Observer TSTAT0101SC, Installation Manual

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Bypass Humidifiers
A bypass humidifier should be 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.
Fan Powered Humidifiers
Most fan powered humidifiers produce internal 24VAC in or­
der to energize upon a switch or contact closure. For 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 furnace 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.
Commissioning
Overview
This section addresses initial power up (or commissioning) of
an Observer Control. The wall control will communicate and
identify all communicating components in the system.