Don't think it's the same boiler but I ripped one of these out in the spring Kev, never seen one before. This one was a 'Radation boiler' and it too had a CU HEX.
Also John if you knew what boiler the OP has you would know anything other than minimal fowling in his boiler would be evident by noise etc.
One of a kind boiler heating works on a diaphragm
if it's the one I'm thinking of it's basically an old water heater like the main medway in principle but heats the ch water instead. No electrics just a basic diaphram set up. Very sensitive to poor flow and/or dirt as low water content fabricated copper heat exch. French crap.
Kevplumb ....
Not many about basically it was the original corvec (chaff) water heater with the added safety device of a thermal link on top of the heat exchanger that if it gets too hot it melts and drops the pilot out .
Pump comes on and lifts diaphragm in water section allowing boiler to fire up pump goes off and gas goes off. Cant get anything simpler.
First one i ever saw i thought fek me how has he done this.
Kev did you ever see the old maxol carina gas hot water back boilers fitted with rads. Few and far between as well
Kev.
Yeah 3 rads max same as janus 3 water heaters in WAU , Never thought it was right,
Hated it as an apprentice, you see the carina box in stores and new you would be chopping out a chair brick piles of rubble and old back boiler by hand the next day. No kangos in them days .Deformed right arm muscle from swinging a lump hammer for hours.
The flame modulation seems to be dependent on both flow and temperature. The operation is a bit hit and miss, but basically it works. I've been wondering how they achieved it ever since I first observed its operation. Now I know!
That boy was over 35 years and hadn't been serviced in about ten years.
BTW, that's a big copper HEX you can see, it's been tinned. My mate, who takes away all of my rubbish including any scrap I throw couldn't get it in his van quick enough in case i told him him to leave it
The Corvec has a copper jacket with embedded copper pipes spiralling up from just above the burners to a finned, silver coloured heat exchanger right at the top in the path of the flue gases. On the front there's a grey temperature control stat that can be rotated fully clockwise for igniting the pilot. Temperature control is partly through rather creaky flame modulation, and partly through the stat clicking on and off. The boiler itself has required less intervention over the years than the much more modern (and very reliable) Potterton I had in my last house, though it is very fussy about flow rate and I've had to adjust the bypass valve in late autumn or early spring a few times.
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