Mitsubishi Electric HP120TNU-A Service Handbook page 70

[2-10 Restrictions on Refrigerant Pipes ]
(2) Size of the pipe that fits the main BC controller ports
HP72 - HP336 models
Connection: Brazed connection
Low-pressure
main pipe
Outdoor
unit
High-pressure main pipe
Indoor unit Indoor unit
P05-P54 models P72-P96 models
P05-P54 models
*Note 1 Do not connect multiple indoor units to the same port when operating each of them in different mode
(cooling, heating, stop, and thermo-off).
The indoor units connected to the same port must be set to operate in the same mode. Set them in the
same group to make them run/stop in the same mode all together. For other options, enable the thermo
setting on the remote controller, or set the common thermostat (optional) to run/stop the units in the same
mode based on a representative temperature.
・ Restriction on installing the 2-Branch Joint Pipe CMY-R201/202/203/204/205S-G on the
high-pressure piping, low-pressure piping, and liquid piping.
To main BC controller
- Regarding the 2-Branch Joint Pipe on the high-pressure/low-pressure/liquid piping, A and B
must be installed horizontally, and C must be installed upward higher than the horizontal plane of A and B.
HWE18220_GB
BC controller (main)
Joint pipe kit
(Model name:
CMY-R160-J1)
(Optional accessory)
Indoor unit
To sub BC controller
C
A
B
To sub BC controller
High-pressure
gas pipe
BC
Low-pressure
controller
Branch joint pipe
gas pipe
(sub)
Model name: CMY-Y102S-G2)
(Optional accessory)
Liquid pipe
A B
Indoor unit Indoor unit
Maximum of 3 units per port
Total capacity of P54 or below*Note 1
Indoor unit
41
chapter 2 -