We're having a viessmann 100 compact boiler fitted to an existing s-plan system which is currently controlled by a programmable room thermostat and a timer for the hot water. All but one radiators have TRVs and, all in, the system works pretty well with the thermostat keeping a relatively constant temperature in the house as it switches the system on and off. Being programmable, we set the temp we want for each time of the day and now leave it alone. Difference in room temps are evened out reasonably well by the TRVs.
I'm considering the viessmann weather compensation system as described below but am not sure how much of an advantage it is really likely to give:
http://www.viessmann.co.uk/etc/medi...e.File.tmp/6pp Viessmann weather comp web.pdf
At the moment, the room thermostat will tell the boiler when to fire and then (presumably) once the water in the system gets up to temperature, the boiler will modulate its power output down to the required level to maintain the desired flow temperature.
Once the house is up to temp, the room thermostat will obviously switch the boiler off. This seem so to work pretty well to me.
Can anyone explain what advantage the weather comp scheme will add to this? The flow diagram in the link above describes a scenario where the boiler runs continuously with its output power determined by the external temperature of the house. It does does not mention a room thermostat at all. Does this mean that weather compensation works best without a room thermostat and instead relies on the TRVs on each rad to set the desired temperature inside the house?
Cheers,
iep
I'm considering the viessmann weather compensation system as described below but am not sure how much of an advantage it is really likely to give:
http://www.viessmann.co.uk/etc/medi...e.File.tmp/6pp Viessmann weather comp web.pdf
At the moment, the room thermostat will tell the boiler when to fire and then (presumably) once the water in the system gets up to temperature, the boiler will modulate its power output down to the required level to maintain the desired flow temperature.
Once the house is up to temp, the room thermostat will obviously switch the boiler off. This seem so to work pretty well to me.
Can anyone explain what advantage the weather comp scheme will add to this? The flow diagram in the link above describes a scenario where the boiler runs continuously with its output power determined by the external temperature of the house. It does does not mention a room thermostat at all. Does this mean that weather compensation works best without a room thermostat and instead relies on the TRVs on each rad to set the desired temperature inside the house?
Cheers,
iep