Aprilaire 400 Series User manual

A PART OF THE APRILAIRE
®INDOOR AIR COMFORT SYSTEM
Patented Technology from the Technology Leader
NO DRAIN REQUIRED! • NO STANDING WATER!
The Aprilaire Series 400 uses breakthrough technology that uses
100% of the water that goes into the unit. It’s an excellent option for
customers with septic systems, locations where a floor drain is not
available or families interested in water conservation.
The Series 400 offers quick installation and easy maintenance without the problems standing water, creates like
offensive odors and burned-out components associated with drum-type and portable humidifiers. It’s just the
technology you expect from Aprilaire – the leader in whole-house humidification.
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FRESH IDEAS FOR INDOOR AIR
CONSUMER benefits CONTRACTOR benefits
The Series 400 is Another Quality Product from the Leader in Residential Humidifiers – Aprilaire
• ENVIRONMENTALLY FRIENDLY
• PRESERVES SEPTIC SYSTEMS
eliminates routine water drainage
• SAVES MONEY
lower water and sewer costs, energy
• SIMPLE AUTOMATIC DIGITAL CONTROL FEATURES
set it and forget it technology
• FAST AND EASY
installation for every application
• PRODUCT RELIABILITY
happier customers means fewer callbacks
• PATENTED TECHNOLOGY helps protect your
markets, keeps dealers on the cutting-edge in
meeting customer needs
• SAFETY FEATURES eliminate overflows
• NEW SOLUTION for septic or drainless
SERIES 400 AUTOMATIC HUMIDIFIER
Whether you’re updating your home to be more healthy, energy-efficient and sustainable or
you’re building a new green-certified home, Aprilaire offers a complete line of innovative
products designed to improve the quality of indoor air. Our humidifiers help by ensuring that
your entire home has just the right amount of moisture for the ultimate in protection and
comfort. Whole-house humidifiers help prevent premature aging of your home’s structure,
provide optimum comfort and can protect respiratory systems against viruses and bacteria.
Humidity control helps qualify your home for the Green-Built Certification Program of the
National Association of Home Builders.
Get green with greater comfort from Aprilaire
Aprilaire Series 400
• Uses 100% of the water that goes into it
• Excellent option for customers with septic systems
• Humidifier of choice for families interested in water conservation
• Best choice on jobs where no drain is available

HOW IT WORKS
When the Automatic Humidifier Control calls for humidity:
• The solenoid valve opens and water flows into the water panel evaporator. Water enters the right float chamber.
• As water enters the float chamber, the float inside begins to rise. This breaks the electrical connection with the
water level sensor and shuts the unit off by disconnecting power to the solenoid valve.
• Water in the float chamber wicks up the panel and is evaporated as the furnace moves air through it.
• As water wicks up, the float drops down and makes contact with the water level sensor assembly. This restores
the electrical connection and opens the solenoid valve. The entire process repeats itself until the furnace blower
shuts off or the humidistat is satisfied.
PRODUCT SPECIFICATIONS
Evaporative Capacity: .7 g.p.h. / 17 g.p.d.
Area It Will Handle:
• Loose House (2 air changes per hour) - 1000 sq.ft.
• Average House (1 air change per hour) - 2000 sq.ft.
• Tight House (1/2 air change per hour) - 4000 sq.ft.
Unit Size (Inches): 14" W x 15 1/8" H x 10 3/8" D
Bypass Connection: 6" round
Plenum Opening: 9" W x 12" H
Electrical data: 24 V - 60 Hz - 0.5 amp
Models: 400 - Includes premium automatic
digital control
400M - Includes manual control
THE SERIES 400 INCORPORATES SEVERAL SAFETY FEATURES
The left float chamber operates as a safety back-up to the right float. In the unlikely event the right float failed and
water continued to fill the chamber, the water would spill into the left float chamber and shut off power to the solenoid
valve. This chamber is isolated from the wicking action of the water panel and the air coming through the humidifier.
During the heating season, water in the isolated back-up chamber will evaporate over approximately two days. If the left
chamber dries out, the safety float would engage the solenoid valve, but the system would again shut down. This design
eliminates overflows.
If both floats were to fail, water would flow out of the left-hand float chamber and into the center of the scale control
insert, which would direct the water to the safety overflow connection at the bottom of the humidifier.
SERIES 400 AUTOMATIC HUMIDIFIER
P.O. BOX 1467 • MADISON, WI 53701-1467 • Phone [phone] • FAX [phone] • www.aprilairecontractor.com
Form No. 215 07.13 © 2013 Research Products Corporation