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Keeping a used circulator for a spare
I learned last winter that when circulators sit on the shelf after they have been used the seize. Had a slightly used 007 as a spare and took it to replace a bad injection circulator for my brother in law on a Sunday when it was below zero (of course). Found my used circulator (I was not charging him for this) to be stuck. I installed a new one off the truck. The cartridge was stuck and I ended up breaking the impeller trying to free it.
So I got to looking at a 0010 I removed last year from a boiler change over which was less than a year old. It too was seized. Removed the cartridge and boiled it with the impeller up just to see what would happen. It is now free and spins like new.
Is there anything one could do to preserve these cartridges from seizing when they dry out? Could they just be left in a Tupperware submerged in water?
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