Aprilaire Humidifier Installation

Aprilaire humidifiers are one of the best in the world. When you buy a particular Aprilaire humidifier, then the company provides an installation manual with it. The Aprilaire humidifier installation manual will help you to install it on your own by following the step by step approach mentioned there. This will also help you to cut cost on hiring an electrician to do the job. Before the Aprilaire humidifier can be installed there are three important things that should be taken into consideration:

  1. You need to install all the power units on the warm air plenum while the humidistat should be on the return or on the new outdoor sensor.
  2. You can install all by-pass models on the return drop or on the warm air plenum with a venting of 6".
  3. Make sure that the humidistat is at a higher level than the unit to enhance proper reading.

Here is a graphic representation of the installation

The Aprilaire Humidifier can be operated using 2 modes, which are automatic and manual.


Automatic Mode
The Aprilaire humidifier control is always installed within the cold air return duct. When the first heating season starts, you will need to set your humidifier control to match the condition in your home. You can follow the steps mentioned below to adjust your control:

First turn the dial setting knob as shown in the image above to 5, which is well within the normal range. In the next 24 to 48 hours, you may have to adjust the dial depending on the requirement for more or less humidity as well as your comfort.
In the coldest part during the first heating season, you will have to make some minor adjustments, which depends primarily on the construction details of your home.

The Aprilaire automatic humidifier can maintain relative humidity with accuracy. For every 1° change that takes place in the outdoor temperature, the automatic control will adjust the indoor relative humidity (RH) by 1/2%.

Manual Mode
The Aprilaire humidifier control installed can work manually also. To work manually, you should be able to anticipate the drop in outdoor temperature so that you can reduce the setting manually to avoid excessive condensation. Let's take an example. If the outdoor temperature is 20°F then correct manual setting will be 35% relative humidity.

Similarly during the winters, the ideal indoor RH is 50%, but there is a possibility of the RH percentage causing damage in your home. 50% RH can lead to water condensation on the inside of window panes, which is basically an indicator of high relative humidity.