Installation
Page 135
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.
Size
Max. Length
(m/ft)
Max. Elevation
(m/ft)
35M
25/82 10/32.8
53M
30/98.4 20/65.6
70M-88M
50/164 25/82
105M-160T
75/246.1
30/98.4
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 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 6m(20ft) of vertical
suction line riser (<36000Btu/h unit).
-An oil trap should be installed every 10m(32.8ft) of
vertical suction line riser (≥36000Btu/h unit).
10m/32.8ft (≥36000Btu/h unit)
6m/20ft (＜36000Btu/h unit)
10m/32.8ft (≥36000Btu/h unit)
6m/20ft (＜36000Btu/h unit)
Outdoor unit
Indoor unit/
Outdoor unit
6.2 The procedure of connecting pipes
1.Choose the pipe size according to the specification table.
2.Confirm the cross way of the pipes.
3.Measure the necessary pipe length.
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