[2-10 Restrictions on Refrigerant Pipes ]
(2) Size of the pipe that fits the main BC controller ports
HP72 - HP192 models
To outdoor unit
(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
Indoor unit side
Connection: Brazed connection
BC controller (main)
Junction pipe kit
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.)
High pressure side (Liquid)
ø9.52 [3/8"] (Flare connection)
- 60 -
Unit : mm [inch]
Unit : mm [inch]
Low-pressure side (Gas)
ø15.88 [5/8"] (Flare connection)