20
Tubing Installation
Observe the following when installing correctly
sized type “L” refrigerant tubing between the
condensing unit and evaporator coil:
• Check the tables on page 12 for the correct
suction line size and liquid line size.
• If a portion of the liquid line passes through a
very hot area where liquid refrigerant can be
heated to form vapor, insulating the liquid line is
required.
• Use clean, dehydrated, sealed refrigeration-grade
tubing.
• Always keep tubing sealed until tubing is in place
and connections are to be made.
• A high-quality biflow filter drier is included with all
R-410A heat pump units and must be installed in
the liquid line upon unit installation.
• When replacing an R-22 system with an R-410A
system and the line set is not replaced, use a
flush kit available through aftermarket stores such
as Prostock.
• If tubing has been cut, make sure ends are
deburred while holding in a position to prevent
chips from falling into tubing. Burrs such as those
caused by tubing cutters can affect performance
dramatically, particularly on small liquid line sizes.
• For best operation, keep tubing run as short as
possible with a minimum number of elbows or
bends.
• Locations where the tubing will be exposed to
mechanical damage should be avoided. If it is
necessary to use such locations, the copper
tubing should be housed to prevent damage.
Tubing
INSTALLATION
Interconnecting Tubing (cont.)
