1
9
Configuration of connection pipe
1. Standard length of connection pipe
● 5m, 7.5m, 8m.
2. Min. length of connection pipe is 3m.
3. 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
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 R22, R407C, R410A and R134a
Diameter of connection pipe
Outdoor unit throttle
Liquid pipe(mm)
Gas pipe(mm)
Cooling only(g/m) Cooling and heating(g/m)
Φ6
Φ9.52 or Φ12
15
20
Φ6 or Φ9.52
Φ16 or Φ19
15
50
Φ12
Φ19 or Φ22.2
30
120
Φ16
Φ25.4 or Φ31.8
60
120
Φ19
-
250
250
Φ22.2
-
350
350
