Daikin FTXN25LV1B Manuel D'installation page 12

Allowable Piping Length
If the pipe is too long, both the capacity and reliability of the unit will drop. As the number of bends increases, resistance
to the fl ow of refrigerant system increases, thus lowering cooling capacity. As a result, the compressor may become
defective. Always choose the shortest path and follow the recommendations 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)
*Be sure to add the proper amount of additional refrigerant. Failure to do so may result in reduced performance.
Remark: The refrigerant pre-charged in the outdoor unit is for piping length up to 7.5m.
Additional Charge
The refrigerant is pre-charged in the outdoor unit. If the piping length is less than 7.5m, then additional charge after
vacuuming is not necessary. If the piping length is more than 7.5m, then use the additional charge value as indicated
in the table.
Additional refrigerant charge [g] per additional 1m length as tabulated
Indoor
Outdoor
Additional charge [g/m]
Example:
FTXN25LV1B & RXN25LV1B with 12m piping length, additional piping length is 4.5m. Thus,
Additional charge = 4.5[m] x 20[g/m]
= 90.0[g]
REFRIGERANT PIPING
FTXN25LV1B FTXN35LV1B
3
20
10
9.52 (3/8")
6.35 (1/4")
FTXN25LV1B FTXN35LV1B
RXN25LV1B RXN35LV1B
20 20
1-10
FTXN50LV1B FTXN60LV1B
3
30
10
12.70 (1/2'') 15.88 (5/8'')
6.35 (1/4")
FTXN50LV1B FTXN60LV1B
RXN50LV1B RXN60LV1B
20 20