Page 23
Operation and Maintenance Instructions
THE NEW EcoHeater
DSEH180401.00.EN
Continuous product development may give rise to specification changes without notice.
5.3 Fan unit (code ENF)
The function of the fan is to transport
air through the system, i.e. the fan
must overcome the flow resistance
in air terminals, air registers, air
ducts and the unit.
The fan speed is regulated to
provide correct air flow. If the
fan generates a lower air flow,
this will impair the function of the
ventilation system.
•
If the extract air flow is
too low, the ventilation
capacity will be
unsatisfactory. Imbalance
may also force moist
air out into the building
structure.
One reason for why the fans generate too little air flow may be that impurities
have collected on the fan impeller blades.
•
If a centrifugal fan is rotating in the wrong direction, the air flow will still go
the right way, but with a considerable reduction in capacity. Check the direc-
tion of rotation.
WARNING!
High voltage and rotating fan impeller, risk of personal injury.
Before working on/servicing the unit
–
shut down the unit via
the control terminal, then turn the safety switch to the 0 position
and lock it.
WARNING!
Rotating fan impeller, risk of personal injury. Shut down the air
handling unit and wait at least 3 minutes before you open the
inspection doors.
Fan unit
1. EC motor with
control unit
2. Fan impeller
3. Anti-vibration mounting
3
1
2
