I am specifically using this to control my Isotherm ve150 cooling unit.
I found that the two leads from the cooling unit which I attached to the ITC 1000 could be detached and, when connected to each other, would start the cooling unit. So no power supply to the ITC 1000 cooling elements was needed.
When I connected the to leads to the ITC 1000, the connection was made and the cooling unit started.
The 110V/ 220V/ 12V versions of ITC-1000 have the same wiring method, but the power supply voltage and device power they support are different.
If you only need the cooling function, please connect the wiring of the cooling part, and the heating part does not need to be connected.