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Gary What information did you give Vaillant for them to suggest your heating curve number of 2.3? smokebox

Hailsham I new you'd be the first to spot that boo boo! smokebox

I will forward them separately Thanks! smokebox

To MJN and all I have tried to send a reply to your personal message, but apparently I have to be a friend, or you do! I can't work out how to make friends (a long story tee-hee). Some of the help instructions on using this website are as bad as Vaillant manuals! Can anyone help me in...

Hailsham Thanks for that link! though it does not explicitly want one to use auto bypass in any 'proportional pressure', and I reckon the autoadapt section is a sort of complex combination of the 2 PP operation modes. As often you have given me work to do and calculations which I shall...

Agile Yes, but present issue is pump failure due to poor equipment specs, with inadequate output, and wasteful bypassing! smokebox

Yes, might just do useful thought but slower thwn solenoid actuation, and best of all is dumping hest through an already open circuit/zone as suggested by one of the regulars above. smokebox

Not nly insists on keeping, but may need to get a larger one that should have been specified first off! smokebox I can see I am driving you all crazy!

There is much that should surely be said in and about the Vaillant manuals! smokebox

Hi Picasso A previous poster noted this 'thermostatic,' and it was thought to be a typo for the usual pressure ABV. Interestingly enough on talking to a high level UK Grundfos technician, he did mention thermstatic valve as bypass, thogh for this specific purpose an almost instant response at...

My Lord Where do you find information that the pump will increase speed again if it has shut down to 1 Metre and then meets total closure of zones? I thought it would just churn away fruitlessly! smokebox

My Lord Where do you find information that the pump will increase speed again if it has shut down to 1 Metre and then meets total closure of zones? I thought it would just churn away fruitlessly! smokebox

Agile Haisham and mysteryman etc,! You will all be horrified to find I live on, AND on line with shaky on line connection from hospital. Agile The HE was partially blown by the crafty wiring from the 'expert' professional electrician because he knew better than me, and wired the pump to...

Joemar I have had an experienced vaillant installer today, but these difficult questions were beyond him, though he was very good and helpful in other rather rarified vaillant wiring matters concerning control of the DHW with the VR61 'mixer' as they call it. I have been ill and am to go...

Matt I have a circuit very similar - I was a bit stuck with what exactly to do in your Relay 2, But am undergoing personal cardiac disaster right now and have to go into hospital tomorrow. Been rather difficult to focus. Hopefully will be in touch again Incidentally there are...

Agile, you guys are terrifying me.I hadn't even thought about Frost! Truth is I am a bit ill today and full of funny drugs etc Should be improved tomorrow I hope. Smokebox Brain on Bypass !

matt I had to see Doc this afternoon about own pump failure, but am preparing a drawing on a cheap CAD programme as we speak. I shall be intersted in other solutions when I have submitted! smokebox

Exocet To begin with (largely because of curious instructions I think) it is easy to be frightened off the VRC430. This is especially true off the inconsistent wording in translation, quite apart from the opaque "meanings " and "descriptions" of functions, but actually this is really only...

Damn you! my lord smokebox

Hi Joe, it is very early days for me, but I seem to get better , less cycling, behaviour with VRC 430 and VR81 both in "thermostat" mode, contrary to my initial thoughts. The manual is astonishingly opaque! Trouble is it is too warm just now, and today I am forbidden from fiddling with the...