10. Installation
Outdoor unit
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.
Tool
Installation process/
purpose
Compatibility with
conventional tool
Pipe cutter
Refrigerant
pipe
installation
Pipe cutting
Compatible
Flaring tool
Pipe flaring
Refrigerant
machine oil
Apply
refrigerant
oil on flared
part
Exclusive ether oil, ester
oil, alkali benzene oil or
synthetic oil
Torque
wrench
Connect
flare nut
with pipe
Compatible
Pipe bender
Pipe
bending
Nitrogen
gas
Air
tightness
test
Prevent
oxidation
within the
pipe
Welder
Pipe
welding
Manifold
gage
Air
tightness
test ~
additional
refrigerant
charging
Vacuuming,
charging
refrigerant
and
checking
operation
Compatible
Refrigerant
charging
hose
Need exclusive one since
there is risk of refrigerant
leakage or inflow of
impurities
Tool
Installation process/
purpose
Compatibility with
conventional tool
Vacuum
pump
Pipe drying
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).
Scale for
refrigerant
charging
Refrigerant charging
Compatible
Gas leak
detector
Gas leak test
Need exclusive one
(Ones used for R-134a is
compatible)
Flare nut
Must use the flare nut equipped with the product.
Selecting refrigerant pipe
First branch joint
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.