| 摘要 |
PROBLEM TO BE SOLVED: To adopt a main microcomputer including the comparatively small number of input terminals for a control device, and thereby to reduce cost of the control device while maintaining performance and functions of a water heater.SOLUTION: A sensor requiring an instantaneous responce out of a plurality of sensors for measuring various parameters for controlling operation of a water heater is connected to a main microcomputer 31, a sensor such as an atmosphere temperature sensor 36 not requiring an instantaneous response is connected only to a sub microcomputer 32 if an analog input terminal of the main microcomputer 31 is not left, and the sub microcomputer 32 converts an analog detection signal of te sensor 36 connected only to the sub microcomputer 32 into digital data and transmits the digital data to a first microcomputer by communication. |
