Glow worm ultimate 3 30c open therm

C4chris

Hi all,

Would anybody be kind enough to confirm wiring for the above boiler for opentherm?

Currently wired with dumb thermostat. Assume I should be using the “bus” as opposed to the RT and 24v terminals?

Ie
CH COM -> BUS
CH NO -> BUS

Does the B.off link need removing?

Thanks

C4chris

Images attached for reference.