Gas in rads

[SPH]

hi, microbore central heating system are much harder to power flush as the pipework is much smaller, the powerflush works on the basis of flow and with small bore piping you cant always get the flow through the pipes, you may need to change the piping or change some of the rads, or maybe try a stronger chemical to flush the system poss fx2,
hope this helps

www.shawsplumbingandheating.co.uk

 

[SPH]

Hi, microbore piping is much harder to powerflush as the pipe are much smaller, powerflushing works on the basis of flow and with small bore pipes you cant get the flow through the pipes, you may need to replace the pipework or change the rads or try using a stronger chemical to powerflush the system poss fx2 and the header tank should always be removed and cleaned out otherwise the dirt will just re- enter the system, hope this is helpful.
www.shawsplumbingandheating.co.uk

 

[smileyplumber]

John is there any plastic pipework showing on the system do all the rads have TRV's ( thermostatic rad valves ) fitted if so as asked earlyer on by some one has it got a bye pass valve fitted anywhere

if there is plastic pipe how old is it, and is it a barrier pipe ? because none barrier pipe causes oxygen to be obsorbed into the systems water wich i have known to kill a new boiler withing couple years easily . the bye pass is requierd due to TRV's all shutting down as being upto temp this may cause pumping over to happen.
other than that how old are the rad valves maybe one or more could be sucking air in if they are in a negative presure area of the pump . just a few thoughts
plus what colure is the water within the system clear / black / brown etc ?

 

[JohnRMoore]

The pump is not a new one, but even so the plumber did double check the configuration, and did mention about the possibility of pumping over so I assume he checked for that. I'm glad you mentioned about treating the symptoms coz that's what I'm worried about too!

 

[JohnRMoore]

No plastic pipe, and all TRV's except one in the hallway, and there is a bypass with a gate valve on it. The plumber has looked at this, and recommended that I upgrade from a 3 way to 2 x 3 way valves with an automatic bypass. But it used to be fine! The rad valves are 15 years old, I am guessing. However, since the pump is a few centimeters upstream of the cold feed I am assuming this is the only area that could possibly 'suck' in air? I must admit, it is one particular TRV upstairs that makes a lot of noise, and the same rad that gets most gas - but no negative pressure surely? - the F&E tank is in the loft. PS the water is clear with black flecks and occasional translucent 'floaty' bits!