39 69-2715EF—07
Glossary
C wire
The “C” or common wire brings 24 VAC power to the thermostat from the heating/cooling system.
Some mechanical or battery operated thermostats may not have this wire connection. It is necessary
for establishing a WiFi connection to your home network.
Heat Pump heating/cooling system
Heat pumps are used to heat and cool a home. If your old thermostat has a setting for emergency heat,
you likely have a heat pump.
Conventional heating/cooling system
Non–heat pump type systems; these include air handlers, furnaces or boilers that run on natural gas,
oil or electricity. They may or may not include an air conditioner.
Jumper Loop
In this thermostat, a plug with a wire loop located below the terminal block is used to connect the R
and Rc terminals.
MAC ID, MAC CRC
Alphanumeric codes that uniquely identify your thermostat and used for registering the thermostat to
your account at mytotalconnectcomfort.com
QR Code
®
Quick response code. A two-dimensional,machine-readable image. Your wireless device can read the
black and white pattern in the square and link its browser directly to a web site. QR Code is a registered
trademark of DENSO WAVE INCORPORATED.
Electrical Ratings
Terminal Voltage (50/60Hz) Max. Current Rating
W-O/B 20-30 Vac 1.0 A
W2 (Aux/E) 20-30 Vac 1.0 A
Y Cooling 20-30 Vac 1.0 A
Y2 Cooling 20-30 Vac 1.0 A
G Fan 20-30 Vac 0.5 A
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