24
∗3 Y-shape branching joint
∗4 4-branching header
∗4
8-branching header
∗5
T-shape branching joint
(For connecting outdoor unit)
Model name
RBM-BY53E
RBM-BY103E
RBM-BY203E
RBM-BY303E
RBM-HY1043E
RBM-HY2043E
RBM-HY1083E
RBM-HY2083E
RBM-BT13E
Total capacity codes of indoor unit ∗1, 2 External view
Below 6.4
6.4 or more and below 14.2
14.2 or more and below 25.2
25.2 or more
Below 14.2
Max. 4 branching
14.2 or more and below 25.2
Below 14.2
Max. 8 branching
14.2 or more and below 25.2
1 set of 3 types of T-shape joint pipes as described below.
The required quantity is arranged and they are combined at site.
Connecting pipe
Balancing pipe
Piping at liquid side
Piping at gas side
Corresponding dia
Ø9.5
Ø9.5 to Ø22.2
Ø15.9 to Ø41.3
Q’ty
1
1
1
5-8. External Dimensions of Branch Connectors
(Outline drawings are shown on the following pages.)
*
1 This code is determined by the capacity rank.
*
2 If the total of the capacity codes for the indoor units exceeds the capacity codes of the outdoor units, use the total
outdoor capacity code.
*
3 When using Y-shape branching joint for 1st branching, select according to capacity code of outdoor unit.
*
4 A maximum capacity code total of 6.0 can be connected to the system downstream of a header branch.
*
5 If an outdoor unit with a capacity code of at least 12 but less than 26 is connected on the first branch, use RBM-HY2043E
or RBM-HY2083E. Furthermore, an outdoor unit with a capacity code of 26 or higher cannot be used on the first branch.
5-9. Nitrogen Gas Blow Method (During Brazing)
• If nitrogen gas is not passed through the pipes during brazing, a film of oxidized material will form on the inner
surfaces of the pipes. The presence of a such a film in the system will adversely affect the operation of the
valves and compressor in the refrigerant system, and will prevent the system from operating normally.
• In order to prevent this from occurring, nitrogen gas is passed through the pipes while brazing is in progress.
This process of replacing the air in the pipes with nitrogen is called the “nitrogen gas blow.”
This is the basic method that is used for brazing work.
CAUTION
1. Nitrogen gas must be used. (Oxygen, carbon dioxide, and fluorocarbons cannot be used.)
2. Always be sure to use a pressure-reducing valve.
Piping at site
Reducing valve
Reducing
valve
Brazing
position
Copper pipe Ø6.4
Taping
Valve
Valve
Pressure
tight hose
Nitrogen
gas bomb
Nitrogen
gas bomb
Hose
Piping
Outside
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