The size of the branch end connection on the BC controller is designed to fit P63-P140 type indoor units.
To connect other types of indoor units, perform the following procedures.
✻
1: To connect P20-P50 type indoor units, use the reducer that is supplied with the BC controller
✻
2: To connect P200 or P250 type indoor units (or when the total capacity of the indoor units exceeds P141),
use an optional junction pipe kit (Type: CMY-R160-J) and merge the 2 joints.
✻
3: To connect multiple indoor units to a branch joint (or to a junction pipe)
• Total capacity of connectable indoor units : P140 or below (P250 or below when a junction pipe is used)
• The number of connectable indoor units : 3 max.
• Selection of refrigerant piping (pipe size of the A and B in the figure above)
: Use the total capacity of the downstream indoor units to determine the proper pipe size, using the
table below as a reference.
(3) BC controller (sub) end connection piping size
Total capacity of the indoor units
P140 or below
ø
15.88
ø
9.52
P141~P200
ø
19.05
ø
9.52
P201~P250
(
❈
) With reducer
ø
22.2 (
❈
)
ø
9.52
Gas pipe
Liquid pipe
Main BC controller
✻
1
Reducer
(supplied)
✻
2
Junction pipe kit
(Type: CMY-R160-J)
(option)
Branch pipe (Type: CMY-Y102S-G)
(For CITY MULTI Y series, option)
Maximum of 3 units per branch joint.
Total capacity of P140 or less
(All units connected to the same
branch joint must be in the same mode.)
End connection:
brazed connection
Sub BC controller
Item
BC
controller
side
High-pressure side
(liquid side)
Low-pressure side
(gas side)
Piping sections
ø
19.05
(Brazed)
ø
15.88
(Brazed)
ø
22.2
(Brazed)
ø
19.05
(Brazed)
ø
28.58
(Brazed)
Liquid side
ø
9.52
(Brazed)
ø
12.7
(Brazed)
Total capacity of indoor units
connected to applicable BC controller
P200 type and below
P201-P300 types
P301 types and above
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
P50 type
or below
P63-P140
types
P200-P250
types
B
A
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