Install Instructions

Installation Manual - B-VMH18,24UU-1
12
Fig. 8.1
Fig. 8.2
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. 8.1)
-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
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. 8.2)
The outdoor unit is installed higher than the indoor unit