706
V MULTI
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 0.99 0.975 0.965 0.95 0.94 0.925 0.915 0.9 0.89 0.875
1.0 0.99 0.98 0.97 0.96 0.95 0.94 0.93 0.92 0.91 0.9
(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.
508 series [φ19.05 (3/4″)] : Equivalent piping length = Real piping length + (0.15 × Number of bends in piping)
808 series [φ25.4 (1″)] : Equivalent piping length = Real piping length + (0.15 × Number of bends in piping)
1008 series [φ28.58 (1 1/8″)] : Equivalent piping length = Real piping length + (0.20 × 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.
Cooling
FDC508 type
FDC808, 1008 type
Item
Model
All models
Max. one way piping length 50m
Max. vertical height difference
Outdoor unit is higher 30m
Outdoor unit is lower 15m
Note (1) Values in the table indicate the one way piping length between the indoor and outdoor units.
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
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model FDC808HES3 with the air flow “High”, the piping length of 40m, 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 = 20000 × 1.00 × (0.93 - 0.01) × 1.0 = 18400 w
Factor by air
temperatures
FDC808HES3
Air flow
“High”
Length m.
Height difference 5 m
Item
Air flow
Hi 0.112 0.050 0.065 0.076 0.025
Lo 0.073 0.030 0.030 0.050 0.013
Model
208 type 258 type 308 type 408 type 508 type
(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
Table of bypass factor
FDT series
FDR series
Item
Air flow
Hi 0.035 0.035 0.039 0.085 0.035
Lo 0.021 0.020 0.023 0.060 0.023
Model
208 type 258 type 308 type 408 type 508 type
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