35 / 172 EN
Split Type Air Conditioner / User Manual
5 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.
C
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)
R410A,R32 Inverter Split
Air Conditioner
< 15,000 25 (82ft) 10 (33ft)
≥ 15,000 and < 24,000 30 (98.5ft) 20 (66ft)
≥ 24,000 and < 36,000 50 (164ft) 25 (82ft)
R22 Fixed-speed Split Air
Conditioner
< 18,000 10 (33ft) 5 (16ft)
≥ 18,000 and < 21,000 15 (49ft) 8 (26ft)
≥ 21,000 and < 35,000 20 (66ft) 10 (33ft)
R410A, R32 Fixed-speed
Split Air Conditioner
< 18,000 20 (66ft) 8 (26ft)
≥ 18,000 and < 36,000 25 (82ft) 10 (33ft)
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