
Configuration of connection pipe
1. Standard length of connection pipe : • 4m.
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
9000Btu/h (2637W)
15
5
12000Btu/h (3516W)
20
10
18000Btu/h (5274W)
25
10
24000Btu/h (7032W)
25
10
4. The additional refrigerant oil and refrigerant charging required after prolonging connection pipe is:
• After the length of connection pipe is prolonged for 10m at the basis of standard length, you
should add Sgrams of refrigerant oil for each additional Sm of connection pipe.
• The calculation method of the additional refrigerant charging amount (on the basis of liquid
pipe) is:
- Additional refrigerant charging amount = prolonged length of liquid pipe x additional
refrigerant charging amount per meter
• When the length of connection pipe is above Sm, add refrigerant according to the prolonged
length of liquid pipe. The additional refrigerant charging amount per meter is different
Sheet 2. Additional refrigerant charging amount for R32
Diameter of connection pipe mm
Indoor unit throttle
Outdoor unit throttle
Cooling only,
Cooling only
Cooling and heating
Liquid pipe
Gas pipe
cooling and heating
(g/ m)
(g/ m)
(g/ m)
<f:>6
<f:>9.5 or <f:>12
16
12
16
<f:>6 or <f:>9.5
<f:>16 or <f:>19
40
12
40
<f:>12
<f:>19 or <f:>22.2
80
24
96
6
<f:>25.4 or <f:>31.8
136
48
96
<f:>19
-
200
200
200
<f:>22.2
-
280
280
280
Note: The additional refrigerant charging amount in Sheet 2 is recommended
© 2018 EcoAir
29
All rights reserved