Discuss Help wiring bdr91 to baxi 600 combi boiler in the Central Heating Systems area at ElectriciansForums.net
B1 and bk2 it doesn’t matter which way round. Conventionaly you would connect bk2 to A and b1 to B.
No bk2 provides the 230V output and the A and B are just a normally open contact that closes when the thermostat tells it to and sends the live to b1.
Obviously you also have to power the receiver with a line and neutral.
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