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Thanks for the replies guys. Firstly Oilman I misunderstood what you meant by "end switch". So yes there is a wire which is energised when the valve is open and can signal the Esbe valve and turn on the boiler. As stated, this will energise the windings in the Esbe valve which will rotate one...

Many thanks for continuing to help me, The 2 port valve on the DHW is a Boss Therm BZV2 This is from the blurb that came with the valve " When the brown wire is live, valve opens and the auxillary switch closes. When the auxillary switch is closed there is a circuit between the grey and orange...

The bit I really can't get my head around is that the Esbe valve can be open when the wire from the programmer calls for heat , it closes when you energise the wire presumably from the tank stat for DHW Yet there is a condition when it is open for CH and stays open even though you are also...

Hi thanks for the reply . The ref no on the actuator is Esbe 12001100 65M We were able to achieve heating without DHW. Hopefully, the rough sketch demonstrates how I assume the system works Final question , as I said the old boiler utilised 2 switched lives - 1 to turn boiler on for CH...

Firstly many thanks for responding. To answer your queries, this valve was installed with the original boiler and is an Esbe 12001100 65M The old boiler was a Keston c55 and the new one is a Vaillant ecoTec Plus 64 The old system was controlled by a Horstmann 3 channel programmer, there was...

Does anyone have any experience of the above valves? We have a house with very long pipe runs and we have one of these fitted in 42mm pipe. We have been experiencing some problems after fitting a new boiler, as the original had 2 switched lives (1 for CH, 1 for DHW) and we have been trying to...

That is precisely how I wired it Knowing now that it should mimic the functions of the Horstmann I will give it another go when the weather warms up a bit. I won't be very popular if i do it now and we don't have heating. In the meantime I'll try to figure out the wiring and definitely trace...

Hi stem, thank you for your continued interest. Firstly let me confirm I did add a link between the live and the common on 2 & 5 on the heatlink. Are you saying that with the heating off the the heat satisfied also has a voltage, in the way terminal 3 has on the Horstmann. The reason I say...

Ok , I fitted the Nest and it did not work. Leading on from our discussions I found this image of a similar Horstmann programmer and it made it clear to me what the problem is. When the heating is off or when calling for hot water the blue wire carries a live feed which keeps the valve in the...

You are correct there is a separate pump taking hot water to the cylinder That valve was installed when the heating was changed from oil to gas We have 19 radiators but about 20 metres of "trench" heating which is pretty useless. Thanks for all your help, I understand it all a lot more now...

Hi stem thanks again for your speedy and very helpful reply. That is a great point about the separate times for heating and usage of the water. I may well leave the Horstmann in place to carry out that function, because in addition to timing, it has a advance and boost function. I think you...

Many thanks stem for taking the trouble to answer my post, I really do appreciate it. To answer your points yes it is a secondary hot water circulator, I did consider perhaps wiring it in with the hot water but would prefer to have separate control over it. Thank you for the heads up about...

Hi Everyone, Hope you can help me out with this, had a little trouble posting. We have a condensing boiler with a mains pressure hot water cylinder. At present there is no thermostat fitted to the system which relies on TRV's As we have very long pipe runs with have a separate pump for the...