Ferroli RFA - Available Static Head of the Return Air Fan; Pressure Drops to be Added Due to Condensate Generation on the Internal Coil

23
TECHNICAL DATA AND PERFORMANCES
The graphs are referred to units operating with air at the temperature of 20°C (density 1,20 kg/m
3
).
Available static head of the return air fan
When the return air fan is present, verify that the available head, corresponding to an air ow rate equal to the 70% of the air ow
rate dened for the internal fan, is not higher than the pressure drops in the return duct.
If necessary modify the fan speed in order to reduce the available head.
In such way it is possible to guarantee a correct air extraction, keeping a little over pressure in the room to be conditioned also
when the unit is working with all external air.
Air flow rate [ m
3
/h ]
Available static head [ Pa ]
0
50
100
150
200
250
300
350
400
450
500
4000 8000 12000 16000 20000 24000 28000 32000 36000 40000
35.1
45.1
55.1
70.2
90.2
110.2
140.2
180.2
220.2
0
10
20
30
40
5000 10000 15000 20000 25000 30000 35000 40000
Pressure drops to be added due to condensate generation on the internal coil
Air flow rate [ m
3
/h ]
Pressure drops [ Pa ]
35.1 45.1 55.1 70.2 90.2 110.2 140.2 180.2 220.2