21
Cooling Unit
Filter-Dryer
*Sight Glass
U-Trap
Liquid Loop
*Solenoid Valve
Oil Trap
Filter-Dryer
*Solenoid Valve
*Sight Glass
Cooling Unit
(At Each 10 Meters)
Oil Trap
Liquid Loop
Condensing Unit
REFRIGERANT PIPING
Refrigerant Piping
Selection of piping thickness
Depending on the change of the design pressure, the piping thickness and the material should also be
changed.
Unit: mm
Copper pipe
diameter
Existing refrigerant
New refrigerant
R-22
R410A
Thickness Copper pipe material Thickness Copper pipe material
Ø9.53
0.8
O Material
0.8
O Material
Ø12.7
0.9
O Material
1.0
O Material
Ø15.88
1.1
O Material
1.2
O Material
Ø19.05
1.1
O Material
1.4
O Material
Ø22.2
1.2
O Material
1.0
1/2H Material
Ø25.4
1.2
O Material
1.0
1/2H Material
Ø28.6
1.3
O Material
1.0
1/2H Material
Ø34.9
1.4
O Material
1.1
1/2H Material
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.
Unit: mm
Field Piping Arrangement
*
: Field-Supplied
: Liquid Refrigerant Pipe
: Gas Refrigerant Pipe
A: Condensing Unit Below B: Condensing Unit Above
Fig. 11. Field Piping Arrangement
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.
Copper pipe
diameter
Flare nut size B
R-22
R410A
Ø9.53
22
22
Ø12.7
24
26
Ø15.88
27
29
Ø19.05
36
36
Flare nut size B (mm)
Summary of Contents for RAS-NP10CTS
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