Multizone Outdoor Unit Installation Manual

Revised 5/14/2020
6
Refrigerant Piping Connection
Safety Precautions
Refrigerant Piping Connection Instructions
Refrigerant Piping
Connection
 Page 11 
WARNING
• All eld piping must be completed by
a licensed technician and must comply
with the local and national regulations.
• When the air conditioner is installed
in a small room, measures must
be taken to prevent the refrigerant
concentration in the room from
exceeding the safety limit in the event
of refrigerant leakage. If the refrigerant
leaks and its concentration exceeds
its proper limit, hazards due to lack of
oxygen may result.
• When installing the refrigeration
system, ensure that air, dust, moisture
or foreign substances do not enter
the refrigerant circuit. Contamination
in the system may cause poor
operating capacity, high pressure in the
refrigeration cycle, explosion or injury.
• Ventilate the area immediately if
there is refrigerant leakage during the
installation. Leaked refrigerant gas
is both toxic and ammable. Ensure
there is no refrigerant leakage after
completing the installation work.
Step1: Cut pipes.
When preparing refrigerant pipes, take extra care
to cut and are them properly. This will ensure
ecient operation and minimize the need for
future maintenance.
1. Measure the distance between the indoor and
outdoor units.
2. Using a pipe cutter, cut the pipe a little longer
than the measured distance.
Step 2: Remove burrs.
Burrs can aect the air-tight seal of refrigerant
piping connection. They must be completely
removed.
1. Hold the pipe at a downward angle to prevent
burrs from falling into the pipe.
2. Using a reamer or deburring tool, remove all
burrs from the cut section of the pipe.
1. Make sure that the pipe is cut at a perfect
90° angle. Refer to Fig. 7.1 for examples of
bad cuts.
Oblique Rough Warped
90
°
CAUTION
• The branching pipe must be installed
horizontally. An angle of more than 10°
may cause malfunction.
• DO NOT install the connecting pipe
until both indoor and outdoor units
have been installed.
• Insulate both the gas and liquid piping
to prevent condensation.
CAUTION
DO NOT deform pipe while cutting. Be extra
careful not to damage, dent, or deform
the pipe while cutting. This will drastically
reduce the heating eciency of the unit.