Motorised zone valve (Honeywell V4043)

Hi all,

I’ve switched my oil boiler for heating to a Tasmota/MQTT device, and now want to further control when it turns on and off.

I’ve found three V4043 zone valves but it appears they do more than just open/closed - they also trigger the boiler itself to turn on.

I have access to the original junction box but given these are 5 wire devices it’s going to take me a while to trace back the circuit.

I was wondering if anyone else has come across this type of zone valve that also controls a boiler?