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TECHNICAL MAINTENANCE
DISCONNECT THE UNIT FROM POWER MAINS PRIOR TO ANY MAINTENANCE OPERATIONS.
THE CONTROL UNIT MAINTENANCE MUST BE PERFORMED BY AN EXPERT QUALIFIED FOR
UNASSISTED OPERATIONS WITH ELECTRICAL INSTALLATIONS WITH THE VOLTAGE UP TO 1000 V
AFTER CAREFUL READING OF THE USER’S MANUAL.
The unit must undergo technical maintenance 3 to 4 times a year.
Maintenance includes general cleaning of the unit and the following operations:
1. Filter maintenance (3-4 times per year).
Dirty filters increase air resistance in the system and reduce supply air volume.
The filters require replacing not less than 3-4 times per year.
To replace the filters, open the access door on the service panel and remove the dirty filters,
then install new filters and close the access door.
For new filters contact the Seller.
2. Heat exchanger maintenance (once a year).
Some dust may accumulate on the heat exchanger block even in case of regular
maintenance of the filters.
To maintain the high heat exchange efficiency, regular heat exchanger vacuum cleaning
using a crevice nozzle is recommended.
To replace the heat exchanger, open the access door and remove the dirty exchanger from
the unit.
Then install new heat exchanger and close the access door.
For a new heat exchanger contact the Seller.
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 brush or
cloth. Do not use water, aggressive solvents or sharp objects as they may damage the impeller.
4. Technical maintenance of air duct system (every 5 years).
Even regular fulfilling of all the prescribed above maintenance operations may not completely prevent dirt accumulation in the air ducts which
reduces the unit capacity. Duct maintenance means regular cleaning or replacement.
5. Control unit maintenance (if necessary).
The control unit is positioned inside the unit casing. To access the control unit, remove the mounting screws of the service panel of the unit and
take it off.
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