18
1. Standard length of connection pipe
● 5m, 7.5m, 8m.
2. Min length of connection pipe
For the unit with standard connection pipe of 5m, there is no limitation for the min length
of connection pipe. For the unit with standard connection pipe of 7.5m and 8m, the min
length of connection pipe is 3m.
3. Max. length of connection pipe and max. high difference.
Cooling capacity
Max length of
connection pipe
Cooling capacity
Max length of
connection pipe
5000Btu/h (1465W)
15
24000Btu/h (7032W)
25
7000Btu/h (2051W)
15
28000Btu/h (8204W)
30
9000Btu/h (2637W)
15
36000Btu/h (10548W)
30
12000Btu/h (3516W)
20
42000Btu/h (12306W)
30
18000Btu/h (5274W)
25
48000Btu/h (14064W)
30
4. 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 ×
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 R32
Diameter of connection pipe Indoor unit throttle
Outdoor unit throttle
Liquid pipe(mm) Gas pipe(mm)
Cooling only,
cooling and heating
(g/m)
Cooling only
(g/m)
Cooling and
heating
(g/m)
Φ6
Φ9.52 or Φ12
16
12
16
Φ6 or Φ9.52
Φ16 or Φ19
40
12
40
Φ12
Φ19 or Φ22.2
80
24
96
Φ16
Φ25.4 or Φ31.8
136
48
96
Φ19
-
200
200
200
Φ22.2
-
280
280
280
Configuration of connection pipe
Note:
The additional refrigerant charging amount in Sheet is recommended value, not compulsory.
