Question submitted to Aprilaire:
The humidifier is installed such that when the humidistat calls for humidity, it turns on the furnace blower, even though the furnace is not calling for heat. As a result, during dry weather, the furnace blower runs almost continuously in response to the humidifier. This results in cool air coming from the vents, except when the furnace is on. Since we keep the temperature low, this is most of the time. Is this the correct setup, or should the humidifier only run when the furnace is calling for heat? Hope this explanation is clear....thanks
Aprilaires' Response:
Thank you for contacting us with regards to our Model 600 Humidifier. The behavior you describe indicates that your unit was installed using a Blower Activation Relay. This relay allows the humidifier to activate the furnace fan whenever humidity is low. For this to work properly, the humidifier should also be fed by hot water, up to 140°F. All of this is not to say that your installation was correct or incorrect, but this is one set-up option to provide you with the most humidifier run time. If you would prefer that it run only with your heat, you can speak to your contractor about that option as well. Keep in mind that this may mean that with less humidifier run time, the humidity will not rise as quickly in your home. Once your home reaches the set point on your humidistat, the humidifier should turn off. It would only turn on as much as is needed to maintain that level.
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