LightwaveRF Comfy LW920 Professional Series Instruction Manual page 11

Install 1: combi boiler
Standard combi setup with LightwaveRF Boiler Switch
The Boiler Switch replaces the original thermostat and is wired into the same
room thermostat (RT) terminal. Unlike the original thermostat, however, it
should now be located near the boiler, as it also needs to take incoming
mains power from terminals located next to the room thermostat terminal.
The Boiler Switch is connected to the
room thermostat terminal in the boiler. It
The wireless LightwaveRF
also takes live mains from the boiler.
Home Thermostat replaces the
existing one and controls the
boiler via the Boiler Switch
Existing external thermostat disconnected