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Old 02-04-2015, 10:11 PM   #1
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Bad Humidistat


I have an Aprilaire Humidifer Model 440 that could be fifty years old. The humidistat is not working. On this model The humidistat is a large mechanical slide that is inserted into the side of the cold air return duct. It appears to measure the humidity on a peace of tape connected to springs and a switch. My question is can I replace this unit with a modern electrical type? I have removed a spring in the humidistat unit to trigger the switch to open the valve thus allowing me to manually control the humidity.

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Old 02-05-2015, 01:38 AM   #2
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Bad Humidistat


Very interesting question. Commenting to follow

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Old 02-05-2015, 04:23 AM   #3
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Bad Humidistat


You can use another mechanical humidistat. Or if you want to do some rewiring, you can switch to a digital humidistat. Digital ones require a common wire to be ran to them.
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