Aprilaire 56
Aprilaire Model 56 Auto Trac Humidistat w/Outdoor Sensor
No Longer Avilable. Replaced by model 60
  Manual Automatic Automatic Automatic

Aprilaire Model 56 automatic humidistat designed for low voltage (24v) humidifier control. Computer-equipped, completely automated, never needs manual adjustments. The advanced computer technology measures the outdoor temperature and indoor humidity and continually adjusts your homes indoor humidity to its optimum level.

Includes humidistat, outdoor temperature sensor with 36 inch wire and bracket, manual mode resistor.

The outdoor temperature sensor is located outside and is connected to the humidistat with regular 2-conductor thermostat wire. The 2-conductor thermostat wire is not included.

Manual Versus Automatic Humidistat

The indoor humidity level needs to be set based on the outside temperature. This is to prevent water from running down the windows. The cool air near the windows can not hold the humidity and water will condense on the glass. To prevent this condensation, the indoor humidity level is sacrificed by lowering the humidistat.

An automatic humidistat (Aprilaire 60) adjusts the humidity by using an outside temperature sensor.

The Aprilaire manual humidistat as used in earlier Aprilaire humidifiers (Model 4655) requires adjusting the relative humidity based on the outside temperature. A manual humidistat needs to be set back as the season gets colder. The chart below shows the humidity setting for a range of outside temperatures.

When The Outdoor
Temperature is
This Relative Humidity
Should Be Maintained
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