Where is the humidity sensor on my humidifier?

Thursday, December 29, 2011 by Aprilaire Team
Consumer question:

We have a manual control for our Aprilaire Humidifier that is located in the same room as the furnace. Where is the sensor that detects humidity? Is it in the control? Is it on the thermostat on our main level? Where are the sensors normally installed? Also, what % of humidity should our house be at to still be safe without having too much humidity? Also - our Aprilaire runs without our furnace on - our fireplace heats our house well enough to not have the furnace run - it is ok to have the Aprilaire run thru the ducts with just cold air?

Aprilaires' response:

The humidity sensor is located in the humidistat controller. Now, which controller you have will determine the location of the sensor in the humidistat.

Do you have a 'test / reset' position on the controller? If you do, then the sensor is sticking out of the back of the controller and is located in the ductwork.

If you do not have a 'test / reset' position, and printed directly on the front of the controller are the number 15% through 45% then the sensor is inside the humidistat. If you have this mounted on the wall, it is sensing the air in the room it is located in. If this is installed into the ductwork, then it would be sensing the air in the duct.

It is acceptable to run the humidifier on just a fan call, no heat call. Just make sure to have hot water into the humidifier.

Any level of humidity is ok to have as long as you do not have condensation on your windows.

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