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UNI 3 User Manual
10 Maintenance Table
Component Action Interval
Filters Filters must be replaced at least once a year. It is recommended to change them twice a year,
before and after the pollen season. Check that the filter seal is completely tight.
6-12
months
Fans Fans must be cleaned at least once a year to maintain fan efficiency. 12 months
Rotor Check that the surfaces are clean. Check that the sealing strips face in towards the rotary
wheel-type heat exchanger. Check that the rotor belt is whole and not too slack.
12 months
Kitchen hood* Wash the grease filter. Check that the damper is clean and closes fully. 2 weeks
Seals Check that the seals in the unit are intact. 12 months
Valves To be cleaned at least once a year. 12 months
Air intake Check that no leaves or other items have caught in the grille.
In frost mist periods during winter the air intake can freeze up. If necessary it must be scraped
clean so that the air can pass through.
12 months
Roof cowl If the unit has a roof cowl, this must be checked for leaves and the like. Also check that the
drain slots are open.
12 months
Ducts Check that the ducts are clean. 10 years
Brush strips Check that the brush strips are whole and sit tightly against the rotor. If they are worn they
can be moved to the next groove in the profile, so that they are closer to the rotor.
3 years
Inside unit A combination of a very low outside temperature and damp extract air can lead to the
formation of ice. Normally this will not be a problem - when normal operating conditions
return the ice crystals will be converted to damp and be removed from the unit via the
exhaust air. In the case of extreme cold over longer periods the unit should be checked for
ice.
*For units with extract air from the kitchen hood connected to the unit.
11 Troubleshooting
Type of fault Remedial action
Cold draughts Check which supply temperature has been selected. See operating panel.
Check that the rotor is rotating.
Check that heating comes on.
Needs new extract filter.
Fans not working Check that the power to the unit is connected.
Check that the thermostat has not cut out.
Reset by pressing the button. Must also be reset on the automatic panel.
Low air volume Check the speed the unit is set to.
Check that the filters are tight.
Check the intake grille.
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