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Humidifier Connection
A 24VAC bypass or fan powered humidifier may be installed.
NOTE: Do Not Use a traditional humidistat to control humidi-
fier operation. If a humidifier is installed, let t he Observer
®
Control operate humidifier.
Bypass Humidifiers
A bypass humidifier is normally wired directly to the furnace
or fan coil HUM and 24VAC COM terminals. The Observer
®
Control will automatically energize the HUM output during a
call for humidification. See the humidifier installation instruc-
tions for the proper wiring procedure for each particular hu-
midifier.
Fan Powered Humidifiers
Most fan powered humidifiers produce internal 24VAC in or-
der to energize upon a s witch or contact closure. F or this
application, a 24VAC N.O. Isolation Relay (DPST) MUST be
used to prevent mixing the internal humidifier power with the
indoor equipment transformer. Applying 24VAC isolation re-
lay coil to f urnace or fan coil HUM and COM terminals will
allow the Observer
®
Control to automatically energize the
HUM output during a call for humidification. The N.O. relay
contacts will be used to energize the humidifier. See fan
powered humidifier installation instructions for more details.
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