Trane MS-SVN015-EN Connection, Connecting the unit with brazing procedure Only for MCX

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 042-060)

1.Cut the copper tube to the required length with a tube cutter. It is recommended to cut approx. 20-30 cm. longer than the tube length you estimate.

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	lbf-in
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		MS-SVN015-EN
MS-SVN015-EN.p65	8	6/27/07, 11:23 AM
	Black