Recent content by Mboursnell

I can't see the temperature in the VRC470f so assume I have only a cylinder thermostat.

I can set the temperature by using either the original thermostat on the tank, or by using the VRC470f. I have tested to see which of these work by setting one to high and the other to low. It seems that both affect the temperature. If you set either to 40C whilst the other is set at 60C, you...

Maybe someone should start a Wiki about how to use a Vaillant VC470 on: //www.diynot.com/wiki/plumbing It would be really useful to have a clear set of instructions that explained how to use each of the settings. :?

Maybe the different behaviours are due to different heat curves? Perhaps with a high heat curve you get more overshoot of the desired temperature. Does anyone know what an "Adaptive Heat Curve" is?

So "modulating" and "thermostat" both use the outside temperature. What exactly is the difference then? Are you saying that "thermostat" only uses the OT when the desired room temp hasn't been reached, but that "modulating" uses it all the time? That doesn't make a huge amount of sense to...

Thanks. So if the installer used the existing cylinder thermostat it will still feed the temperature back to the boiler, so the boiler can shut off when the desired hot water temperature is reached? The only disadvantage is that you don't see the temperature on your VRC470f (not a big...

Thanks. So if you use "thermostat" then you have no weather compensation?

I have a Vaillant VRC470f and an ecoTec plus 428. When I look at my "Cyl. Temp. Current" it says zero degrees. Does that mean the cylinder thermostat is not wired up correctly somehow, or is there some setting I need to change?

I'm not sure. Where do you check to see if it's set to modulating? What does that mean? We currently have it set on all day.

OK, thanks. That's useful. The reason I ask is that ours seems to be OK during the day, but in the evening the house gets too hot. I'm not sure how to deal with that. Where is the best source of clear instructions for programming a VRC470?

Can anyone tell me whether it's possible to set different desired temperatures for each of the three time periods, using a VRC470?