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FDTN-H
(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
Heating
FDTN, FDT208 type
FDTN, FDT258 type
FDTN, FDT308 type
(FDC308 type)
FDTN, FDT408 type
(FDC408 type)
FDTN, FDT508 type
(FDC508 type)
FDTN, FDT308 type
(FDC306 type)
FDTN, FDT408 type
(FDC406 type)
FDTN, FDT508 type
(FDC506 type)
Note (1) Equivalent piping length can be obtained by calculating as follows.
208, 258, 308 series [φ15.88(5/8")]: Equivalent piping length = Real piping length + (0.10 × Number or bends in piping)
408, 508, series [φ19.05(3/4")]: Equivalent piping length = Real piping length + (0.15 × Number of bends in piping)
[Equivalent piping length < Limitation length of piping + 5m]
(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.
Height difference between the indoor unit and
outdoor unit in the vertical height difference
Adjustment coefficient
Piping length limitations
Model
Item
Max. one way piping length
Max. vertical height difference
Note (1) Values in the table indicate the one way piping length between the indoor and outdoor units.
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model FDTN308HEN-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
Net cooling capacity =
230
5
10
15
20
1.0
1.0
1.0
1.0
0.995
0.99
1.0
0.995
/0.99
/0.985
1.0
0.995
0.99
0.985
1.0
0.99
0.98
0.97
1.0
0.995
0.985
0.98
1.0
0.99
0.975
0.965
0.98
0.97
1.0
0.99
/0.975
/0.965
0.995
0.985
0.98
1.0
/0.99
/0.98
/0.97
0.99
0.975
0.965
1.0
/0.985
/0.97
/0.955
FDTN, FDT208, 258
(FDC208, 258 type)
30m
Outdoor unit is higher 20m
Outdoor unit is lower 15m
×
×
7100
1.00
FDTN308HEN-S
Air flow
"High"
25
30
35
1.0
0.995
0.995
0.985
0.985
0.98
/0.98
/0.975
/0.97
0.98
0.975
0.97
0.96
0.95
0.94
0.97
0.965
0.955
0.95
0.94
0.925
0.96
0.95
0.94
/0.95
/0.94
/0.925
0.97
0.965
0.955
/0.96
/0.95
/0.94
0.95
0.94
0.925
/0.94
/0.925
/0.91
5m
10m
15m
0.01
0.02
0.03
FDTN, FDT308~508
(FDC308~508 type)
50m
Outdoor unit is higher 30m
Outdoor unit is lower 15m
×
(0.98 - 0.01)
1.0
Length 15m.
Height difference 5 m
50/60Hz
40
45
50
55
0.99
0.99
0.985
0.985
0.93
0.92
0.91
0.9
0.95
0.94
0.935
0.925
0.915
0.9
0.89
0.875
20m
25m
30m
0.04
0.05
0.06
FDTN, FDT208~508
(FDC206~506 type)
30m
15m
=
6887 w
Factor by air
temperatures
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