Originally posted by bruce_miranda
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Underfloor heating with Evohome
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Originally posted by 1animal1 View PostCan anyone confirm, when buying a manifold - if I need the blending valve? From what I can make out, it's for protection, ensuring the max heat going through is limitedLast edited by gordonb3; 1 January 2019, 08:25 PM.
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Thanks Gordon... I have looked high and low at manifolds and can only see either bare manifolds, or those with the pump and blend valve attached. Are you suggesting you have something different to what's generally available?
The only other thing I'm questioning is the pump circ, apart from an energy saving, surely the protection mechanism is a bit of a fad if it's an in use system? A pressurised system with the correct inhibitor, new or flushed shouldn't have an issue that requires such a protection mechanism? Tell me how i am wrong in my thinking
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Originally posted by 1animal1 View PostThanks Gordon... I have looked high and low at manifolds and can only see either bare manifolds, or those with the pump and blend valve attached. Are you suggesting you have something different to what's generally available?
The only other thing I'm questioning is the pump circ, apart from an energy saving, surely the protection mechanism is a bit of a fad if it's an in use system? A pressurised system with the correct inhibitor, new or flushed shouldn't have an issue that requires such a protection mechanism? Tell me how i am wrong in my thinking
I looked up the company and found a picture of a more or less similar looking manifold. The return valve in this case appears to be a passive control though and I think they may have mentioned that in my case it is thermostatic because I'm on city heating.
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Found some additional info on that little box bottom-left in the image. It has three main functions:- it will shut down the motor when the input temperature is lower than inside the UFH (so there is no cooling after the main thermostat shuts down the boiler)
- it will shut down the motor when the UFH temperature reaches a set limit
- when the motor is switched off it will still run it for a few minutes every two days to prevent it becoming stuck
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Thanks for gathering this info Gordon, very useful. Are you running this via an Evohome? From your initial description I was taking the electronics to mean a management centre such as the Honeywell ufh controller... Rather than an additional piece of hardware, which this looks like, below the motor...
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Originally posted by 1animal1 View PostThanks for gathering this info Gordon, very useful. Are you running this via an Evohome? From your initial description I was taking the electronics to mean a management centre such as the Honeywell ufh controller... Rather than an additional piece of hardware, which this looks like, below the motor...
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Bear with me on this. If the UFH is controlled by the BDR, then surely the pump will only be running ad hoc throughout the day, therefore negating the protection and constant 'on' time causing the high electric bills. My thought is that the Honeywell will cycle it at least one every couple of hours.... Unless I'm completely off the point here? I am still at the research phase so open to being shot down
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Originally posted by 1animal1 View PostBear with me on this. If the UFH is controlled by the BDR, then surely the pump will only be running ad hoc throughout the day, therefore negating the protection and constant 'on' time causing the high electric bills. My thought is that the Honeywell will cycle it at least one every couple of hours.... Unless I'm completely off the point here? I am still at the research phase so open to being shot down
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Hi Gordon, update on this.... Still designing my system and collating the equipment.
In the interim...
Your point on the protection mechanism has had me thinking and searching for a similar solution - it then hit me, with the Evohome, I can simply set the system to cycle for a few minutes when ever I like, via the electronic programming! For info, Honeywell have also confirmed that their ufh controller does this automatically every 24 hours too, although I can't see any reference to this anywhere, so remain sceptical.
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Going off the original theory of this thread. I have a slightly different set up, can someone confirm it'll work?
I will be going for a single zone at the start using a BDR91. However together with this, because I'm using OT, the zone valve will be always open, therefore cannot be wired into the BDR along with the pump. Question is, can the pump and a thermal actuator 230v be wired into the BDR to control the flow on and off
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