Water heaters electronic ignition circuit

Electronic ignition circuit for the water heater is shown. When you open the faucet, switch K 3V battery, since the charging C2 need room, so VT6 is off, the power supply while
Water heaters electronic ignition circuit - schematic

the C3, charging so VT7, VT8 conduction, so that the gas supply (gas) solenoid valve BK start winding is energized, the gas valve open, gas began.

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