Hi, It would be really helpful if someone here can help shed some light on this problem please. The situation is my mother in-law has just moved house and the CH/DHW system is wrong, I am hoping to get it back to some type of functioning system for her. Here is what happens...
The programmer is set to fully pumped it is a RWB9.
The DHW is an indirect cyl in the loft, it has 15mm pipes to the heating coil!
There are NO room / cyl stats in the system.
I know the valve (two way VAL222MV spring closed) has a duff motor and previous owners have set it to manual.
Please see attached picture for plumbing / wiring diagram. I have omitted returns and neutrals etc for clarity.
I know when you look at the wiring diagram you will say that its wrong I know that because you can workout what happens when the programmer is set to CH only!
I just need some help on what the best way to sort this mess out is? I don't really want to do any major changes to the system. I don't really think the system follows any type of plan, the nearest I got to was an old W plan with priority to DHW but with no stats??? Is my best way to fit room / cyl stat, new two way valve and give priority to DHW?
I hope giving the priority to the DHW will heat the water in the cyl, at the moment you obviously have to have the HW on to get the CH to work due to the wiring, you can leave the CH off as the valve is set to manual as it duff! Setting the system to CH only does nothing because the valve motor is duff and the wiring is wrong. So what we have at the moment is when the DHW and CH are on the rads get hot but the DHW stays cold, if you feel the pipes in the loft they hardly get hot, this I put down to the 15mm they are plumbed in! I am hoping fixing the valve and giving priority to the DHW will give enough pressure to actually get the heat to the cyl? If I get chance tomorrow I will test this theory by closing the valve and seeing if the heat gets to the cyl.
Thanks in advance.
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The programmer is set to fully pumped it is a RWB9.
The DHW is an indirect cyl in the loft, it has 15mm pipes to the heating coil!
There are NO room / cyl stats in the system.
I know the valve (two way VAL222MV spring closed) has a duff motor and previous owners have set it to manual.
Please see attached picture for plumbing / wiring diagram. I have omitted returns and neutrals etc for clarity.
I know when you look at the wiring diagram you will say that its wrong I know that because you can workout what happens when the programmer is set to CH only!
I just need some help on what the best way to sort this mess out is? I don't really want to do any major changes to the system. I don't really think the system follows any type of plan, the nearest I got to was an old W plan with priority to DHW but with no stats??? Is my best way to fit room / cyl stat, new two way valve and give priority to DHW?
I hope giving the priority to the DHW will heat the water in the cyl, at the moment you obviously have to have the HW on to get the CH to work due to the wiring, you can leave the CH off as the valve is set to manual as it duff! Setting the system to CH only does nothing because the valve motor is duff and the wiring is wrong. So what we have at the moment is when the DHW and CH are on the rads get hot but the DHW stays cold, if you feel the pipes in the loft they hardly get hot, this I put down to the 15mm they are plumbed in! I am hoping fixing the valve and giving priority to the DHW will give enough pressure to actually get the heat to the cyl? If I get chance tomorrow I will test this theory by closing the valve and seeing if the heat gets to the cyl.
Thanks in advance.
View media item 29493