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:
• Disconnect the unit from power supply.
• Open the service door using the key.
• Remove the 6 screws that retain the upper protective housing and take it off.
• Loosen the hand screws to release the heat exchanger, then pull the heat exchanger to remove.
• 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.
Loosen the hand screws
on the heat exchanger that
retain the heat exchanger.
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.
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