The UH4 offers control of a radiator zone on output 4
The UH8 offers control of a radiator zone on output 8
When used to control a radiator zone, the thermostat wired in to the radiator zone calls for heat, the output from zone 4/8 will open the radiator valve and the end switch on the valve will enable the boiler.
Looking to enable the boiler when Wiring Centre boiler LR or OR RAD valve end switch is enabled?
So that the Wiring Centre or the valve can enable the boiler, wire the orange and grey auxiliary switch of the valve in parallel with the boiler enable. Grey to LS and Orange to LR