Vaillant sensoCOMFORT VRC 720/2 Manual De Uso E Instalación página 22

4 -- Using the functional modules, basic system diagram, start-up
4.1 System without functional modules
Simple systems with a direct heating circuit do not require a functional module.
4.2 System with FM3 functional module
eBUS
Systems with two heating circuits that must be controlled separately from each other require the FM3 functional module.
The VR 92 remote control cannot be added to the system.
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VRC 720
eBUS
FM3 (VR 70)
VRC 720
Operating and installation instructions sensoCOMFORT 0020287900_01