'19 • PAC-DB-333
- 46 -
Equivalent piping length (m)
9.2 Correction of cooling and heating capacity in relation to air flow rate control
(Fan speed)
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.
Cooling
1.00
0.95
Fan speed
Coefficient
Hi
P-Hi
0.93
0.90
Heating
1.00
0.97
0.96
0.94
Lo
Me
30
0.92
15
20
25
0.97
0.96
0.94
7.5
10
1
1
0.99
1
1
1
1
1
Cooling
Heating
Piping length limitations
Model
Item
All models
Max. one way piping length
30m
Max. vertical height difference
Outdoor unit is higher 20m
Outdoor unit is lower 20m
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
Net cooling capacity =
9.0
×
1.00
×
0.97
×
0.99
8.6 kW
Example : The net cooling capacity of the model FDT90VNPWVH with the air flow “P-Hi”, the piping length of 15m, the outdoor
unit located 5m lower than the indoor unit, indoor wet-bulb temperature at 19.0
℃
and outdoor dry-bulb temperature 35
℃
is
Net cooling total capacity
of FDT90VNPWVH
(Outdoor temp. : 35
℃
DB
Indoor temp. : 19
℃
WB)
shown in table 9.1
Air flow : P-Hi
shown in table 9.2
Piping length : 15m
(Gas pipe size is
φ
15.88)
shown in table 9.3
Height difference : 5m
(Outdoor unit : below)
shown in table 9.4
5m
10m
15m
20m
0.99
098
0.97
0.96
When the outdoor unit is located below indoor units in cooling mode, or when the outdoor unit is located above indoor units in
heating mode, the correction coefficient mentioned in the below table should be subtracted from the value in the above table.
Height difference between the indoor unit and
outdoor unit in the vertical height difference
9.4 Height difference between the indoor unit and outdoor unit
Adjustment coefficient
