what is d.0 set to? weather compensation only good if radiators are oversized. Crank the heat curve up insure radiators are balanced correctly hopefully not small bore pipe system. Increase d.2 to 40.
Anti cycling
- Thread starter Grampy
- Start date
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Reset everything else to factory. Apart from your programmer to the ACTUAL desired times and temperatures.
I love these "my bunny is doing weird things and was installed by a muppet" threads 
we always get there in the end.
we always get there in the end.Sponsored Links
On 22 rads there is a good chance that you will need some kind of hydraulic separation.
And if anti cycling blew your mind, this will see you through to the new year
That depends.
Oh great, more stuff I don't understand.
Looks like more Googling for me tomorrow.
You're starting to see why getting a boiler fitted properly makes sense
So seems like system was installed and you have added the vsmart after by your wording? There are a few parameters that need setting correctly and also the simple stat on the megaflo should have been changed out to the valliant thermistor to get the best out of it. Assuming that the vsmart works the same as the older series of controllers. There was also a parameter that elludes me for the time being that can be set so the boiler doesnt request a really low flow temp if the system cannot handle it. But see how d.0 @ 15 goes. With that amount of radiators then as long as balanced well and not that thermostatic valves are closing lots of radiators down then you should be able to get somewhere near. Dont read too much into having a high heat curve the low ones only come into there own if radiators are really oversized so they still give out the required kw at such low flow temps.
Totally.You're starting to see why getting a boiler fitted properly makes sense
Since having my original system installed I've dealt with a few gas safe companies.
They are all nothing but installers. They are not engineers.
The only difference between them and me is they've done the gas safe course, I haven't.
When it comes to sizing boilers, or explaining weather comp they are clueless.
Finding people locally with actual knowledge of this stuff has so far proved unfruitful.
Some of you guys on here actually talk from an engineering point of view not just an installer's fit and forget.
Yes vsmart had been added.
What is the cylinder stat called? Having read some other threads here I think it's the VR10 but that is described as a solar sensor?
Woken up to a hot house today. Before going to bed last night I dropped d.0 to 15.
What other parameters do you think need changing with vsmart?
VR10 is the one that enables smart water heat up. Only really a nice to have as it will control the boiler better during HW generation. So you have noticed a difference already dont go changing anything else apart from your heat curve and see how it goes regarding the cycling and report back.
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