
Legacy™Non-Programmable Owner’s Manual

You will love this thermostat.
1
This Legacy™non-programmable thermostat is an easy
to use model that provides the most sought-after
features for keeping your home comfortable. And with
a slim profile, it is designed to be as smart – and smart-
looking – as any of the other electronics in your home.
Let this manual show you how easy it is to enjoy the
newest experience in home comfort.

Table of Contents
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Button Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
On-screen Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating the Thermostat
Setting the temperatures for heating and cooling . . . . . . . . . . . . . . 8
Using the fan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Using emergency heat (heat pump systems only) . . . . . . . . . . . . . 1
0
Installing or replacing the batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Using the thermostat to turn the heating and cooling system off . . . 1
4
Auto changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
4
Advanced Options
Advanced options display codes chart . . . . . . . . . . . . . . . . . . . . . . . 15
Changing from Fahrenheit to Celsius . . . . . . . . . . . . . . . . . . . . . . . . . 16
Turning on the continuous backlighting . . . . . . . . . . . . . . . . . . . . . . . 17
Keypad lockout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Unlocking the keypad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table of Contents
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What If . . .
The battery icon is displayed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20
“Aux heat on” is displayed (heat pump systems only) . . . . . . . . . .
20
“Em heat” is displayed (heat pump systems only) . . . . . . . . . . . . . .
20
There is a power outage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
You get a system error message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
1
Common Terms and Where to Find Them
Auto changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
Auxiliary heat (heat pump systems only) . . . . . . . . . . . . . . . . . . . . . . .
22
Backlighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
Emergency heat (heat pump systems only) . . . . . . . . . . . . . . . . . . . .
22
Hold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
22
Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24

5
Button Identification
FAN Selects whether the fan operates continuously (on) or only when needed for
heating or cooling (auto)
MODE Selects whether thermostat is set for heating, cooling, emergency heat (heat
pump system only), auto (heat and cool as needed), or off
UP Increases the temperature or adjusts the screen selection up when setting
advanced programming features
DOWN Decreases the temperature or adjusts the screen selection down when
setting advanced programming features
a
b
c
d

7
On-Screen Indicators
1. Fan mode – on or auto
2. System is in auxiliary (supplemental) mode
3. Current temperature
4. Thermostat mode is either off or using emergency heat
5. Fahrenheit
6. Keypad is locked (no padlock means unlocked)
7. Celsius
8. Battery strength indicator
9. Selected cooling set point; “on” indicates system is in cooling mode
10. Second stage of cooling is active

8
Operating the Thermostat
Setting the temperatures for heating and cooling
Your thermostat is installed with the heating set at 68° F and the
cooling set at 72° F. You can use these or change them so your home
is as warm or as cool as you would like it to be. These steps will hold
the temperature where you set it.
1. To change the heating temperature, press the
mode
button on the left until the screen says heat.
2. Press the
up or down button located on the right side
of the display until you reach the desired temperature.
3. To change the cooling temperature, press the
mode
button on the left until the screen says cool.
4. Press the
up or down button located on the right side
of the display until you reach the desired temperature.