I have seen plenty on the web, including PDFs of wiring diagrams and alike, for how a 2-port motorised valve works, but it doesn't make sense
I have a pumped gravitiy C-Plan system. This means that I have pumped boiler heated water to my rads controlled by a room stat and the boiler heats the domestic hot water by simply circulating hot boiler water through the HW cylinder
Now, I want to control my DHW as it is getting too hot. So hot in fact that I think it has destroyed a fairly new show pump I installed a while back, but that's another story.
So I have me a 2-port valve (Salus) and a tank stat to go on the cylinder. I also have the Centaur 27 Hortsmann controller
No matter which wiring set up I look at there doesn't appear to be a way of enabling the room stat to turn on both the boiler and the pump.
Take the Hortsmann setup, which seems a good starting point and look at diagram 4:
(I am not permiited to send links yet, so google 'horstmann centaurplus c27' and take the installers guide link that ends - Central-Heating/C21-InstallerGuide.pdf
Not only does the boiler not get called by the heating room stat, it also appears to me that when the DHW is satisfied the grey Live will then be switched to the pump via the white wire and so the pump will run regardless of what the room stat is doing (grey is common on the Salus and appears to be Normally Closed on the white while the valve is closed)
So, can someone please explain what the M-Valve is really doing. I can't see why the boiler cannot run if there is demand from the heating but not the DHW
I have a pumped gravitiy C-Plan system. This means that I have pumped boiler heated water to my rads controlled by a room stat and the boiler heats the domestic hot water by simply circulating hot boiler water through the HW cylinder
Now, I want to control my DHW as it is getting too hot. So hot in fact that I think it has destroyed a fairly new show pump I installed a while back, but that's another story.
So I have me a 2-port valve (Salus) and a tank stat to go on the cylinder. I also have the Centaur 27 Hortsmann controller
No matter which wiring set up I look at there doesn't appear to be a way of enabling the room stat to turn on both the boiler and the pump.
Take the Hortsmann setup, which seems a good starting point and look at diagram 4:
(I am not permiited to send links yet, so google 'horstmann centaurplus c27' and take the installers guide link that ends - Central-Heating/C21-InstallerGuide.pdf
Not only does the boiler not get called by the heating room stat, it also appears to me that when the DHW is satisfied the grey Live will then be switched to the pump via the white wire and so the pump will run regardless of what the room stat is doing (grey is common on the Salus and appears to be Normally Closed on the white while the valve is closed)
So, can someone please explain what the M-Valve is really doing. I can't see why the boiler cannot run if there is demand from the heating but not the DHW