The gate valve has a square spindle. Is it really OK to run the pump with its output completely blocked?Mike,
Word of caution re shutting the pump isolating discharge valve, if its like the one shown, do NOT shut it as its more than likely that it will leak, if it has a spindle with a square on it where you can open/close it with a adjustable spanner or such, then OK.
Sadly I've run out of time to do this as we're going away shortly and the other jobs are piling up. I may just give up on weather compensation altogether and put the old (VRT 392f) controller back, at least until next winter.But still run test with pump discharge valve opened but all zone valves shut, then on say speed 2 & 3 slowly increase the ABV index until the power decreases to its minimum, then increase it again until the power just starts rising, at least this might give some indication of what head the pump is actually running at.
The heat curve I chose is typical for a 50 year old house in the UK.
Not with this controller, that's a feature of the newer ones.I think, from memory - that the heat curve will gradually modify it's value, and do so constantly.
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