14 49-7835 Rev. 8
ENGLISH
Step 3 - Installation of the Outdoor Unit (Cont.)
C. Install Copper Lineset
• The standard line set length is 25 feet. If
the installation length is different, adjust the
refrigerant charge by adding 0.2 oz/ft if the liquid
line is 1/4”, or 0.5 oz/ft if the liquid line is 3/8”.
• See table on page 15.
• Cut the line set to length.
• Place nut over the pipe and then flare with the
R-410A flaring tool.
NOTE: Follow standard practices for creating
pipe flares. When cutting and reaming the
tubing, use caution to prevent dirt or debris from
entering the tubing. Remember to place nut over
the tubing before flaring.
• To join the line set, directly align the tubing flare
to the fitting on the other pipe. Slide the nut
onto the fitting and hand tighten.
• Torque the fittings according to the
specifications shown in the torque chart below.
• Two wrenches are required
to join the flare connection;
one standard wrench and one
torque wrench adjusted to the
proper settings.
• Repeat the process for
attaching the other end of the
line set.
D. Leak Test
• Remove the cap on the service valve.
• Using a tank of dry nitrogen and approved
regulator, charge the system with 150 psig of dry
nitrogen using mini split adapter to connect the
valve.
• Check for leaks at the flare fittings using soap
bubbles or another detection device. If a leak
is detected, make repairs to the fittings and
recheck. If no leaks are detected within 3
minutes, proceed.
• Using the same tank/regulator, charge the
system to 300 psig.
• Check for leaks as earlier. If no leaks are
detected within 3 minutes, proceed.
• Using the same tank/regulator, charge the
system to 500 psig.
• Check for leaks as earlier. Keep system
pressurized for at least 20 minutes.
WARNING
Do not use acetylene, oxygen,
compressed air or any mixture containing anything
other than dry nitrogen. Use only dry nitrogen for
pressure testing. Do not use mixtures of hydrogen
containing refrigerant and air above atmospheric
pressure for pressure testing, as they may become
flammable and could result in an explosion.
Refrigerant, when used as a trace gas, should only
be mixed with dry nitrogen for pressurizing units.
Failure to follow these recommendations could
result in death or serious injury as well as equipment
or property damage.
Half union
Flare nut
Torque wrench
Spanner
Forced fastening without careful centering may
damage the threads and cause a refrigerant leak.
Pipe Diameter(ǿ) Fastening torque
Liquid side 6.35mm(1/4") 18N.m/13.3Ft.lbs
Liquid/Gas side 9.52mm(3/8")
42 N.m/30.1Ft.lbs
Gas side 12.7mm(1/2") 55N.m/40.6Ft.lbs
Gas side 15.88mm(5/8") 60 N.m/44.3Ft.lbs
Half union
Flare nut
Torque wrench
Spanner
Forced fastening without careful centering may
damage the threads and cause a refrigerant leak.
Pipe Diameter(ǿ) Fastening torque
Liquid side6.35mm(1/4") 18N.m/13.3Ft.lbs
Liquid/Gas side9.52mm(3/8") 42 N.m/30.1Ft.lbs
Gas side 12.7mm(1/2") 55N.m/40.6Ft.lbs
Gas side 15.88mm(5/8") 60 N.m/44.3Ft.lbs
INSTALLATION INSTRUCTIONS
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