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Measured 21.5v AC across the open terminals that trigger the vac to turn on. It's rated at 24v, so I'm not sure if that indicates a problem with the transformer or not. It's 90% of rated output. If my theory is right that the voltage holds open the relay, it may simply be the voltage drop that occurs holding that relay open (dumb design if that's actually how it operates).
A good design would have the relay normally open, with a voltage applied causing it to close and turn on the vac. In other words, component failure should cause the vac to remain off, not switch on.
The only reason I can think of to have a component failure trigger the vac to turn on is that there is a manual switch for the vacuum. If component failure occurs, I can still switch the vac off manually, and switch it on as needed.
My worst fear would be taking a week vacation somewhere and having an 800 watt vacuum running continuously the whole time. Would probably burn up the vac too.
Anyhow, I know nothing about vac design and could come up with a better product in my sleep. Don't know how these companies that have 1 job can suck so bad. My products would suck very good.
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