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MS-SVN15B-EN
Connection of Refrigerant Tubing
Connecting the unit with brazing procedure (Only for MCX/MWX 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.
NOTICE
System Component Damage!
These air handlers are shipped with dry nitrogen holding charge in the coil. Cut the
process tube or puncture the cap to bleed off the nitrogen prior to any brazing.
Temporarily cap off tubes if the refrigerant line connections are to be made later.
WARNING
Hazard of Explosion and Deadly Gases!
Never solder, braze or weld on refrigerant lines or any unit components that are above
atmospheric pressure or where refrigerant may be present. Always remove refrigerant
by following the guidelines established by the EPA Federal Clean Air Act or other state
or local codes as appropriate. After refrigerant removal, use dry nitrogen to bring
system back to atmospheric pressure before opening system for repairs. Mixtures of
refrigerants and air under pressure may become combustible in the presence of an
ignition source leading to an explosion. Excessive heat from soldering, brazing or
welding with refrigerant vapors present can form highly toxic gases and extremely
corrosive acids. Failure to follow all proper safe refrigerant handling practices could
result in death or serious injury.
Figure 9.
Figure 10.
Copper tube of
outdoor unit
Braze coupling
Copper tube
of indoor unit
Swaging
tool
Copper
tube
Tube holder
(Clamp)
