20
MAINTENANCE
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.
Contaminated fi lters increase air resistance thus impairing supply air delivery into the premises. The fi lters should be cleaned as they get
dirty, but at least 3-4 times a year. Vacuum cleaning for the air fi lters is allowed. For new fi lters contact your Seller.
2. Heat exchanger maintenance.
Even regular technical maintenance of the fi lters may not completely prevent dirt accumulation on the heat exchanger casing. Clean the
heat exchanger on a regular basis to ensure high heat recovery effi
ciency. To clean the heat exchanger remove it from the unit and wash with
warm neutral detergent solution. Re-install the dry heat exchanger into the unit.
3. Fan maintenance (once a year).
Even regular technical maintenance may not completely prevent dirt accumulation in the fans which reduces the fan capacity and
impairs supply air delivery into the premises.
Clean the fans with a soft sloth or a brush. Do not use water, aggressive solvents or sharp objects as they may damage the impeller.
4. Condensate drain check (once a year).
The condensate drain (line) may get clogged by dirt and dust particles contained in the exhaust air. Check the drain line operation by
fi lling the drain pan under the unit with water, clean the U-trap and the drain line, if necessary.
5. Fresh air supply duct check (twice a year).
The supply duct grille may get clogged with leaves and other objects reducing the unit performance and supply air delivery. Check the
supply duct grill twice a year and clean it as required.
6. Duct system check (every 5 years).
Even regular fulfi lling of all the prescribed above maintenance operations may not completely prevent dirt accumulation in the air ducts
which reduces the unit capacity. The air duct maintenance includes their periodic cleaning or replacement.
7. Extract shutters and supply diff user cleaning (as required).
Remove the diff users and louvre shutters and wash those with hot soap water. Do not change the mounting position of the diff users
and the shutters.
7. Emergency Alarms.
On triggering of either the sensor thermal switch deenergizing the heating elements or in case of fi lter clogging (which triggers the
diff erential pressure sensor) or communication line damage the unit enters the emergency «Electric heating elements blowing» mode with
subsequent shutdown in 2 minutes. The red LED goes on, and the control panel displays the message about the malfunction and its origin.
Fault!!!
Heater overheating
Unit OFF
Fault!!!
Filter clogging
Unit OFF
Fault!!!
No communication
Unit OFF
Summary of Contents for VUT 1000 EH
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