7.6.2 Ceiling Unit Air Filter Replacement Procedure
1. Turn OFF all electrical input power to the ceiling unit with the external disconnect.
2. Using an OSHA approved ladder, remove filter cover from the side of the unit to access the filter.
3. Remove the old filter(s) from unit. Use care to prevent any damaged to the existing sensors and/or other
components that may be mounted near the filter(s).
4. Replace with new filters of equal size and type. Install the filters in the proper direction of the airflow. New
filters must be U.L. approved.
5. If equipped, test the operation of the filter differential pressure switch. The unit panels must be in place
and closed to determine the proper differential pressure setpoint.
6. Turn ON the electrical input power to the unit which will start the blower(s) and if possible, temporarily
cover approximately 75% of the return air opening using heavy cardboard or similar material to cause the
filter differential switch to alarm. Adjust the switch setpoint, if necessary.
Humidifier
Some units are provided with a self-contained, microprocessor-controlled steam generator type humidifier as
standard equipment and others as an option. The steam generating humidifier uses a disposable cylinder with
electronic controls. The humidifier discharges pure steam with no material dust carry-over and has a self-regulating
automatic flush cycle. Cylinders are disposable and do not requiring cleaning or maintenance. The humidifier fill
level, water conductivity and flush rate automatically adapt, both in frequency and duration, to variations in the
incoming water. The humidifier assembly is capacity field-adjustable and includes a high-water probe. Drain
duration and drain interval are also field-adjustable. See the humidifier manufacturer’s literature for more detailed
information on field adjustments.
7.7.1 Humidifier Cannisters
The humidifier has been designed to require very little maintenance. Regular maintenance consists of checking the
humidifier to insure it is in good condition, replacing the cylinder when the software advises that the cylinder is
spent and cleaning out the drain valve whenever the cylinder is replaced. The frequency of change will depend on
usage and water type. A set of the humidifier manufacturer’s instructions is included with the paperwork placed
inside the unit when it ships.
7.7.2 Cylinder Spent Fault
After an extended period of operation, the cylinder is completely spent the humidifier will stop operating and the
yellow LED will flash in a repeating pattern of 4 flashes. At this time the cylinder must be replaced. The steam
cylinder is disposable and must be replaced at end of cylinder life. Cylinder life is dependent on water supply
conditions and humidifier usage. Failure to replace the cylinder at the end of cylinder life will result in improper
operation and may result in damage to the humidifier. Data Aire is not responsible for any damages resulting from,
or attributed to, the failure to replace a spent cylinder. Data Aire recommends keeping a replacement cylinder in
stock throughout the humidification season. This will prevent possible downtime when the humidifier reports
cylinder end of life.
7.7.3 Replacement Cylinder
The label on the existing cylinder identifies the cylinder type in its top left corner. When ordering a cylinder always
quote the three or five-digit model number on the label, the humidifier’s serial number, and the humidifiers voltage.
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