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3. DRAINS - It is still necessary to run an overflow drain line from the humidifier to a suitable
drain. Now, it is also required to run an additional drain line from the new automatic drain valve
to a suitable drain.
The new “S” series humidifiers have an automatic drain valve which will drain the tank every 12
hours, to minimize chemical buildup inside the tank. The water is allowed to cool down to 140
degrees F. before the water is drained out.
The humidifier drains by gravity only, so it must be mounted at a sufficient height to allow for
proper drainage. DO NOT route the drain hoses above the level of the humidifier, and watch for
kinks or cuts in the hoses.
If you have a basement installation and require draining into a condensate pump, we recommend
a Beckett Model # CU451ULHT or CU551ULHT. These pumps are rated for high temperature
water and have built in check valves.
4.WATER - The frequency which the water fill solenoid on the new steam unit will activate can
exceed the older model. This more frequent filling of the tank may be noticeable in the form of
water hammer noise or spikes in the water line. Install an optional water hammer arrester
#WH-100, and the noise will dissipate.
If this Engineering notice does not cover a question or issue that you have encountered during
your installation or replacement project, please contact the Technical Support Hotline @
1-800-446-3110.
Field Controls Humidifiers
AN-137 Replacement Instructions for
Models ESU14 & ESU20
SUPPLEMENT TO THE ELECTRONIC STEAM
POWER HUMIDIFIERS MODEL #S2000 AND S2020
P/N 090376A0137 REV. D 10/2011 Copyright © 2011, Field Controls Inc., All Rights Reserved
Field Controls Inc. 2630 Airport Road Kinston, NC 28504 PH: 252.522.3031 FAX: 252.522.0214