Models ESU14 & ESU20
SUPPLEMENT TO THE ELECTRONIC STEAM
POWER HUMIDIFIERS MODEL #S2000 AND S2020
Field Controls Humidifiers
2.WIRING - Another important difference in the replacement of an “ESU” model with a new “S” series humidifier is the wiring connections. On the “ESU” the humidity control was connected to the two ‘WHITE” wires on the molded plug. When upgrading to the “S” series, simply cut the two white wires and connect them to the two “H” terminals on the top of the front cover.
The blower (fan) interlock was connected via the two red wires on the old “ESU” model and usually incorporated a field installed transformer and interlocking relay. Just cut the two red wires and connect them to the “R” and “G2” terminals on the top of the front cover. In this method you can reuse the field relay and transformer which were originally installed with the ESU.
If this is a new install then you can fully utilize the on board relay provided with the “S” series humidifier and interlock your blower “fan” by following the low voltage diagram. There is no need to install a separate transformer or relay.
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| S 2000 & S 2020 T ypi cal W i r i ng |
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| and B l ower I nter l ock Di agr am |
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| S2000 & S2020 Humidifier | |||
| Typical |
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| Thermostat | G2 | H | H | ||
R | W | G | G1 R | |||
Y |
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R | W | G | Y |
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| Furnace |
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| Humidistat | ||
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| H eat & Cool S ystem |
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DO NOT plug the molex connector from the old “ESU” humidifier, into the socket on the side of the front cover on the new “S” series humidifier. That socket connection is now reserved for the automatic drain valve only. Doing so will damage the unit and void the warranty.
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 | |
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