Vaillant VR71, SensoComfort and NetSensor Gateway initial set up

[ScottishGasMan]

Preffered radio link signal is 4 or more. However if it works ok at 2 for you I'd not worry too much, its just very dependant on house structure, and its linked to the reciever not the sensoHOME. (Make sure its north facing, or at least out of sunlight and away from extractors etc.)

Yes, adaptive curve will work up if needed. It never stops, so if the weather gets poor and house taking longer than it wants to hit temperature it will auto adjust every heating run. Same if you add insulation later on it will over shoot and then start working down. Load of algorithims behind it but essentially it just watches how long it takes to heat and how much it overshoots by if it does.

 

[thewickedpickett]

Thanks again. That makes more sense now that I know it connects to the controller on the boiler rather than the sensohome. I’ve seen it as low as 1 but it’s always worked.

Can I ask if you have any thoughts on what’s the best pump setting on the boiler for the WC set up. Mine was on constant pressure default setting. But it was changed by vaillant engineer to constant speed 80%. I know there is a delta t measuring setting too.

 

[ScottishGasMan]

DT setting is most efficient, 20k is what condensing boilers are designed for, however your heating system may not have been.

Other thing to watch is if you have zone valves or not, the pump might sliw the flow rate down below the minimum required to operate the internal bypass. If there's no zone valves and one or two radiators without trvs, I'd set pump to DT and 10-15k. Worst case if system is poorly balanced or designed then can set it back to a fixed speed.

 

[thewickedpickett]

Thanks I’ve no zone valves but I suspect getting an acceptable delta t will be hard. It was originally an oil boiler system with vented tank and quite long flow/return runs 17/18 rads. The house does seem quite hard to heat. It takes a long time for temperatures to rise even when the combi is blasting out 75c.