Mitsubishi Electric HP120TNU-A Service Handbook page 71

[2-10 Restrictions on Refrigerant Pipes ]
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)
Ⓐ Ⓕ
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
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
Branch joint: Use CMY-Y102SS-G2, CMY-Y102LS-G2 (optional accessory).
(2) Size of the pipe that fits the main BC controller ports (A, B): Select the proper size pipes 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
42
- chapter 2
Be sure to have pipe expansion of indoor unit connecting port by
Ⓐ
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)
50
Cutting point : ø6.35 (Liquid side) or ø12.7 (Gas side)
C
20
(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
Note:
Ⓓ
Remove burr after cutting the piping to prevent entering the piping.
Check that there is no crack at the pipe expansion part.
Ⓔ
Ⓐ Ⓕ
Liquid pipe side: 9.52[3/8"]
(Brazed connection)
Gas pipe side: 15.88[5/8"]
(Brazed connection)
Liquid pipe
ø9.52 [3/8"]
ø9.52 [3/8"]
ø9.52 [3/8"]
Unit : mm [inch]
Gas pipe
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2 [7/8"]
HWE18220_GB