Discuss No filling loop and red expansion vessel installed. How to represurrize heating? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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samsg30

Hi,


I need bit of an advice about finding the filling loop in my heating system. Apologies for long description but thought to cover as much so relevant solutions can be suggested. I have spent endless hours searching internet including this forum and everywhere it is mentioned there must be two valves either near boiler or cylinder which is used to repressurize heating after draining and refilling but there isn't any installed at all near existing Megaflow unvented indirect cylinder by Heatrae Sadia or Glow worm Flexicom 30HX system.


Symptoms: -


My radiators were not getting hot enough after running heating for long time and called engineer who just bleeded few radiators and increased the pressure of heating system (which he found after a struggle as he said but I didn't see). He charged me £200 for 30 minutes job which is rip off.


Now within 2 weeks time, I got another plumber to change the radiator and two TRVs for which he had to drain whole heating system. He refilled the system by just turning the cold water supply only as there's no filling loop and pressure meter anywhere in the system to see what's happening. All radiators were bleeded twice and now no more air in any radiators.


When we turned the boiler on, it showed Fault 22 (i.e. low pressure error). We had to reset it twice before error disappeared automatically and heating started working but few radiators were not getting hot at all. Radiators were tested for air again it is fully filled with water as only cold water was coming out. Plumber advised to close some of the TRVs and locksheild which will push the water to other radiators, which did the trick indeed but except two radiators.


Problem: -
Out of 15 radiators, 2 of them are not getting hot at all and I am worried it is down to the water pressure in heating.


Help needed: -
Please if looking at the picture of cylinder, someone could advice if they notice anything which can be used to repressurize heating system. I know all the valves except red valve and the connection line it is attached to. Not sure if this can do any trick.
I have checked the Glow worm Flexicom 30hx system and there are no valves visible at all except one to switch off Gas supply and Megnaclean. I have not opened any face plate to check and won't do it at all as it is boiler system.


Thanks for your help and taking out time to read this.
cylinder - Copy.jpgvalve unknown.jpg
 
This is all which is visible in air cupboard where cylinder is installed. Though this is unvented indirect cylinder from Heatrae Sadia megaflo eco but few pipes (including one cold supply) are going up in the loft area where there's a small tank with no valves as such. I guess this is bottle tank (as per glow worm flexicom hx guide).

Is this correct to assume that this tank will feed the water in cetnral heating automatically to pressure. Is the red pressure valve (show in other picture) controls the pressure automatically?

If yes, it is common for few radiators not to heat up automatically after system draining and re-filling but eventually getting hot if other radiators are turned off?
 
Red valve is a bypass valve, nothing to do will filling pressure. Have you got a picture of the tank in loft?
 
Red valve is an automatic by-pass & should have been set to suit your system so don't touch it!

If there is a small (approx 0.6x0.4x0.5Metre high) tank in the loft with a pipe that connects to the heating system then this is what we call & F&E tank.

If most rads are working then those that aren't are almost certainly blocked with air.
 
I think you have a filling loop? it is a silver hose in your photo of the Megaflo behind the pipe that you call the "cold water inlet 3 bar") it seems to be coming from the cold mains & connecting to the primary "Flow".

Any plumber would have seen that ?
 
Isn't the flexicom hx an open system boiler? The sx is the sealed system one?
 
I think you have a filling loop? it is a silver hose in your photo of the Megaflo behind the pipe that you call the "cold water inlet 3 bar") it seems to be coming from the cold mains & connecting to the primary "Flow".

Any plumber would have seen that ?
Christ you've got good eyes Chris. I am only looking on my phone though.
If you have a tank in the loft it won't be a sealed system. Where is the expAnsion vessel?
 
I think you have a filling loop? it is a silver hose in your photo of the Megaflo behind the pipe that you call the "cold water inlet 3 bar") it seems to be coming from the cold mains & connecting to the primary "Flow".

Any plumber would have seen that ?

That looked like 2 cables to me! :)
 
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