Vaillant VR 71 - 4 - Using the functional modules, basic system diagram, start-up; 4.1 System without functional modules; 4.2 System with FM3 functional module

0020288151_04 Operating and installation instructions 27
4 -- Using the functional modules, basic system diagram, start-up
4.1 System without functional modules
eBUS
VRC 720f
Simple systems with a direct heating circuit do not require a functional module.
4.2 System with FM3 functional module
VRC 720f
eBUS
VR 92f
FM3 (VR 70)
Systems with two heating circuits that must be controlled separately from each other require the FM3 functional module.
A remote control can be added to the system.