6. SYSTEM DESIGN
PIPING DESIGN2.
IMPORTANT ITEMS WHEN USING REFRIGERANT R410A2-1.
R410A operates at higher pressure and has less solubility with mineral oil than
traditional R22 refrigerant. Therefore, the lubricant and a part of pipe material are different.
Some special tools are necessary.
REFRIGERANT PIPING MATERIAL AND WALL THICKNESS
It is necessary to use seamless copper tubes for refrigerant use.
Thickness of tubes are shown in table below.
Endurance pressure of the pipe must be 4.2 MPa.
Nominal Diameter (in) 1/4" 3/8" 1/2" 5/8" 3/4"
Outside Diameter (mm) 6.35 9.52 12.70 15.88 19.05
Material JIS H3300 C1220T-O or equivalent *1
Wall Thickness *2 (mm) 0.8 0.8 0.8 1.0 1.2
owabe tensie stress
2
)
*2: Endurance pressure of the pipe must be 4.2 MPa.
Please select the pipe size in accordance with local rules.
LUBRICANT
Refrigerant R410A (Mixed refrigerant)
Lubricant Synthetic oil
TOOLS
R410A work requires a number of special tools. Since the tools (marked *4 below) for R22
work cannot be used for R410A, prepare them beforehand.
Tool name Process and application
Pipe cutter Pipe cutting
Refrigerant piping work
Flaring tool *4 Pipe aring wor
Torque wrench *4 Flare nut connection
Expander Expansion at pipe connection
Pipe bender Pipe bending work
Nitrogen gas Pipe interior oxidation prevention
Air tightness test
Welder Pipe brazing
Gauge manifold *4
Vacuum evacuation and refrigerant
charging Operation check
Air tightness test ~
Refrigerant additional charging
Charging hose *4
Vacuum pump (with adaptor) *4 Vacuum drying
Electronic scale for refrigerant charging
Refrigerant additional charging
Gas leak tester *4 Gas leakage test
*4: Please refer to the service manual for details.
- (06 - 11) -
SYSTEM
DESIGN
SYSTEM
DESIGN
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