Refrigerant Piping
Connection
Page
22
Oil traps
CAUTION
•
If the indoor unit is installed higher than
the outdoor unit:
An oil trap should be installed every 10m
(32.8ft) of vertical suction line riser.
(See Fig.
7.2
)
-If oil flows back into the outdoor unit’s
compressor, this might cause liquid
compression or deterioration of oil return.
Oil traps in the rising gas piping can
prevent this.
CAUTION
Fig.
7.2
The indoor unit is installed higher than the
outdoor unit
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.
7.3
)
Fig.
7.3
The outdoor unit is installed higher than the
indoor unit
