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Refrigerant Piping Connection
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.
Note on Pipe Length
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 5 meters (16.5ft)( In North America, the standard pipe
length is 7.5m (25’). A minimum pipe run of 3 metres is required to minimise 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 10 meters(32.8ft).
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 (m)
Max. Drop Height (m)
< 15,000
25 (82ft)
10 (33ft)
≥ 15,000 and < 24,000
30 (98.5ft)
20 (66ft)
R410A,R32 Inverter Split Air
Conditioner
≥ 24,000 and < 36,000
50 (164ft)
25 (82ft)
< 18,000
10 (33ft)
5 (16ft)
15 (49ft)
8(26ft)
≥ 18,000 and < 21,000
R22 Fixed-speed
Split Air Conditioner
≥ 21,000 and < 35,000
10(33ft)
20 (66ft)
8(26ft)
< 18,000
20 (66ft)
R410A, R32 Fixed-speed
Split Air Conditioner
25 (82ft)
10(33ft)
≥ 18,000 and < 36,000
Connection Instructions – Refrigerant Piping
Step 1: Cut pipes
Oblique Rough Warped
90°
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.
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.
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.
Refrigerant piping
Connection
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