Airlock upstairs on fitting new boiler

Calahonda52

All rads downstairs working.

Upstairs rads and DHW cylinder heating coil not working.

flow and return go under the floor from outside boiler room and I don't know where the upstairs circuit starts, may be under the DHW cylinder

2 bar pressure in the system

The bathroom rad is full of water when I bleed it

There is an air vent on a tee off the DHW heating coil in hot press

All suggestions welcome.

Thanks as always

Pinoy adventure

There is a vent on the pump above the gas boiler.

Wearb

What type of boiler?

jimf

turn off the downstairs rads

Calahonda52

https://www.boards.ie/discussion/comment/119837607#Comment_119837607

Grant Vortex outdoor oil 21-36 kW

Sealed system

Wearb

https://www.boards.ie/discussion/comment/119838547#Comment_119838547

They can be a hoor to bleed. Let off a few litres from the safety valve, run it for a while (a day or until it stops on high temperature) and repeat.

Because of the way the circulation pump is fitted, the air seems to gather in the top of the boiler.

Once you get rid of that, it'll be easier to get rid of the air in the rads.

BTW you could be dealing with scalding water from safety valve.

Perhaps some of the other experienced lads on here will have some tips....

Be sure to keep the water pressure up while doing above.

Calahonda52

Pump is external, didn't come with system,

Primary heat exchanger is empty of air.

all downstairs rads are fully bled

Calahonda52

https://www.boards.ie/discussion/comment/119838539#Comment_119838539

This solved the problem, lots of air in a few upstairs, but will bleed them in the morning

Calahonda52

So, after working done for 3 weeks, upstairs rads didn't come on this morning, OH not happy

Pressure is 2 bar

Any thoughts?

jimf

do you have motorised valves fitted

Calahonda52

https://www.boards.ie/discussion/comment/119958134#Comment_119958134

No, all one zone

10-10-20

Are you still thinking it's air-locked? I presume not?

Did it come on when triggered manually? Did the burner have a high temp alarm or can you tell?

Calahonda52

Turned off the downstairs rads and it came on upstairs and is now working as before, all over the house so there may have been some air in it, need to change an air vent in hot press which may be sticking

10-10-20

Maybe you also have an air-leak and pump pressure issue (such as a balancing problem) and it's not moving the air into the rads where it can be vented. Just a thought.