Setting the Desired Humidity Level

At the inlet side of the unit, a humidity control knob sets the desired humidity level between 1 (less dry, dehumidifier runs less) and

7 (more dry, dehumidifier runs more), or can be used to turn the dehumidifier OFF. The ON/OFF switch on the front of the unit should be left ON and only be used to turn the dehumidifier off when performing maintenance (see page 4 for maintenance requirements).

Set the control at a Normal level, between 3 and 4, when first installed. Allow the dehumidifier to run for 24 hours before deciding if you want to change the setting.

•If you prefer the air to be more dry, increase the setting; this will increase the amount of time that the dehumidifier runs.

•If you prefer the air to be less dry, decrease the setting; this will reduce the amount of time that the dehumidifier runs.

The settings on the dial can be approximated to relative humidity (RH) using the table to the right.

Your comfort is the best measure of how to adjust your setting. When first installed, your dehumidifier has to remove all the moisture that is initially in your home. The home acts like a sponge so the moisture in the materials of your home is at the same level as the air. After drying the air, the materials of the home will release moisture back into the air until they are again at the same level. As a result, it is not uncommon for the dehumidifier to operate for an extended period when first installed.

Humidity Control Knob

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Control Knob Setting		Indoor Temperature (°F)
Control Knob Setting	65	70		75	80
	65	70		75	80

1			84%	71%	60%

2	86%		73%	61%	52%

3	74%		63%	53%	45%

4	64%		54%	45%	39%

5	55%		46%	39%	33%

6	47%		39%	33%	28%

7	40%		34%	28%	24%

Note: This table is for reference only.

Energy Savings Tip

Adjust the setting to be as low as is comfortable to reduce dehumidifier run time – if it feels clammy or smells damp, raise the setting.

To save energy, turn the dehumidifier setting to OFF when you open your windows just as you would with air conditioning.

When Does the Dehumidifier Turn On?

The dehumidifier turns on the first time that the blower in your home heating and cooling system turns on (i.e. air conditioning comes on or you run the fan continuously) within the Cycle Period. Your installing contractor set the Cycle Period when the dehumidifier was first installed; it may be set for once every 30 minutes, once per hour, once every two hours or once every three hours. If the heating and cooling system blower does not turn on within the Cycle Period, the dehumidifier will turn itself on at the end of the Cycle Period. The Cycle Period setting determines how frequently the dehumidifier measures the humidity level in the air; once per hour is usually sufficient to maintain comfort. If you want the dehumidifier to check the humidity level more or less often, contact your installing contractor.

An optional Model 75 Control can be mounted directly in the home for easy access to the humidity setting and measured humidity in the living space. The Model 75 continuously measures the humidity level to turn on the dehumidifier on-demand. Consult your installing contractor for more information about the Model 75 Control.

Model 75 Control

1770A, 1750A specifications

The Aprilaire 1750A and 1770A are advanced dehumidifiers designed to enhance indoor air quality by effectively managing humidity levels in residential settings. These models stand out for their efficiency and durability, making them popular choices for homeowners seeking to create a comfortable living environment.

One of the main features of the Aprilaire 1750A is its ability to remove up to 70 pints of moisture per day, while the slightly larger 1770A can handle up to 90 pints. This powerful moisture removal capacity makes both models particularly suitable for larger homes or spaces prone to high humidity, such as basements and attics.

In terms of technology, both units utilize a robust and energy-efficient compressor system that operates quietly, ensuring minimal disruption during their operation. The dehumidifiers are designed with an innovative control system that allows for humidity settings to be easily adjusted, providing users with full control over their indoor environment. This intelligence enables the units to efficiently operate only when necessary, resulting in significant energy savings.

The Aprilaire 1750A and 1770A feature an automatic drain option, allowing for continuous operation without the need for frequent manual emptying of the water reservoir. This functionality is particularly beneficial in high-humidity areas where regular monitoring may be cumbersome. Homeowners can also appreciate the unit’s easy-to-clean filter, which helps maintain efficient performance and prolongs the life of the dehumidifier.

Both models come equipped with an integrated humidity sensor, which actively monitors the humidity levels in the home. This allows the units to adjust their operation automatically based on the current conditions, optimizing moisture removal while maintaining energy efficiency. The sleek and compact design of the Aprilaire models ensures they can fit unobtrusively into most spaces, while durable construction materials guarantee long-lasting performance.

Moreover, the Aprilaire 1750A and 1770A models are backed by a comprehensive warranty, offering peace of mind to homeowners investing in their comfort and health. Overall, these dehumidifiers are excellent choices for anyone looking to improve air quality and create a healthier, more comfortable indoor atmosphere. Through their advanced features, reliable performance, and user-friendly design, the Aprilaire 1750A and 1770A stand out as leaders in the dehumidification market.

Aprilaire 1770A, 1750A Setting the Desired Humidity Level, When Does the Dehumidifier Turn On?

Models: 1770A 1750A