Ventis twinfresh solar SA-60, Руководство пользователя

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Even regular technical maintenance may not completely prevent dirt
accumulation on the regenerator assemblies.
Subject the regenerator to regular cleaning to ensure its high heat
recovery efficiency.
Clean the regenerator with a vacuum cleaner at least once in a year.
3. Ventilation hood maintenance (once per year).
The ventilation hood may get clogged with leaves and other objects which impairs the unit performance.
Check the ventilation hood twice per year and clean it as often as required.
To clean the ventilation hood disassemble it, then clean the ventilation hood and the air duct.
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4. Solar panel maintenance.
Keep the solar panel clean and remove regularly any
contaminations to ensure its high performance. Do not scratch and
do not damage the solar cells as it impairs the ventilator efficiency.
Perform preventive maintenance operations 4 times per year or
more often, depending on the environmental conditions. The solar
cells must not be in shadows. Remove tree branches with care not
to damage the equipment.