM-BY105E
14.2 to below 25.2 40.0 to below 70.5 RBM-BY205E
25.2 or more 70.5 or more RBM-BY305E
(7)
Branching section Branching header
Selection of branching section (Branching header)
Total capacity code of indoor units
Model name
Equivalent to HP
Equivalent to
capacity
*2
Branching header
For 4
branches
Below 14.2
Below 40.0 RBM-HY1043E
14.2 to below 25.2
40.0 to below 70.5 RBM-HY2043E
For 8
branches
Below 14.2
Below 40.0 RBM-HY1083E
14.2 to below 25.2
40.0 to below 70.5 RBM-HY2083E
*2: Up to a total of 6.0 maximum equivalent to HP capacity codes is connectable to one line
after branching of header. When the total capacity codes of all outdoor units are 12 to below
26 (equivalent to HP) and you use a branching header for the first branching section, use
a RBM-HY2043E or RBM-HY2083E regardless of the total capacity codes of outdoor units
at downstream side. In addition, you cannot use a branching header for the first branching
section when the total capacity codes of all outdoor units are over 26 (equivalent to HP).
(8)
Branching section
Outdoor unit
connection piping
kit (For linking of
outdoor units)
Outdoor unit connection piping kit (For linking of outdoor units)
Total capacity code of outdoor units
*3
Model name
Equivalent to HP
Equivalent to
capacity
Outdoor unit
connection piping
kit (For linking of
outdoor units)
Below 26.0 Below 73.0 RBM-BT14E
26.0 or more Above 73.0 RBM-BT24E
*3: Downstream side when regarding the main piping as the start point
1117101401-3_EN.indd 141117101401-3_EN.indd 14 1/12/16 3:18 PM1/12/16 3:18 PM
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