28
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Sealing test and vacuuming
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In order to prevent mixing of other refrigerant or refrigerant oil, be sure to use a gauge manifold, charge hose
and vacuum pump that are exclusively for R410A.
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Be sure to perform a sealing test. If R410A leaks, there is a possibility that the composition of the refrigerant
inside the equipment will change. If there is a leak, the refrigerant must be recovered and then recharged. Do
not perform additional charging. (See “4-7. 1) Refrigerant vapor leakage test” on page 32.)
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Since systems with R410A are much more susceptible to damage from moisture than systems with the previous
type of refrigerant, always perform a thorough vacuuming (drying) to prevent equipment breakdown. (See “4-7.
2) Vacuuming with a vacuum pump” on page 33.)
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Charging refrigerant
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Never charge R410A as a vapor. Always charge as a liquid. Charging as a vapor may cause a compositional
change of the refrigerant, and could result in a performance decline or a breakdown.
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Notes when doing flare process
The R410A flare dimensions differ from the previous R407C dimensions.
We recommend using the R410A flare tool, but if the protrusion amount B can be adjusted with the protrusion
adjusting gauge, the old tool can be used.
Flare pipe end: A inch (mm)
Protrusion amount of copper pipe for flare process: B inch (mm)
Copper pipe outer
diameter inch (mm)
A
0
-0.015 (-0.4) inch (mm)
1/4” (ø 6.4)
0.36 (9.1)
0.52 (13.2)
0.65 (16.6)
0.78 (19.7)
0.94 (24.0)
3/8” (ø 9.5)
1/2” (ø 12.7)
5/8” (ø 15.9)
3/4” (ø 19.1)
Copper pipe outer
diameter
inch (mm)
In the case of rigid (clutch)
When using the R410A tool
When using the old tool
1/4” (ø 6.4)
0 to 0.019
(0 to 0.5)
0.039 to 0.059
(0.7 to 1.3)
3/8” (ø 9.5)
1/2” (ø 12.7)
5/8” (ø 15.9)
3/4” (ø 19.1)
B
Summary of Contents for AWGP180E1NHS
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