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5
OPERATION
Figure 6. Thermostat display, buttons, and switches
CL 1+2
OFF
HT 1+2
5
5
7
6 8
2
1
3 4
LOCK
COOL-OFF-HEAT-AUTO
AUTO
FAN ONSYSTEM
9
BATTERY
Before you begin using your thermostat, you should be familiar
with its features and with the display and the location and
operation of the thermostat buttons. Your thermostat consists of
two parts: the thermostat cover and the base. To remove the
cover, gently pull it straight out from the base. To replace the
cover, line up the cover with the base and press gently until the
cover snaps onto the base.
THE THERMOSTAT BASE
Other than and , the following buttons and switches are
located behind the door on the bottom of the thermostat cover
(see fig. 6). Pull the door down to open it.
The Thermostat Buttons and Switches
1
(Red arrow) Raises temperature setting.
2
(Blue arrow) Lowers temperature setting.
3
SYSTEM button (COOL, OFF, HEAT, AUTO).
4
FAN switch (ON, AUTO).
The Display
5
HT is displayed when the SYSTEM button has been pressed
to put the thermostat in the HEAT mode. CL is displayed
when the SYSTEM button has been pressed to put the
thermostat in the COOL mode. CL is displayed (flashing)
when the compressor is in lockout mode. AUTO is displayed
when the SYSTEM button has been pressed to put the
thermostat in the automatic changeover (AUTO) mode. 1+2
indicates the number of stages the thermostat is calling for.
6
Displays current temperature.
7
LOCK is displayed when keypad lockout has been acti-
vated.
8
Displays current setpoint temperature (this is blank when
SYSTEM button has been pressed to turn the system OFF).
9
LO BATTERY is displayed when approximately 70% of
battery life has been exhausted.
OPERATING FEATURES
Now that you are familiar with the thermostat buttons and
display, read the following information to learn about the many
features of the thermostat.
• TEMPERATURE SETPOINT — Press or until the
display shows the temperature you want.
• SIMULTANEOUS HEATING/COOLING SETPOINT
STORAGE — You can enter both your heating and cooling
setpoints at the same time.
• AUTOMATIC CHANGEOVER —If you have a heating/
cooling system, you can set the thermostat to automatically
switch from heat to cool as needed to maintain setpoint
temperature. To select this mode, press SYSTEM button
until AUTO is displayed along with HEAT or COOL.
In AUTO mode, pressing and at the same time will
change the displayed setpoint temperature to the setpoint
of the other mode (HEAT or COOL). This allows you to
change both the HEAT and COOL setpoints, if desired.
• TOTAL KEYPAD LOCKOUT — This security feature al-
lows you to lock out the thermostat buttons to prevent
unauthorized tampering. To select this feature, press
and SYSTEM button at the same time and hold until LOCK
is displayed. To unlock the thermostat, press and
SYSTEM buttons at the same time until LOCK is no longer
displayed.
• °F/°C CONVERTIBILITY — Press and SYSTEM but-
tons until the temperature display is in Celsius. To display
Fahrenheit, repeat the process.
• TEMPERATURE DISPLAY ADJUSTMENT — Your new
thermostat has been accurately set in our factory. However,
if you wish, you may adjust your new thermostat tempera-
ture display. This can be accomplished (within a ±4°F
range) as follows:
1. Press and hold and SYSTEM buttons at the same
time until the actual temperature only is displayed (about
5 seconds).
2. Press or to adjust the displayed temperature to
your desired setting. (To reset the temperature display
back to the actual sensed temperature, press and
SYSTEM buttons at the same time again.)
3. Press SYSTEM to resume normal thermostat operation.
TROUBLESHOOTING
If your thermostat’s display is frozen or displaying incorrectly,
the thermostat may have been affected by static discharge or
voltage variations. If this happens, press the RESET button (see
fig. 2, page 2 for the location of the button). If pressing the
RESET button does not correct the problem, contact a qualified
service technician.
For optimum performance, we recommend replacing batteries
once a year with fresh “AA” Energizer
®
alkaline batteries.