18
Tubing Installation
Observe the following when installing correctly
sied type refrigerant tubing between the
condensing unit and evaporator coil:
• hec the tables on pages 16 1 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 eep tubing sealed until tubing is in
place and connections are to be made.
• A high-quality filter drier is included with all
R-410A units and must be installed in the liquid
line upon unit installation.
• hen replacing an -22 system with an -410A
system and the line set is not replaced, drain
any oil that has pooled in low spots in the
lineset. Commercially available flush kits are
not recommended due to the risk of residual
flushing agent being incompatible with POE oils
or internal components. Up to 5% mineral oil is
considered acceptable in R-410A systems.
• If tubing has been cut, mae 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.
• or best operation, eep tubing run as short as
possible with a minimum number of elbows or
bends.
• ocations 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.
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