Air Humidifier Controller

This would be the two wires coming from the transformer to complete the circuit.

The humistat should have a table on the front portion of the unit and it probably indicates that at this temperature the unit should be on the off setting. There is a lot of moisture in the air so no real need for it to be on. Remember to turn the water supply line off and close the flue off as well.

Yes, however it only established it to the percentage set on the front of the unit. Be sure to get the supply from the hot side of your water heater, not the cold. Also you might need to also have a signal from the furnace control so that you get water only when your system calls for heat.

The H8908B Humidistat will close contacts to turn on a humidifier. Please ensure your humidifier works with a normally open contacts for humidification.

Hi Gary, thanks for your question. The Honeywell Home Humidistat Humidifier Control provides accurate control of whole house humidifiers, dehumidifiers, and ventilators. It is not intended to control heating or cooling equipment, like a heat pump. If you are looking for something to control your heat pump you will need to get a thermostat. We would be happy to help you pick one out that will work for your system type and preferences. Feel free to give us a call at 1-800-468-1502 and our agents will go over the different options available to you. We hope this helps!

I ended up putting an interposing relay in series with the humidistat, because the furnace control board was sending out voltage whenever the blower turned on sending voltage to the solenoid. If you are not comfortable reading an electrical schematic, I would suggest having a HVAC technician take care of this, making a mistake could damage your furnace control module! Good luck.

Hi Jim! Thanks for your question. This specific Resideo Honeywell Home Humidistat Humidifier Control has not been tested for effects from UV lamps. However, we recommend that when installing any product near a UV light source to select a mounting location that will prevent any plastic flexible duct (or other plastic components with unknown resistance to ultraviolet light) excess exposure to the UV light. After prolonged exposure, you may notice some discoloration on the humidistat. If you wish to discuss this further, feel free to give us a call at 1-800-468-1502. We hope this helps!

Hey GC! In order to determine if this is a proper replacement we would need to know the complete model number of the unit that is already installed. Please feel free to call us at 1-800-468-1502 and reference your case number 00965246. Thank you!

Rusty, did you try this with your 560? If so did it work? I think 560s humidistat has also gone out

Hi Don! The Honeywell Humidistat Humidifier Control will provide low-voltage, accurate control of whole house humidifiers, dehumidifiers, and ventilators. It has a snap-acting, dust-proof SPST switch and can be mounted to a duct or wall. We recommend contacting Aprilaire to ensure this humidistat will be compatible with the system you have. They may have a humidistat that would be better suited for your Aprilaire system. We hope this helps!