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CAUTION
If the outdoor unit is installed higher than
the indoor unit:
-It is recommended that vertical suction
risers not be upsized. Proper oil return to
the compressor should be maintained with
suction gas velocity. If velocities drop
below7.62m/s (1500fpm (feet per minute)),
oil return will be decreased. An oil trap
should be installed every 6m(20ft) of
vertical suction line riser. (See Fig. 6.2)
Fig. 6.2
The outdoor unit is installed higher than the indoor unit
Page 5
Refrigerant Piping Connection Instructions
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 water leakage.
Step1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.
refrigerantmodels, the pipe connection
points must be placed outside of room.
The connection pipes can not be reused.
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.
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 efficiency of the unit.
1. Make sure that the pipe is cut at a perfect
90° angle. Refer to Fig. 6.3 for examples of
bad cuts.
90°
Oblique
Fig. 6.3
For R32/R290
Rough
Warped
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