8 REFRIGERANT PIPING
• Projection margin in flaring : | B |
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.
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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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.).
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