D.000 partial load auto
D.005 heating target flow temp 51
D.006 outlet tempreture target 50
D.040 flow tempreture actual value 50
D.041 return tempreture actual value 34
D.071 max heating target flow temp 75
If display is 55 degrees on vaillant boiler is that when boiler is at most efficient?
- Thread starter mrbg07546
- Start date
D.005 heating target flow temp 51
D.006 outlet tempreture target 50
D.040 flow tempreture actual value 50
D.041 return tempreture actual value 34
D.071 max heating target flow temp 75
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maybe it’s starting to work as expected now?
That looks more like it with the TRVs, you may find though that pump setting 1 at 53% or 1.97M may not heat all the rads, especially the furthest away ones, so you may, if required, increase to speed 2 at 60% or 2.52M and the TRVs should just throttle a bit more to give the same mean rad & room temperatures, they do take a little time to operate.
Flow/return temps of 50/34C give 34.4% of the rated rads output, as the weather gets colder then the TRVs will throttle up to increase the flowrate, reduce the dT and increase the mean rad temperatures, if one accepts realistically that 6C is the minimum dT then flow/return temps of 50/44C will result in a increased rad output to 44.9%, you can always then increase the flow temp target temp to further increase the rads output.
Presume this is not a combi and has a HW cylinder, if so then the cylinder stat must be set say 5C lower than the target flow temperature, the cylinder is supposed to be heated to 60C once/week for legionella protection.
Flow/return temps of 50/34C give 34.4% of the rated rads output, as the weather gets colder then the TRVs will throttle up to increase the flowrate, reduce the dT and increase the mean rad temperatures, if one accepts realistically that 6C is the minimum dT then flow/return temps of 50/44C will result in a increased rad output to 44.9%, you can always then increase the flow temp target temp to further increase the rads output.
Presume this is not a combi and has a HW cylinder, if so then the cylinder stat must be set say 5C lower than the target flow temperature, the cylinder is supposed to be heated to 60C once/week for legionella protection.
The Flow temp is automatic based on a vsmart. As weather gets colder I just increase heating curve which increases target flow temp. I’ll keep a eye on radiators in the loft Incase I need a bit more. But I suspect it should be ok as it’s a 27kw boiler with 13 rads.
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Are the TRVs "smart" or are they just manually set with some form of programmed "zoning".
They are separate to my vsmart. I have about 5 which are standard Honeywell, hall way doesn’t have one as it’s next to vsmart. And 7 which are blue tooth which turn have a schedule where for example the living room turns off at night. Just to note they are not interfaced with the vsmart.
The heating curve is fine tuned by VSmart, you can set an initial value, but then VSmart will then modify any value you set, as it gains experience of the needs for heat of your home.
Vsmart can set tempreture of cylinder and it always hits that tempreture. Always works well. There is a diverter valve built in boiler. Never seems to be a issue
There is a automatic selection. That chooses 2.5. But I find 1 works well in September. But that 1 I set never changes unless i change it myself
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Mine does too - It is set to fire up a 9:30, and maintain 60C until evening. I have heard the boiler fire up a few times and it always seems to fire up on modulated low burn, until it gets to the 60C. Rather than a diverter valve, mine is an open vented with a 3 port next to the cylinder.
Odd, mine certainly self adjusts.
Interesting. I got a 627 system boiler. Vsmart and a vaillant unistor. I have 14 rads a big 5 bed house. 1960s home. Large windows. Cavity with retro fitted insulation. I am using 26000kwh a year on gas. I do use have a gas job but that’s it. I still expect a bit better.
Vsmart however always get tempreture set very well with little or no spikes.
Why do you need a external valve when there’s one built in?
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