What is the difference between AO1 and AO2 control for the Adapter Box G3?

AO1 is designed for heat pumps and other loads that support 0–10 V analog control.

AO2 is intended primarily for precise control of purely resistive loads, such as an immersion water heater, through a compatible solid-state power controller.

Both outputs use a 0–10 V analog signal, but they are intended for different application scenarios.