Vents VUT 180 P5 User Manual page 15

3. Fan maintenance (once per year).
Even in case of regular maintenance of the filters, some dust may accumulate inside the fans and reduce the fan performance and supply
air flow.
Clean the fans with a soft cloth, brush, or using compressed air.
Do not use water, aggressive solvents or sharp objects as they may damage the impeller.
4. Supply air flow control (twice per year).
The supply duct grille may get clogged with leaves and other objects reducing the unit performance and supply air delivery.
Check the supply grille twice per year and clean it as required.
5. Ductwork system maintenance (once in 5 years).
Even regular fulfilling of all the maintenance operations prescribed above may not completely prevent dirt accumulation in the air ducts,
which leads to air pollution and reduces the unit capacity.
Duct maintenance means regular cleaning or replacement.
6. Control unit maintenance (if necessary).
The control unit is positioned inside the unit casing.
To access the control unit, remove the fixing screws on the panel and remove the control unit lid.
Problem
The fan(s) does not start
when the unit is on.
Automatic circuit
breaker tripping
following the unit
turning on.
Low air flow.
Cold supply air.
Noise, vibration.
Water leakage (only in
VUT units).
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POSSIBLE REASONS AND TROUBLESHOOTING
Possible reasons
No power supply.
The motor is jammed, the impeller blades are
clogged.
Alarm in the system.
Overcurrent as a result of short circuit in the electric
circuit.
Low set fan speed.
The filters and the fans are clogged, the heat
exchanger is clogged.
Ventilation system elements (air ducts, diffusers,
louver shutters, grilles) are clogged, damaged, or
closed.
The extract filter is soiled.
The impeller(s) is soiled.
The fan or casing screw connection is loose.
No anti-vibration connectors on air duct pipe
flanges.
Fan out of order.
The drainage system is soiled, damaged, or installed
incorrectly.
Troubleshooting
Make sure the power supply line is connected correctly,
otherwise troubleshoot the connection error.
Turn the unit off. Troubleshoot the motor jam and the
impeller clogging. Clean the blades. Restart the unit.
Turn the unit off. Contact the Seller.
Turn the unit off. Contact the Seller.
Set higher speed.
Clean or replace the filters, clean the fans and the heat
exchanger.
Clean or replace the ventilation system elements, such
as air ducts, diffusers, louvre shutters, grilles.
Clean or replace the extract filter.
Clean the impeller(s).
Tighten the screw connection of the fans or the casing
all the way.
Install anti-vibration connectors.
Turn the unit off. Contact the Seller.
Clean the drain line if necessary. Check the drain line
slope angle. Make sure that the U-trap is filled with
water and the drain pipes are frost protected.
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