Netatmo Thermostat Modulant Intelligent Installation page 10

2/3 Identify the wires
If you are replacing a wireless thermostat,
remove your former thermostat's relay.
If you are installing your first thermostat,
you may have to remove the shunt
between the two room thermostat
terminals.
Connect the black and grey wires of the
boiler adaptor cable to the OpenTherm
room thermostat terminals (no polarity).
10
-/+
or
T1/T2
or
OT
OpenTherm
Thermostat terminals
black and grey wires
No polarity