Taco 6 zone switching relay for circulators went on fire! Burnt like Chief Mike's Thanksgiving Day Turkey! If you need a new Taco SR506 switching relay, click here: amzn.to/3p4tInq
I learned a lot from these videos. PM is most important and now I change the filter monthly. What a difference! No more dust in the house and the furnace runs very well. I also got a maintenance contract for my air and heat system.
@@PipeDoctor i can not belive you reconnected those wires to the circulators with melted, degraded and deformed insulation, thats a fire waiting to happen, those wires are 120v, that could start arching and not blow any fuses.
@@PipeDoctor i did, and not trying to troll, 8:03 is the final installation? that is the wires i was talking about, they look black and deformed to me, maybe it just looks like that on the video and they are fine.
Lose neutral or line side on the power feed to relay that’s why it first into flames, It was probably arcing out for quite some time, make sure your electrical connections are always tight especially on the power feed especially on a neutrals Happens in circuit breaker panels all the time to
Yes I agree. The source of the fire looks to be the lower right corner which is the 120v power inlet. All the loads are fuse protected (around 5A, I believe) so a shorted circulator isn't likely. Unfortunately, this may have been caused by an install error from a loose screw connection or a connection tightened too much the solder connection cracked. Also the wire stresses the terminals because Taco didnt include enough room to loop the wires correctly (especially 12 ga wire). Either way, the arcing caused carbon tracking which became more and more conductive until the fire. I never saw one that bad!!
Nice of the boiler mfgr to not quite give you room to swing the gas valve around without cracking open the sheet metal. Finding bad switching relay and gas valve together is pointing toward a power surge or abnormal power line voltage due to bad neutral connection at the service or bad pole transformer.
Looking at the wiring condition at the beginning of the video - it is apparent that the ignition source was right where the BX entered the Taco cabinet. Perhaps the red anti-short in the cable failed due to a sharp edge on the cable itself. Was there an anti-short in the cable?
Checking motors with an ohmmeter is kinda dubious. A one-turn short will not show up on an ohmmeter but the motor is junk. Maybe use something more definitive, like a series test lamp?
Let Taco know you mounted the switching relay on the boiler jacket. Taco does make flow controls too; in case the homeowner is getting heat where he doesn’t want it.
@@PipeDoctor Seems like a SPD or at least fusing the thing, or maybe a thermal fuse, would be a good go-to in the future given how many folks have had similar issues...or just different product lol
@@PipeDoctor I heard a story about boiler aquastat dying, got replaced. Then that one died again few days later. Called power company, they found a bad intermittent Line on transformer or something.
Why would you say that I installed relays all the time on boiler jackets and seen hundreds installed that way. I’m not arguing with you just would like to know you’re reason.
I just say that because eletrical parts like to be warm in the winter and cool in the summer, if you install them on the side of the it of course very very hot and it potentiallyiver time causes things to over heat, I have seen never had one get on fire when they are kept in cool place off the boiler I have only every seen catch on fire when when they are too hot and on the side wall of the boiler I'm am just speaking on my service experiences
