EQUATION EQ3-9K - Pipe Materials; Piping Materials;Radial Thickness; Flare Machining; Flare Nut

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Read before installation
Pipe Materials
Types of Copper Pipes(Reference )
Maximum Operation Pressure Applicable Refrigerant
3,4 MPa R22, R407C
4,3 MPa R32
• Use pipes that meet the local standards..
Piping Materials/Radial Thickness
Use pipes made of phosphorus deoxidized copper.
Since the operation pressure of the units that use R32 is higher than that of the units for use with R22, use pipes with at least the radial
thickness specified in the chart below. (Pipes with a radial thickness of 0.65mm or less may not be used.)
Size(mm)
Size(inch)
Radial Thickness(mm)
Type
∅ 6.35
1/4"
0,8t
Type-O pipes
∅ 9.52
3/8"
0,8t
∅ 12.7
1/2"
0,8t
∅ 15.88
5/8"
1,0t
∅ 19.05
3/4"
1,0t
Type - 1/2H or H pipes
• Although it was possible to use type-O for pipes with a size of up to φ19.05(3/4") with conventional retngeranis ,use type-1/2H pipes for
units that use R32 .(Type-O pipes may be used if the pipe size is φ19.05 and the radial thickness is 1.2t)
• The table shows the standards in Japan. Using this table as a reference, choose pipes that meet the local standards.
Flare Machining (type-O and OL only)
The flare machining dimensions for units that use R32 is larger than those for units that use R22 in order to increase air tightness..
Flare Machining Dimension(mm):
External dimension
of pipes
Size
Dimension A
R32
R22
∅ 6.35
1/4"
9.1
9.0
∅ 9.52
3/8"
13.2
13.0
∅ 12.7
1/2"
16.6
16.2
∅ 15.88
5/8"
19.7
19.4
∅ 19.05
3/4"
24.0
23.3
If a clutch type flare tool is used to machine flares on units that use R32 , make the protruding part of the pipe between 1.0 and 1.S5mm.
Copper pipe gauge for adjusting the length of pipe protrusion is useful.
Flare Nut
Type-2 flare nuts instead of type-1 nuts are used to increase the strength. The size of some of the flare nuts have also been changed.
Flare nut dimension (mm)
External dimension
of pipes
Size
Dimension B
R32
R22
∅ 6.35
1/4"
17.0
17.0
∅ 9.52
3/8"
22.0
22.0
∅ 12.7
1/2"
26.0
24.0
∅ 15.88
5/8"
29.0
27.0
∅ 19.05
3/4"
36.0
36.0
• The table shows the standards in Japan. Using this table as a reference, choose pipes that meet the local standards..
Dimension A
Dimension B