Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 81

[ II Restrictions ]
(2) Size of the pipe that fits the main BC controller ports
P72 - P336 models
To heat
source unit
*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
Heat source unit side
*1. When the piping length exceeds 65 meters [213 ft], use ø28.58 [1-1/8"] pipes for the section of the piping that ex-
ceeds 65 meters.
HWE15150
Connection: Brazed connection
BC controller (main)
(Model name:
CMY-R160C-J)
(Optional accessory)
Indoor Indoor
Model
P72
P96
P120
P144
P168
P192
P216
P240
P288
P312
P336
Indoor unit side
Twinning kit (Model name:CMY-Y102SS-G2)
A
*2
Junction pipe kit
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.)
Liquid pipe
ø9.52 [3/8"]
ø9.52 [3/8"]
ø9.52 [3/8"]
High pressure side (Liquid)
ø15.88 [5/8"]
(Brazed connection)
ø19.05 [3/4"]
(Brazed connection)s
ø22.2 [7/8"]
(Brazed connection)
*1
ø22.2 [7/8"]
(Brazed connection)
ø28.58 [1-1/8"]
(Brazed connection)
ø9.52 [3/8"]
(Flare connection)
- 72 -
(Optional accessory)
B
Indoor Indoor
Unit : mm [inch]
Gas pipe
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2 [7/8"]
Unit : mm [inch]
Pipe sections
Low-pressure side (Gas)
ø19.05 [3/4"]
(Brazed connection)
ø22.2 [7/8"]
(Brazed connection)
ø28.58 [1-1/8"]
(Brazed connection)
ø34.93 [1-3/8"]
(Brazed connection)
ø41.28 [1-5/8"]
(Brazed connection)
ø15.88 [5/8"]
(Flare connection)
GB