Evohome already offers OpenTherm - which does indeed adjust the CH temp based on the zone demand %.
Heating Partial Load
Collapse
X
-
Originally posted by rarrarrar View PostBoiler max anti-cycle time D.002 is set to 6 mins ( default is 20)
EvoHome has min burn time of 3 mins and 6 cycles per hour.
Although short cycle times are in-efficient , in a large Victorian house with not great insulation and individual room controls waiting 20 mins before heat comes through is not acceptable.
Comment
-
-
has anyone figured out evohome opentherm r8810 with a worcester boiler yet? tried the nefit converter couldn't control the boiler firing so went back to bdr91. I too was trying to improve cycling/efficiency I've since changed some settings and seeing how it goes.
Comment
-
-
Originally posted by Wlife View Posthas anyone figured out evohome opentherm r8810 with a worcester boiler yet? tried the nefit converter couldn't control the boiler firing so went back to bdr91. I too was trying to improve cycling/efficiency I've since changed some settings and seeing how it goes.
This all worked quite well, till I figured out how to get the R8810 to fire the boiler directly.
Comment
-
-
Originally posted by bruce_miranda View PostWith the nefit converter are you able to see variable Target Flows being set for the boiler based on OT? Because the work around which I previously used when I too couldn't get my Vaillant to fire with the R8810 was to set up the system with OT for boiler control and then a 2 zone valve configuration on Evohome. So Evohome would open the CH Valve using a BDR91 and then I would use the zone valve micro switch to fire the boiler, while the R8810 was dynamically setting the Target temperature.
This all worked quite well, till I figured out how to get the R8810 to fire the boiler directly.
Yes I could see variable flow targets on the boiler display and it wouldn't continuously climb as it does with the bdr91 controlling it.
Forgive my lack of knowledge my setup is a combi I do not have any zone valves I am using hr92s on rads. I am open to adding the zone valve it seems a good workaround are their any drawbacks to this method?
How did you get your boiler to fire directly with the R8810? my boiler is a WB life 8000 combi.
Would you say the CH/Evohome is working better now via opentherm, I read the financial savings are slim but even from a comfort/function point of view it must be better.
Comment
-
Comment