Hi, I'm hoping someone can tell me what the 2 motorised valves are doing in my pumped heating/hot water system. The 3 way valve is not the original and is a V4073A which I understand controls both heating and hot water in a Y plan. However, there is also a second valve controlling hot water on the inlet to the hot water cylinder. It's a V4043H which is normally closed and opens when the cylinder thermostat calls for heat.
The system works fine, other than a bit of noise when water is passing through the ABV on pump overun after the boiler cuts out after heating the hot water. The noise goes when I manually open the V4043H and I wondered if I could simply keep it open manually if the system is already fully controlled by the V4073A?
I'd appreciate any advice as I'm confused!
Thanks
Steve
The system works fine, other than a bit of noise when water is passing through the ABV on pump overun after the boiler cuts out after heating the hot water. The noise goes when I manually open the V4043H and I wondered if I could simply keep it open manually if the system is already fully controlled by the V4073A?
I'd appreciate any advice as I'm confused!
Thanks
Steve