36
Installation Manual
5.8 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)
Ф6
Ф9.52 or Ф12
15
20
Ф6 or Ф9.52
Ф16 or Ф19
15
50
Ф12
Ф19 or Ф22.2
30
120
Ф16
Ф25.4 or Ф31.8
60
120
Ф19
-
250
250
Ф22.2
-
350
350
