Vokera Linea 24 Heat exchanger removal

Hi, the heat exchanger on my boiler need cleaning, it looks buried awa
in the back, i have heard that it easily comes out with just removing screws, but looking at it carefully, it look like that there is a pip on the left hand end that screws into it, obvioulsy to remove thi would mean stripping the innards out from the boiler, the right han end connections are just one opne block that does look like that yo remove 1 screw to disconnect it. So has anyone had any experiance a removing the heat exchanger in this boiler, its the earlier model, th 24.
Thanks in advance for any help.
Hugh
-- shug
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shug Wrote:

Clearly you mean the secondary heat exchanger.
There are four rubber o rings that seal this from the rest of th hydraulic assembly. The pressure exerted by the screws is sufficien for it to seal.
Isolate boiler by turning off flow and return and cold feed.
Run the lowest hot tap and leave it open.
Manually hold open pressure releaf valve until all the gurgling stops.
Get something under the boiler to catch the rest.
Undo one screw on the left of the plate heat exchanger and one nut o the right. Rock the heat exchanger untilk seal breaks and remove it t the rear. Place insulation onto new heat ex and reverse the abov procedure
-- Paul Barker
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Thanks, from looking at it, i guess you mean at the pump end, loosen th
screw there (there is also what looks like a bolt next to it that isn fully done up, but looks like 2 water connection, on the right end i has a bolt, between 2 more water connections, i guess thats it, if so will give it a go!
Thanks again.
Hugh
-- shug
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I have taken it off, was very simple, just the 2 screws you said, pu
the garden hosepipe onto the hot water side, water flowed throug nicely, but on the boiler side, hardly anything flowed, tapped it a fe times on the ground, loads of rusty flakes came out of it, every time tapped it the water flow increased too. I do have a slow gradual los of system pressure too, think this may be the cause of it, might be slight leak internally. Question is I have heard of people gettin these for 60, but where from??? The water now runs constantly at 5 deg, even with the temp knob at max, and it doesnt trip out now.
Thanks.
Hugh
-- shug
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shug Wrote:

http://tinyurl.com/6tdwr
52 deg is very good at this time of year, your mains is probably degrees and you only get a 35 degree rise at the manufacturers quote spec, not sure what that is in vokera linea 24 but likely about 9. litres a minute.
I'm not sure when you order from that supplier if you get new o rings I carry loads of o rings and fibre washers (get them at mode engineering shows like Harrogate), more often than not after yo disturb these type of parts you're sorting out leaks
-- Paul Barker
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Paul Barker Wrote:

Thanks for the link, i shall enquire about it, and probably end u getting some 'o' rings from somewhere else!! No leaks ye tho............!
Hug
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shug Wrote:

If there are no leaks you'll be OK, I usually put some High Meltin point silicon grease on o rings if I don't have a replacement. We us it to service multipoint pins (prevents that feature of a multipoin wherein they stay on after the tap is turned off which causes the firs fitting after the heater to melt and you get very wet, or scalded i you're standing next to it at the time).
O rings can be good for re-use but if you can renew them it's alway the best policy
-- Paul Barker
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