Vaillant VRC430 in lounge using VR81 as thermostat

[c5000052]

I have a vrc430 which is mounted in one room, near the boiler, but I want my vr81 to be the thermostat that controls the room temperature, and not the thermostat in the vrc430.
How do I achieve that ? What setting should I set on the vrc430 between thermostat, modulation, or off .?


thanks