Not all Rads getting hot

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Not all Rads getting hot

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deden56

I have a Glowworm flexcom 24 Kw condensing boiler which was fitted 2 years ago.The prevous boiler was too small 50,00 btu's which I was running 9 rads from.Even with the old bolier I was never able to have all the rads on at the same time.I have tried balancing them with no change.I joined another site which was supposed to supply good tradesmen but the experience was very expensive.They came out after 2and a half hours I was charged £140 for investgating the problem.Then the next time I was told the 2 way zone valve was fitted back to front & I needed a cylinder stat which I did know to be true for safety reasons and they said the cylinder was taking all the heat and that was the reason I couldnt heat all the rads.They said I also needed a 3 way zone valve and a room stat as the temp for the rads was controlled by TRV's only.Because of attitude ,dirty work and 3 leaks caused by them and a total of £340 and unreliability on thier part I decided to cut my losses.I have been told by another plumber who I know Is Gasafe reg'ed that because of my set up I cant have a 3 way valve fitted to this system and he says I should get a seperate zone valve for the water.I think I have a s plan and not a Y I can upload a pic of the piping If anyone would like to see it.Because I have noidea about this I need to know I am getting the correct advise.Any advise is greatly welcome
 
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More than big enough unless your house has no loft insulation and 20ft ceilings :)
 
It is an end of terrace with high cielings.It has a cellar which I have put rock wool between joists and boarded so the lounge does not get the cold from below.
 
deden56 said:
It is an end of terrace with high cielings.It has a cellar which I have put rock wool between joists and boarded so the lounge does not get the cold from below.
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It should be more than big enough! Your installer is the best to ask though as he's the one seeing the job yeh?
 
Here's an update on where I'm up to.

A plumber found system piped up wrong & changed to Y plan with 3 port valve.He isolated the C/H circuit & found restriction in boiler or coil.Temp rises fast on boiler 49 degrees cent to 74 degrees in 40 seconds 9Been told this could be blockage in the heat exchanger )then boiler stops F7 error (Glow worm flexicom 24 kw hx) comes up a lot of clicking while boiler is heating up and cooling down (Not heard this before).The casing on the C/H circ pump gets that hot I cant hold my fingers on it.2 rads have TRV's at wrong end.I have been advised to get a power flush.This boiler has an aluminium heat exchanger I read somewhere that it makes a difference to what you can flush with?
 
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deden56 said:
He isolated the C/H circuit & found restriction in boiler or coil.Temp rises fast on boiler 49 degrees cent to 74 degrees in 40 seconds 9Been told this could be blockage in the heat exchanger )

The casing on the C/H circ pump gets that hot I cant hold my fingers on it.
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Has the pump been checked? The fast temperature rise could be due to a faulty pump, which could be the reason for the very hot pump. In any case the pump is installed incorrectly as the shaft should always be horizontal, not vertical as in your pics. The installer should have drawn this to your attention.

Grundfos say: Pumps should not be installed with the shaft in a vertical plane, as this may lead to dry running of the top bearing, noise and possible pump failure.

2 rads have TRV's at wrong end.
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This is only true if they are one-direction TRVs. If they are modern bi-directional TRVs it doesn't matter which end they go. Look on the metal body of the TRV for one or two arrows. If there is only one arrow the TRV must be installed so the arrow shows direction of flow (towards rad on the flow - hotter pipe, away from rad on return - cooler pipe). It there are two arrows at 90 degrees, it's a bidirectional TRV and can go on either end.

It doesn't matter if a TRV is on the flow or return; all it is doing is controlling the rate of flow through the rad.
 
Hi deden56 ... Sound like your heating system is really struggling to circulate water around it. As said before, without seeing how things are configured its a difficult call regards flushing or re-piping! Really depends on how bad it is. If the concern is with the boiler heatex though they could easily bi-pass flushing the boiler by piping it out. May be an option considering the different ages between boiler and system!
 
The pump was only changed last Monday 24/07/2011 and it is now vertical.
 
The TRV's only have one arrow and the 2 that are wronrg point into the rad but they are on the return side.
 
TRV single arrow.jpgY plan # 1.jpgY plan # 2.jpgY plan # 3.jpgNew Y plan in airing cupboard with 3 way port.TRV with arrow pointing in which is at return end.If you look back you will see old layout under bath.
 
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deden56 said:
The TRV's only have one arrow and the 2 that are wrong point into the rad but they are on the return side.
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Instead of moving it to the other end, the TRV just needs to be turned on its side, swapping over the inlet and outlet. Having the control horizontal is theoretically better as it does not get influenced by the heat rising from the pipe.

Alternatively replace them with modern bi-directional TRVs and keep them on the same end with the head vertical.
 
as a long shot I checked the direction arrow for flow on the C/H pump it was ok
 
I have had a power flush on the advise of a plumber who did the Y plan with no change still have poor circulation.I have a plan of how it is piped and what the plumber who flushed it said.It's an excel file is it possible to upload it to here?
 
diamondgas can you message me with contact email so I can send plan.
 
so many things to check, do they get warm upstairs and not downstairs? Is it that there are some up and some down?? I'd be looking at the pump, whether the by-pass is set correctly or if there's any blockages
 
heat exchanger or coil has been mentioned to me.Is this a clean or change? and how do I check if it is this.The central heating pump is getting very hot and getting F22 fault code Glow worm Flexicom hx 24 kw
 
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if it didnt work before it sounds like you have a problem in the basic design of your system you need two motorised valves and probably a balancing valve on the cylinder get the controls sorted then you can repipe properly sorry failure to read complete thread controls look fine now
 
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call e plumber as mention above you have been given a number to a good plumber ! call him and hi will sort it out for you ! do not leave it till next day summer is nearly over
 
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