Airwell HKD, Installation Manual

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 Page 25 
Refrigerant Piping Connection
6
Refrigerant
Piping
Connection
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). A minimum pipe run of 3 metres is
required to minimise vibration & excessive noise.
For special tropical area, the maximum length of refrigerant pipe should not exceed 10 meters(32.8ft)
and no refrigerant can be added(For R290 refrigerant models).
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.
For R32/R290 refrigerant
models, the pipe connection points must be
placed outside of room.
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. Refer to
Fig. 5.1
for bad cut examples.
Oblique Rough Warped
90°
Fig. 5.1
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 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)
≥
36,000 and
≤
60,000 65 (213ft) 30 (98.5ft)