Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 80

[ II Restrictions ]
1) To connect P06 - P18 models of indoor units use
the reducer that is supplied with the BC controller.
Liquid pipe side:3/8F
(Flare connection)
Gas pipe side:5/8F
(Flare connection)
Note) Use the flare nut that is supplied with the BC controller.
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
Twinning kit: Use CMY-Y102SS-G2 (optional accessory).
Refrigerant 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.
Total capacity of indoor units
P54 or below
P55 - P72
P73 - P96
HWE15150
70 [2-25/32"]
Liquid pipe side: 6.35[1/4"]ID
Gas pipe side: 12.7[1/2"]ID
2) To connect P72 - P96 models of indoor units (or when the
total capacity of indoor units exceeds P31), use a junction
pipe kit and merge the two nozzles.
Liquid pipe side:3/8F
(Flare connection)
Gas pipe side:5/8F
(Flare connection)
Liquid pipe
ø9.52 [3/8"]
ø9.52 [3/8"]
ø9.52 [3/8"]
- 71 -
234 [9-7/32"]
Liquid pipe side: 9.52[3/8"]ID
Gas pipe side: 19.05[3/4"]ID(*1)
Supplied with a thermal insulation cover
Unit : mm [inch]
Gas pipe
ø15.88 [5/8"]
ø19.05 [3/4"]
ø22.2 [7/8"]
GB