LightwaveRF Comfy LW920 Professional Series Instruction Manual page 21

Install 2: Y plan
Wire the Boiler Switch
Use a 5 core cable to connect the Boiler Switch to the wiring centre (you can
also use a 2 core and a 3 core cable together instead). Connect the room
thermostat terminals, and add live, neutral and earth as shown in the diagram.
Remember that the terminal arrangement in your wiring centre may not be
identical; this is an approximate guide only.
Room thermostat terminals
'Normally open',
'common' and
'normally closed'
relay contacts
(closed position
shown)
NOTE: 5 core cable
shown. 3 core
(power) and 2 core
(room thermostat
connection) cables
can be used instead