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Page 31
Note on Pipe Length
Connection Instructions – Refrigerant Piping
Step 1: Cut pipes
When preparing refrigerant pipes, take extra
care to cut and flare them properly. This will
ensure efficient operation and minimize the
need for future maintenance.
When connecting refrigerant piping, do not
let substances or gases other than the specified
refrigerant enter the unit. The presence of other gases or substances will lower the unit’s capacity,
and can cause abnormally high pressure in the refrigeration cycle. This can cause explosion and
injury.
1. Measure the distance between the indoor and
outdoor units.
2.
Using a pipe cutter, cut the pipe a little longer than
the measured distance.
3.
Make sure that the pipe is cut at a perfect 90°angle.
Oblique Rough Warped
90°
DO NOT DEFORM PIPE
WHILE CUTTING
Be extra careful not to damage, dent, or
deform the pipe while cutting. This will
drastically reduce the heating efficiency
of the unit.
The length of refrigerant piping will affect the performance and energy efficiency of the unit. Nominal
efficiency is tested on units with a pipe length of 16.5ft (5 meters)(
In North America, the standard pipe
length is 25ft (7.5m)
. A minimum pipe run of 9.8ft (3 meters) is required to minimize vibration &
excessive noise. In special tropical area, for the R290 refrigerant models, no refrigerant can be added
and the maximum length of refrigerant pipe should not exceed 32.8ft (10 meters).
Refer to the table below for specifications on the maximum length and drop height of piping.
Maximum Length and Drop Height of Refrigerant Piping per Unit Model
Model Capacity (BTU/h) Max. Length (ft/m)
Max. Drop Height (ft/m)
R410A,R32 Inverter Split Air
Conditioner
R22 Fixed-speed
Split Air Conditioner
R410A, R32 Fixed-speed
Split Air Conditioner
< 15,000
< 18,000
82ft (25) 10 (33ft)
33ft (10) 16ft (5)
≥ 15,000 and < 24,000
98.5ft (30) 66ft (20)
66ft (20)
≥ 24,000 and < 36,000
164ft (50) 82ft (25)
≥ 21,000 and < 35,000
33ft (10)
≥ 18,000 and < 21,000
≥ 18,000 and < 36,000
49ft (15)
26ft (8)
26ft (8)
< 18,000
66ft (20)
82ft (25)
33ft (10)
Refrigerant Piping Connection
Refrigerant
Piping
Connection
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