Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 15

[ I Read Before Servicing ]
4. Thickness and refrigerant type indicated on the piping materials
Ask the pipe manufacturer for the symbols indicated on the piping material for new refrigerant.
5. Flare processing (O-material (Annealed) only)
The flare processing dimensions for the pipes that are used in the R410A system are larger than those in the R22 system.
Flare processing dimensions (mm[in])
Pipe size (mm[in])
ø6.35 [1/4"]
ø9.52 [3/8"]
ø12.7 [1/2"]
ø15.88 [5/8"]
ø19.05 [3/4"]
If a clutch-type flare tool is used to flare the pipes in the system using R410A, the length of the pipes must be between 1.0
and 1.5 mm. For margin adjustment, a copper pipe gauge is necessary.
6. Flare nut
Type-2 flare nuts instead of type-1 are used to increase the strength. The size of some of the flare nuts have also been
changed.
Flare nut dimensions (mm[in])
Pipe size (mm[in])
ø6.35 [1/4"]
ø9.52 [3/8"]
ø12.7 [1/2"]
ø15.88 [5/8"]
ø19.05 [3/4"]
The figures in the radial thickness column are based on the Japanese standards and provided only as a reference. Use
pipes that meet the local standards.
A dimension (mm[in])
R410A
9.1 [0.358] 9.0
13.2 [0.520] 13.0
16.6 [0.654] 16.2
19.7 [0.776] 19.4
24.0 [0.945] 23.3
B dimension (mm[in])
R410A
17.0 [0.669] 17.0
22.0 [0.866] 22.0
26.0 [1.024] 24.0
29.0 [1.142] 27.0
36.0 [1.417] 36.0
- 6 -
R22
[0.354]
[0.512]
[0.638]
[0.764]
[0.917]
R22
[0.669]
[0.866]
[0.945]
[1.063]
[1.417]
Dimension B