Restrictions On Refrigerant Pipe Size - Mitsubishi Electric R410A Service Handbook

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