Maintenance/trouble setting
DVV-Ex XS-XL 23.02.2015
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DANGER
Explosion protection!
Intervention in the fan or in a connected system is allowed only if no pottentially explosive atmosphere
present and if there is no danger to appear it!
WARNING
Hazard from electrical voltage!
Observe at maintenance and service:
•
Impeller must stand still.
•
Electrical circuit must be interrupted and secured against restarting.
•
Observe the rules for safe work.
CAUTION
Danger from hot surfaces!
•
During maintenance and cleaning wear protective gloves!
10.1
Malfunctions and service
The ventilator does not
run
Check connection to the mains and thermal protection. If ok. check electric motor. If
two speed motor (4-6, 6-8, 4-8, 6-12) is installed, check all speed. If necessary get the
electric motor repaired.
Air volume is too low
Check the direction of rotation. If wrong, swap the supply connection of any 2 phases.
Check if current is similar all phases. If ok. check operating point and system design
(too high pressure loss, obstacles in duct).
Thermal protection
switches off
Compare connection with wiring diagram. Compare the data of electric motor with
setting of thermal protection. If ok. check power supply and electric motor (short-
circuit, damage to the bearings, impeller blocked or grinding). Get the electric motor
or if necessary the complete fan repaired.
Overcurrent. Check the direction of rotation. If wrong, swap any 2 phases. Check if
current is similar all phases.
Noise
Damage to the bearings, impeller blocked or grinding. Get the electric motor or if
necessary the complete fan repaired.
Loose fit on the base plate or motor support. Tighten the bolts, look for the cause of
vibrations.
Vibrations
Check operating point and system design. If the actual pressure drop of the system is
higher than supposed, the fan could operate in an unstable area of the fan curve.
Consult customer service of the manufacturer.
Damage or dust layer on impeller.
Clean the impeller, if necessary balance it or replace it.
If the reason for malfunction cannot be clearly determined, consult the customer service of manufacturer.
10.2
Cleaning
Regular cleaning prevents unbalance.
Keep casing clean and clean it if necessary with a brush (do not use a steel brush or high-pressure cleaner). Do
not use any detergents for interior cleaning. Regular cleaning is particularly important, if there are trees in the
neighbourhood. The gap between casing and base plate must be kept free for water drain and may not be cov-
ered by needles or leaves.