Yes LLH totally removed and piped as if it was never there, pictures addedIs the LLH removed and the boiler flow/return connected as in no LLH?.
Discuss Vaillant boiler taking ages to get to target temperature in the Central Heating Forum area at PlumbersForums.net
Yes LLH totally removed and piped as if it was never there, pictures addedIs the LLH removed and the boiler flow/return connected as in no LLH?.
Downstairs circuit is say 19kw and main one used, thought 20kw would be sufficient. I was trying to reduce gas usage, wouldn’t this just increase it. Could this be the reason for slow ramp up?Why not just increase d.00 to say 30kw??.
I think so, yes.Also looking at the picture, is the LLH connected right way around?
Thank you. I see your point about increasing to 30kw and changing set point, but it will mean output to rads will be less which I don’t want. I think I’ll stick the LLH back in later. That way I know it heats up quicker and the secondary pump has a better head rate.I think so, yes.
Yes I can try that, how long shall I run it before getting d.40/d.41You have a total rad demand (2 zones on) of 33.5kw so how can a 624 service both?.
Before you reinstall that LLH, can you put the 2 zones in service with d.0 at 30kw and just take d.40&d.41.
Also remember that (probably) originally, the secondary flowrate was set up for both zones so, when one zone only in service, then the flow temperature to these rads will be greately reduced leading to reduced output but that is a "feature" of LLHs, it would be useful to install even a clamp on thermometer on the secondary flow pipe at the LLH, you can quickly determine the pump settings for both one/two zones to give optimum performance/economy.
Didn't you install this about a year ago??.
Run them until the flow temp is say 65C.Yes I can try that, how long shall I run it before getting d.40/d.41
I have a clamp on thermometer I can check with once reinstalled.
Yes was installed last year, since then I’ve had additional rads added/replaced
Finally got to 65, it was 65/47W w w w w w,tw,ww ww,r,
Run them until the flow temp is say 65C.
Reply to Vaillant boiler taking ages to get to target temperature in the Central Heating Forum area at PlumbersForums.net
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