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5
OPERATION
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
FAN switch (ON, AUTO).
4
SYSTEM switch (COOL, OFF, HEAT).
The Display
5
HT is displayed when the SYSTEM switch is in the HEAT
position. When calling for the first stage of heat, HT1 will
display. When calling for the second stage of heat, HT1+2
will display. CL is displayed (non-flashing) when the SYS-
TEM switch is in the COOL position. When calling for the
first stage of cool, CL1 will display. When calling for the
second stage of cool, CL1+2 will display. CL is displayed
(flashing) when the compressor is in lockout mode.
6
Displays current temperature.
7
LOW BATTERY is displayed when the 3 "AA" batteries are
low and should be replaced. Nothing else will be displayed.
8
Displays current setpoint temperature. This is blank when
SYSTEM switch is in the OFF position.
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 STORAGE — You
can enter both your heating and cooling setpoints at the
same time. There is no need to reset the thermostat at the
beginning of each season.
• LOW BATTERY INDICATOR — If the 3 “AA” alkaline
batteries are low and should be replaced, the display will be
blank except for the word LOW BATTERY. When the
batteries are low, pressing any button will cause the display
to operate for ten seconds. After ten seconds, the display
will be blank except for the word LOW BATTERY. When the
duration of a low battery condition exceeds four weeks, the
setpoint is altered by 10 degrees to signal that the batteries
must be replaced.
Figure 6. Thermostat display, buttons, and switches
2
1
3 4
COOL 1+2
OFF
HEAT 1+2
5
5
8
7
6
COOL-OFF-HEAT
AUTO
FAN ON SYSTEM
LOW BATTERY
• °F/°C CONVERTIBILITY— When the thermostat is in the
temperature display adjustment mode, or 30 seconds after
power up, pressing and at the same time will switch
the LCD temperature display between Fahrenheit and
Celsius.
• 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 to match your old thermostat. This can be
accomplished (within a ±4°F range) as follows:
1. Move the SYSTEM switch to OFF position.
2. Press and hold and move the SYSTEM switch to
HEAT or COOL. Release .
3. Press
or to adjust the displayed temperature to
your desired setting. After setting your desired tempera-
ture, do not press any buttons for ten seconds. The
thermostat will continue operating at the changed tem-
perature setting.
4. Pressing the hardware RESET button (see Fig. 2) will
return the offset to zero.
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.