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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.
4. The additional refrigerant oil and refrigerant charging required after prolonging
connection pipe
● After the length of connection pipe is prolonged for 10 m at the basis of standard length ,
you should add 5ml of refrigerant oil for eac h additional 5m of connection pipe.
● Thecalculation methodof additional refrige r ant charging amount (onthe basis of liquid
pipe):
Additional refrigerant charging amount = prolonged length of liquid pipe (m)
x additional refrigerant charging amount per meter
● Basing on the length of standard pipe, ad d refrigerant according to the requirement
as shown in the table. The additional refrigera nt charging amount per meter is di fferent
according to the diameter of liquid pipe. Se e the following sheet.
Additional refrigerant charging amount for R410 A
Diameter of connection pipe Extra refrigerant charge
Liquid pipe(in) Gas pipe(in ) Cooling and heating(g/m)
15/64 3/8 or 1/2 15 20
15/64 or 3/8 5/8 or 3/4 15 50
15/32 3/4 or 7/8 30 120
5/8 1 or 1 1/4 60 120
3/4 - 250 250
55/64 - 350 350
3 6
Cooling only(g/m)
Cooling
capacity
Max lenght
of connection
pipe(m)
Max height
difference
(m)
9000Btu/h
(2637W)
15 5
12000Btu/h
(3516W)
20 10
18000Btu/h
(5274W)
25 10