vaillant 831 plate heat exchanger

[lg plumbing and]

hi everyone

went to replace plate heat exchanger today but the screws would not budge,they are now slightly sheared any ideas or thoughts how to get them out ,much appreciated

 

[buckley plumb]

hi everyone

went to replace plate heat exchanger today but the fxxking screws would not budge,they are now slightly sheared any ideas or thoughts how to get them out ,much appreciated

seen some screw extractor bits you put into drill and put into reverse and they are supposed to remove damaged screws but never used them. i sheared the bolt when removing a pump on a baxi 105 instant and had to drill it out

 

[lg plumbing and]

bought some of them from screwfix today,left hand drill bits gonna try them tomorrow,cheers bud

 

[vern]

hi everyone

went to replace plate heat exchanger today but the fxxking screws would not budge,they are now slightly sheared any ideas or thoughts how to get them out ,much appreciated

Spray with plus gas available from halfords etc.....leave to soak, dry residue.....heat with blow lamp on a small flame using heat mat to protect surroundings ....they will fall out!

 

[lg plumbing and]

thanks mate had never heard of plus gas,will be buying some tomorrow!!

 

[vern]

thanks mate had never heard of plus gas,will be buying some tomorrow!!

It is used in the auto trade for removing seized spark plugs from cylinder heads etc.....and many more uses, do not confuse with WD40 totally different products.

when you heat the 4 bolts as hot as you dare (obviously remove stat off the plate heat ex etc) let them cool for 20 seconds before attempting to undo them, as the metals cool at different rates this causes the surface tension to fall, meaning they will fall out!

 

[lg plumbing and]

cheers bud,will def give that a try tomorrow,wish i never got involved

 

[vern]

cheers bud,will def give that a try tomorrow,wish i never got involved

Yep I know what you mean......good luck all the same

 

[lee gas]

hey all done now ( had to change my username etc to set up new account) got some plus gas and a screw extraction kit from local tool shop and omg the screws fell out HAPPY DAYZ thanks for all the advice

 

[stegas]

Will this plus gas work on the wifes knickers?

 

[lee gas]

gonna try in a mo keep u informed lol

 

[vern]

hey all done now ( had to change my username etc to set up new account) got some plus gas and a screw extraction kit from local tool shop and omg the screws fell out HAPPY DAYZ thanks for all the advice

Lee I gather you did not need screw extractor? Job done well done

 

[lee gas]

hi vern i still needed the extraction kit,the heads on the bolts were so sheared ,the kit is made by trend and it cost about £16 but mate well worth it

 

[lee gas]

by the way does anyone know what the warranty on a plate heat exchanger in regards to scale,this one is 4 years old and had a magnetic scale reducer fitted,but it is totally blocked solid .lee

 

[vern]

hi vern i still needed the extraction kit,the heads on the bolts were so sheared ,the kit is made by trend and it cost about £16 but mate well worth it

Sounds good, never needed one ........yet lol, never failed with PG and or heat.

 

[stevetheplumber]

blocked with scale on the hot water side or blocked with black on the heating side ?

 

[chris watkins]

by the way does anyone know what the warranty on a plate heat exchanger in regards to scale,this one is 4 years old and had a magnetic scale reducer fitted,but it is totally blocked solid .lee

Which only goes to prove, once again, that they don't work !
Never mind BG these are the best rip ever, no moving parts, cheap to produce, carry on doing nothing for years unit scale builds up & then they say must be too fast a flow rate. What a wheeze.

 

[vern]

Which only goes to prove, once again, that they don't work !
Never mind BG these are the best rip ever, no moving parts, cheap to produce, carry on doing nothing for years unit scale builds up & then they say must be too fast a flow rate. What a wheeze.

I must admit to being sceptical too Chris.....all down to the mains water quality and hardness IMHO

 

[lee gas]

good evening gents totally scaled up rather than sludge at first i thought it might be sludge but once taken out blocked solid with scale

 

[stevetheplumber]

good evening gents totally scaled up rather than sludge at first i thought it might be sludge but once taken out blocked solid with scale

if you still have it saw it in half and show us a picture im yet to see a plate thats scaled other than realy ancient ones

 

[vern]

Yep do this....then you can still weigh it in lol