Repair damper relay
Then came the Winter and many owners of independent heating start to start the system. It often happens that start after extended shutdown a very, very difficult. Then there is something wrong, then the idle time gum was dry the oxidized contacts, the hood bird nest platted. By the way, and this happens at the pull of a strong impact and the boiler goes to error.
This time when starting the boiler Signer Duval did not immediately start, but the error is not gone. Neither of which did not highlight, but not even worked in any positions.
Started repair with the inspection of all the parts, everything would have turned out quite serviceable, flow sensors showed the same resistance. The gas pressure was normal (often mesh to become clogged at the entrance and the system doesn`t start due to low gas pressure input). If anyone is interested, I will describe how to check the serviceability of the gas system, but another time. In General, all checked, everything seems to work, but the hood is not included and burns accident.
Reached into the hood and checked the chain of sensors that are tied to the ignition, it turned out that the circuit is the contact resistance. Because in addition to the damper relay that works in conjunction with the hood under normal circuit resistance should tend to zero, then the whole scheme as tends to zero, and then 18 ohms where it came from...
First you should turn on the hood, then the entire system. Went visos air damper and actuates the relay and then everything on the diagram, the boiler starts. Damper relay had to be removed, it is at the top behind the drive drawing in my boiler. Removed, picked up at the terminals of the tester and blew it, the resistance is 18 ohms, what actually was the cause of not proper functioning of the system sensors when switched on.
Decided to buy a new relay, is it in Ukraine 512 UAH, in Russia about 3000 with installation. Scratched turnips and decided to try to wash relays with alcohol, because it showed that oxidized contacts. To disassemble the relay is not possible, so pour the alcohol had a hole vozduhotehnika. Have Ssali 2 CC of alcohol through the hole and Potapov at the ends of the clamps, the tester was talking to this relay and try to wash it off. Chatted about 40 minutes until the resistance was jumping from zero and above. After an hour of this continuous cleaning, the resistance dropped to 2 ohms, which is basically normal. Alcohol to pour from the back of the damper relay will not work, had to wait until it dries itself. After all is dry, relay is put in place and ran the boiler as it should be. Conclusion... don`t immediately run for a new damper relay, if the old resistance above normal, it is simply rinsed with alcohol:)) by the Way, the same relay is on the centrifuge in any washing machine and also sometimes by humidity and oxidized as a result you are just not running the spin cycle:)) This is for the future.
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