| 摘要 |
Arrangement (1, 40) for determination of filter condition, or replacement point, for a filter element (2, 1) of an air conditioning system (2) , has an integrator or counter (5) for a pulsed and/or analogue input signal. A comparator unit (6) provides an optical or acoustic warning when the integrator exceeds a predetermined set-point value The condition of the filter is assessed as a function of the ventilation fan accumulated running hours, smoke detection, and air humidity, and may also take account of motion sensor signals and room lighting switch operation.
|
