Mitsubishi Electric PUHY-HP120TNU-A, Service Handbook, Page: 56 / 324

[2-10 Restrictions on Refrigerant Pipes ]
HWE18240_GB chapter 2 -
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2 Restrictions
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)
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 piping length to the farthest indoor unit 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 piping length to the farthest indoor unit exceeds 40 m [131 ft].
ø28.58 [1-1/8"]
144 model ø12.7 [1/2"] ø28.58 [1-1/8"]
192 model ø15.88 [5/8"] ø28.58 [1-1/8"]
240 model ø15.88 [5/8"] ø28.58 [1-1/8"]
model Pipe diameter (mm) [inch]
05 - 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"]