So I've just spent quite a bit of time and effort replacing my cheap crappy valve bodies with Honeywell Valencia's.
One reason I did this is because my old valves did not match the HR92's well (seemingly) and would not fully open or fully close without using Stroke 1 mode.
I was expecting the Valencia to be a better match with the HR92, but so far I'm pretty disappointed!
My living room is currently set to 21 degrees, but the room temperature is only 20 degrees. The controller reports a heat demand of 42% from the zone, the boiler is up to temperature and the valve position on the HR92 reports 74% which should be more than enough as with my old valves they would start flowing at a valve position of about 30%. (Not coincidentally a valve position of >30% starts to generate heat demand on the controller)
Despite all this the radiator is cold and no water is flowing! It seems that no water actually flows through the valve until the valve position is past 74%. So my boiler is sitting there cycling producing its flow temperature with not a single radiator in the house flowing at all. (As this is the only zone on at the moment) DOH!
Surely this is not normal ? Any advice from the experts ?
Yes, I've had the gear adaptor off and refitted it, multiple times, yes I've made sure to fully unwind the black wheel before fitting the HR92 and it goes through it's calibration process, yet every time, the threshold at which it starts to allow water to flow is >75% which is not normal in my experience. With my old valves they started to flow at about 30% pin position, which corresponds with the point where the HR92 starts to call for heat.
I also notice that as I screw the adaptor on with the black wheel fully wound out that I can clearly hear that the pin is being pressed down somewhat as I can hear the flow rate changing. So even with the black wheel wound out fully it is already not allowing the valve to flow fully.
It's as if the pin is too long! Surely I don't need to file the pin down ???!
Hopefully someone has an idea because at the moment I feel like I've wasted a lot of money and time and have ended up changing a system that was working acceptably to one that is not working properly at all now as it is calling for heat from the boiler when the radiator is not flowing.
Edit: If I unscrew the white base from the valve body by about 1 1/4 turns (until it doesn't quite push the pin down with the black wheel wound out) it seems to work as I would expect. However leaving the base loose like this is not acceptable of course.
Edit 2: If I enable Stroke 1 mode it partly works around the issue too with the point where the valve starts flowing being much closer to the point where it starts to call for heat. But part of the reason for changing valve bodies was that I was having to use stroke 1 mode to work around problems with the old valves, also the issue of the adaptor restricting full flow remains, and I know from past experience that this radiator needs full flow from the valve to achieve room set points in winter.
I can't understand how Honeywell could have screwed up the compatibility of the HR92 and Valencia ? One of them has a pin that is too long.
Now I understand the reports I've seen on this forum of people with the boiler firing when no radiator is getting hot...
One reason I did this is because my old valves did not match the HR92's well (seemingly) and would not fully open or fully close without using Stroke 1 mode.
I was expecting the Valencia to be a better match with the HR92, but so far I'm pretty disappointed!
My living room is currently set to 21 degrees, but the room temperature is only 20 degrees. The controller reports a heat demand of 42% from the zone, the boiler is up to temperature and the valve position on the HR92 reports 74% which should be more than enough as with my old valves they would start flowing at a valve position of about 30%. (Not coincidentally a valve position of >30% starts to generate heat demand on the controller)
Despite all this the radiator is cold and no water is flowing! It seems that no water actually flows through the valve until the valve position is past 74%. So my boiler is sitting there cycling producing its flow temperature with not a single radiator in the house flowing at all. (As this is the only zone on at the moment) DOH!
Surely this is not normal ? Any advice from the experts ?
Yes, I've had the gear adaptor off and refitted it, multiple times, yes I've made sure to fully unwind the black wheel before fitting the HR92 and it goes through it's calibration process, yet every time, the threshold at which it starts to allow water to flow is >75% which is not normal in my experience. With my old valves they started to flow at about 30% pin position, which corresponds with the point where the HR92 starts to call for heat.
I also notice that as I screw the adaptor on with the black wheel fully wound out that I can clearly hear that the pin is being pressed down somewhat as I can hear the flow rate changing. So even with the black wheel wound out fully it is already not allowing the valve to flow fully.
It's as if the pin is too long! Surely I don't need to file the pin down ???!
Hopefully someone has an idea because at the moment I feel like I've wasted a lot of money and time and have ended up changing a system that was working acceptably to one that is not working properly at all now as it is calling for heat from the boiler when the radiator is not flowing.
Edit: If I unscrew the white base from the valve body by about 1 1/4 turns (until it doesn't quite push the pin down with the black wheel wound out) it seems to work as I would expect. However leaving the base loose like this is not acceptable of course.
Edit 2: If I enable Stroke 1 mode it partly works around the issue too with the point where the valve starts flowing being much closer to the point where it starts to call for heat. But part of the reason for changing valve bodies was that I was having to use stroke 1 mode to work around problems with the old valves, also the issue of the adaptor restricting full flow remains, and I know from past experience that this radiator needs full flow from the valve to achieve room set points in winter.
I can't understand how Honeywell could have screwed up the compatibility of the HR92 and Valencia ? One of them has a pin that is too long.
Now I understand the reports I've seen on this forum of people with the boiler firing when no radiator is getting hot...
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