Specifications

427
FDEN-H
5m 10m 15m 20m 25m 30m
0.01 0.02 0.03 0.04 0.05 0.06
Item
Model
FDENP308, 408, 508 type
Max. one way piping length 30m 50m
Max. vertical height difference
20m (Outdoor unit is higher ) 30m (Outdoor unit is higher )
(3) Correction of cooling and heating capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling and heating capacity in relation to the one way equivalent piping length between the indoor
and outdoor units.
Equivalent piping length
(1)
m 5 10152025303540455055
Heating 1.0 1.0 1.0 1.0 1.0 0.995 0.995 0.99 0.99 0.985 0.985
1.0 0.995 
1.0 0.995 0.99 0.985 0.98 0.975 0.97 
FDENP308 type 1.0 0.99
FDENP408 type 1.0
FDENP508 type 1.0
Cooling
Piping length limitations
How to obtain the cooling capacity
Factor by air
temperatures
FDENP308HEN-S Air flow
“High”
Length 15m.
Height difference 5 m
0.995 0.99 0.985 0.985 0.98
0.98 0.97 0.96 0.95 0.94 0.93 0.92 0.91 0.9
0.995 0.985 0.98 0.97 0.965 0.955 0.95 0.94 0.935 0.925
0.99 0.975 0.965 0.95 0.94 0.925 0.915 0.9 0.89 0.875
15m (Outdoor unit is lower ) 15m (Outdoor unit is lower)
(2) Correction of cooling and heating capacity in relation to air flow rate control (fan speed)
Coefficient: 1.00 at High, 0.95 at Low
Air flow
Hi 0.031 0.030 0.036 0.018
Lo 0.016 0.013 0.018 0.010
FDEN208 type
FDENP
208 type
FDEN258 type
FDENP258 type
(4) When the outdoor unit is located at a lower height than the indoor unit in cooling operation and when the
outdoor unit is located at a higher height than the indoor unit in heating operation, the following values should
be subtracted from the values in the above table.
Note (1) Equivalent piping length can be obtained by calculating as follows.
208, 258, 308 series [ø15.88(5/8")]: Equivalent piping length = Real piping length + (0.10 × Number or bends in piping)
408, 508, series [ø19.05(3/4")]: Equivalent piping length = Real piping length + (0.15 × Number of bends in piping)
[Equivalent piping length < Limitation length of piping + 5m]
Height difference between the indoor unit and
outdoor unit in the vertical heigh sifference
Note(1) Values in the table indicate the one way piping length between the indoor and outdoor units.
Adjustment coefficient
The net cooling capacity of the model FDENP308HEN-S with the air flow “High”, the piping length of 15m, the outdoor unit
located 5m lower than the indoor unit, indoor wet-bulb temperature at 19.0 ˚C and outdoor dry-bulb temperature 35 ˚C is
Example:
Net cooling capacity = 7100 × 1.00 × (0.98 - 0.01) × 1.0 = 6887 w
Table of bypass factor
Item
Model
FDEN (P) 208 type FDEN (P) 258 type FDENP308 type FDENP408,508 type
FDEN208, 258 type
FDENP208, 258 type