Question about Aprilaire 550 Humidifier
I have an Aprilaire 560 and recently it started to give me headaches. I think that the humidifier should work only when the coil fan is on…and that should happen only when the thermostat calls for heat on this zone. The fan is on “AUTO” and is controlled by the thermostat not by the furnace. If I change settings on my humidistat dial while the coil fan is off, I hear the “click” and the fan is starting instantly…after a while the furnace goes too and the temperature goes beyond the thermostat program. If I lower the humidity level just under the typical “click”, the furnace and the fan stops.
The only way to get some humidity without reaching 78F is to let the fan on “ON” instead of “AUTO” and to raise the level on my humidistat…this way the furnace follows the thermostat program set for 73F.
It sounds like the humidifier may be improperly wired.
It's hard to solve without checking the wiring, but it seems like the humidistat is wired so that as the dial is advanced, it incorrectly turns on the fan, or furnace, or both. The contacts of the humidistat should be wired so that they turn on the solenoid only. Also, the power to the humidistat, to turn on the solenoid, should come on only when the fan is on.
Hope this helps!
Posted on Jan 28, 2009
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Posted on Jan 02, 2017
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