Installation
Page 47
ing pipe.
• Each indoor unit of the system should be installed it.
• The installation should be considering the conve-
nience for future cleaning.
9. The end of drainage pipe shall not contact with ground
directly.
5.3 Insulation work of drainage pipe
Refer the introduction to the insulation engineering
parts.
6. Refrigerant Pipe Installation
6.1 Maximum length and drop height
Ensure that the length of the refrigerant pipe, the number
of bends, and the drop height between the indoor and
outdoor units meets the requirements shown in the
following table.
Model
Max. Length
(m/ft)
Max. Elevation
(m/ft)
53M
30/98.4 20/65.6
Caution:
1. The capacity test is based on the standard length and
the maximum permissive length is based on the system
reliability.
2. Oil traps
If
the indoor unit is installed higher than the outdoor unit:
-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 10m(32.8ft) of vertical
suction line riser.
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
below 7.62m/s(1500fpm (feet per minute)), oil return
will be decreased. An oil trap should be installed every
6m(20ft) of vertical suction line riser.
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