IBC AHU Series Installation And Operating Manual

Low Voltage Terminal Description Notes
S2 Not used
Compressor
Com Connects to outdoor unit.
S1 Compressor Stage 1 Connects to outdoor unit.
S2 Compressor Stage 2 Connects to outdoor unit
(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 unit
(master) communicates to
(controls) the boiler (slave).
OpenTherm Slave From OpenTherm thermostat The thermostat (master)
controls the air handling unit
(slave).
Note
OpenTherm is a standard communications protocol used in central heating systems for the
communication between a central heating device and thermostat.
11
Thermostat connections

IBC AHU Series Specifications

General

Brand	IBC
Model	AHU Series
Category	Air Handlers
Language	English