INNOV@ ECFAN DMR -AGU-0912-E • 17 •
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).
In the EC fans the rotation speeds are selected with different values of the control tension (0 - 10V). If in the unit is
present the advanced control the right value of the control tension is set by the keyboard present in the advanced
control. With the basic control the control tension is set with a manual potential installed in the E-Panel. To know the
tension set with the potential it is necessary to use an external tool (Voltmeter).
The relief valve is accessible in the units
from front of the machines
External pressure
drops
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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