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9
Configuration of connection pipe and additional volume of refrigerant
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
Sheet 1 Max length of connection pipe
Capacity
5000 Btu/h
（1465 W）
7000 Btu/h
（2051 W）
9000 Btu/h
（2637 W）
12000 Btu/h
（3516 W）
18000 Btu/h
（5274 W）
4. The calculation method of additional refrigerant oil and refrigerant charging
amount 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):
(1) Additional refrigerant charging amount= prolonged length of liquid pipe × additional
refrigerant charging amount per meter
(2) When the length of connection pipe is above 5m, add refrigerant according
to the prolonged length of liquid pipe. The additional refrigerant charging
amount per meter is different according to the diameter of liquid pipe. See Sheet 2.
Max length of
connection pipe
15
15
15
20
25
23
Unit: m
Max length of
Capacity
connection pipe
24000 Btu/h
（7032 W）
28000 Btu/h
（8204 W）
36000 Btu/h
（10548 W）
42000 Btu/h
（12306 W）
48000 Btu/h
（14064 W）
INSTALLATION INSTRUCTIONS
25
30
30
30
30
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