Can I cap off a radiator circuit

[sb1202]

Howdy,

 

I'm prepping for installing UFH and was wondering if it is ok to cap off a radiator circuit as per the diagram. The boiler is in purple and I'm presuming the pipes run along the length of the hall and tee off into the smaller extension part of the house. I've taken up as much boards as I can and this is the pipe layout as far as I can tell.  

 

Cheers for any help.

[sb1202]

Anyone able to answer this? 

[G and J]

If you close the valves on the rads affected by capping off at the point indicated does the system run ok?

 

Are all those rads on trvs? Iris one or more of them permanently open, indicating that they are the system bypass in case all other rads/trvs are off. 

[sb1202]

1 hour ago, G and J said:

If you close the valves on the rads affected by capping off at the point indicated does the system run ok

Yeah, the rest of the house works fine

 

1 hour ago, G and J said:

Are all those rads on trvs? Iris one or more of them permanently open, indicating that they are the system bypass in case all other rads/trvs are off

None of the rads in the entire house are on TRVs. They're all column rads with manual valves.

It's a Navien Oil combi that was installed about 2 years ago. I'm presuming when they installed it, the added an automatic bypass valve as the manual says "An automatic bypass with a flow rate of at least 6 l/min must be installed (as far away as possible from the boiler) if radiators with thermostatic valves have been connected to combination boilers and in front of any motorised valves for system/regular boilers."

(Thanks for replying by the way)

Edited Thursday at 01:30 by sb1202
adding stuff

[G and J]

7 hours ago, sb1202 said:

None of the rads in the entire house are on TRVs. They're all column rads with manual valves.

Crumbs!

 

I think if I were in your shoes I’d want eyes on the bypass valve anyway for my own piece of mind, regardless of the UFH and certainly before I chop the circuit, but I do have a tendency to overthink.  I find it difficult to believe that a bypass will have been shoved under a floorboard in the wing you are isolating, but that doesn’t make it impossible.  
 

If you are putting UFH in that wing I presume you’ll be having all the floorboards up anyway so you’ll find out.  
 

Anyway, I’m used to systems where all rads bar one can turn off with a trv OR all rads can turn off and a bypass is fitted.  Maybe whoever fitted the system left instructions always to leave at least one rad open.  Assuming you’ve only got one pump then as long as you are leaving other rads open I can’t see why isolating the wing would be an issue.  But then, every day is a school day.   Just don’t try it on Xmas eve lol, just after all the merchants close. 
 

 

[sb1202]

4 hours ago, G and J said:

Crumbs!

I know, but we've made a huge saving on our oil use. We were using around 3500L a year and are now at around 2200L a year and even the plumber who services the boiler was impressed. We moved in 3 years ago. The house had a 25 year old boiler & panel rads with trvs throughout. We upgraded the boiler and this saved us a lot. During a decoration, we replaced a few of the panel rads with column rads which came with manual valves and we noticed a huge difference in warmup and comfort levels. I also noticed the oil use dropped. We took the plunge and replaced all the rads with columns and our oil use dropped significantly. 

 

I've removed the floorboards and it's teed off the main circuit.

I've checked the boiler room and there is a bypass valve beside the boiler. I presume this is where the return comes in. (I'm no plumber by the way, ust learning this stuff as I go along)