Specifications

WHAT YOU NEED TO KNOW ABOUT THE APRILAIRE EVAPORATIVE HUMIDIFIER
Capacity
Evaporative humidifiers efficiently use the HVAC system to operate. The plenum temperature and blower from the
furnace or air handler are used to produce humidity. The amount of time the plenum temperature is raised from a heat
call is variable and so is the actual temperature; with heat pumps around 90 degrees and gas furnaces at 120 degrees.
The HVAC blower is required in all applications to humidify, however, a raised plenum temperature from a heat call is
not required if plumbed to hot water. These variables are all considered in the following capacity chart.
Sequence of Operation
The water in evaporative humidifiers flows to the distribution tray
located at the top of the humidifier. The water is uniformly distributed
across the width of the tray and through a scientifically designed
system of outlets. It flows by gravity over the Water Panel evaporator.
Dry, hot air from the HVAC system is moved through the moisture-laden
Water Panel evaporator where natural 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. When the humidifier
is operating there will be a steady stream of water to drain, which
flushes away most of the trouble causing minerals.
The water, after leaving the distribution tray openings, flows to
the Water Panel® evaporator. It is constructed of slit and expanded
aluminum and coated with a water wicking agent that disperses the water evenly throughout the entire panel area.
Its thousands of coated baffles increase the surface area for air-to-water contact and increase water evaporation
efficiency and capacity.
Forced Air Heat
Humidified Air (Vapor)
Duct
Drain
Dry Air
Water
Panel
®
Water Supply
Water
Distribution Tray
Aprilaire Humidifier Specifications
A. Unit Size (inches) B. Plenum Opening (inches)
Capacity
gpd = gallonsper day
Electrical Data
Model 700*/700M**
Powered Unit – Built-in fan that pulls
heated air directly from the furnace.
A. 15-29/32W x 18H x 10-11/32D
B. 14-3/4W x 14-5/16H
18 gpd 120V-60Hz
0.8 AMP
Model 600*/600M**
Bypass Unit – Uses the furnace blower
to move air through a Water Panel
®
.
A. 15-3/8W x 15-3/4H x 10-1/4D 6” dia. round opening
B. 10W x 12-3/4H
17 gpd 24V-60Hz
0.5 AMP
Model 400*/400M**
Bypass Unit – Uses 100% of water and
evaporative technology that eliminates
the need for a drain.
A. 15-3/8W x 15-3/4H x 10-1/4D 6” dia. round opening
B. 10W x 12-3/4H
17 gpd 24V-60Hz
0.5 AMP
Model 500*/500M**
Bypass Unit – Designed for smaller
homes.
A. 15-5/8W x 13H x 10-1/4D 6” dia. round opening
B. 9-1/2W x 9-1/2H
12 gpd 24V-60Hz
0.5 AMP
Conserves water
^NOTE: Heat pumps – Model 400 can be installed in heat pump applications. However, due to the fact that heat pumps deliver lower temperature
air to the home than gas furnaces, evaporation will be approximately 60 % of rated capacity. (With other Aprilaire models hot water can be used
instead of cold to maximize evaporation. However, due to the nature of the wicking water panel in the Model 400 hot water provides no extra
benefit.) As such, your dealer will need to take the size and age of your home into consideration to ensure the Model 400 will provide satisfactory
comfort and protection through adequate humidification.
*Automatic Digital Control (shown)
**M = Manual Control For those rare occurrences where an automatic control is not practical,
Aprilaire digital control can be installed in manual mode, while still delivering
the accuracy and information you need for optimum performance.