3. FLARING WORK AND PIPE CONNECTION
3-1. FLARING WORK
1)Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)
2)Completely remove all burrs from the cut cross section of pipe. (Fig. 3)
•Put the end of the copper pipe to downward direction as you remove burrs in order to avoid to let burrs drop in the piping.
3)Remove flare nuts attached to indoor and outdoor units, then put them on pipe having completed burr removal. (Not possible to put them on after flaring work.)
4)Flaring work (Fig. 4, 5). Firmly hold copper pipe in the dimension shown in the table. Select A mm from the table according to the tool you use.
5)Check
•Compare the flared work with Fig. 6.
•If flare is noted to be defective, cut off the flared section and do flaring work again.
| Good | No good |
| Copper |
|
| pipe |
|
| Tilted Uneven Burred | |
| Fig. 1 | Fig. 2 |
| Flaring tool | |
Burr | Copper pipe |
|
| Spare reamer |
|
| Pipe cutter |
|
| Clutch type | Wing nut type |
| Fig. 3 | Fig. 4 |
|
| Inside is shin- |
| Smooth all | ing without any |
| around | scratches. |
Die | Copper pipe |
|
| Even length | |
|
| |
Flare nut | all around | |
| ||
| Fig. 5 | Fig. 6 |
Pipe diameter | Nut |
| A [mm (inch)] |
| Tightening torque |
| |||
[mm (inch)] | (mm) | Clutch type tool | Clutch type tool | Wing nut type tool | N•m | kgf•cm |
| ft·Ib | |
for R410A | for R22 | for R22 |
| ||||||
|
|
|
|
|
|
| |||
ø6.35 | (1/4) | 17 |
|
| 1.5 to 2.0 | 13.7 to 17.7 | 140 to 180 |
| 10 to 13 |
ø9.52 | (3/8) | 22 | 0 to 0.5 | 1.0 to 1.5 | (0.06 to 0.08) | 34.3 to 41.2 | 350 to 420 |
| 25 to 30 |
ø12.7 | (1/2) | 26 | (0. to 0.02) | (0.04 to 0.06) | 2.0 to 2.5 | 49.0 to 56.4 | 500 to 575 |
| 36 to 42 |
ø15.88 | (5/8) | 29 |
|
| (0.08 to 1.0) | 73.5 to 78.4 | 750 to 800 |
| 54 to 58 |
3-2. PIPE CONNECTION
•Fasten flare nut with a torque wrench as specified in the table.
•When fastened too tight, flare nut may brake after a long period and
cause refrigerant leakage.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same manner applied for indoor unit.
•For tightening, use a torque wrench or spanner and use the same tightening torque applied for indoor unit.
3-3. INSULATION AND TAPING
1)Cover piping joints with pipe cover.
2)For outdoor unit side, surely insulate every piping including valves.
3)Using piping tape (E), apply taping starting from the entry of outdoor unit.
•Stop the end of piping tape (E) with tape (with adhesive agent at- tached).
•When piping have to be arranged through above ceiling, closet or where the temperature and humidity are high, wind additional com- mercially sold insulation to prevent condensation.
