MS-SVN15B-EN
11
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.
The indoor unit refrigerant line connections are flared. Installation brazing, leak testing, and
evacuation of refrigerant lines are covered in the Installer Manual, packaged with the outdoor
unit. Read the instructions before installing the refrigerant lines.
The indoor unit refrigerant piping connections are located on the right hand side when facing the
unit (Figure 11).
Connecting the unit with flaring procedure. (Only for MCX/MWX 512-536)
1.
Flaring (If piping is procured or cut at the site). Cut the copper tube to the required length
with a tube cutter. It is recommended to cut approx. 30-50 cm. longer than the tubing length
you estimate.
2.
Hold each pipe downward when cutting and remove burrs at the end of the copper tube with
a tube reamer or file. This process is important and should be done carefully to make a good
flare (Figure 12 and Figure 13).
When reaming, hold the tube end downward and be sure that no copper scraps fall into the
tube.
3.
Remove the flare nut from the unit and be sure to mount it on the copper tube.
Connection of Refrigerant Tubing
Figure 1.
Figure 2.
Copper
tubing
Reamer
