• Projection margin in flaring : | B |
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B (Unit : mm) |
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Rigid (Clutch type)
Outer diam. of | R410A tool used | Conventional tool used | ||
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copper pipe | R410A | R22 | R410A | R22 |
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6.4 | 0 to 0.5 | (Same as left) | 1.0 to 1.5 | 0.5 to 1.0 |
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9.5 | 0 to 0.5 | (Same as left) | 1.0 to 1.5 | 0.5 to 1.0 |
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12.7 | 0 to 0.5 | (Same as left) | 1.0 to 1.5 | 0.5 to 1.0 |
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15.9 | 0 to 0.5 | (Same as left) | 1.0 to 1.5 | 0.5 to 1.0 |
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Imperial (Wing nut type)
Outer diam. of copper pipe | R410A | R22 |
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6.4 | 1.5 to 2.0 | 1.0 to 1.5 |
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9.5 | 1.5 to 2.0 | 1.0 to 1.5 |
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12.7 | 2.0 to 2.5 | 1.5 to 2.0 |
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15.9 | 2.0 to 2.5 | 1.5 to 2.0 |
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Connection of refrigerant pipe
Connect all the refrigerant pipes with flare connecting work.
•Since the atmospheric pressure only is sealed as the sealing gas, it is not abnormal that “Pushu…” sound is not heard when the flare nut is removed.
•Be sure to use a double spanner for pipe connecting work of the indoor unit.
Airtight test/Air purge, etc.
For airtight test, air purge, addition of refrigerant, and gas leak check, follow the Installation Manual attached to the outdoor unit.
Open fully valves of the outdoor unit
Gas leak check
Check with a leak detector or soap water whether gas leaks or not, from the pipe connecting section or cap of the valve.
REQUIREMENT
Use a leak detector manufactured exclusively for HFC refrigerant (R410A, R134a, etc.).
Heat insulating process
Perform heat insulating for pipes at liquid side and gas side separately.
In cooling time, temperature at both liquid and gas sides becomes lower.
Therefore, perform heat insulating process sufficiently to avoid dewing.
•Apply heat insulator from the outside of the indoor unit. (In cases of drawing pipes from the rear side and from the right side)
Heat
Indoor insulator unit
Work using double spanner
• Refer to the following table for tightening torque.
Connecting pipe | Tightening torque | ||
outer dia. (mm) | (N•m) | torque (N•m) | |
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Ø6.4 | 14 to 18 | 18 | |
(1.4 to 1.8 kgf•m) | (1.8 kgf•m) | ||
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Ø9.5 | 33 to 42 | 42 | |
(3.3 to 4.2 kgf•m) | (4.2 kgf•m) | ||
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Ø12.7 | 50 to 62 | 50 | |
(5.0 to 6.2 kgf•m) | (5.0 kgf•m) | ||
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Ø15.9 | 68 to 82 | 68 | |
(6.8 to 8.2 kgf•m) | (6.8 kgf•m) | ||
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•For heat insulator of pipe at gas side, be sure to use one with
•Using the attached heat insulating pipe, perform heat insulating process securely for pipe connecting part of the indoor units without clearance.
Fix the pipe with vinyl tape.
Set the notched part to upper side.
Attached thermal insulation pipe
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