Installation
Page 45
Seal
Drain joint
A B
Base pan hole of
outdoor unit
Seal
5. Refrigerant Pipe Installation
5.1 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.
Capacity(kBtu/h)
Max. Length
(m/ft)
Max. Elevation
(m/ft)
12 20/65.6 8/26.2
18/24 25/82 10/32.8
caution:
• The capacity test is based on the standard length and
the maximum permissive length is based on the system
reliability.
• Oil traps
If the indoorunitis installedhigherthanthe outdoorunit:
-If oilflowsbackintotheoutdoorunit’scompressor,this
might cause liquid compression or deterioration of oil
return. Oiltrapsintherising gaspipingcanpreventthis.
An oil trap should be installed every 10m(32.8ft) of vertical
suction line riser.
The indoorunitis installedhigherthanthe outdoorunit
If theoutdoorunitis installedhigherthanthe indoorunit:
-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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