Mitsubishi Electric PURY-WP-YJM-A Data Book page 197

3. Piping Design
3-1. R410A Piping material
3. Piping Design
Refrigerant pipe for CITY MULTI shall be made of phosphorus deoxidized copper, and has two types.
A. Type-O : Soft copper pipe (annealed copper pipe), can be easily bent with human's hand.
B. Type-1/2H pipe : Hard copper pipe (Straight pipe), is stronger than Type-O pipe of the same radial thickness.
The maximum operation pressure of R410A air conditioner is 4.30 MPa [623psi] . The refrigerant piping should ensure safety
under the maximum operation pressure. MITSUBISHI ELECTRIC recommends pipe size asT able 3-1, or you can follow the local
industrial standard. Pipes of radical thickness 0.7mm or less shall not be used.
Table 3-1. Copper pipe size and radial thickness for R410A CITY MULTI.
Size (mm) Size (inch) Radial thickness (mm)
ø6.35 ø1/4"
ø9.52 ø3/8"
ø12.7 ø1/2"
ø15.88 ø5/8"
ø19.05 ø3/4"
ø19.05 ø3/4"
ø22.2 ø7/8"
ø25.4 ø1"
ø28.58 ø1-1/8"
ø31.75 ø1-1/4"
ø34.93 ø1-3/8"
ø41.28 ø1-5/8"
* F or pipe sized ø19.05 (3/4") for R410A air conditioner, choice of pipe type is up to you.
* 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.
Flare
Due to the relative higher operation pressure of R410A compared to R22, the flare connection should follow dimensions
mentioned below so as to achieve enough air-tightness.
Flare pipe Pipe size
ø6.35 [1/4"]
ø9.52 [3/8"]
ø12.70 [1/2"]
ø15.88 [5/8"]
ø19.05 [3/4"]
Radial thickness (mil)
0.8 [32]
0.8 [32]
0.8 [32]
1.0 [40]
1.2 [48]
1.0 [40]
1.0 [40]
1.0 [40]
1.0 [40]
1.1 [44]
1.2 [48]
1.4 [56]
A (For R410A) (mm[in.])
9.1
13.2
16.6
19.7
24.0
SYSTEM DESIGN
Pipe type
Type-O
Type-O
Type-O
Type-O
Type-O
Type-1/2H or H
Type-1/2H or H
Type-1/2H or H
Type-1/2H or H
Type-1/2H or H
Type-1/2H or H
Type-1/2H or H
Flare nut Pipe size
ø6.35 [1/4"]
ø9.52 [3/8"]
ø12.70 [1/2"]
ø15.88 [5/8"]
B
ø19.05 [3/4"]
B (For R410A) (mm[in.])
17.0
22.0
26.0
29.0
36.0
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