Question about Aprilaire 600 Humidifier

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Turning on the humidifier shuts off the furnace

I have wired up the Aprilaire 700 and when I turn it up to 5 when the furnace is running, it shuts the furnace off, when I turn it down the furnace comes back on....

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It is possible you may have wired it wrong. Make sure your humidifer is not robbing power from your thermostat. This would explain when your humidifer makes a demand to come on it robs power from your t-stat making it lose its call for heat. Wire your humidistat to the "w" terminal and the common terminal so it only runs on a call for heat. With the bypass type of humidifier you purchased it wont do you any good to run when the heat isn't running anyway. If you want an independent operation humidifier you need a steam type.

Posted on Jan 05, 2009

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