TonyT Posted January 26, 2021 Share Posted January 26, 2021 Do it at the main flow and return, the heating pumps only push the water about the heating circuit Link to comment Share on other sites More sharing options...
Nickfromwales Posted January 26, 2021 Share Posted January 26, 2021 Are the pump isolation valves all 100% open? Close them fully, then open them fully to be completely sure. Link to comment Share on other sites More sharing options...
gck303 Posted January 27, 2021 Author Share Posted January 27, 2021 16 hours ago, Nickfromwales said: Are the pump isolation valves all 100% open? Close them fully, then open them fully to be completely sure. Thank you very much. They were not quite 100% open. I fully opened the valves and the noise changed slightly and the flow picked up. I am now upto 16-17 l/m when heating the DHW!!! Is this what you would expect with two 15-50/60 pumps running at 'III' with 22mm pipework? Is still seems slow. The ASHP says the max from rate is 25.8 l/m. Or, am I hitting the limits of the 22mm pipework? Link to comment Share on other sites More sharing options...
SteamyTea Posted January 27, 2021 Share Posted January 27, 2021 https://engineering.stackexchange.com/questions/8004/how-to-calculate-flow-rate-of-water-through-a-pipe Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now