INNOV@ ECFAN DHR -AGU-0912-E • 23 •
Fig. 15 Purging the air out of the water coil (CW version)
9.3 Set the right fan speed
The adopted fans are of the backward curved blades type in combination with a 4 poles e-motor. This kind of fan
has very high performances so that it’s speed has to be reduced in order to match to the nominal air flow with the
real external pressure drops: in case of wrong selection, the air flow may exceed the limits with possible water
dragging out from the coils (down flow units) or in case of DC units. a not sufficient airflow can cause ice on the
coil.
The relief valve is accessible in the units from front of the machines.
See the details in the following pictures.
Unit performance @ full
speed
Unit performance @
intermediate speed
Unit performance @ low
speed
Nominal Air
flow
Air flow over
the limits
DP (Pa)
Air flow
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