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Refrigerant pipe installation
WARNING
• When installing, make sure there is no leakage. When
collecting the refrigerant, stop the compressor first before
removing the connection pipe. If the refrigerant pipe is not
properly connected and the compressor works with the service
valve open, the pipe inhales the air and it makes the pressure
inside of the refrigerant cycle abnormally high which may lead
to explosion and injury.
Refrigerant pipe work
• The length of refrigerant pipe should be as short as possible
and the height difference between an indoor and outdoor unit
should be minimized.
• Piping work must be done within allowable piping length,
height difference, and the allowable length after branching.
• The pressure of the R-410A is high. Use only certified
refrigerant pipe and follow the installation method.
• After installing the pipes, calculate the total length of the pipe
to check if additional refrigerant is needed. When you need
to charge the additional refrigerant, make sure to use R-410A
refrigerant.
• Use clean refrigerant pipe and there shouldn't be any harmful
ion, oxide, dust, iron content or moisture inside pipe.
• Use tools and accessories that fit on R-410A only.
Installation process/
Tool
purpose
Pipe cutter
Flaring tool
Refrigerant
machine oil
Refrigerant
pipe
installation
Torque
wrench
Pipe bender
Nitrogen
Air
gas
tightness
test
Welder
Manifold
Air
gage
tightness
Refrigerant
additional
charging
refrigerant
hose
charging
14
English
Compatibility with
conventional tool
Pipe cutting
Compatible
Pipe flaring
Apply
Exclusive ether oil, ester
refrigerant
oil, alkali benzene oil or
oil on flared
synthetic oil
part
Connect
flare nut
with pipe
Pipe
bending
Compatible
Prevent
oxidation
within the
pipe
Pipe
welding
Vacuuming,
Compatible
charging
refrigerant
Need exclusive one since
and
there is risk of refrigerant
checking
leakage or inflow of
operation
impurities
Installation process/
Tool
purpose
Vacuum
Pipe drying
pump
Scale for
refrigerant
Refrigerant charging
charging
Gas leak
Gas leak test
detector
Flare nut
Must use the flare nut equipped with the product.
Selecting refrigerant pipe
Increase the main
pipe size
• Install the refrigerant pipe according to main pipe size of each
outdoor unit capacity.
• When the pipe length (including elbow) between an outdoor
unit and the farthest indoor unit exceeds 90m, you must
increase the size of the pipe (main pipe) by one grade which
connects between the outdoor unit to the first branch joint.
• For H/R model, When the pipe length (including elbow)
between an outdoor unit and the farthest indoor unit exceeds
90m, you must increase the size of the liquid pipe by one grade
among the pipes(main pipe) which connects between the
outdoor unit to the first branch joint.
Compatibility with
conventional tool
Compatible (Use products
which contain the check
valve to prevent the oil
from flowing backward
into the outdoor unit.)
Use the one that can
be vacuumed up to
-100.7kpa(5Torr).
Compatible
Need exclusive one
(Ones used for R-134a is
compatible)
First branch joint
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