[2-10 Restrictions on Refrigerant Pipes ]
(3) Size of the pipe that fits the sub BC controller ports
To Main BC controller
(Standard supplied parts)
P18 model or below P24 - P54 models P72 - P96 models
The ports of the BC controller accommodates the pipes on P24 - P54 models of indoor units. To connect other types of indoor
units, follow the procedure below.
1) To connect P06 - P18 models of indoor units use the reducer that is supplied with the BC controller.
2) To connect the P72 through P96 models of indoor units (or when the total capacity of indoor units is P55 or above), use
an optional twinning pipe kit (Model: CMY-R160-J) to merge two ports before connecting them.
3) To connect multiple indoor units to a port (or to a junction pipe)
Maximum total capacity of connected indoor units: P54 or below (in a system with a junction pipe: P96 or below)
Maximum number of connectable indoor units: 3 units
Branch joint: Use CMY-Y102S-G2 (optional accessory).
Refrigerant pipe selection (size of the pipes in sections A and B in the figure above): Select the proper based on the total
capacity of the downstream indoor units, using the table below as a reference.
Total capacity of indoor units
P54 or below
P55 - P72
P73 - P96
On the BC controller
Connection: Brazed connection
Junction pipe kit
BC controller (sub)
Total capacity of the in-
door units that are con-
nected to the BC
P72 model or below
P73 - P108
P109 - P126
P127 - P144
P145 - P168
- 61 -
Branch joint (Model name:CMY-Y102S-G2)
Maximum of 3 units per port
Total capacity of P54 or below
(All units connected to the same port
must be in the same operating mode.)
Unit : mm [inch]
Unit : mm [inch]
Liquid pipe side