Hello All,
First message here. I had a new boiler and unvented hot water cylinder replaced yesterday. Same system as the previous.
I have an S plan system with 2 valves (2 way each) for the HW and CH. I attach a diagram.
The guy fitted also an automatic bypass which goes from the Flow (Boiler Outlet) pipe to the return to the boiler. In the diagram it is represented from the blue line. I think the correct position should be the red line.
The T connection in the Flow pipe is before the pump and I think this is wrong. So the idea to bypass the 2 valves when they are closed is wrong because the 'loop' should include the pump as well. In particular because they told me that the pump can do overrun, so (I was told) when the boiler is off, the 2 valves for HW and CH are off, but the pump still runs to dissipate heat....they told me the pump should run for around 5-10 minutes after the boiler is off. However, since the bypass doesn't start from after the pump, when the pump is in overrun, it still pumping water to the 2 closed valves...so the bypass doesn't really work...
Also, today after 30 mins of boiler ON, after switching boiler off, the pump was overrunning for 3 hours...which is different than 10 minutes.
Now, I contacted the guy and is coming tomorrow to have a look. I am not sure to tell him that I think that this configuration is wrong? Don't want to offend anybody, but paid a lot and would like things working okay and to understand them. Also worried that if I use boiler/pump today again I will risk to burning out the pump?
I have no experience with plumbing. I have just spent 10 minutes looking at the connections in the cupboard and this bypass doesn't make any sense to me.
Can please anyone tell me what they think about it? Am i missing something here? Or is it a wrong configuration? How is it possible to make such a clear mistake?
Thanks in advance
MM
First message here. I had a new boiler and unvented hot water cylinder replaced yesterday. Same system as the previous.
I have an S plan system with 2 valves (2 way each) for the HW and CH. I attach a diagram.
The guy fitted also an automatic bypass which goes from the Flow (Boiler Outlet) pipe to the return to the boiler. In the diagram it is represented from the blue line. I think the correct position should be the red line.
The T connection in the Flow pipe is before the pump and I think this is wrong. So the idea to bypass the 2 valves when they are closed is wrong because the 'loop' should include the pump as well. In particular because they told me that the pump can do overrun, so (I was told) when the boiler is off, the 2 valves for HW and CH are off, but the pump still runs to dissipate heat....they told me the pump should run for around 5-10 minutes after the boiler is off. However, since the bypass doesn't start from after the pump, when the pump is in overrun, it still pumping water to the 2 closed valves...so the bypass doesn't really work...
Also, today after 30 mins of boiler ON, after switching boiler off, the pump was overrunning for 3 hours...which is different than 10 minutes.
Now, I contacted the guy and is coming tomorrow to have a look. I am not sure to tell him that I think that this configuration is wrong? Don't want to offend anybody, but paid a lot and would like things working okay and to understand them. Also worried that if I use boiler/pump today again I will risk to burning out the pump?
I have no experience with plumbing. I have just spent 10 minutes looking at the connections in the cupboard and this bypass doesn't make any sense to me.
Can please anyone tell me what they think about it? Am i missing something here? Or is it a wrong configuration? How is it possible to make such a clear mistake?
Thanks in advance
MM
