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 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 once per 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. 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 76 Control can be mounted directly in the home for easy access to the humidity setting and measured humidity in the living space. The Model 76 continuously measures the humidity level and will turn on the dehumidifier on-demand.

The Model 76 can also act as a remote control if the dehumidifier is located where it is not easy or convenient to access. When the dehumidifier is located in and dehumidifying a crawl space, sealed attic, or basement, there is no need to have to crawl under the house or trudge up and down the stairs to know that your dehumidifier is working. The Model 76 can be installed where you spend most of your time and making changes to the setting or seeing what the humidity is in these areas can be done from the comfort and convenience of where you live. Consult your installing contractor for more information about the Model 76 Control.

Model 76 Control

1750A-1770A specifications

The Aprilaire 1750A and 1770A are advanced whole-home dehumidifiers designed to optimize indoor air quality by effectively controlling humidity levels. These models are particularly beneficial in regions with high humidity, helping to prevent mold growth, dust mites, and other allergens that thrive in damp conditions.

One of the standout features of the Aprilaire 1750A and 1770A is their capacity to manage significant moisture loads. The 1750A can remove up to 70 pints of moisture per day, while the 1770A is capable of handling up to 90 pints daily. This high capacity ensures that even larger homes or areas with severe humidity problems can achieve optimal moisture control.

Both models utilize a built-in humidistat, which allows for precise monitoring and regulation of humidity levels in the home. The digital display provides real-time feedback on current humidity conditions, enabling homeowners to make informed adjustments as necessary. The automatic operation mode enables the unit to adjust its performance according to the indoor humidity levels, ensuring energy efficiency.

The Aprilaire dehumidifiers are equipped with an advanced refrigeration system that maximizes moisture removal while consuming minimal energy. This energy-efficient design leads to cost savings over time, making them an economically wise choice for homeowners concerned with rising energy costs. The models also incorporate durable, corrosion-resistant components, ensuring longevity and decreased maintenance.

For installation flexibility, both the 1750A and 1770A can be integrated into existing HVAC systems or operated independently. Their compact design allows for versatile positioning, whether in a crawlspace, basement, or utility room. Additionally, they feature an integrated drain system to facilitate continuous water removal, alleviating the need for manual draining.

The Aprilaire 1750A and 1770A also emphasize user-friendly features, with easy-to-read controls and a filter change indicator that simplifies maintenance. With robust construction and dependable performance, these dehumidifiers are engineered for long-lasting use, providing comfort and peace of mind to homeowners in high-humidity areas.

Overall, the Aprilaire 1750A and 1770A exemplify cutting-edge technology and thoughtful design, making them ideal choices for anyone looking to improve their indoor climate through effective humidity control.