I. PRINCIPLE OF OPERATION

With your purchase of a humidification system, you have invested in a humidifier that operates on the evaporative principle – nature’s own way of adding moisture – and will provide the proper relative humidity all during the heating season. It is very possible that you have questions concerning your new humidifier – questions on what it can do for you, and what you should do to receive maximum benefits from it. This booklet is intended to help you do exactly that.

Nature, in producing an invigorating comfortable April day, com- bines just the right temperature and the right amount of moisture. Aprilaire Humidifiers employ the same principle, with refinements, to give you the proper relative humidity for maximum allowable com- fort all winter long.

The important considerations in the evaluation of a humidifier are Positive Control, Sufficient Capacity, Trouble-free Performance and Minimum Maintenance. The operating principle of your Aprilaire provides all of these advantages. Here, briefly, is the method:

The Aprilaire Humidifier is installed to operate in conjunction with the furnace blower motor. When the Aprilaire Humidifier Control calls for humidity and the blower motor is operating, water flows to the distribution tray located at the top of the unit. The water is uni- formly distributed across the width of the tray and through a scien- tifically designed system of outlets. It flows by gravity over the Water Panel® evaporator, the heart of the unit. Dry, hot air is moved through the moisture-laden Water Panel evaporator where the evaporation takes place. The now humidified air carrying moisture in vapor form (nature’s own way) is circulated throughout the home.

The correct water flow is determined by an orifice equipped with each drain type unit. When the unit is operating, there will be a small, steady stream of water to drain, which flushes away most of the trouble-causing minerals. Do not use the saddle valve to regulate the water flow. It is designed to be completely opened or closed. The minerals and solid residue not trapped by the replace- able Water Panel evaporator are flushed down the drain. The drain also eliminates the problems caused by stagnant water. This is the most effective and least expensive method to dispose of trouble- causing minerals.

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Aprilaire 448 owner manual Principle of Operation
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448 specifications

The Aprilaire 448 is a state-of-the-art humidifier that plays a significant role in maintaining optimal indoor air quality. Designed specifically for homes, this unit effectively combats dryness, ensuring that the air within your living space remains comfortable and healthy, especially during the colder months.

One of the standout features of the Aprilaire 448 is its robust capacity to cover areas up to 4,000 square feet. This means that even larger homes can benefit from improved humidity levels, protecting not just your comfort but also your furnishings and overall air quality. By maintaining an ideal humidity level between 30% and 50%, the Aprilaire 448 fosters an environment that reduces the risk of respiratory issues, allergies, and dry skin.

The unit incorporates advanced technology to facilitate easy operation and maintenance. Equipped with a digital control, it allows homeowners to set and monitor humidity levels effortlessly. The digital display provides crucial data on current humidity levels, enabling users to make informed adjustments. Additionally, the unit features a built-in humidistat that automatically regulates the humidity based on the settings, ensuring a consistent and comfortable atmosphere.

Energy efficiency is another hallmark of the Aprilaire 448. The unit is designed to function quietly, avoiding disruptions in your daily life, while using minimal energy compared to traditional humidifiers. The water-saving design ensures that it operates effectively without excessive water consumption, making it an eco-friendly choice for conscientious homeowners.

The Aprilaire 448 also boasts a self-cleaning feature that reduces maintenance time and effort. This innovation helps to keep the unit free from mineral buildup, which is a common problem in humidifiers, thereby prolonging its lifespan and reliability. Furthermore, the easy-to-replace water panel ensures that users can maintain their humidifier with minimal hassle.

In summary, the Aprilaire 448 is a powerful and efficient solution for maintaining ideal humidity levels in larger spaces. With its advanced digital controls, energy-efficient operation, and low-maintenance design, it has become a preferred choice for homeowners seeking to enhance their indoor air quality. Whether combating the winter chill or addressing dryness during any season, the Aprilaire 448 delivers comfort and health benefits all year round. Its commitment to reliability and performance makes it a wise investment for any household.
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