ABB -free@home TH-1.1 Product Manual page 7

G. A new symbol will appear in the floor plan.
2.1 More than one Thermostat ("Master & Slave")
Of course you can have more than one Thermostat. There are two options:
OPTION 1: There are 2 (or more) Thermostats for the same HVAC equipment
If you only have one HVAC equipment but want to have 2 (or more) Thermostats for controlling
it, make one Thermostat the "Master" and the other one(s) a "Slave". This is done during
configuration (see next chapter).
Important: The control wires must be connected to the "Master" Thermostat. The Slaves only
need 24 V AC connected to the Rc and C terminals. Master and Slave will show the same
information on their display.
See the example above: The Thermostat in the Hall is the "Master". The Thermostat in the
Master Bedroom is the "Slave".
OPTION 2: There are 2 (or more) HVAC equipment in the house
If you have 2 (or more) HVAC equipment (e.g. one for the 1
floor) configure both Thermostats as "Thermostat".
Product Manual 2CQA 100 014 B0001 │ 2018-09-28
Adding the Thermostat
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