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Junkers/Bosch Boiler Heattronic I powercontrol

The project is a power control that allows manual control between ~30% and 100% with an on/off thermostat. on a Heattronic I Boiler.

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Junkers/Bosch Eurostar 24 boiler Power control.

When the Junkers/Bosch thermostat is replaced, the only choice is an on/off thermostat. Which means 100% power or no power.

This is due of the Heatronic I regulator (analogue, no EMS bus! )
(Normaly uses an TR21 / TR100 of TR200 Thermostat )

The project is a power control that allows manual control between ~30% and 100% with an on/off thermostat.

This already works at my home with a honeywell evohome BRD91 switch or with a potential-free switching contact.

HL_Schematic.PNG

Portable Network Graphics (PNG) - 26.26 kB - 01/04/2024 at 21:04

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TR200.jpg

JUNKERS TR 200 Ceracontrol Room Temperature Controller

JPEG Image - 177.29 kB - 01/04/2024 at 15:47

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