Vents DVUT 300 P1B EC, User Manual

21

www.ventilation-system.com

2. Heat exchanger maintenance (once per year).

Some dust may accumulate on the heat exchanger even in case of regular maintenance of the filters. Regular cleaning of the heat 
exchanger is required to maintain high heat recovery efficiency. To clean the heat exchanger pull it out of the unit and clean it with 
compressed air or a vacuum cleaner.  After cleaning install the heat exchanger back in the unit.
Steps for removal of the heat exchanger:
1. Disconnect the unit from power supply.
2. Open the service door using the key.
3. Detach the hose from the drain pan. 
4. Remove the screws retaining the drain pan and pull it downwards. 
5. Loosen the hand screws to release the heat exchanger. 
6. Pull the heat exchanger to remove.
7. After completion of maintenance install the heat exchanger in the reverse order.

3. Fan maintenance (once a 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 compressed air. Do not use water, aggressive solvents or sharp objects as they may damage the 
impeller.

4. Maintenance of air intake devices (twice per year).

The supply grille may get clogged with leaves and other objects, which reduces the unit performance and supply air delivery. Check the 
supply grille twice per year and clean it as required.

5. Air duct system maintenance (every 5 years).

Even regular fulfilling of all the maintenance operations described above may not completely prevent dust accumulation in the air ducts, 
which reduces the unit performance. Duct maintenance means regular cleaning or replacement.

6. Control unit maintenance (as required).

The control unit is located inside of the unit casing. For accessing the control unit remove the fixing screws on the panel and remove the 
control unit lid.