Oil Traps
1 If the indoor unit is installed higher than the outdoor unit:
CAUTION
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.
An oil trap should be installed every 1 0m (32.Sft) of vertical suction line riser.
2 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 shouId be maintained with suction gas velocity. If velocities drop below
7.62m/s(1 500fpm (feet per minute)), oil return will be decreased. An oil trap should
be installed every 6m(20ft) of vertical suction line riser.
Indoor unit
Outdoor unit
Gas piping
Liquid piping
10m/32.8ft
10m/32.8ft
Oil trap
Indoor unit
Outdoor unit
Gas piping
Liquid piping
6m/20ft
6m/20ft
!!
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