Aprilaire 4016
Aprilaire Manual Humidistat spst 24v or 120v
No Longer Available.

This Model 4016 Humidistat is no longer available. Use Aprilaire  Model 4655 as replacement.

Aprilaire Model 4016 manual humidistat designed for 24v & 120v humidifier control. Humidity is sensed using a nylon ribbon that expands with an increase in humidity.

Includes humidistat, as shown our photos.

√ SPST Dust-Proof Switch
√ Operating Differential 8% RH
√ Rating 24 vac 5.2 amps
√ Nylon Ribbon has Clear Inspection Window
√ Mounts on Wall Surface

For wiring to 24vac humidifier, use 2-conductor thermostat wire, not included. The RP-4016 is not designed for duct mounting.

Used in the Model 350 360.

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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