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

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[
II
Restrictions ]
(2) Size of the pipe that fits the main 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 Low-pressure side
Heat source unit
side PQRY-P72TGMU-A ø15.88 [5/8"] (Brazed connection) ø19.05 [3/4"] (Brazed connection)
PQRY-P96TGMU-A ø19.05 [3/4"] (Brazed connection) ø22.2 [7/8"] (Brazed connection)
Indoor unit side ø9.52 [3/8"] (Flare connection) ø15.88 [5/8"] (Flare connection)
Main BC controller
To heat source unit
Connection: brazed connection
Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit Indoor unit
*1
Reducer
(Standard
supplied parts)
A B
P18 model or below P24-P54models P72-P96 models
*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)
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.)