Question about Aprilaire 700 Humidifier

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APRILAIRE 700 TURNS ON AND OFF...

APRILAIRE 700 Wwith new circuit board and humedistat turns on and off 3 or 4 times during furnace ignition before blower kicks in but when blower starts the humedifier stay on and works great, I connected the new board and stat the same way it was connected before, what should I do to fix this problem?
thx in advance.

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  • aschen2000 Jan 26, 2009

    I have exactly the same problem with the Aprilaire 700 running off a Trane XV95 gas furnace. I've emailed Aprilaire but haven't received a reply yet. I'm fairly sure addition of a model 50 current sense relay in series with the solinoid will fix the issue - but I fail to understand why unit cycles on / off when 24v excitation to humidistat remains constant after call for heat is initiated.

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Bad relay?

Posted on Jan 15, 2009

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