Mon, 15 Jun 2026 13:26:45 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=145964#Comment_145964 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=145964#Comment_145964 Mon, 14 May 2012 13:47:44 +0100 Sigaldry
One set of SAP software I use seems to allow all three together and gives a benefit, but the other software I use doesn't allow the delayed start option with time and temperature zone control. Not sure which set of software is wrong.

Appreciate any feedback...]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=145970#Comment_145970 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=145970#Comment_145970 Mon, 14 May 2012 14:24:28 +0100 CWatters
The delayed start alters the time when the heating switches on. It depends on the stat knowing how fast the room will heat up, and the current temperature, so it can calculate how long before the set time it should start the boiler.

Weather compensation changes the flow temperature and that will change the warm up rate. So the calculated delayed start time will be wrong. I think.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=145975#Comment_145975 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=145975#Comment_145975 Mon, 14 May 2012 15:22:13 +0100 Mike (Up North) Yes I agree. They are 3 different things trying to control 3 different requirements so if not integrated properly will fight against each other.
Time & temp control just means for example bedrooms upstairs only demand heat (19 deg) after say 8pm whilst downstairs might be 20deg from 6 pm. This is achived with zone located time programable thermostats and zoning valves.
Delayed start or optimistaion will try to avoid overshoot (or under) by starting the heating at the optimum time to achieve say 20 deg at 8am, If the weather goes cooler it can start earlier, or delay if its warmer. This is a comfort thing as much as anything else.
The weather compensator will incraese or decrease the water temp in the rads in line with the outside temp. The heat delivered will decrease to maintain a constant temp as the bulding and outside warms up through the day, so the delivery temp is gradually reduced.

Cheers, Mike up North]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=146070#Comment_146070 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=146070#Comment_146070 Tue, 15 May 2012 13:07:35 +0100 djh https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=146079#Comment_146079 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=146079#Comment_146079 Tue, 15 May 2012 15:36:43 +0100 Sigaldry
I know from BRE SAP 2012 discussion papers, there's some thoughts that heating controls not necessarily always providing the expected benefits. I suspect that may be from lack of understanding from users and some installers (as well as specifiers).

Anecdotally I've heard tales of complicated high end control systems and high efficiency heating systems made a mockery of by people just setting thermostats to 28°C all day and overriding programmers and controllers.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=146090#Comment_146090 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=9072&Focus=146090#Comment_146090 Tue, 15 May 2012 18:00:13 +0100 DamonHD
Rgds

Damon]]>