Mitsubishi Electric City Multi CMB-P1016NU-G, Service Handbook

Page: 73 / 349

- 64 -
[
II
Restrictions ]
(3) Size of the pipe that fits the sub BC controller ports
P72 and 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 P72 or P96 models of indoor units (or when the total capacity of indoor units exceeds P55), use a junc-
tion pipe kit (model name: CMY-R160J) and merge the two nozzles.
3) To connect multiple indoor units to a port (or to a junction pipe)
ΠMaximum total capacity of connected indoor units: P54 or below (in a system with a junction pipe: P96 or below)
ΠMaximum number of connectable indoor units: 3 units
ΠRefrigerant pipe selection (size of the pipes in sections A and B in the figure above): Select the proper size pipes
based on the total capacity of the downstream indoor units, using the table below as a reference.
Unit: mm [in]
Total capacity of indoor units Liquid pipe Gas pipe
P54 or below
ø9.52 [3/8"]
ø15.88 [5/8"]
P55-P72 ø19.05 [3/4"]
P73-P96 ø22.2 [7/8"]
*1
*1. Use the pipe that is supplied.
Unit: mm [in]
Operation Pipe sections
High-pressure side
(gas)
Low-pressure side
(gas)
Liquid pipe side
Total capacity of the
indoor units that are
connected to the BC
controller in question
On the BC controller
side P72 model or below ø15.88 [5/8"]
(Brazed connection)
ø19.05 [3/4"]
(Brazed connection)
ø9.52 [3/8"]
(Brazed connection)
P73-P108 models
ø19.05 [3/4"]
(Brazed connection)
ø22.2 [7/8"]
(Brazed connection)
P109 model or above ø28.58 [1-1/8"]
(Brazed connection)
ø12.7 [1/2"]
(Brazed connection)
Connection: brazed connection
Main BC controller
Sub BC controller
A B
*1
Reducer
(Standard
supplied parts)
Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit
P18 model or below P24-P54 models P72-P96 models
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.)
*2
Junction pipe kit
(Model name:
CMY-R160-J)
(Optional accessory)
Branch joint (Model name:CMY-Y102S-G)
(Optional
accessory
for use with the Y series
of City Multi)