Mitsubishi Electric PURY-HP144, Service Handbook

Page: 74 / 398

[2-10 Restrictions on Refrigerant Pipes ]
HWE18220_GB chapter 2 -
45
2 Restrictions
3) To connect multiple indoor units to a port (or to a junction pipe)
Œ
Maximum total capacity of connected indoor units: P54 or below (in a system with a junction pipe: P96 or below)
Œ
Maximum number of connectable indoor units: 3 units
Œ
Branch joint: Use CMY-Y102SS-G2, CMY-Y102LS-G2 (optional accessory).
Œ
(3) Size of the pipe that fits the sub 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.
Unit : mm [inch]
Total capacity of indoor units Liquid pipe Gas pipe
P54 or below ø9.52 [3/8"] ø15.88 [5/8"]
P55 - P72 ø9.52 [3/8"] ø19.05 [3/4"]
P73 - P96 ø9.52 [3/8"] ø22.2 [7/8"]
Unit : mm [inch]
Operation Pipe sections
Total capacity of indoor
units connected to down-
stream BC controller
High-pressure side
(gas)
Low-pressure side
(gas)
Liquid pipe side
Main BC controller side
- P72
ø15.88 [5/8"]
(Brazed connection)
ø19.05 [3/4"]
(Brazed connection)
ø9.52 [3/8"]
(Brazed connection)
P73 - P108
ø19.05 [3/4"]
(Brazed connection)
ø22.2 [7/8"]
(Brazed connection)
P109 - P126
ø28.58 [1-1/8"]
(Brazed connection)
ø12.7 [1/2"]
(Brazed connection)
P127 - P144
ø22.2 [7/8"]
(Brazed connection)
P145 - P180
ø15.88 [5/8"]
(Brazed connection)
P181 - P234
ø28.58 [1-1/8"]
(Brazed connection)
P235 - P288
ø34.93 [1-3/8"]
(Brazed connection)
ø19.05 [3/4"]
(Brazed connection)
P289 - P360
ø41.28 [1-5/8"]
(Brazed connection)
P361 -
ø34.93 [1-3/8"]
(Brazed connection)