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Press the respective speed button (low, medium or high speed, fig. 19) to turn the kitchen
hood on. The kitchen hood has priority over the control panel, i.e. the control panel is not active when
the kitchen hood is on.
Press the respective button to turn the kitchen hood off, see fig. 19. After turning the
kitchen hood off the unit reverts to the operation mode set from the control panel.
The kitchen hood is controlled with the buttons located on the front panel, fig. 16. If the kitchen
hood is in operation, the heat recovery function is not engaged because extract air flows passes by
the heat exchanger. The unit operates at the speed set by the kitchen hood.
The unit requires maintenance works 3-4 times per year.
Maintenance includes regular cleaning and the following operations:
1. Filter maintenance (3-4 timed per year).
Dirty filters increase air resistance in the system and reduce supply air volume. The filters require
cleaning as they get clogged, but at least once in 3-4 months.
Vacuum cleaning is allowed. Replace the filters as they get clogged following the second cleaning.
Contact your local manufacturer representative for new filters.
To remove the filters follow the procedure in the fig. 20:
1. Remove the screws.
2. Open the unit access door and disconnect the control panel plug connector (only for the model
with a built-in control panel), then unscrew 2 M6 screws to release the stopper. Open the unit access
door and lift it upwards to remove it from the supports.
3. Remove the heat exchanger from the unit by pulling its band.
4. Take the supply and extract filter off.
2. Kitchen hood fat filter maintenance (only for the units VUT 300 (301) EVK mini EC (as
required).
To clean the metal fat filters let them soak in hot water mild detergent solution until the fat gets
dissolved.
To release the fat filters follow the procedure in fig. 22:
1. Press the latch.
2. Move the fat filter carefully down and release it.
3. Heat exchanger inspection (once per year).
Some dust can get accumulated on the heat exchanger block even in case of regular maintenance
of the filters.
To maintain the high heat exchange efficiency, regular cleaning is required.
To clean the heat exchanger pull it out of the unit and flush it with warm soap or mild detergent
water solution. Re-install the dry heat exchanger to the unit.
4. Fan inspection (once per year).
Even in case of regular filter and heat exchanger maintenance, some dust and grease can get
accumulated inside the fans and reduce the fan performance and supply air flow.
Clean the fans with a soft brush or cloth. No water and abrasive detergent, sharp objects or solvents
are allowed for cleaning to prevent the impeller damage.
5. Condensate drainage (once per year).
The drain pipes may get clogged with extracted particles.
Pour some water inside the drain pan and check the pipe for clogging. Clean the U-trap and drain
pipe if required.
6. Supply air flow control (twice per year).
Leaves and other pollutions can clog the supply air grille and reduce the unit performance and
supply air volume.
Check the supply grille twice per year and clean it as required.
MAINTENANCE
19
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