Danfoss HSA3 3-Port Valve Actuator

Product Information

To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. When HW gets satisfied the cylinder stat breaks contact to boiler and switches power to the satisfied terminal of the stat. I'd normally expect the orange to become live and connect to the boiler switched live but the diagram suggests the orange is just HW. It may be that HW is not on so the grey would not become live and this is where the second source comes in.

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. For the last few weeks I have had the 3way valve actuator wiring disconnected and have just been using the system for hot water. Do you supply these screws as spares or can you let me know the size and type so that I can source them please.

The Danfoss port "H" motorised valve series, which includes the HSA3 Actuator, is suitable for use with both copper and iron pipes.

The products will work with the majority of heating systems and can be used on new installations or added to existing systems.This is a rare situation, however, if this does happen our objective is to make the process as efficient and easy as possible.

For AC drives please contact your local sales office for fix and troubleshooting by certified service partners. Wire (1) comes from the HW ON terminal, (goes via junction box) to cylinder stat, then across the stat, then from cylinder stat (via junction box ) to boiler/pump. I have removed the existing HSA3 actuator during DIY, but foolishly I’ve lost the 2 fastening screws, so I can’t refit it. Danfoss controls are central heating system time and temperature controls manufactured by well know controls company Danfoss.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. 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. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. This appears to be the actuator fitted to my Camray 5 Combi 90A boiler, however, the part number in the book is BS 50752. normally this is fed from the HW off terminal in the programmer and the satisfied contact on the cylinder stat.

I'm going to double check the two valve heads that I have, to make sure I haven't missed something, but I expect them to both to be faulty. While doing this a second micro switch allows power out of the valves orange wire to re start the boiler. My question is, does the HSA3 electrical wiring need to be connected in the junction box to complete the circuit for the CH ?Note when replacing Sunvic SDM1901: This actuator is only suitable when the existing actuator is fixed to the valve by two screws. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Looking at the diagram, the grey doesn’t seem to go anywhere other than link to the cylinder stat off via the broken black line.