Piping Design; Important Items When Using Refrigerant (R410A) - Fujitsu AIRSTAGE J-IIIL Design & Technical Manual

2. Piping design

2-1. Important items when using refrigerant (R410A)

R410A operates at higher pressure and has less solubility with mineral oil than traditional R22 refrig-
erant. Therefore, R410A systems use a different lubricant and have different piping requirements.
• Refrigerant piping material and wall thickness
Only seamless copper tubes should be used for refrigerant piping. Thickness of tubes are shown
in table below.
Endurance pressure of the pipes must be 609 psi (4.2 MPa).
Nominal diameter
Outside diameter
Material
3
Wall thickness*
– *1: Allowable tensile stress ≥ 33 N/mm
– *2: Allowable tensile stress ≥ 61 N/mm
– *3: Endurance pressure of the pipes must be 609 psi (4.2 MPa).
Select the pipe size in accordance with the regional standard.
• Lubricant
Refrigerant
Lubricant
• Tools
R410A work requires a number of special tools. The items below (with * symbol) are specialized
for R410A. Make sure that R22 tools cannot be used on R410A systems.
Tool name
Pipe cutter
Flaring tool*
Torque wrench*
Expander
Pipe bender
Nitrogen gas
Welder
Gauge manifold*
Charging hose*
Vacuum pump (with adapter)*
Electronic scale for refrigerant
charging
Gas leak tester*
*: For details, refer to the service manual.
2-1. Important items when using refrigerant (R410A)
in 1/4 3/8
mm 6.35 9.52
JIS H3300 C1220T-O or equivalent*
mm 0.8
2
2
Pipe cutting
Pipe flaring work
Flare nut connection
Expansion at pipe connection
Pipe bending work
Pipe interior oxidation prevention
Pipe brazing
Vacuum evacuation and
refrigerant charging operation
check
Gas leakage test
- (06-14) -
1/2 5/8 3/4
12.70 15.88 19.05
1
1.0 1.2
R410A (Mixed refrigerant)
FVC68D
Process and application
Refrigerant piping work
Air pressure test
Air pressure test through
Refrigerant additional charging
Vacuum drying
Refrigerant additional charging
7/8 1-1/8
22.22 28.58
JIS H3300 C1220T-H
2
or equivalent*
1.0
2. Piping design