Mitsubishi Electric HP120TNU-A Service Handbook page 73

[2-10 Restrictions on Refrigerant Pipes ]
(3) Size of the pipe that fits the sub BC controller ports
To Main BC controller
Indoor
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.
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)
A F
2) To connect P72 - P96 models of indoor units (or when the total capacity of indoor units exceeds P55), use a junction
pipe kit and merge the two nozzles.
226[8-29/32"]
Liquid pipe side: 9.52[3/8"]ID
Gas pipe side: 19.05[3/4"]ID
Supplied with a thermal
insulation cover
44
- chapter 2
Connection: Brazed connection
BC controller (sub)
Indoor Indoor
P05-P54 models P72-P96 models
Be sure to have pipe expansion of indoor unit connecting port by
A
cutting the piping at the cutting point which depends on the indoor unit capacity.
Indoor unit connecting port
A
Cutting point : ø9.52 (Liquid side) or ø15.88 (Gas side)
B
(Indoor unit model : bigger than P50)
B C Cutting point : ø6.35 (Liquid side) or ø12.7 (Gas side)
C
(Indoor unit model : P50 or smaller)
Cut the piping at the cutting point
D
Have pipe expansion of indoor unit connecting port
E
Field pipe
F
D
Note:
Remove burr after cutting the piping to prevent entering the piping.
Check that there is no crack at the pipe expansion part.
E
A F
Liquid pipe side: 9.52[3/8"]
(Brazed connection)
Gas pipe side: 15.88[5/8"]
(Brazed connection)
Branch joint (Model name:CMY-Y102S-G2)
(Optional accessory)
Junction pipe kit
(Model name:
CMY-R160-J1)
(Optional accessory)
A B
Indoor Indoor
Maximum of 3 units per port
Total capacity of P54 or below (Note 1)
Indoor
HWE18220_GB