Trane New Stylus MS-SVN015-EN - Manual (Page 8)

8 MS-SVN015-EN
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).
10. Tighten the flare nut to the
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
9.53 mm (3/8") dia. 350~400 300~340
12.7 mm (1/2") dia. 500~550 430~470
15.88 mm (5/8") dia. 600~650 520~570
11. Repeat the process above for the
remaining line.
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).
- Expand the copper tube by
using a swaging tool set as in
Figure 20.
4. Clean internal and external surfaces
of coupling or expanded tube prior
to brazing.
Figure 17
Figure 18
Figure 20
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.
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
while brazing.
11. Braze using accepted good
brazing techniques.
Copper tube of
outdoor unit
Solder coupling
Swaging
tool
Copper
tube
Tube holder
(Clamp)
Union Flare nut
Solder
coupling
CO
MM ET 3
Figure 21
Torch
Copper tube
from indoor
unit
Solder rod
Copper tube from
outdoor unit
Solder
coupling
CO MM ET 3
Figure 22
Torch
Copper tube
from indoor
unit
Solder rod
Copper tube from
outdoor unit
Copper tube
of indoor unit
Indoor unit
pipe
Wrench
(adjustable)
Torque
wrench
Flare nut
Connection pipe
Connection of Refrigerant Tubing
MS-SVN015-EN.p65 6/27/07, 11:23 AM 8
Black