– 9 –
17-EN 18-EN
5. Be careful of the connecting arrangement of the header unit and follower units. Set the outdoor units in order of
capacity from the one with the largest capacity. (A (Header unit) ≥ B ≥ C)
• Be sure to use a header unit for the leading outdoor unit to be connected to the main pipe. (Figure 1 and 3)
• Be sure to use a T-shaped branch joint (RBM-BT14E/RBM-BT24E: separately purchased) to connect each
outdoor unit.
• Be careful of the direction of the Outdoor unit connection piping kit for the liquid side. (As shown in Figure 2, a
Outdoor unit connection piping kit cannot be attached so that the refrigerant of the main pipe flows directly into
the header unit.)
Liquid piping
▼ Figure 1
Main pipe
Header unit
A
Follower unit
B
Follower unit
C
To the indoor unit
GOOD
▼ Figure 2
Main pipe
Header unit
A
Follower unit
B
Follower unit
C
To the indoor unit
NO GOOD
NO GOOD
Gas piping
▼ Figure 3
Main pipe
Header unit
A
Follower unit
B
Follower unit
C
To the indoor unit
Extension valve
GOOD
[Inverse connection of a gas-side branch unit]
▼ Figure 4
Main pipe
Header unit
A
Follower unit
B
Follower unit
C
To the indoor unit
To gas-side branch unit
NO GOOD
• When attaching a Y-shaped branch unit for the gas side, attach it level with the ground (Be sure not to exceed
±15 degrees.). Regarding a T-shape branch joints for the liquid side, there is no restriction for its angle.
A
B
(Horizontal line) (Horizontal line)
(A arrow view) (B arrow view)
Within ±15 degrees
Within ±15
degrees
Do not connect
a branch unit
vertically.
At a level position
When drawing pipes downward
▼ Figure 5
L-shaped
pipe
Header unit
A
Follower unit
B
Follower unit
C
To gas-side branch
unit
To gas-side branch
unit
GOOD
[Vertical connection of branch units]
▼ Figure 6
To gas-side
branch unit
To gas-side
branch unit
NO GOOD
• Adding only one follower unit is possible. Install the additional unit so that its position is opposite to the header
unit. Use an extension valve for installation (See the fi gure above.).
Specify the pipe diameter in advance to allow for adding another unit.
1117101401-3_EN.indd 91117101401-3_EN.indd 9 1/12/16 3:18 PM1/12/16 3:18 PM
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