Connection of Refrigerant Tubing
Connection
9.For proper connection, align the union tube and flare tube straight with each other, then screw in the flare nut lightly at first to obtain a smooth match (Figure 17).
Union Flare nut
Figure 17
10. Tighten the flare nut to the |
Connecting the unit with brazing procedure (Only for MCX
1.Cut the copper tube to the required length with a tube cutter. It is recommended to cut approx.
2.Remove burrs at the end of the copper tube with a tube reamer (Figure 12).
3.There are 2 ways to connect the copper tube
-Use a coupling between the copper tube of indoor unit and the copper tube used for installation (Figure 19).
5.Insulate the entire gas line.
6.Do not allow uninsulated liquid line to come in direct contact with bare gas line.
7.Precautions should be taken to avoid heat damage to the pressure tap valve core during brazing. It is recommended that a wet rag be wrapped around the valve body.
8.It is recommended to use braze shield, soak pad in water and place over suction and liquid lines to protect unit finish.
9.To braze the copper tube, before brazing a copper tube to a solder coupling or a copper tube to an expanded tube, do not forget to keep them tight as shown in Figure 21, 22.
specified tightening torque with |
torque wrench and adjustable |
wrench (Figure 18). |
Flare Nut Tightening Torque
Flare Nut/Piping Size Tightening | Torque |
kgf, - cm | |
6.35 mm (1/4") dia. 150~200 | 130~170 |
|
|
Copper tube of indoor unit
Solder coupling
Copper tube of outdoor unit
COMM
ET 3
Solder rod
Torch
Copper tube from indoor unit
Solder coupling
Copper tube from outdoor unit
9.53 mm (3/8") dia. | 350~400 | 300~340 |
12.7 mm (1/2") dia. | 500~550 | 430~470 |
|
|
|
Figure 19
- Expand the copper tube by |
Figure 21
Torch
15.88 mm (5/8") dia. 600~650 520~570 |
using a swaging tool set as in |
Figure 20. |
Swaging
tool
COMMET 3
Solder rod
Copper tube from indoor unit
Solder coupling
Copper tube from outdoor unit
Indoor unit | Wrench |
| |
(adjustable) | Copper | ||
pipe | |||
| tube | ||
|
| ||
Torque |
|
| |
wrench | Connection pipe |
| |
| Flare nut |
|
Tube holder
(Clamp)
Figure 22
10. Use a dry nitrogen purge and |
brazing alloy without flux when |
brazing the field line to the |
copper factory connection. Flow |
dry nitrogen into either valve |
pressure tap port, through the |
tubing and out the other port |
Figure 18 | Figure 20 |
| |
11. Repeat the process above for the | 4. Clean internal and external surfaces |
remaining line. | of coupling or expanded tube prior |
| to brazing. |
while brazing. |
11. Braze using accepted good |
brazing techniques. |
8 |
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8 | 6/27/07, 11:23 AM | |
| Black |
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