SYSTEM:
Worcester Bosch 8000 Life regular boiler on S Plan system.
Honeywell Normally Closed 2 port valves.
Honeywell programmable controller.
Nest E running as on/off and providing a heating schedule. I would switch to heating HW manually at the controller when needed.
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After a bit of trial and error and a lot of learning, I think I'm nearly there with swapping the on/off 2 wire room stat for the Worcester Easy Control CT200.
The CT200 is connected to the EMS bus and seems to work. The final hurdle is, the 2 port valve for CH is not opening. Opening the valve for HW still works from the programmable controller.
Am I correct in thinking it because I've broken the 230v continuity to the valve by removing the old stat? Should I be installing a jumper at the wiring center between where the 230v supply that went to the old stat and the connector where the switched return came back?
I've attached a picture of the wiring BEFORE removing the send and return for the stat.
There is a programmer with CH and HW. Previously the CH on/off made no difference as the Nest E appeared to over ride this. To heat HW I would just manually switch the HW side to constant until the cylinder stat stopped calling for heat, then go turn it to off. I presume I'll be leaving both on constant to allow the CT200 to take control?
So close, but no there yet. Given that this is a consumer retail thermostat, it seems off that WB do not publish any instructions or guidance on how to install it!
This is what I've done so far, for anyone considering the same:
Old stat removed and 230v feed disconnected at the wiring center. Mine is a 4 core cable, so I've used the 2 spares for CT200 to EMS bus (via the wiring center, then on to the boiler)
Switched live return from the wiring center, to the boilers CH input, disconnected at the boiler end (insulated and left in place in case I decide to revert to the old stat).
I've installed the 2 jumper wires between the boiler internal connections from 230v out to the live returns for HW and CH.
Thanks for any help.
Worcester Bosch 8000 Life regular boiler on S Plan system.
Honeywell Normally Closed 2 port valves.
Honeywell programmable controller.
Nest E running as on/off and providing a heating schedule. I would switch to heating HW manually at the controller when needed.
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
After a bit of trial and error and a lot of learning, I think I'm nearly there with swapping the on/off 2 wire room stat for the Worcester Easy Control CT200.
The CT200 is connected to the EMS bus and seems to work. The final hurdle is, the 2 port valve for CH is not opening. Opening the valve for HW still works from the programmable controller.
Am I correct in thinking it because I've broken the 230v continuity to the valve by removing the old stat? Should I be installing a jumper at the wiring center between where the 230v supply that went to the old stat and the connector where the switched return came back?
I've attached a picture of the wiring BEFORE removing the send and return for the stat.
There is a programmer with CH and HW. Previously the CH on/off made no difference as the Nest E appeared to over ride this. To heat HW I would just manually switch the HW side to constant until the cylinder stat stopped calling for heat, then go turn it to off. I presume I'll be leaving both on constant to allow the CT200 to take control?
So close, but no there yet. Given that this is a consumer retail thermostat, it seems off that WB do not publish any instructions or guidance on how to install it!
This is what I've done so far, for anyone considering the same:
Old stat removed and 230v feed disconnected at the wiring center. Mine is a 4 core cable, so I've used the 2 spares for CT200 to EMS bus (via the wiring center, then on to the boiler)
Switched live return from the wiring center, to the boilers CH input, disconnected at the boiler end (insulated and left in place in case I decide to revert to the old stat).
I've installed the 2 jumper wires between the boiler internal connections from 230v out to the live returns for HW and CH.
Thanks for any help.
