Mitsubishi Electric PURY-HP144, Service Handbook

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[2-10 Restrictions on Refrigerant Pipes ]
40
- chapter 2 HWE18220_GB
2 Restrictions
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.
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
(1) Size of the pipe that fits the standard 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"]
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
Cutting point : ø9.52 (Liquid side) or ø15.88 (Gas side)
(Indoor unit model : bigger than P50)
Cutting point : ø6.35 (Liquid side) or ø12.7 (Gas side)
(Indoor unit model : P50 or smaller)
Cut the piping at the cutting point
Have pipe expansion of indoor unit connecting port
Field pipe
Note:
Remove burr after cutting the piping to prevent entering the piping.
Check that there is no crack at the pipe expansion part.
A
B
C
D
E
F
Ⓑ
Ⓒ
Ⓓ
Ⓔ
Ⓕ Ⓐ
Ⓐ
Ⓕ Ⓐ
50
20
226[8-29/32"]
Supplied with a thermal
insulation cover
Liquid pipe side: 9.52[3/8”]ID
Gas pipe side: 19.05[3/4”]ID
Liquid pipe side: 9.52[3/8”]
(Brazed connection)
Gas pipe side: 15.88[5/8”]
(Brazed connection)