IBC AHU Series - Page 17

Low Voltage Terminal Description Notes
Com Connects to outdoor
appliance.
S1 Compressor Stage 1 Connects to outdoor
appliance.
S2 Compressor Stage 2 Connects to outdoor
appliance (2nd Stage if
applicable).
Humidifier
Com Humidifier
24VAC powered
Closes to activate the
humidifier.
HUM Humidifier
De-humidifer
Com De-humidifier
24VAC powered
Closes to activate the de-
humidifier.
DEH De-humidifier
OpenTherm
OpenTherm Master To X-13 (1-2) on boiler (IBC
SFC/SFB series)
The air handling appliance
(master) communicates to
(controls) the boiler
(subordinate).
OpenTherm Slave From OpenTherm thermostat The thermostat (master)
controls the air handling
appliance (subordinate).
Note
OpenTherm is a standard communications protocol used in central heating systems for the
communication between a central heating device and thermostat.
15
Thermostat connections