Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 82

[ II Restrictions ]
(3) Size of the pipe that fits the sub BC controller ports
To Main BC controller
*1
Reducer
(Standard supplied parts)
Indoor
P18 model or below P24-P54 models P72 or P96 model
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 units between the P72 and P96 models of indoor units (or when the total capacity of indoor units is P31
or above), use a junction pipe kit and merge the two nozzles.
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
Twinning kit: Use CMY-Y102SS-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
Operation
On the BC controller
side
Select the proper size pipes for the main unit based on the total capacity of the indoor units that are connected to both sub
BC controllers. Select the proper size pipes for the sub controller side based on the total capacity of the indoor units that are
connected to the sub controller.
HWE15150
Connection: Brazed connection
*2
Junction pipe kit
BC controller (sub)
(Model name:
CMY-R160C-J)
(Optional accessory)
Indoor Indoor
Liquid pipe
ø9.52 [3/8"]
ø9.52 [3/8"]
ø9.52 [3/8"]
Total capacity of the in-
door units that are con- High-pressure side
nected to the BC
controller
P72 model or below
(Brazed connection)
P73 - P108
(Brazed connection)
P109 - P126
P127 - P144
(Brazed connection)
P145 - P168
- 73 -
Twinning kit (Model name:CMY-Y102SS-G2)
(Optional accessory)
A B
Indoor Indoor
3*
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.)
Pipe sections
Low-pressure side
(liquid) (gas)
ø15.88 [5/8"] ø19.05 [3/4"]
(Brazed connection)
ø22.2 [7/8"]
ø19.05 [3/4"]
(Brazed connection)
ø28.58 [1-1/8"]
ø22.2 [7/8"]
(Brazed connection)
Indoor
Unit : mm [inch]
Gas pipe
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2 [7/8"]
Unit : mm [inch]
Liquid pipe side
ø9.52 [3/8"]
(Brazed connection)
ø12.7 [1/2"]
(Brazed connection)
ø15.88 [5/8"]
(Brazed connection)
GB