topping up boiler with low pressure

whiteboard

Hi all,

Bled the rads the other day and the pressure in the boiler has dropped to 0.5b.
Rads are now not heating properly.

Reading & researching this, the suggestion is to top up the boiler but I can't see on my model where/how this would be done.
Glowworm Compact (about 13 yrs old)

Some pics attached of underside in the hope that will help.
Any help appreciated before I look to get someone in.

Ta
Whitey

Robbie.G

whiteboard wrote: »

Hi all,

Bled the rads the other day and the pressure in the boiler has dropped to 0.5b.
Rads are now not heating properly.

Reading & researching this, the suggestion is to top up the boiler but I can't see on my model where/how this would be done.
Glowworm Compact (about 13 yrs old)

Some pics attached of underside in the hope that will help.
Any help appreciated before I look to get someone in.

Ta
Whitey

The place to top up is more than likely in the hotpress your looking for a steel braided hose with valves on the ends or take pics of hotpress pipe work and repost

whiteboard

Thanks Robbie.G,

Not seeing anything obvious.

Pipe at the bottom of the cylinder but I suspect that's not related to the heating but for draining the cylinder

Pics attached.

Could there be a valve somewhere else in the hotpress with a permanent run?

Cheers

Robbie.G

whiteboard wrote: »

Thanks Robbie.G,

Not seeing anything obvious.

Pipe at the bottom of the cylinder but I suspect that's not related to the heating but for draining the cylinder

Pics attached.



Could there be a valve somewhere else in the hotpress with a permanent run?

Cheers

I can't see anything there myself
If you follow the pipework going into cylinder you can see them with various valves and see if any pipe from up high joins into them more than likely it should be 1/2 inch

K.Flyer

Can you take a picture of the pipe work on the right hand side of the hot pressa above the pump, and one of the left side, higher than the last one?

nhg

Could it be that your heating system is fed from a tank in the attic & that tank is empty...

whiteboard

Thanks for all the replies.

Attached are some more pics.

Hopefully this makes some sense.

1. wide shot of hot press
2. shot above the pump; the pipe on the far right (red arrow) runs from the tank in the attic and runs into the tank.
3. shows where the pipe in pic 2 branches towards the cylinder. also continues down into the floor.
4. shows continuation of pipe into tank; There are 2 branches off this which go down into the floor of the hot press.


Jumped up into the attic and there are 2 tanks, both of which have water. each probably more than 3/4 full.

Cheers again

Robbie.G

whiteboard wrote: »

Thanks for all the replies.

Attached are some more pics.

Hopefully this makes some sense.

1. wide shot of hot press
2. shot above the pump; the pipe on the far right (red arrow) runs from the tank in the attic and runs into the tank.
3. shows where the pipe in pic 2 branches towards the cylinder. also continues down into the floor.
4. shows continuation of pipe into tank; There are 2 branches off this which go down into the floor of the hot press.


Jumped up into the attic and there are 2 tanks, both of which have water. each probably more than 3/4 full.

Cheers again

In the last pic the valve that you have marked with an arrow is the heating fill valve and under it is s non return valve
So you have what we call a so sealed system.On that type of system around .5-.6 of a bar is the best you will ever get as its gravity head pressure.if your boilers always been working ok at that pressure you might need to look a bit further into things

whiteboard

Thanks a million for that, at least I know what I have now...
AFAIK the boiler has always been around that 0.5 mark; certainly cant remember anything much higher.

Now to try and figure out whats going on with the radiators; again today, heat on but rads are only lukewarm. The one in the bathroom always seems to be on and thats at a reasonable temp; but thats the only one.

Could you there be an airlock somewhere?

Cheers

whiteboard

further update on investigation

If I turn the radiator in the hallway off; all others then work and heat to the expected temp.

The pipes feeding this rad are cold to the touch whether on or off.

Walter Becket

Sounds like the system needs balancing. Each rad. has 2 valves one used to turn on and off and on the other end one that's used for balancing it has a cap that you can pull off to allow access. If you reduce the flow using this valve you should be able to get the other rads. to heat.

whiteboard

Will give that a go - thanks

Do I do this in a particular order like upstairs and then down?
Is it possible that the hallway rad is the last on the loop?