| 摘要 |
PROBLEM TO BE SOLVED: To control a gas appliance, according to the kind of changed gas, even if a user does not attach an electronic part having a constant not to be changed to a small board in advance, at the time of mounting of the small board for the change of gas kind. SOLUTION: This control board is provided with a connector 7c for detection in which voltage is applied by microcomputer control, and a microcomputer judges that the connection between the small board 9 and a main board is sure if the detected voltage applied to the connector 7c for detection is under the threshold voltage, and further this control board is equipped with a means which controls a gas apparatus with the constant of the small board 9 and the constant stored in the memory of the microcomputer.
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