Hi,
I recently had the Vaillant weather comp VRC720f and VR71 fitted to my hot water tank, radiator circuit and UFH downstairs (run via heatmiser). My aim is to run the boiler on modulation at a low temperature. I've figured out I can heat the home well on a minus temp day at a flow temp of 45 degrees. I've set up the controller to a curve of 0.8 which seems to cater for this. This issue I'm having is that when the actual temperature is above the desired temperature, the boiler is still firing at 45 degrees. When the target flow temperature of the rad circuit is 32, the actual flow hits 34/35 and the boiler flame is still lit at 40 odd degrees. I'm assuming the settings are wrong somewhere, but would like help if anyone has any experience of this. Thanks
I recently had the Vaillant weather comp VRC720f and VR71 fitted to my hot water tank, radiator circuit and UFH downstairs (run via heatmiser). My aim is to run the boiler on modulation at a low temperature. I've figured out I can heat the home well on a minus temp day at a flow temp of 45 degrees. I've set up the controller to a curve of 0.8 which seems to cater for this. This issue I'm having is that when the actual temperature is above the desired temperature, the boiler is still firing at 45 degrees. When the target flow temperature of the rad circuit is 32, the actual flow hits 34/35 and the boiler flame is still lit at 40 odd degrees. I'm assuming the settings are wrong somewhere, but would like help if anyone has any experience of this. Thanks
