Not all Rads getting hot

[deden56]

Is a 24kw big enough for 9 rads

 

[diamondgas]

More than big enough unless your house has no loft insulation and 20ft ceilings

 

[deden56]

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.

 

[diamondgas]

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.

It should be more than big enough! Your installer is the best to ask though as he's the one seeing the job yeh?

 

[SafeGasInstall]

24 KW combi or system boiler ????

 

[deden56]

24 KW combi or system boiler ????

It's a Glow worm flexicom 24kw hx

 

[deden56]

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?

 

[doitmyself]

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.

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.

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.

 

[diamondgas]

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!

 

[deden56]

The pump was only changed last Monday 24/07/2011 and it is now vertical.