(©January, 2008)
Air Technology Systems, Inc.
BNB Ultrasonic Humidifier Installation, Operation & Maintenance Manual
1-5
1.5 General Design
The
BNB Ultrasonic humidifier directly atomizes water producing a fine mist and is equipped with a fan to deliver
the mist into a room. It is possible to adjust the atomization to maintain room conditions by changing the air
volume.
A complete system consists of the humidifier to produce mist and a transformer (optionally provided by SATS), to
supply power to the humidifier. The humidifier incorporates ultrasonic nebulizer unit(s) to produce ultrasonic waves,
a fan to send out the mist, 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 air filter and water tank because it
significantly affects the humidifying capacity and life of the ultrasonic nebulizers.
1.6 Main Parts
1.6.1
Ultrasonic Nebulizer Unit
Modular sub-assembly located in the bottom of the
water tank incorporating a plate with amplifying circuitry
and a transducer. The transducer oscillates at a high
frequency, producing ultrasonic waves in the water.
1.6.2
Solenoid Valve and Float Switch
(Automatic water supply mechanism)
For maximum atomization, it is essential that the water
level in the tank be constantly maintained. Water level
suitable for atomizing is maintained by means of a
solenoid valve and float switch. When the water level in
the tank falls below the designed level, the float switch
contact turns ON and the solenoid valve opens to
supply water to the tank. When the correct water level
is attained, the float switch contact turns OFF, closing
the solenoid valve.
1.6.3
Relay Board and Float Switch
(Automatic low water shutdown mechanism)
Operating the humidifier when the water level in the tank
is below the top of the transducers will damage the
transducers and the circuitry in the ultrasonic nebulizer
unit. A float switch and a relay are used to prevent the
humidifier from “dry” running. If the water in the tank falls
below a safe level for any reason, the float switch
contact turns off shutting off the relay thus, cutting off
the power supply to the unit.
1.6.4
Fan
Blows the mist produced from the humidifier into the
conditioned space.
1.6.5
Air Filter
Filter for removing coarse dust from the air and prevent
the humidifier water tank and interior from becoming
dirty.
1.6.6
Control Board
Contains relays and protective circuit devices used to
control the operation of the unit.
1.6.7
Screw for Adjusting Air Volume
A screw on the side of the humidifier connected to the
air volume plate is used to adjust the atomization in
accordance with the desired room conditions.
1.6.8
Water Supply Valve
(To be provided by user)
This valve should be installed upstream from the
humidifier for service and maintenance. The valve must
be rated for use with DI water.
1.6.9
Water Supply Tubing
(To be provided by user)
This connects the water supply to the water supply
compression fitting. The tubing must be rated for use
with DI water.
1.6.10 Conductivity Sensor (Optional)
A probe installed in the water supply piping for monitor-
ing water quality.
