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Hello and Happy New Year!
I have been trying to work out how to connect my Ecobee to my combination central heating and domestic hot water boiler, which is an oil-fired 18kW Oertli KUSN140 with an integrated RDD-110B central heating/DHW controller from around 2002 connected to high temperature radiators.
The RDD-110B only has inputs for 3-wire analogue thermistor room stats and the boiler needs to be operational all the time for domestic hot water, so I cannot control the boiler itself from the Ecobee. Am I right in thinking that the only possible approach is to connect an external 24VAC relay to the equipment interface heat and return outputs, and to use the relay to switch mains 230VAC to the heating circulation pump, or will that cause potential problems with pump overrun requirements for the boiler?
Any help or previous experience greatly appreciated!