Principles of Operation

The Aprilaire® Model 800 Canister Steam Humidifier delivers humidity in the form of steam to the conditioned space via the HVAC system duct or optional Aprilaire Model 850 Fan Pack.. The humidifier generates steam by energizing two electrodes that extend into a canister of water.. Current flowing between the electrodes causes the water to boil, creating steam.. Water is introduced to the humidifier through a fill valve to a fill cup located in the top of the cabinet.. The fill cup serves as an overflow reservoir and provides an air gap between the humidifier and water source.. The steam canister is filled from the bottom.. The canister is seated

in a drain cup assembly which includes a drain valve.. The drain and fill valves work together to maintain water level in the canister to deliver the rated steam capacity based on the electrical conductivity of the water and to temper drain water.. See Figure 1 for representation of fill and drain system and canister..

Steam is delivered into the airstream through a dispersion tube mounted in the HVAC system ductwork.. Openings in the dispersion tube are fitted with “tubelets” which extend into the center of the tube.. The design of the dispersion tube and tubelets distribute steam over a wide area in the duct and direct any condensed moisture back into the steam hose..

Figure 1 – Fill and Drain System and Canister

 

Steam

 

Outlet

Fill Cup

Overflow

 

High Water

 

Level Sensor

 

Electrodes

Flow Control

 

Orifice

 

 

Canister

Inlet

Fill

 

Fill Valve

Drain Valve

 

Drain Cup

 

Supply

 

Water

 

Drain

 

90-1522

Specifications & Dimensions

Table 1 – Specifications

 

 

Maximum

Nominal Current draw

Humidifier unit

Voltage

kW

steam capacity

(amps)

operating weight

 

 

 

 

 

gal/day

amps

lbs

 

 

 

 

 

120V

1..4

11..5

11..5

23

 

 

 

 

 

208V

2..4

20..5

11..5

23

 

 

 

 

 

240V

2..8

23..3

11..5

23

 

 

 

 

 

3

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Aprilaire 800 specifications Principles of Operation, Specifications & Dimensions, Specifications Maximum, Humidifier unit
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800 specifications

The Aprilaire 800, a highly efficient whole-home humidifier, is designed to enhance indoor air quality and comfort. As part of Aprilaire's renowned line of whole-home products, this system excels in maintaining optimal humidity levels, mitigating health issues related to dry air, and protecting the integrity of your home.

One of the standout features of the Aprilaire 800 is its impressive capacity to deliver significant moisture output—up to 18 gallons per day. This output is ideal for larger homes, ensuring that every room receives adequate humidity. The unit is particularly effective in combating the adverse effects of dry air during winter months when indoor heating can lead to discomfort and increased susceptibility to respiratory issues.

The Aprilaire 800 employs advanced technology, specifically the use of a self-regulating humidifier design that operates independently of your heating system. This means it can maintain humidity levels even when the furnace is not in use. The unit showcases a built-in digital control, allowing homeowners to set and monitor humidity levels easily. The device can also integrate seamlessly with most HVAC systems, enhancing its versatility.

Another notable characteristic of the Aprilaire 800 is its unique water panel design. The patented self-cleaning feature helps reduce mineral buildup, ensuring optimal performance and longevity. This means that maintenance is simplified, requiring minimal intervention to keep the unit functioning at peak efficiency.

Furthermore, the unit can be connected to a water line for continuous operation, eliminating the need for manual refills. This feature not only adds convenience but also ensures a consistent supply of moisture throughout your home.

Energy efficiency is a key consideration in the design of the Aprilaire 800. Its operation is tailored to minimize energy consumption while maximizing moisture output, making it an environmentally friendly choice for maintaining indoor comfort.

In summary, the Aprilaire 800 whole-home humidifier combines high capacity, advanced technology, ease of use, and energy efficiency. It is an ideal solution for homeowners looking to improve their indoor air quality, comfort, and overall well-being during dry seasons. Whether you are dealing with dry skin, respiratory issues, or damage to wooden furniture, the Aprilaire 800 can be a valuable addition to your home.
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