Question about Aprilaire 700 Humidifier

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What should my humidifier be set at for the winter?

I have a 5 year old Aprilaire 700. It seems dry in the house and it was set at 35%. How do I check to see if it's even working?

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Hi, Jennifer:

I'm no expert, but those who are seem to agree that the first thing to check is your evaporator panel. Aprilaire recommends replacing it annually--so if you haven't replaced it recently, that would be the first step to take. Next, check the power supply to your Aprilaire unit. Turn the humidistat to 0%, and then turn it slowly back toward 35% until you hear a click at the unit. If you don't hear a click, you'll want to check that the unit is in fact getting electric power (you may want to get an electrician or furnace tech to do this). If you do hear the click, the next thing to check is whether you have sufficient water flow to your Aprilaire unit. On mine, I had to adjust my water supply saddle valve, as well as the inline valve on the discharge side of the solenoid (see prior post from this morning)--and this seemed to clear the lines and restore water flow. Once you achieve proper water flow, you will probably want to set your humidistat at 35% for winter temps of around 20 degrees F--but be sure to adjust it downward for colder weather. Comments, anyone?

Posted on Dec 15, 2008

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Hello, the humidifier should turn on and off with the furnaces blower motor. Usually if it runs continously it means the solenoid valve is stuck open, in this case the solenoid valve must be replaced. The condensation is normal comming out of the pvc pipe, and the humidistat should be set according to your outside air temp

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