I suspect my Danfosss HSA3 Actuator, but before replacing it, I'd like to run through the symptoms to see if it might be a problem elsewhere (I had a new boiler installed last year, so I want to rule that out first).
The problem is the house is getting too hot.
Today, the room stat was off (satisfied) but boiler still running and radiators getting hot.
Cylinder stat was on (calling for heat) but 3-way valve was at position A for radiators (i.e. lever was free to move all the way to the bottom of travel).
At this point I checked the voltages at the HSA3 terminals as follows:
Blue Neutral
Orange 248v
Grey 133v
Brown/White 243v
I then turned the cylinder stat down so that it no longer called for heat. The valve moved back to position B under spring power and the voltages were then:
Blue Neutral
Orange 7v
Grey 240v
Brown/White 0v
Then I turned the cylinder stat back up again until it came on and measured again:
Blue Neutral
Orange 240v
Grey 124v
Brown/White 0v
The valve remained in position B (lever at the top).
It seems to me that the actuator is sticking in position A when it shouldn't, but these voltages looked odd, especially the 133v and 124v.
Are these voltages what you would expect? Is the valve sticking in position A, or is this what should happen with these voltages?
Does it sound like a fault with the actuator, or is the new boiler feeding some odd voltage instructions to it. (Actuator and valve are about two years old).
Any advice welcome.
Thanks
Geoff
The problem is the house is getting too hot.
Today, the room stat was off (satisfied) but boiler still running and radiators getting hot.
Cylinder stat was on (calling for heat) but 3-way valve was at position A for radiators (i.e. lever was free to move all the way to the bottom of travel).
At this point I checked the voltages at the HSA3 terminals as follows:
Blue Neutral
Orange 248v
Grey 133v
Brown/White 243v
I then turned the cylinder stat down so that it no longer called for heat. The valve moved back to position B under spring power and the voltages were then:
Blue Neutral
Orange 7v
Grey 240v
Brown/White 0v
Then I turned the cylinder stat back up again until it came on and measured again:
Blue Neutral
Orange 240v
Grey 124v
Brown/White 0v
The valve remained in position B (lever at the top).
It seems to me that the actuator is sticking in position A when it shouldn't, but these voltages looked odd, especially the 133v and 124v.
Are these voltages what you would expect? Is the valve sticking in position A, or is this what should happen with these voltages?
Does it sound like a fault with the actuator, or is the new boiler feeding some odd voltage instructions to it. (Actuator and valve are about two years old).
Any advice welcome.
Thanks
Geoff