Megaflow and Central Heating

[QuickQuestion]

Hi,

Can somebody tell me whether the central heating radiators are under pressure when the system comprises of an unvented cylinder, like a megaflow, or is it separate?

Many thanks in advance.

 

[mickyg]

seperate

 

[QuickQuestion]

seperate

Thanks Mickyg. Just as I thought. I had also just seen a post on another thread sort of confirming this.

Does this mean the CH system will be vented with header tank etc?

Thanks again for your quick response.

 

[lagunaglen]

It depends if you have open vented boiler or sealed system and if its a direct or indirect system .
Your question is a bit vague,what are you planning to do?

 

[QuickQuestion]

It depends if you have open vented boiler or sealed system and if its a direct or indirect system .
Your question is a bit vague,what are you planning to do?

Just changing a couple of radiator valves for a friend. I am familiar with combis and unvented indirect systems, as I have installed lots of rad before. Never had to drain down a system with a megaflow. That's why I wondered if the rad system was pressurised, like a combi system.

Thanks.

 

[mickyg]

just treat it as you would any other system.

 

[Agile]

It may or it may not be pressurised!

I dont think you have sufficient experience to be doing that kind of task safely.

If you got it wrong you could face a claim for a lot of damage!

Do you have insurance cover?

Tony

 

[QuickQuestion]

It may or it may not be pressurised!

I dont think you have sufficient experience to be doing that kind of task safely.

If you got it wrong you could face a claim for a lot of damage!

Do you have insurance cover?

Tony

Thanks for your concern Tony. I am a capable guy, have done lots of plumbing on different systems, but have not worked on a megaflo system before. Have worked on combi systems and vented indirect systems plenty of times, so rest assured I will not be pumping the system up till it bursts! Just wanted to know if the heating system would be pressurised like the unvented hot water system.

Thanks anyway.

 

[Agile]

Some BG engineers thought they were capable, over 20 years in their trade etc.

They managed to leave a Powermax boiler unsafe and the lady tenant was killed by CO poisoning!

Tony

 

[mickyg]

just treat it as you would any other system.

and ignore tony .......a couple of rad valves are unlikely to cause any deaths

 

[QuickQuestion]

Ended up re-packing the valves. Didn't need to drain down.

Thanks anyway.