THERMO 2000 VENTUM, Installation And Operation Manual, Page: 13 / 34

VENTUM HYDRONIC AIR-HANDLER Installation and Operation Manual (Revised: June 2021)
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Figure 8: Electrical diagram with digital controller
Table 7 : Legend of available connections
Terminal Description
L1 120 VAC power supply (line)
N 120 VAC power supply (neutral)
GND Grounding
W1 First stage or zone 1 heating request signal (24VAC)
W2 Second stage or zone 2 heating request signal (24VAC)
Y1 First stage or zone 1 air conditioning request signal (24 VAC)
Y2 Second stage or zone 2 air conditioning request signal (24 VAC)
G Fan demand signal (24 VAC)
R 24 VAC signal circuit power supply to the thermostat
C 24 VAC common for continuous supply of the thermostat or 24 VAC accessories
O/B Heat pump 3-way valve supply signal (24 VAC)
HUM Dehumidification request signal (24 VAC)
Y out Air-conditioning request signal to the outdoor air conditioning unit
W out Heating demand signal to the outdoor unit or boiler
Aux Authorization to start the auxiliary boiler (dry contact)
Aux Authorization to start the auxiliary boiler (dry contact)
Not Zone 1* 24VAC contact supplied when no request OR request for zone 1
Not Zone 2* 24VAC contact supplied when no request OR request for zone 2
*The "Not Zone 1" and "Not Zone 2" contacts are accessible directly on the green 7-pole connector located on the back of the
controller. No indications are present for these contacts. These contacts can be useful when the VenTum is used in "zone"
mode and you want to connect motorized shutters to it.