D D DIYnotBot 25 Jan 2010 This image is referenced in the forum thread 'Weird Heating System - How Do I Change To S Plan'
D D DIYnotBot 26 Jan 2010 This image is referenced in the forum thread 'Will These Changes Make My System An S Plan?'
D D DIYnotBot 26 Feb 2010 This image is referenced in the forum thread 'Converting Old System To S-Plan - Do I Need A Bypass?'
