Self-locking relay connection diagram for gas boiler

Musa asks:

Good afternoon to you. The third day I am looking for a solution to the problem, help. The question is this, from time to time they turn off the electricity in our city. My aunt has gas heating at home, the boiler is a converted coal stove, gas is supplied, a burner is installed. There used to be an open heating system with cast iron batteries, now closed with bimetal batteries. There is a circulation pump. Pvc pipes. It does not work without a pump because there is no circulation. One night when she was asleep, the lights were turned off and the pump stopped working and the gas burner was gone, since there was no automation. As a result, the water boiled and the pvc pipe burst. An elderly aunt, lives alone. This clap from the pipe rupture scared her very much and now she is afraid to leave the boiler on at night.

I bought her a solenoid valve for gas, installed it on the gas supply pipe and from it to the boiler. Everything works, unplugged from the outlet, it works and shuts off the gas supply, so the flame goes out all right. But when it is plugged into the outlet, it is on and gas is supplied, and the boiler has already gone out and since there is no automation in the boiler, then the gas does not ignite and does not block in the boiler and simply goes into the chimney, which is both dangerous and costly. What now I need, I need some kind of device that will turn off the current supply to the solenoid valve if the electricity in the network suddenly turns off. It is necessary that it manually turn on the current supply to the solenoid valve. Something like a circuit breaker if electricity was lost in it but did not close it when electricity appeared in the circuit, but it was necessary to manually turn it on, such as a light switch. Sorry for the confusion, I cannot formulate the question more precisely.

The question is answered: Alexander Myasoedov

good day

A simple option is to put an undervoltage release on the machine, and connect the valve through a low-power machine.

The tricky option is to find a polarized relay. It is triggered when a voltage of a certain polarity is applied.

There are also such devices as indicating relays, or, as they are also called "Blinkers" - they work and until you return them to their original position with your hands, they do not supply voltage to the circuit.

And finally, the correct and classic option is a relay or self-retaining starter. The actuator for the valve is redundant, but the relay is what you need. For this you need a relay with two groups of normally open contacts with a 220V coil. I am attaching the diagram.

To choose the right one, as an option, you can look at the catalog of the Finder company or any others. If you don't find it with a 220V coil, then take it for 12V, you can even have two car relays connected in parallel, the circuit itself will not change much.

The buttons also need 2 “stop” normally closed (contacts are closed when you don’t press on it), and “start” normally open (like on a doorbell). But in fact, you don't really need a "stop". Only if you just extinguish the boiler, but you can do this with a plug and simply unplug it. If the power of the relay allows, then you can connect the valve together with the pump to it. Look at the current.

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