Product Overview
Control the relative humidity in your home with precision and ease with the Aprilaire 5558 Automatic Digital Modulating Control Package for the 866 Ductless Steam Humidifier. This wall-mounted humidistat boasts a microcomputer design and offers a large LED digital display with a backlight and the ability to lock in your preferred relative humidity set-point from 0 – 100% RH.
This control also includes an Outdoor Temperature Sensor which automatically readjusts the humidity set-point based on the difference between the room temperature and the outside temperature to prevent window condensation in colder climates.
Additional Wall-Mounted Control Features:
- Selectable Celsius or Fahrenheit scale.
- Outputs controlling humidification and dehumidification equipment by means of on/off or proportional output signals for greater flexibility.
- Modulating Output Signal provides a 0-10Vdc or 2-10Vdc proportional control signal to the humidifier.
- Integrated sensor for better application flexibility.
- Programmable Proportaional Band to increase or decrease the sensitivity of the humidifier control.
- Humidity set-point reset function based on outdoor temperature which helps prevent condensation in colder climates.
- Humidifier On-Off signal 24Vac dry contact capable of handling up to 1 amp.
- Proportional High Limit Override to prevent over-humidification within the duct and costly water damage.
- Multi-level lockable access menu and lockable set point to prevent accidental changes.
- Indicator when outdoor temperature setback is used for winter compensation.













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