Any Heating Engineers on Here?

Ive a couple of questions

[lfcrule1972]

My mate is a gas safe engineer, if you want I can see if he'll answer your Q's SfG ?

[Superfly Guy]

My mate is a gas safe engineer, if you want I can see if he'll answer your Q's SfG ?

I have somebody coming around later but il put it up here anyway. I have a normally otherwise working CH system. A single radiator fails to warm up, this rad is in the conservatory that the previous owner had constructed. Funny thing is i had the rad off the wall earlier and water flows freely through it. Whilst off i turned on the pipes and they to allow water to flow through, water that after a few seconds is hot. Its just that when all is connected up it would appear the water is not flowing with the rest of the heating loop. Rad is bled etc.

This lone rad takes it feed from a rad in the kitchen, il post pics later as to the set up, also as this is a very modern house and my last place was about 85 years old the heating system varies massively, ie i now had no header tank and a cupboard full of various cylinders all with nobs on.

[cyclone]

stupid question but is the return valve open.

[Superfly Guy]

stupid question but is the return valve open.

Both valves at either end are open, not a silly question.

[Toxic]

Possibly an airlock in the system. I had one radiator a few years back that done this. Engineer had to loosen the part where the valve meets the radiator. once that was done water started flowing. the other thing is sometimes a Thermostat will fail to open even in the open position. replacing it with a new valve should fix it.

[Superfly Guy]

Possibly an airlock in the system. I had one radiator a few years back that done this. Engineer had to loosen the part where the valve meets the radiator. once that was done water started flowing. the other thing is sometimes a Thermostat will fail to open even in the open position. replacing it with a new valve should fix it.

Its not that mate, water flows freely as i tested it when i had the rad off.

[Toxic]

The only other things that it could be is the Radiator itself has a blockage in the Veins stopping flow or your Pump is not strong enough for the Heating system or is failing. btw is your system a pressurised system?

[cyclone]

I know that all the radiators in the house need to be "Balanced" ,not sure if that is the right word. Using different restrictors in the radiator at the thermostat valve so all of them flow and heat up the same. If the one in question was added later could be that all the flow is going toward the kitchen? Am I making any sense? Really stretching my knowledge here.

[Superfly Guy]

The only other things that it could be is the Radiator itself has a blockage in the Veins stopping flow or your Pump is not strong enough for the Heating system or is failing. btw is your system a pressurised system?

I ran water from the hose and the flow is fine, also the water that ran out when i drained that rad down was clear so sludge isnt a factor. Its a closed system which i believe is pressurised. like i said the water came gushing out of both hoses so the pressure must be fine and the rad immediacy before is fine.

@Cyclone, yes a central heating system needs to be balanced, i did this in my old place and it made a huge difference but this is different, there isnt a steady drop in rad temps, the rad earlier in the loop is only 10 feet away and absolutely redders.

I think the fact this cold rad is an add on as its in the conservatory, it also feeds from the previous rad using a T-pieces, im thinking that as the heating works in a loop and therefore the water must flow around the loop is directional (DC rather than AC) could it be possible that this rad is being fed from both ends rather than fed from one end and removed from the other.

[Superfly Guy]

Am I making any sense? Really stretching my knowledge here.

Same here, im basing the whole thing on what i know about PC watercooling.

[Superfly Guy]

Ok, had an expert opinion.

All the rads use that small diameter pipe which struggles with flow pressure over distance (so im told), the conservatory rad is a fair distance from the rad it feeds from so all of this means that there is insignificant pressure in the system to feed the last rad. Tomorrow morning il close all the rads and balance the system, this worked well in the old house so may work here although there are more rads here and the loop has more ground to cover.

Also the system pressure was a tad low which ive now bumped up to 1.5 bar.

[Rickzayne]

have you tried turned all the other rads off and boosting your boiler forcing the heat to it?

[cyclone]

can you turn up the feed pump? lots of them have an adjustment I had to do that when added radiators and 1.5? standard here in Germany is 2 bar.

[Superfly Guy]

have you tried turned all the other rads off and boosting your boiler forcing the heat to it?

Thats the plan for tomorrow morning.

can you turn up the feed pump? lots of them have an adjustment I had to do that when added radiators and 1.5? standard here in Germany is 2 bar.

It has a blow off valve of sorts which may trigger at 2 bar im not sure, however all the UK based online stuff says 1.5 bar max.