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Configuration of the Connection Pipe
• Standard length of connection pipe: 5m, 7.5m, 8m.
• Min. length of connection pipe is 3m.
• Max. length of connection pipe and max. high difference.
Cooling
capacity
Max. length
(of connection
pipe)
Max. height
difference
Cooling
capacity
max. length
(of connection
pipe)
Max. height
difference
5000Btu/h
(1465W)
15 5
24000Btu/h
(7032W)
25 10
7000Btu/h
(2051W)
15 5
28000Btu/h
(8204W)
30 10
9000Btu/h
(2637W)
15 5
36000Btu/h
(10548W)
30 20
12000Btu/h
(3516W)
20 10
42000Btu/h
(12306W)
30 20
18000Btu/h
(5274W)
25 10
48000Btu/h
(14064W)
30 20
• The additional refrigerant oil and refrigerant charging required after prolonging connection pipe
• After the length of connection pipe is prolonged for 10m at the basis of standard length, you should add 5ml
of refrigerant oil for each additional 5m of connection pipe.
• The calculation method of additional refrigerant charging amount (on the basis of liquid pipe):
Additional refrigerant charging amount = prolonged length of liquid pipe x additional refrigerant charging
amount per meter
• Basing on the length of standard pipe, add refrigerant according to the requirement as shown in the table.
The additional refrigerant charging amount per meter is different according to the diameter of liquid pipe.
See the following sheet.
Additional refrigerant charging amount for R22, R407C, R410A and R134a
Diameter of connection pipe Outdoor unit throttle
Ø Liquid pipe (mm) Ø Gas pipe (mm)
Cooling only
(g/m)
Cooling and heating
(g/m)
6 9.52 or 12 15 20
6 or 9.52 16 or 19 15 50
12 19 or 22.2 30 120
16 25.4 or 31.8 60 120
19 - 250 250
22.2 - 350 350
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