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Aprilaire 400M

24v Drainless Bypass Model w/ Manual Control & Humidity Readout

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The Model 400M bypass humidifier is a high-capacity, water-conserving humidifier (0.70 gallons evaporated per hour) incorporating a water recirculation system for use where drain facilities are not accessible or available. It uses 100% of the water that goes into the unit. For those rare occurances where an automatic control is not practical, Aprilaireoffers a manual control to meet your needs. Humidifies up to 4,000 square feet if your home is tight in construction. The Model 400M is also a good choice for homes with heat pumps. Due to lower plenum temperatures the unit should be connected to your hot water supply line. This humidifier can be installed on the supply or return air ductwork. It is also left or right side reversible. Includes manual control humidistat, water pad, 110v to 24v transformer and manufacturer's special instructional DVD.

Other items needed for the installation that are not included: 1/4" copper tubing for water line, 6" round ducting & elbow for bypass air, 2-conductor 18 to 22 gauge wire. These items are available in our easy installation kit.

Type

The two main types of standard humidifiers are the bypass and power fan.

Bypass humidifiers can be installed on either the supply or return plenum and you run a bypass duct to the plenum the unit isn't installed on.

Power-Fan humidifiers can be installed on a vertical run of either the supply or return plenum and uses a fan to distribute humidity into the air stream.

Type
Bypass
Water Capacity (GPD)

The amount of water vapor that can be delivered into the home, measured in gallons per day (GPD), that the humidifier can deliver into the space.

Water Capacity (GPD)
17 Gallons/Day
Water Feed Rate
3 Gallons/Hour
Evap. Capacity
.70 Gallons/Hour
Electrical Requirements

The electrical requirements either 24 volts (bypass humidifiers) or 120 volts (power fan humidifiers) that needs to be supplied to the unit.

Electrical Requirements
24 Volts
Remote Sensing Bulb

A remote sensing bulb is a small (about ¼” round) sensor that mounts outside the home and connects by light gauge wire (18 to 22 gauge, 2-conductor) to the humidifier controller. This sensor provides temperature readings to the computerized controller which allows the humidifier to automatically adjust humidity levels in the home based on outside air temperature.

Remote Sensing Bulb
Not Available For This Model
Bypass Duct Diameter
6 inches
Plenum Opening Size
10W x 12.75H inches
Width
15 19/50 Inches
Height
15 3/4 Inches
Limited Warranty
5 Years

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.