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REFRIGERANT PIPING
Selection of piping thickness
Depending on the change of the design pressure, the piping thickness and the material should also be
changed.
Copper pipe
diameter
Ø9.53
Ø12.7
Ø15.88
Ø19.05
Ø22.2
Ø25.4
Ø28.6
Ø34.9
Selection of the connection section
Depending on the change of the design pressure, the thickness (bending head, connecting pipe, etc.) of
the connection section should also be changed. Therefore, select suitable Flare nut size according to the
Copper pipe diameter listed in the following table. Pay attention to this.
Flare nut size B (mm)
Liquid Loop
*Solenoid Valve
Filter-Dryer
*Sight Glass
A: Condensing Unit Below
NOTES:
1. These piping arrangements should be performed for both of the refrigeration cycles of the
dual-circuited models.
2. Do not connect the dual circuited models with a single-circuited cooling unit.
21
Refrigerant Piping
Existing refrigerant
R-22
Thickness
Copper pipe material
0.8
O Material
0.9
O Material
1.1
O Material
1.1
O Material
1.2
O Material
1.2
O Material
1.3
O Material
1.4
O Material
Copper pipe
diameter
Field Piping Arrangement
Cooling Unit
U-Trap
Fig. 11. Field Piping Arrangement
Thickness
0.8
1.0
1.2
1.4
1.0
1.0
1.0
1.1
Flare nut size B
R-22
Ø9.53
22
Ø12.7
24
Ø15.88
27
Ø19.05
36
Liquid Loop
*Sight Glass
*Solenoid Valve
Filter-Dryer
B: Condensing Unit Above
Unit: mm
New refrigerant
R410A
Copper pipe material
O Material
O Material
O Material
O Material
1/2H Material
1/2H Material
1/2H Material
1/2H Material
Unit: mm
R410A
22
26
29
36
*
: Field-Supplied
: Liquid Refrigerant Pipe
: Gas Refrigerant Pipe
Condensing Unit
Oil Trap
(At Each 10 Meters)
Cooling Unit
Oil Trap
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