Outdoor Unit | Installation Manual |
6 REFRIGERANT PIPING
CAUTION
TAKE NOTE OF THESE 4 IMPORTANT POINTS BELOW FOR PIPING WORK
1.Keep dust and moisture away from inside the connecting pipes.
2.Tightly connect the connection between pipes and the unit.
3.Evacuate the air in the connecting pipes using a
VACUUM PUMP.
4.Check for gas leaks at connected points.
Flaring
1.Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2.Insert the supplied flare nut into the pipe, and then flare the pipe.
As the flaring sizes of R410A differ from those of refrigerant R22, the flare tools newly manufactured for R410A are recommended.
However, the conventional tools | B |
can be used by adjusting the |
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projection margin of the copper |
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pipe. |
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Tightening of Flare Connections
1.Align the centers of the flare connections and fully tighten the flare nuts with your fingers.
Valve at liquid side
2.Use two wrenches to loosen or tighten the flare nut on the gas service valve as shown in the figure. Use only one wrench to loosen or tighten the flare not on the liquid service valve.
The final tightening with a torque wrench should be to the specifications shown in table below.
Unit : ft•lbs (N•m)
▼ Projection margin in flaring : B (Unit : in (mm)) Rigid (Clutch type)
Outer diameter of | R410A tool | Conventional | |
used | tool used | ||
copper pipe |
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R410A | 0.04” - 0.06” | ||
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1/4” (6.4) |
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0 - 0.02” (0 - 0.5) | (1.0 - 1.5) | ||
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1/2” (12.7) | |||
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▼ Flaring diameter size : A (Unit : in (mm))
Outer diameter of copper pipe | A |
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1/4” (6.4) | 0.39” (9.9) |
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1/2” (12.7) | 0.65” (16.6) |
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* In case of flaring for R410A with the |
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conventional flare tool, pull the tool out |
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approx. 0.02” (0.5 mm) more than that for |
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R22 to adjust it to the specified flare size. |
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The copper pipe gauge is useful for |
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adjusting the projection margin size. |
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Outer diameter of copper pipe | Tightening torque |
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1/4” (6.4 mm) | 10 - 13 (14 - 18) |
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1/2” (12.7 mm) | 37 - 46 (50 - 62) |
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Valve at gas side
EN
– 12 – |
