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Series GEN 2 Ultrasonic Humidifier IOM Manual
General Design
The DAH Series Ultrasonic humidifier directly atomizes water with high frequency mechanical oscillation,
producing a fine mist to be delivered into the room by the laminar airflow of an AHU fan.
DAH humidifiers may be mounted in the air distribution ductwork or rack mounted in the AHU. For large
AHU applications with low AHU air velocity, ultrasonic humidifier models DAH-24 and DAH-30 may be
equipped with an optional booster fan to propel the mist out.
The humidifier uses high frequency nebulizers to produce ultrasonic waves and an automatic water supply
mechanism to maintain the supply water at a constant level. When conducting routine maintenance, it is
important to clean the water tank because it significantly affects the humidifying capacity and life of the
ultrasonic nebulizers.
Main Parts
Ultrasonic Nebulizer Unit
This consists of a modular assembly located in the bottom of the water tank incorporating a 1.6 MHz power
oscillator on and a piezoelectric transducer. The transducer vibrates at that frequency, developing ultrasonic
columnar waves in the water and producing a fine mist above that column.
Mist Outlet
Directs mist out of the humidifier and eliminates larger mist particles so the humidifier only introduces fine
mist into the air stream.
High Water Float Switch
For maximum atomization, it is essential the water level in the tank be constantly maintained. The High
Water Float Switch is an input to the Level Controller. It is open when the water level is below the optimal
level and is closed when the water level reaches the maximum level.
Low Water Float Switch
Operating the humidifier when the water level is below the top of the transducers will damage the Ultrasonic
Nebulizer unit. The Low Water Float Switch is an input to the Level Controller. It is open when the water level
is near an unsafe level and is closed when the water level is at a minimal level.
Water Fill Valve Solenoid
The Water Fill Valve Solenoid is a 24VDC solenoid that allows water from the water supply to enter into the
tank when energized by the Level Controller. There is an orifice to restrict the flow of water.
Water Supply Valve
NOTE: This is to be provided by the user.
A valve must be installed upstream from the humidifier for service and maintenance. The valve must be
rated for use with DI water.
Water Supply Tubing
NOTE: Thus user must provide the water supply tubing.
Water supply tubing must be provided to connect the water supply to the water strainer/flow regulator in
the back of the unit. The strainer/flow regulator is equipped with a 90° swiveling, ¼” push-to-connect fitting.
Use ¼” stainless steel or poly tubing rated for use with DI water.
Drain and Overflow Assembly
The Drain and Overflow Assembly contains a 24VDC drain solenoid valve, an overflow pipe and a drain
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