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Hi Whitecrane, I went for the Centaurplus C27 from screwfix at £25. It allows three periods each day to be programmed (and all seven days can be programmed differently) and will control two channels independantly (ie Hot water and CH). It also allows you to copy timings across from any day to another if required (takes the ballache out of programming them all in independantly). You can also set it to switch both channels at the same time (single channel operation) if you have a system that cannot provide CH without heating the hot water for the taps. It also has an 'industry standard' connector at the rear which may allow you to just remove the main part of your existing timer and stick on the centaur unit.
I say 'may' because your existing one may be incompatible. I think the Centaur website has a compatibility list which should help. Hope this helps. I bought the Danfoss C27 and it does not work with my system!
The wiring was ok. The problem is that the Boiler supplies the CH pump and there is a Valve that has to be switched on to supply the boiler. In essence I have what appears to be gravity hot water system and a pumped CH system the C27 can only work with a fully pumped CH and water system. Accounting theory scott solution manual. I'll need to quote from the manual later.
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So the question now is.any idea what programmer will work with a Pumped CH and a gravity hot water system? I'm trying to help out a couple of cash strapped friends! I've been looking at the Horstmann website after reading this thread cause they want to replace a Horstmann 425 Tiara with a Horstmann Centaurplus C27 to get rid of the ticking and to update the look of the thing. Only problem, both say 'easy to install' but Tiara talks about a '9 way standard backplate' and the C27 uses a 'standard 6 terminal wall plate'. It looks from the wiring diagrams that I will need to change the backplate. Also, I'm not a spark but it looks easy enough and I'm used to basic electrics. Do you guys agree that it's a fairly simple task?
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I'm happy to tell them to call in a pro if need be. Lastly, I know you can still buy both and they are about the same price which surprises me bearing in mind that the C27 is digital.
Does the Tiara have any important features that might be lost by switching? Thanks in advance!!