Advice needed. Issues with underfloor heating and hot water system for new build

[Chalked]

Merry xmas
How clean/ dirty was the water when the pump was taken out?

Hope the consultant can sort it

 

[Howsie]

Are you paying for the consultant?

 

[Carrera]

Merry xmas
How clean/ dirty was the water when the pump was taken out?

Hope the consultant can sort it

There was a little rubbish, not much really. Chemical cleaner was being used, then flushed through for quite a while.

 

[Ermintrude]

Like I said before isolate manifolds get flow to cylinder hot, so hot u cat touch , leave hot taps running so that cylinder is full of cool water. Turn on say m1 then wait, once return from m1 ok leve it on and turn on m2 keep going until the flow to cylinder cools so u can hold it.

Temps are relative so just wrap a thermometer in a cloth soaked on veg
Oil on pipe. Just enough cloth to hold bulb against pipe . Oil is just to conduct heat as water will evaporate .
Or buy a flexible plastic ones and stick to pipes , the film types.

Each manifold has it's own pump right? - stupid question but needs to be asked?

I think your plant room needs re configured, 100% LLH with pump set to each circ. cylinder fine , get zone valves fitted on each flow in plant room . Ie to each manifold or cylinder. Shouldn't require any disturbance outside of plant room. I would be fitting an additional boiler or boilers tho . My mind u want at least 70kw for peak demand . Won't say this too loud as not a fan of wb but put same boiler in as what u have or fit multiple new boilers say 2 or 3 ideal logic system 30kw or even two kestons as same boiler but higher output avail.

Don't forget to balance system and lag it properly

 

[Carrera]

Like I said before isolate manifolds get flow to cylinder hot, so hot u cat touch , leave hot taps running so that cylinder is full of cool water. Turn on say m1 then wait, once return from m1 ok leve it on and turn on m2 keep going until the flow to cylinder cools so u can hold it.

Temps are relative so just wrap a thermometer in a cloth soaked on veg
Oil on pipe. Just enough cloth to hold bulb against pipe . Oil is just to conduct heat as water will evaporate .
Or buy a flexible plastic ones and stick to pipes , the film types.

Each manifold has it's own pump right? - stupid question but needs to be asked?

I think your plant room needs re configured, 100% LLH with pump set to each circ. cylinder fine , get zone valves fitted on each flow in plant room . Ie to each manifold or cylinder. Shouldn't require any disturbance outside of plant room. I would be fitting an additional boiler or boilers tho . My mind u want at least 70kw for peak demand . Won't say this too loud as not a fan of wb but put same boiler in as what u have or fit multiple new boilers say 2 or 3 ideal logic system 30kw or even two kestons as same boiler but higher output avail.

Don't forget to balance system and lag it properly

each manifold has its own pump at the manifold not in the plant room. Manifold picture earlier in the thread.

 

[Ermintrude]

each manifold has its own pump at the manifold not in the plant room. Manifold picture earlier in the thread.

Hi, sorry on an iPhone.

Ok so you have zv on each manifold.
Don't like the 4 port blending valves. Difficult to balance. I prefer pump/ manifold return and primary flow. And then a balance-able return. Notice there is no pipe stat to tell the zv when flow is needed. So it's just open when manifold is on? Not much point in it. IMO , should have a pipe stat set on the returns from floor to blending valve and be set so that when flow cools and blending valve opens up for more primary heat and interlocks with boiler or in your case the LLH pump.

Also what is floor construction? Just that there is no conduit on the ufh pipes as they leave the floor? Always try and have 150mm of conduit above floor and 350 is below to protect from mechanical damage.

 

[JusKel]

View attachment 16396
Don it albeit sideways!
this is the plant room setup

If that is the main pump, then why is there a tee between it and the boiler?
Can you remove it and connect in to left side of pump ?
Or maybe move the pump onto the pipe coming directly off the boiler?
(Mentioned previous too)

 

[Jedny]

Any chance of bigger pic

 

[Ermintrude]

Any news?

 

[diamondgas]

Hi Carrera, To get the IR working you can paint the pipe black

Scenarios with testing .... I'd want to know what strain was being put on the boiler, so primary F&R's would be where I'd monitor under as many load scenario's as possible up to max load. If your flow temp drops below 60 DegC it'll start to draw heat out of the cylinders hot water. If the flow temp stays cool for a long time then I'd be pointing towards that being the reason why your hot water isn't getting to temp!

If you haven't already, I'd put the hot water on 24/7 or at least an all day setting....