| 摘要 |
PURPOSE:To prevent the operation of a heater when a filter is removed by installing a removable filter to an air intake port of a combustion blower and a switch which operates by mounting the filter near an air intake port and controls a power switch. CONSTITUTION:A filter 20 is fitted into an air intake port 15 of a casing 14, which pushes up a switch lever 24 of a switch 23 so that the switch 23 may be turned into OFF (or ON) state. An electrical signal is transmitted to a power switch of an oil heater from the switch 23 by the change in the operating state as state above. As a result, the power switch is controlled so that is may be operable and the oil heater is adapted to start its operation by turning the power switch ON. Then, when the filter 20 is removed, the switch lever 24 of the switch 23 moves downward so that the switch 23 may turn ON (or OFF). As a result, the power switch operates no more, which prevents the operation of the oil heater even when the power switch is turned on. |
