The Model 400A 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. Automatically adjust humidity levels based upon outside air temperature with Automatic Digital Control and remote sensing bulb. Humidifies up to 4,000 square feet if your home is tight in construction. The Model 400A 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 automatic digital control humidistat, sensing bulb, water pad, 110v to 24v transformer and manufacturer's special instructional DVD.

Automatic Digital Control Features

• Shows that the humidifier is operating
• Allows you to check relative humidity level
• Tells you when it's time to change the water panel
• Gives you service alerts

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