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INSTALLATION
Interconnecting Tubing (cont�)
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 10 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 filter drier is included with all
R-410A 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, drain
any oil that has pooled in low spots in the
18
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, 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�
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