Title:
METHOD FOR DETECTING CLOGGING OF FILTER
Document Type and Number:
Japanese Patent JP2511219
Kind Code:
B2
Abstract:
PURPOSE: To certainly detect the clogging of a filter in order to inform the user of the clogging of the filter.
CONSTITUTION: A speed detection circuit 94b detecting the rotational peed of a convection fan 52 and a current supply control circuit 94e controlling the value of the current supplied to a fan motor 51 so that the rotational speed of the convection fan 52 becomes the objective speed determined by an objective speed determining circuit 94c are provided and, when the value of the current supplied to the fan motor 51 is reduced to a predetermined current value or less from a fundamental current value by a definite current value, the filter is judged to be in a clogging state.
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Inventors:
YASUI SHIGEAKI
Application Number:
JP32575791A
Publication Date:
June 26, 1996
Filing Date:
December 10, 1991
Export Citation:
Assignee:
RINNAI KK
International Classes:
B01D46/42; F24B1/187; F24C1/00; F24F11/04; (IPC1-7): B01D46/42; F24B1/187; F24C1/00; F24F11/04
Domestic Patent References:
| JP245120U | ||||
| JP6164010U | ||||
| JP5610220U |
Attorney, Agent or Firm:
Kenji Ishiguro