-
58
-
Equivalent piping length
(1)
m
7.5
10
15
20
25
30
35
40
45
50
55
Heating
1.0
0.995
0.992
0.990
0.987
0.984
0.981
0.978
0.975
0.972
0.970
151 series
1.0
0.997
0.991
0.985
0.980
0.974
0.968
0.962
0.956
201 series
1.0
0.996
0.989
0.981
0.973
0.966
0.958
0.951
0.943
251 series
1.0
0.995
0.986
0.977
0.967
0.958
0.948
0.939
0.930
301 series
1.0
0.996
0.989
0.982
0.974
0.967
0.959
0.952
0.945
0.937
0.930
401 series
1.0
0.995
0.986
0.976
0.967
0.957
0.948
0.938
0.929
0.919
0.910
501 series
1.0
0.994
0.982
0.969
0.957
0.945
0.933
0.921
0.908
0.896
0.884
601 series
1.0
0.993
0.978
0.963
0.948
0.933
0.918
0.903
0.888
0.873
0.858
(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.
Note
(1) Equivalent piping length can be obtained by calculating as follows.
151, 201 series [
φ
12.7(1/2
″
)]: Equivalent piping length = Real piping (0.20
×
Number or bends in piping)
251, 301, 401, 501, 601, series [
φ
15.88(5/8
″
)]: Equivalent piping length = Real piping (0.25
×
Number of bends in piping)
[Equivalent piping length < Limitation length of 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
5m
10m
15m
20m
25m
30m
Adjustment coefficient
0.01
0.02
0.03
0.04
0.05
0.06
Piping length limitations
Item
Model
151, 201, 251 models
301~601 models
Max. one way piping length
40m
50m
Max. vertical height difference
Outdoor unit is higher 30m Outdoor unit is lower 15m
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model FDTA301HEN 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 =
7200
×
1.00
×
(0.989 - 0.01)
×
1.0
=
7049 w
Factor by air
temperatures
FDTA301HEN
Air flow
“High”
Length 15m.
Height difference 5 m
Cooling
(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
Item
Hi
0.056
0.063
0.043
Air flow
Me
0.041
0.048
0.034
Lo
0.028
0.034
0.025
Model
FDKNA151, 201
FDKNA251
FDKNA301
Model FDKN type
Item
Hi
0.111
0.053
0.069
0.106
0.050
Air flow
Lo
0.083
0.037
0.049
0.079
0.034
Model
FDUR201
FDUR251
FDUR301
FDUR401
FDUR501, 601
Model FDUR type
Note
(1) Values in the table indicate
the one way piping length
between the indoor and
outdoor units.
