Mitsubishi Electric R410A, Service Handbook

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[2-10 Restrictions on Refrigerant Pipes ]
- 46 - HWE14080 GB
2-10-2 Restrictions on Refrigerant Pipe Size
(1) Diameter of the refrigerant pipe between the outdoor unit and the first branch (outdoor unit pipe size)
(2) Size of the refrigerant pipe between the first branch and the indoor unit (indoor unit pipe size)
(3) Size of the refrigerant pipe between the branches for connection to indoor units
Outdoor unit set name
(total capacity) Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch]
72 model ø9.52 [3/8"] ø22.2 [7/8"]
96 model ø9.52 [3/8"]
*1
*1. Use ø12.7 [1/2"] pipes if the furthest piping length (OU from IU) exceeds 90 m [295 ft].
ø22.2 [7/8"]
120 model ø9.52 [3/8"]
*2
*2. Use ø12.7 [1/2"] pipes if the furthest piping length (OU from IU) exceeds 40 m [131 ft].
ø28.58 [1-1/8"]
144 model ø12.7 [1/2"] ø28.58 [1-1/8"]
168 model ø15.88 [5/8"] ø28.58 [1-1/8"]
192 model ø15.88 [5/8"] ø28.58 [1-1/8"]
216 model ø15.88 [5/8"] ø28.58 [1-1/8"]
240 model ø15.88 [5/8"] ø28.58 [1-1/8"]
264 - 312 model ø19.05 [3/4"] ø34.93 [1-3/8"]
336 - 360 model ø19.05 [3/4"] ø41.28 [1-5/8"]
model Pipe diameter (mm) [inch]
06 - 15 models Liquid pipe ø6.35 [1/4"]
Gas pipe ø12.7 [1/2"]
18 - 54 models Liquid pipe ø9.52 [3/8"]
Gas pipe ø15.88 [5/8"]
72 model Liquid pipe ø9.52 [3/8"]
Gas pipe ø19.05 [3/4"]
96 model Liquid pipe ø9.52 [3/8"]
Gas pipe ø22.2 [7/8"]
Total capacity of the
downstream units Liquid pipe size (mm) [inch] Gas pipe size (mm) [inch]
- 54 ø9.52 [3/8"] ø15.88 [5/8"]
P55 - P72 ø9.52 [3/8"] ø19.05 [3/4"]
P72 - P108 ø9.52 [3/8"] ø22.2 [7/8"]
P109 - P144 ø12.7 [1/2"] ø28.58 [1-1/8"]
P145 - P240 ø15.88 [5/8"] ø28.58 [1-1/8"]
P241 - P308 ø19.05 [3/4"] ø34.93 [1-3/8"]
P309 - ø19.05 [3/4"] ø41.28 [1-5/8"]