Today I finally got round to replacing the 3-way valve body and put a new (but not tested) actuator head on as the old one had visible signs of water damage. The Danfoss port "H" motorised valve series, which includes the HSA3 Actuator, is suitable for use with both copper and iron pipes.

Find links below to useful resources for Drives, Climate Solutions, High-Pressure Pumps, and Sensing Solutions product portfolios. This appears to be the actuator fitted to my Camray 5 Combi 90A boiler, however, the part number in the book is BS 50752. I have removed the existing HSA3 actuator during DIY, but foolishly I’ve lost the 2 fastening screws, so I can’t refit it. The power to start boiler then comes from cylinder stat if HW is involved or the valves orange wire if HW not involved. Wire (2) comes from the CH ON terminal, (goes via junction box) to the input side of the room stat, From the output side of room stat (goes via junction box ) to the white wire of valve.Do you supply these screws as spares or can you let me know the size and type so that I can source them please. My question is, does the HSA3 electrical wiring need to be connected in the junction box to complete the circuit for the CH ? To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The products will work with the majority of heating systems and can be used on new installations or added to existing systems.

I had a faulty actuator which I have now replaced, however I have lost the original wiring diagram that I made when removing the old unit from the junction box in the airing cupboard. I was expecting the orange to become live once the valve had moved to the heating position but that’s not the case. For AC drives please contact your local sales office for fix and troubleshooting by certified service partners.When HW only is selected, the orange will be live as it is backfed from the boiler/pump connection that is fed from the cylinder stat demand contact. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Note the CH and HW will now share the flow of water until one side becomes satisfied (usually HW) when the valve is then supposed to move to CH only. It may be that HW is not on so the grey would not become live and this is where the second source comes in.