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Float On This - Conclusion

Yahoo Message Number: 83260
Hi,

Back in late September I dropped my thoughts about replacing a Hydro-Hot tank level switch on the group. Original article is here:

http://www.muniac.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=107#Post107 should anyone want to start from the beginning.

I wanted to experiment with making a replacement float from brass. I started the project but ran into problems with neodymium magnets. They turned out to be too strong and also they lose their magnetism at 175F and above. The heat transfer fluid is at 190F. Any who, I had to source some ALNICO 5 magnets for this project from Digi-Key. The conclusion is one can make a better float assembly from brass, copper and solder. It saves a $150 switch from ending up in the garbage can. It also solves the problem of continuing to replace these switches because the plastic float can't survive in the heat transfer fluid. Maybe this information helps a few folks out there. If you aren't into tinkering, you might want to just move onward.

The bit on making a brass float is here:

http://www.muniac.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=142#Post142
Some here (including me) have jumped out this switch until a replacement can be installed. Be careful doing this as defeating a safety system isn't a good idea. If you bust one of those plastic unions and drain all the heat transfer fluid out, the Hydro-Hot will try to restore an empty tank to 190F. Safe travels.

Best - Scott

2006 Allure 430 40' #31349

(Bus-Stead Lemon) My Allure Page http://www.muniac.com/Allure%20Page.html