Expansion position heat only boiler

[Matt0029]

Thanks I may ring technical to confirm the preferd position of the pump. I did notice on there drawing the expansion vessel is positioned so it can be isolated from the boiler by the boiler isolation valves. Guess this is acceptable then?

 

[John.g]

I think it should always be possible to isolate the EV, as long as the PRV cannot be isolated then there is no safety issue, IMO.

 

[Matt0029]

I think it should always be possible to isolate the EV, as long as the PRV cannot be isolated then there is no safety issue, IMO.

Thanks as long as the prv can't be isolated from the boiler it won't be.

 

[Matt0029]

I did wonder if it makes a difference with the pump on the manufacturers diagram. Being a pump to take the water to the low loss header then taken of this with other pumps for each zone. This installation is just one pump for the system no low loss header.

 

[Matt0029]

Looking at either of those type of set ups now.

 

[John.g]

I did wonder if it makes a difference with the pump on the manufacturers diagram. Being a pump to take the water to the low loss header then taken of this with other pumps for each zone. This installation is just one pump for the system no low loss header.

What is the proposed pump make/model if available and how many zones?

 

[king of pipes]

I did wonder if it makes a difference with the pump on the manufacturers diagram. Being a pump to take the water to the low loss header then taken of this with other pumps for each zone. This installation is just one pump for the system no low loss header.

 

[king of pipes]

Just add your filter below the right hand isolating valve Matt. Cheers kop 👍

 

[Matt0029]

Just add your filter below the right hand isolating valve Matt. Cheers kop 👍

The filter after the pump on the return do you mean?

 

[king of pipes]

The filter after the pump on the return do you mean?

Lower down Matt before the pump 👍

 

[king of pipes]

Lower down Matt before the pump 👍

 

[Matt0029]

Sorry do you mean kind of like that?

 

[Matt0029]

That's what we're fitting apparently the instinct heat has been discontinued.

 

[king of pipes]

Sorry do you mean kind of like that?

Yes mate that will work 👍 don't forget a auto bypass for the pump over run when your zone valve is closed . Kop

 

[Matt0029]

Thanks yes

 

[Matt0029]

At 34 rads I was thinking of a 35litre expansion vessel. Was thinking roughly 8 rads for a 8litre vessel on a combi. But due to the high kws of the boiler I take it a 50litre would be better?

 

[king of pipes]

At 34 rads I was thinking of a 35litre expansion vessel. Was thinking roughly 8 rads for a 8litre vessel on a combi. But due to the high kws of the boiler I take it a 50litre would be better?

Here you go mate go with 50 litre vessel all the best . Kop

 

[ShaunCorbs]

1l per rad is more than enough

 

[Matt0029]

Thanks for the help everyone! Noted the locksheild valve on the expansion for servicing as long as I make sure it can't be closed without tools.

 

[ShaunCorbs]

and a drain off after the valve