Vokera Linea Max issue
- Thread starter AlanCh
- Start date
On a Linea Max ? really ? mate if you have problems removing that cover you should not be allowed near sharp things
What I wrote was attention to other components on that model like expansion vessel ( almost always- ones I looked at- has water air side), auto air vent, main heat exchanger scaling up where primary flow enters the HEX, pinhole on the main HEX, flow isolator blockage on filling loop
Yes Dan some valid points there but none would cause heat leakage to Rads when HW only is on , which the post is about, have you ever seen a Primary heat exchanger scaling in Scotland ? we dont have any hard water areas, never seen any scaling, the heat exchangers do leak at the rear left hand side, the weld pinholes, this is because Vokera changed the manufacturers of the primary heat exchanger many years ago, and the wire used for the weld failed after a few years, sometimes it might be more expensive , but stick with what works
Ian what I posted was in addition to what you posted ie to keep the boiler operational.
Yes. Plenty of times. Where the primary focus water enters the HE, the POC passing through the matrix will deposit green crystals and then black, resulting in total blockage to POC where the blockage occurs. Not the first time I have removed the heat exchanger from the boiler to dislodge the hard scale with a screwdriver to then wash the HE under fast running tap. This is on the air side not the water side as you suspect I intimated.
It is a product of combustion when the hot gasses react with aluminium fins on copper heat exchangers, it is called vivianite, when it blocks the narrow fins then carbon forms as part of the incomplete combustion , hence why part of the heat exchanger will "soot" up, and you get black powder on the heat exchanger, never clean the heat exchanger without safety glasses on, one tiny speck of that in your eye and it is hospital time extremely aggressive, horrible stuff
you are correct @CBW , many older boilers used similar heat exchangers and if not serviced properly then this build up became like a cycle the more blocked they became the more carbon it produced, , same with BBUs, these days companies call a service a poke and go, modern boilers dont suffer the same as the older ones did, but even then you still got lazy feckers who never serviced anything properly
No Dan scaling is a completely different thing, Scaling is caused by calcium build up in waterways,
Scaling. Scaling is a type of fouling caused by inorganic salts in the water circuit of the heat exchanger. It increases the pressure drop and insulates the heat transfer surface, thus preventing efficient heat transfer.
Ok. I accept scale is only from hard water
In my post I used the wrong word, deposit would have been more appropriate till you mentioned vivianite ( not a word I will forget easily - thanks)
so, no scaling, but deposit which is vivianite.
Would agree deposit or Vivianite does reduce efficiency in a boiler if it allowed to build up?
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