6
Unit Cooler Piping.
When brazing refrigerant lines, an inert
gas should be passed through the line at
low pressure to prevent scaling and
oxidation inside the tubing. Dry nitrogen
is preferred.
Use only a suitable silver solder alloy on
suction and liquid lines. All piping must
be adequately supported to prevent
vibration and breaking.
Tube clamps should have a gasket
surface to prevent abrasion.
The system as supplied by Turbo air was
thoroughly cleaned and dehydrated at the
factory.
Foreign matter may enter the system by
way of the evaporator to condensing unit
piping.
Therefore, care must be used during
installation of the piping to prevent
entrance of foreign matter.
Use only refrigeration grade copper
tubing
properly
sealed
against
contamination.
Figure 8. Suction piping installation on an
evaporator.
Figure 9. suction piping installation on
multiple evaporators.
Figure 10. Installation of expansion valve
bulb.
Refer to Figure 8 through 9. Suction line
risers must be carefully selected, have an
oil trap at the bottom and at 15 foot
intervals up the riser. They should be the
same size as the vertical riser connected
to its outlet. Riser should not be larger in
diameter than horizontal runs.
Refer to Figure 10.
Expansion valves are supplied with clamp
for securing bulb to the suction line. The
bulb must be secured at the evaporator
outlet, on the side of a horizontal run of
suction line, before any trap.
