LightwaveRF Comfy LW920 Professional Series Instruction Manual page 28

Install 4: S plan plus (multizone)
Typical wiring for a multi-zone (S plan plus) setup
Neutral connection
Room thermostat 1 (with neutral wire connection) to be replaced by
Boiler Switch which requires additional live and earth connections.
Zone
valve 1
Connecting wires
Zone
valve 2
Room
thermostat 2
Connecting
wires