Danfoss HSA3 3-Port Valve Actuator

Product Information

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. When HW gets satisfied the cylinder stat breaks contact to boiler and switches power to the satisfied terminal of the stat. While doing this a second micro switch allows power out of the valves orange wire to re start the boiler.

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. 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. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. 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. By purchasing the actuator, you may just swap out the head of the device rather than having to replace the entire thing.

Danfoss controls are central heating system time and temperature controls manufactured by well know controls company Danfoss. I have removed the existing HSA3 actuator during DIY, but foolishly I’ve lost the 2 fastening screws, so I can’t refit it. For the last few weeks I have had the 3way valve actuator wiring disconnected and have just been using the system for hot water.

You can hear the microswitches ticking constantly when the system is fired up for HW only as the motor gets to mid position, it won't go any further ? To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. 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. 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.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 was expecting the orange to become live once the valve had moved to the heating position but that’s not the case. Look out for features such as 24 hour or 7 day programmable models, 2 or 3 wire installation, frost protection and number of on/off periods per day.