Carrier TP-WEM01 Installation Manual page 14

STEP 7. GUIDED SETUP
EQUIPMENT CONFIGURATION
a) The C6r thermostat needs to know how many transformers
are connected to the thermostat.
o If you connected the Rh and Rc and C wires, select two
o Otherwise, select one
b) The C6r thermostat automatically detects the wires you've
connected and will ask a few questions to configure your
system based on these connections.
c) If you have a connected accessory such as a whole home
humidifier, dehumidifier or ventilation device, you'll also
configure it here.