Hi all,
First off a disclaimer! I am not a heating engineer and have relatively limited knowledge in this area so apologies if I misrepresent something... I'll try to be as acurate as possible.
My aim is to take my fully working system from being driven by BDR91s to the RA8810 OpenTherm module to benefit from the intelligence that this brings.
Ok, so first things first... the kit
Ideal Vogue Gen 2 S26 boiler
EvoHome WiFi controller
Evohome UFH Controller (No Actuators, the EvoHome pad acts as the temp sensor)
EvoHome CS92 Hot Water kit (Strap-on sensor)
EvoHome BDR91 (CH + DHW)
EvoHome RA8810 (Fitted and ready to go but currently disconnected)
EvoHome HR92s on pretty much all radiators (except bathroom towel rails and one radiator)
1 x 2 port valve connecting the UFH into the main flow & return
1 x 3 port valve for water flow to either CH / DHW / Both
So as I indicated above, the system works fine today. It was commissioned around 9 months ago and at that time everything above (except the 3 port valve) was bought together as this was a new install. The engineer was happy enough to do the work but was completely stumped by the EvoHome system generally and even more so by the OT module... for a time it was connected and flashing green, but I gather so was the switched live for the BDR91s. After a while and a callout to fix a different problem the OT was disconnected as the guy just couldnt figure it out.
Fast forward and I have recently had a differnent engineer visit (a honeywell connected specialist) with one more to come next week with the express wish to sort this out so that I can have the OT module doing what it is meant to.
The engineer provided a quote for the remedial works which includes the following:
- Fitting an automatic bypass
- Removing the 2 port valve for the UFH and fitting Actuators
- Swapping the 3 port valve for a 2 port valve for just the hot water (presumably the CH flow is then constant ?)
- A complete rewire and re-commision of the system
I am happy to go ahead with this work if it is needed but from my reading I am really unsure! I can see the benefit of going to an S-Plan system over the current Y and I believe once you get to the 24Kw level you should really have a bypass, but his proposal doesn't seem to be that, its more of an alternative S-plan..ish but I am not sure.
From reading this forum and others I think very simplistically all that needs to happen is that the switched live going from the wiring center to the boiler gets removed and the the OT connections added... this way the BDRs would still work the valves but not trigger the boiler, leaving that to the OT module.
I am looking for any and all advice on the best way to achieve the end goal of the OT module....but also to correct any issues with the system that need to be addressed.
My gut is leaning towards changing to a proper S-plan and getting the bypass fitted but happy to listen to others views.
All advice gratefully received.
Many thanks
Rob
First off a disclaimer! I am not a heating engineer and have relatively limited knowledge in this area so apologies if I misrepresent something... I'll try to be as acurate as possible.
My aim is to take my fully working system from being driven by BDR91s to the RA8810 OpenTherm module to benefit from the intelligence that this brings.
Ok, so first things first... the kit
Ideal Vogue Gen 2 S26 boiler
EvoHome WiFi controller
Evohome UFH Controller (No Actuators, the EvoHome pad acts as the temp sensor)
EvoHome CS92 Hot Water kit (Strap-on sensor)
EvoHome BDR91 (CH + DHW)
EvoHome RA8810 (Fitted and ready to go but currently disconnected)
EvoHome HR92s on pretty much all radiators (except bathroom towel rails and one radiator)
1 x 2 port valve connecting the UFH into the main flow & return
1 x 3 port valve for water flow to either CH / DHW / Both
So as I indicated above, the system works fine today. It was commissioned around 9 months ago and at that time everything above (except the 3 port valve) was bought together as this was a new install. The engineer was happy enough to do the work but was completely stumped by the EvoHome system generally and even more so by the OT module... for a time it was connected and flashing green, but I gather so was the switched live for the BDR91s. After a while and a callout to fix a different problem the OT was disconnected as the guy just couldnt figure it out.
Fast forward and I have recently had a differnent engineer visit (a honeywell connected specialist) with one more to come next week with the express wish to sort this out so that I can have the OT module doing what it is meant to.
The engineer provided a quote for the remedial works which includes the following:
- Fitting an automatic bypass
- Removing the 2 port valve for the UFH and fitting Actuators
- Swapping the 3 port valve for a 2 port valve for just the hot water (presumably the CH flow is then constant ?)
- A complete rewire and re-commision of the system
I am happy to go ahead with this work if it is needed but from my reading I am really unsure! I can see the benefit of going to an S-Plan system over the current Y and I believe once you get to the 24Kw level you should really have a bypass, but his proposal doesn't seem to be that, its more of an alternative S-plan..ish but I am not sure.
From reading this forum and others I think very simplistically all that needs to happen is that the switched live going from the wiring center to the boiler gets removed and the the OT connections added... this way the BDRs would still work the valves but not trigger the boiler, leaving that to the OT module.
I am looking for any and all advice on the best way to achieve the end goal of the OT module....but also to correct any issues with the system that need to be addressed.
My gut is leaning towards changing to a proper S-plan and getting the bypass fitted but happy to listen to others views.
All advice gratefully received.
Many thanks
Rob
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