Daikin F Series Technical Manual page 16

Application Information
4) Refrigerant Piping
When the pipe length becomes too long, both the capacity and reliability drop. As the number of bends
increase, resistance to flow of refrigerant system increases, thus lowering cooling capacity and as a result
the compressor may become defective. Always choose the shortest path and follow the recommendation as
tabulated below:
Indoor
Model
Outdoor
Max. allowable length, m
Max. allowable elevation, m
Liquid pipe size, mm / in
Gas pipe size, mm / in
Indoor
Model
Outdoor
Max. allowable length, m
Max. allowable elevation, m
Liquid pipe size, mm / in
Gas pipe size, mm / in
Indoor
Model
Outdoor
Max. allowable length, m
Max. allowable elevation, m
Liquid pipe size, mm / in
Gas pipe size, mm / in
5) Additional Charge
• The refrigerant charge has already charged into the outdoor unit. For the piping length of 7.5m, additional
refrigerant charge after vacuuming is not necessary.
• When the piping length is more than 7.5m, please use the table below (unit in gram).
Cooling Only
Indoor
Outdoor
Add. Charge, g/m
Indoor
Outdoor
Add. Charge, g/m
Indoor
Outdoor
Add. Charge, g/m
Example: FCN25FV1 & RN25CV1 with 13m piping length, additional piping length is 5.5m. Thus,
Additional Charge = 5.5m x 10 g/m
= 55g
14
FFN10CV1
RN10FV1
20
10
6.35 / 1/4"
9.52 / 3/8"
FCN25FV1
RN25CV1
30
15
6.35 / 1/4"
15.88 / 5/8"
FCN35FV1
RN35DV1
50
30
9.52 / 3/8"
15.88 / 5/8"
FFN10CV1 FFN15CV1
RN10FV1 RN15FV1
18
FCN25FV1
RN25CV1 RN28CV1
10
FCN35FV1 FCN40FV1
RN35DV1 RN40DY1
27
FFN15CV1
RN15FV1
20
10
6.35 / 1/4"
12.70 / 1/2"
RN28CV1
25
8
9.52 / 3/8"
15.88 / 5/8"
FCN40FV1
RN40DY1
50
30
9.52 / 3/8"
15.88 / 5/8"
FCN20FV1
RN20CV1
18 22
FCN30FV1
RN30CV1
24 24
FCN50FV1
RN50DY1
24 24
FCN20FV1
RN20CV1
30
15
6.35 / 1/4"
12.70 / 1/2"
FCN30FV1
RN30CV1
45
25
9.52 / 3/8"
15.88 / 5/8"
FCN50FV1
RN50DY1
50
30
9.52 / 3/8"
15.88 / 5/8"