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What was the old pump like eg in the outlets of the pump any blockage or was it clean and around 15mm dia ?
What was the old pump like eg in the outlets of the pump any blockage or was it clean and around 15mm dia ?
Hi John. Thanks for all the information you have provided. This is a steep learning curve for me as I am a complete layman and unfamiliar with the terminology and power ratings etc. But this is what I do know:What is the boiler power and is it a modulating boiler?
How many rads?.
IF the UPS3 is working properly then CCII is more powerful than CC3 was on your old 5M selectric.
The UPS3 on CCII will maintain +5M up to a demand of 1.1 m3/hr, 18.3LPM.
Also, there should be little or no delay in pump startup after changing settings.
Is the system clean as very dirty systems can build up magnetite on these pump rotors which can slow them down or stop them, the pump head can be removed for cleaning.
Boiler is Potterton Netaheat 50e which Google tells me is max. 14.65kw output
We have 10 radiators in all, smallest 72cm, largest 180cm
4 radiators + heated towel rail upstairs
3 long + 2 short radiators downstairs
The engineer drained, refilled and added inhibitor and fitted new valves with the new pump and 3-port valve.
When we put the pump back into CCIII after everything switched off on CCII last night the pump was ‘throbbing’ and making a ‘thrum-thrum-thrum’ sound as it was running. We left it for a few minutes to see if it would return to normal. It didn’t so we turned it off. This morning there was a lot of gurgling and ‘ticking’ but it is now running on CCIII as before. All radiators are hot. The resonating noise is back.
Many thanks again.
Stephen