6
Series GEN 2 Ultrasonic Humidifier IOM Manual
Controller, failure to receive commands on the Modbus within a predetermined amount of time will
annunciate a communications alarm.
The Level Controller has an LED that displays, by blinking, any alarm condition that occurred after power
up. Each alarm is associated with a number of blinks, followed by a pause, and then the next alarm is
displayed. To view the LED, the Mist Guide Cover must be removed and the electrical access cover
removed. The LED blink pattern for each alarm is provided below:
Number of
Blinks
Alarm Condition
1
Low Voltage
2
High Voltage
3
Freeze
4
High Temperature
5
Low Water
6
Fill Alarm
7
Communications
8
Transducer
Booster Fan (Optional DAH-24/30 Only)
DAH
Series Ultrasonic
Humidifiers are to be installed in air handlers or air ducts designed with a terminal
velocity of 450 to 750 FPM across the humidifier so the mist is
readily eliminated by the pressure drop
caused by the air passing over the mist guide. When using continuously adjusting fan speeds in air handlers,
it is possible for the air velocity to drop below the minimum velocity (300 FPM) required to direct the mist
out of the humidifier.
An optional booster fan assembly may be attached to the back of the
humidifier
for such applications
(available for DAH
-24 and 30 units only). The booster fan provides the minimum air
fl
ow needed to direct
the mist from the
humidifier
even when it is operating in an air stream with less than the minimum required
velocity.
F
igure 2. Booster Fan Assembly
AIR IN
AIR OUT
Summary of Contents for DAH
Page 41: ...Series GEN 2 Ultrasonic ...
