Having just spent an hour rewiring my S plan+ system so that the Evohome + OT bridge had almost complete control of it, I started thinking of my next project.
Today I put the Evohome into Away mode and for the longest time the OT bridge gave the boiler a target temperature of 10C, which means OFF. However suddenly for no reason it put the target temperature up to 33C, but because the flow temperature was already 41C in the boiler, the boiler didn't fire up.
My current setup is
1. Boiler is now completely controlled via the OT bridge -> VR33 -> Vaillant boiler. I can see varying target flow temperatures being set. And the OT bridge is firing up the boiler too after all the wiring modifications I had to make inside the boiler PCB (i.e. jumper between 3-4, jumper between 7-8)
2. Heating pump is controlled by the boiler and now I've rewired my system, so that the CH motorised valve opens whenever the pump is running. So effectively I don't have a CH valve any more.
3. All the radiators besides two towel rails have the radiator controls on them.
4. I do have the HW kit as well with a HW valve.
5. One CH zone is UFH with a T87RF sensor and a BDR91 set up as a Zone Valve operating the UFH pump and it's own zone valve.
I now want to see what the boiler is actually up to. My boiler is up in the loft so visually monitoring it proves difficult. In fact the entire set-up is so silent, I've had to repurpose the old wired room stat to come on when the pump was running, so I knew the heating system was on - doing something!
Is there anyone who is successfully monitoring a Vaillant boiler? I have quickly built a read only eBus interface. I want to be able to monitor the flow, return, target flow temperatures and flame status. I know I can monitor flow and return via external sensors but would like the boiler's own view.
Today I put the Evohome into Away mode and for the longest time the OT bridge gave the boiler a target temperature of 10C, which means OFF. However suddenly for no reason it put the target temperature up to 33C, but because the flow temperature was already 41C in the boiler, the boiler didn't fire up.
My current setup is
1. Boiler is now completely controlled via the OT bridge -> VR33 -> Vaillant boiler. I can see varying target flow temperatures being set. And the OT bridge is firing up the boiler too after all the wiring modifications I had to make inside the boiler PCB (i.e. jumper between 3-4, jumper between 7-8)
2. Heating pump is controlled by the boiler and now I've rewired my system, so that the CH motorised valve opens whenever the pump is running. So effectively I don't have a CH valve any more.
3. All the radiators besides two towel rails have the radiator controls on them.
4. I do have the HW kit as well with a HW valve.
5. One CH zone is UFH with a T87RF sensor and a BDR91 set up as a Zone Valve operating the UFH pump and it's own zone valve.
I now want to see what the boiler is actually up to. My boiler is up in the loft so visually monitoring it proves difficult. In fact the entire set-up is so silent, I've had to repurpose the old wired room stat to come on when the pump was running, so I knew the heating system was on - doing something!
Is there anyone who is successfully monitoring a Vaillant boiler? I have quickly built a read only eBus interface. I want to be able to monitor the flow, return, target flow temperatures and flame status. I know I can monitor flow and return via external sensors but would like the boiler's own view.
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