Digital Inverter
Flaring
1.Cut the pipe with a pipe cutter.
Be sure to remove burrs that may cause a gas leak.
2.Insert a flare nut into the pipe, and then flare the pipe. Use the flare nuts supplied with the air conditioner or those for R410A.
Insert a flare nut into the pipe, and 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 can be used by adjusting the projection margin of the copper pipe.
Projection margin in flaring: B (Unit: mm)
Connecting the Gas Side Pipe
REQUIREMENT
•Be sure to use the Ø19.1 mm pipe and joint provided as accessories of the outdoor unit to connect the gas side Ø19.1 mm pipe and Ø28.6 mm pipe.
•When leading out the pipes toward the front, to one of the sides or toward the rear, use the Ø19.1 mm pipe and elbow provided as accessories of the outdoor unit, and adjust the bending direction. Cut the Ø19.1 mm pipe to the required length before using it.
1. | Align the provided Ø19.1 mm pipe with the pipe |
| direction, and shape it so that its end comes out from the |
| outdoor unit. |
2. | On the outside of the outdoor unit, use the provided |
| joints, and braze the Ø19.1 mm pipe and Ø28.6 mm pipe. |
Digital Inverter
Tightening of Connecting Part
1.Align the centers of the connecting pipes and fully tighten the flare nut with your fingers. Then fix the nut with a wrench as shown in the figure and tighten it with a torque wrench.
Half union or packed valve | Flare nut |
Externally | Internally threaded |
threaded side | side |
Fix with wrench. | Tighten with torque wrench. |
2. As shown in the figure, be sure to use two wrenches to |
loosen or tighten the flare nut of the valve on the gas |
side. If you use a single crescent, the flare nut cannot be |
tightened to the required tightening torque. |
On the other hand, use a single crescent to loosen or |
•After the installation work, be sure to check for gas leaks of the pipe connections with nitrogen.
•Pressure of R410A is higher than that of R22 (Approx.
1.6 times).
Therefore, using a torque wrench, tighten the flare pipe connecting sections that connect the indoor/outdoor units at the specified tightening torque.
Incomplete connections may cause not only a gas leak, but also trouble with the refrigeration cycle.
Do not apply refrigerant oil to the flared surface.
Branch Pipe
Carry out the refrigerant piping work using the branch pipe kit which is purchased separately.
Branch pipe installation
Rigid (Clutch type)
Outer diam. of |
| R410A tool used | Conventional tool |
copper pipe |
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| R410A |
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9.5 |
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12.7 |
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Joint (accessory)
tighten the flare nut of the valve on the liquid side. |
| (Unit: N•m) |
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Outer dia. of copper pipe | Tightening torque |
9.5 mm (diam.) | 33 to 42 (3.3 to 4.2 kgf•m) |
12.7 mm (diam.) | 50 to 62 (5.0 to 6.2 kgf•m) |
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15.9 mm (diam.) | 68 to 82 (6.8 to 8.2 kgf•m) |
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19.1 mm (diam.) | 100 to 120 (10.0 to 12 kgf•m) |
The ends of the branch pipes form a line perpendicular to the ground.
Both the collecting pipe and branch pipes form a line parallel to the ground.
The ends of the branch pipes form a line perpendicular to the ground.
Both the collecting pipe and branch pipes form a line parallel to the ground.
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15.9 |
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19.1 |
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Flaring diameter size: A (Unit: mm) |
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Outer diam. of copper pipe | ||||||||
9.5 |
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Joint (accessory)
Ø19.1 mm pipe (accessory)
Ø28.6 mm pipe (procured locally)
Ø19.1 mm pipe | : Brazing | |
(accessory) | ||
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Ø19.1 mm pipe | Brazing |
Cover |
Cap |
Loosened | Piping valve |
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| Tightened |
Branch pipe
Collecting pipe
Gas side
NO GOOD | Inclined |
Branch pipe
Collection area
Liquid side
Make sure that the pipes are installed level after branching.
12.7 | 16.6 |
15.9 | 19.7 |
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19.1 | 24.0 |
*In case of flaring for R410A with the conventional flare tool, pull the tool out approx. 0.5 mm more than that for R22 to adjust it to the specified flare size.
The copper pipe gauge is useful for adjusting the projection margin size.
(accessory) |
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Elbow (accessory) | Ø19.1 mm pipe |
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REQUIREMENT
•Before proceeding to weld the refrigerant pipe, be sure to pass nitrogen through the pipe to prevent oxidation inside it. If nitrogen is not passed through the pipe, the refrigerating cycle may become clogged by oxidized scales.
•The Ø28.6 mm pipe cannot be passed through the pipe cover and knockout hole in the base plate so be sure to connect the Ø19.1 mm pipe and Ø28.6 mm pipe outside the outdoor unit.
Flare nut |
Valve at gas side |
CAUTION
1.Do not put the crescent wrench on the cap or cover. The valve may break.
2.If applying excessive torque, the nut may break according to some installation conditions.
Cover
NO GOOD
Cap
Length of straight sections on main pipe side of branch pipe
Provide a straight section with a length of at least 500 mm on the main pipe side of the branch pipe. (Same for both liquid side and gas side)
500 mm or more
500 mm or more
EN | 11 | 12 | EN |
