I'm a long time lurker and have read a lot of useful information on here; so first of all, thanks for all of those posts. Unfortunately, I find myself facing a steep learning curve after my previous plumber walked off the job just after removing my existing boiler and DHW cylinder. Just for background, I have previously setup Evohome systems to control both CH (rads only all with HR92UKs) & DHW using the Evohome kit with the thermostat in a pocket. The boiler control was just via a BDR91 with additional BDR91s to open individual 2 port valves for CH or DHW. So standard S-Plan with TPI control.
The new system that will be installed by a new plumber is planned to use X-Plan with OpenTherm bridge. 1st floor is all rads whilst ground floor is wet UFH in three zones. I have an HCC80R (and there will be a further zone added next year for an extension). I am fairly confident this setup will work but neither the new plumber nor I are clear on some things:
1. Is the OpenTherm bridge the only required control to the boiler?
2. What combination of thermostats is needed in the DHW cylinder? (The cylinder is a high gain from Joule with a coil rated at 30kW, I think.)
3. Does there need to be an additional* 2 port valve on the flow to the UFH manifold? If so, how should this be controlled? (For example, by opening the port when running the pump for the UFH?)
4. The Intergas manual for X-Plan does not include an automatic bypass valve; given that all BDR91s and UFH actuators might be closed, should there be a bypass for overrun flow? If so, any suggestions on best place to put it?
5. Is there a particular software version I should be running on the Evohome controller?
* Additional to the normally closed DHW valve and normally open CH valve.
Genuinely appreciative of receiving as much detail as possible about working setups. I essentially have a green field site with all the bits waiting to be put together. So I want to avoid mis-steps. And also want to have a working heating system again soon.
Sorry for long post.
The new system that will be installed by a new plumber is planned to use X-Plan with OpenTherm bridge. 1st floor is all rads whilst ground floor is wet UFH in three zones. I have an HCC80R (and there will be a further zone added next year for an extension). I am fairly confident this setup will work but neither the new plumber nor I are clear on some things:
1. Is the OpenTherm bridge the only required control to the boiler?
2. What combination of thermostats is needed in the DHW cylinder? (The cylinder is a high gain from Joule with a coil rated at 30kW, I think.)
3. Does there need to be an additional* 2 port valve on the flow to the UFH manifold? If so, how should this be controlled? (For example, by opening the port when running the pump for the UFH?)
4. The Intergas manual for X-Plan does not include an automatic bypass valve; given that all BDR91s and UFH actuators might be closed, should there be a bypass for overrun flow? If so, any suggestions on best place to put it?
5. Is there a particular software version I should be running on the Evohome controller?
* Additional to the normally closed DHW valve and normally open CH valve.
Genuinely appreciative of receiving as much detail as possible about working setups. I essentially have a green field site with all the bits waiting to be put together. So I want to avoid mis-steps. And also want to have a working heating system again soon.
Sorry for long post.
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