Friedrich FSHSW09A1A Installation And Operation Manual page 36

Configuration of connection pipe
1. Standard length of connection pipe
● 15ft, 22.5ft,24ft
2.Min. length of connection pipe is 9Ft.
3.Max. length of connection pipe.
Max. length of connection pipe
Cooling
capacity
5000Btu/h
7000Btu/h
9000Btu/h
12000Btu/h
18000Btu/h
4. Additional refrigerant may be required when extending the line-set.
● After the line-set has been extended 33ft past standard length of 25ft,
adding additional 5ml of refrigerant oil for each additional 16ft.
● The calculation method of additional refrigerant charging amount (on the basis
of liquid pipe):
Additional refrigerant charge amount = extended length of liquid line x
required additional amount per foot.
● Basing on the length of standard pipe, add refrigerant according to the
requirement as shown in the table. The additional refrigerant charging amount
per foot is different according to the diameter of liquid pipe. See the
following sheet.
Max. length
of connec-
tion pipe
45
45
45
60
75
31
Unit: ft
Max. length
Cooling
of connec-
capacity
tion pipe
24000Btu/h
28000Btu/h
36000Btu/h
42000Btu/h
48000Btu/h
75
90
90
90
90