Daikin FTXS-A Series Technical Manual page 13

Cable Size
Model
Power supply cable size
Number of wire
Interconnection cable size
Number of wire
Recommended fuse
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 flow 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:
Model
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 7.5m, additional charge of the
refrigerant after vacuuming is not necessary.
• When the piping length is more than 7.5m, additional refrigerant charge (g) per additional 1m length as
tabulated:
Model
Additional charge [g/m]
Example:
FTXS25 & RXN25 with 12m piping length, additional piping length is 4.5m.
Thus, Additional charge = 4.5[m] x 20[g/m]
FTXS25A
Unit
RXN25F
mm
2
mm
2
A
Indoor Unit
Outdoor Unit
FTXS25A
RXN25F
FTXS25A
RXN25F
= 90.0[g]
FTXS35A
RXN35F
1.5
3
1.5
4
16
L E
FTXS35A
RXN35F
3
20
10
9.52 (3/8")
6.35 (1/4")
FTXS35A
RXN35F
20
Application Information
FTXS50A FTXS60A
RXN50C RXN60C
2.5
3
2.5
4
20
FTXS50A FTXS60A
RXN50C RXN60C
3
30
10
12.70 (1/2") 15.88 (5/8")
6.35 (1/4")
FTXS50A FTXS60A
RXN50C RXN60C
9