5407934-UIM-C-1119
Johnson Controls Ducted Systems 29
TABLE 5:
Humidification - Communicating and Conventional (Non-
Communicating) Systems
Communicating Humidification
Options
Conventional Humidification
Options
No humidification: If you select the NO
option for the humidifier in the general sys-
tem settings, humidification operation does
not occur.
No humidification: If you select the NO
option for the humidifier in the general
system settings, humidification opera-
tion does not occur.
Humidification with equipment: The HUM
output sends power to the humidifier equip-
ment if there is a demand for humidity and
the heating equipment is actively heating.
This option is only available if a humidifier
is installed. Gas furnaces provide a 120
VAC output for a power humidifier or a con-
trol transformer if a bypass humidifier is
used. Air handling units provide a 24 VAC
output for a control relay for a humidifier. If
a steam humidifier is used, the equipment
HUM OUT connection is for a control relay
only. In Auto mode, the indoor humidity set-
point is automatically adjusted in relation to
the outdoor temperature.
Humidification with heat demand: The
HUM output from the thermostat
enables the humidifier equipment if
there is a demand for humidity and the
heating equipment is actively heating.
This option is only available if a humidi-
fier is installed. The HUM output is 24
VAC to power a control relay for a
humidifier. In Auto mode, the indoor
humidity setpoint is automatically
adjusted in relation to the outdoor tem-
perature.
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