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Posted by Dave on November 23, 2007 at 20:14:46:
We have a hot water heating system with a flow switch in our main loop that goes between our low mass boiler and an Ergomax reverse indirect storage tank. The pump in this loop is a Taco 0010. Last March we had no heat and found out that our McDonnell Miller flow switch was not tripping. I believe it was the FS8. I replaced it with another one, and we were fine until tonight when we came home and again had no heat. I twisted the wires from the switch together, and we again have heat. Why would be losing 2 switches in 8 months? The water is a 30% glycol mix. Everything else seems fine. The switch is in a striaght run of 2" copper pipe on the outflow of the boiler. The paddle looks plenty long enough. Would there be some better switch to use? Thanks. Dave