17
Configuration of connection pipe
1. Min. length of connection pipe is 3m.
2. Max. length of connection pipe and max. height difference.
3. The additional refrigerant oil and refrigerant charging required after lengthening
connection pipe
●
The calculation method of additional refrigerant charging amount (on the basis
of liquid pipe):
Additional refrigerant charging amount = extra length of liquid pipe × additional
refrigerant charging amount per meter
●
When the length of connection pipe is above 10m, add refrigerant according to
the extra length of liquid pipe. 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
Cooling
capacity
Max length
of connec-
tion pipe
Max height
difference
25 class
9000Btu/h
(2637W)
15
10
35 class
12000Btu/h
(3516W)
15
10
50 class
18000Btu/h
(5274W)
25
10
60 class
24000Btu/h
(7032W)
25
10
Diameter of connection pipe
Outdoor unit throttle
Liquid pipe(mm)
Gas pipe(mm)
Cooling only(g/m) Cooling and heating(g/m)
Ø6
Ø9.52 or Ø12
15
20
Ø6 or Ø9.52
Ø16 or Ø19
15
50
Ø12
Ø19 or Ø22.2
30
120
