Refrigerant Piping; Additional Charge - Daikin FT-J series Technical Manual

Application Information

Refrigerant Piping

Piping Length and Elevation
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends increases,
system piping resistance to the refrigerant fl ow increases, thus lowering the cooling capacity, and as the result
the compressor may become defective. Always choose the shortest path and follow the recommendation as
tabulated below:
Cooling Only Model
Indoor
Model
Outdoor
Min. Allowable Length (L), m
Max. Allowable Length (L), m
Max. Allowable Elevation (E), m
Gas Pipe Size, mm/(in)
Liquid Pipe Size, mm/(in)
Heatpump Model
Indoor
Model
Outdoor
Min. Allowable Length (L), m
Max. Allowable Length (L), m
Max. Allowable Elevation (E), m
Gas Pipe Size, mm/(in)
Liquid Pipe Size, mm/(in)

Additional Charge

• The refrigerant gas is charged in the outdoor unit and, if the piping length is 7.6m, additional charge of the
refrigerant after vacuuming is not necessary.
• When the piping length is more than 7.6m, additional refrigerant charge (g) per additional 1m length as
tabulated:
R22 – Cooling Only
Indoor FT10JXV1 FT15JXV1 FT20JXV1 FT25JXV1
Outdoor R09CXV1
Add. Charge, g/m
R22 – Heatpump
Indoor FTY09JXV1 FTY15JXV1 FTY20JXV1 FTY25JXV1
Outdoor RY09CXV1 RY15CXV1 RY20CXV1 RY25CXV1 RY28CXV1 RY30DXV1
Add. Charge, g/m
13
Indoor Unit
Outdoor Unit
FT10JXV1 FT15JXV1 FT20JXV1 FT25JXV1
R09CXV1 R15CXV1
12 12
5 5
9.52 / (3/8") 12.70 / (1/2") 15.88 / (5/8") 15.88 / (5/8") 15.88 / (5/8")
6.35 / (1/4") 6.35 / (1/4") 6.35 / (1/4") 9.52 / (3/8") 9.52 / (3/8")
FTY09JXV1 FTY15JXV1 FTY20JXV1 FTY25JXV1
RY09CXV1 RY15CXV1 RY20CXV1 RY25CXV1 RY28CXV1 R30DXV1
12 12
5 5
9.52 / (3/8") 12.70 / (1/2") 15.88 / (5/8") 15.88 / (5/8") 15.88 / (5/8") 15.88 / (5/8")
6.35 / (1/4") 6.35 / (1/4") 6.35 / (1/4") 9.52 / (3/8") 9.52 / (3/8") 9.52 / (3/8")
R15CXV1 R18CXV1
20 20
20 20
L
R18CXV1 R25CXV1
3
25 35
15 20
3
15 15
8 8
R25CXV1 R28CXV1
19 39
20 55
H
FT30FXV1
R28CXV1 R30DXV1
15 45
8 15
15.88 / (5/8")
9.52 / (3/8")
FTY30FXV1
15 45
8 15
FT30FXV1
R30DXV1 R30DXY1
55 55
FTY30FXV1
58 55
R30DXY1
55