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REFRIGERANT PIPING CONNECTION
Safety Precautions
WARNING
• All field piping must be completed by a licensed technician and must comply with the
local and national regulations.
• When the air conditioner is installed in a small room, measures must be taken to
prevent the refrigerant concentration in the room from exceeding the safety limit in the
event of refrigerant leakage. If the refrigerant leaks and its concentration exceeds its
proper limit, hazards due to lack of oxygen may result.
• When installing the refrigeration system, ensure that air, dust, moisture or foreign
substances do not enter the refrigerant circuit. Contamination in the system may cause
poor operating capacity, high pressure in the refrigeration cycle, explosion or injury.
• Ventilate the area immediately if there is refrigerant leakage during the installation.
Leaked refrigerant gas can be both toxic and flammable. Ensure there is no refrigerant
leakage after completing the installation work.
Notes On Pipe Length and Elevation
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:
The Maximum Length And Drop Height
Based on Models. (Unit: m/ft.)
Type of
Capacity
(Btu/h)
model
<15K
North
America,
15K - <24K
Australia
and the EU
24K - <36K
frequency
conversion
36K - 60K
Split Type
CAUTION
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). See diagram for trap sizing and placement.
Length
Maximum
of
drop
piping
height
(m/ft)
(m/ft)
25/82
10/32.8
30/98.4
20/65.6
50/164
25/82
65/213
30/98.4
Indoor unit/
Outdoor unit
Indoor unit/
Outdoor unit
6m/20ft
(＜36000Btu/h unit)
10m/32.8ft
(≥36000Btu/h unit)
6m/20ft
(＜36000Btu/h unit)
10m/32.8ft
(≥36000Btu/h unit)
Page 17
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