Based on what you said I have taken the front off the controller and found out a bit more about the wiring. It has a nine terminal backplate. Live, Neutral and Earth make up 3 of them. No problems there.
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Some programmers have "volt free" switch outputs. Others have outputs hard wired to V. You can fit a volt free programmer to a V system, but you might not be able to fit a V output programmer to a system requiring volt free contacts. However, most systems are quite happy with the V signalling. Thank you for your help. Based on what you said I have taken the front off the controller and found out a bit more about the wiring.
It has a nine terminal backplate. Live, Neutral and Earth make up 3 of them. No problems there. I have worked out that the first group of 3 terminals is for the CH and the second for the HW. The Live wire is daisy chained to the two "C" terminals.
I think I am right in saying therefore that it a V signalled system. After using my multimeter I have worked out that a circuit is completed between the respective "C" and "ON" terminals whenever the HW or CH is demanded by the controller.
My assumption at the moment is that if the "OFF" terminal gets V then it overrides the connection between "C" and "ON" and breaks the circuit. Probably when the water gets up to temperature.
However, if this is the case, I would have thought the "OFF" terminal for the CH would be connected to the wall thermostat in some way.
It is important to not touch the 2 port valve wiring. The 3 way valve is used to control your system as in many central heating systems. The two port valve is probably a very important safety device that should the Megaflo requires to remain safe. Do not modify the controls to this one. It is an emergency cutout. You may be right here Christian. The two port valve is situated between the three port valve and the Megaflow heating coil entrance. I thought it might be something to do with biasing the boiler output towards the radiators until they heat up, before sending output through the HW heating coil.
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Faejas Share Facebook Twitter Pinterest. Add Your Answer Tips for a great answer: Posted on Nov 14, I thought it might be something to do with biasing the boiler output towards the radiators until they heat up, before sending output through the HW heating coil. Send Close Enter your email to be informed when this product arrives: This Buy it now listing has ended. Honeywell Sts 2 Channel 1 Day Programmer. Just mark the old wires on the old thermnostat If you cancel your paid Prime membership or return the qualifying smartphone within the first 3 months of your paid Prime membership, we may void your Gift Card or charge you in the amount of the Gift Card. Feb 08, Honeywell Electronic Programmable You can homeywell your question or post anyway.
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