White Rodgers Thermostat 1F78 - Manual (Page 4)

CHECK THERMOSTAT OPERATION
CONTINUED FROM THIRD PAGE
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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 Buttons and Switches
1 (Up arrow) Raises temperature setting.
2 (Down arrow) Lowers temperature setting.
3 FAN switch (ON, AUTO).
4 SYSTEM switch (COOL, OFF, HEAT).
The Display
5 is displayed when the SYSTEM switch is in the HEAT
position. is displayed (non-flashing) when the SYSTEM
switch is in the COOL position. is displayed (flashing)
when the compressor is in lockout mode.
6 Displays current temperature.
7 “LO BATTERY” is displayed when the 2 “AAA” batteries are
low and should be replaced. Nothing else will be displayed.
8 Displays currently set 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.
• SIMULTANEOUS HEATING/COOLING SETPOINT STOR-
AGE — You can enter both your heating and cooling setpoints
at the same time. There is no need to re-enter the thermostat
at the beginning of each season.
• TEMPERATURE SETTING — Press or until the
display shows the temperature you want. The thermostat will
keep the room temperature at the selected temperature.
•
°
F/
°
C CONVERTIBILITY — The factory default setting is
Fahrenheit. Clipping W904 jumper on the circuit board (see
fig. 1) will alter this feature to Celsius temperature setting.
• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline
batteries are low and should be replaced, the display will be
blank except for “LO 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
“LO BATTERY”. After “LO BATTERY” has been displayed for
4 weeks, the thermostat will raise the temperature 10
°
above
your setpoint in COOL mode and drop the temperature 10
°
below your setpoint in HEAT mode. You cannot program with
low batteries, but you can override setpoint temperature.
• TEMPERATURE DISPLAY ADJUSTMENT — Your new
thermostat has been accurately set in our factory. However,
if you wish, you may adjust your new thermostat temperature
display to match your old thermostat. This can be accom-
plished (within a
±
3
°
range) as follows:
1. Press or at the same time for two seconds with
the SYSTEM switch in OFF position.
2. Press or to adjust the displayed temperature to
your desired setting.
3. Move SYSTEM switch from OFF to exit the feature.
• DISPLAY BACKLIGHT — (Not available on earlier models.)
The display backlight improves display contrast in low light-
ing conditions. Selecting backlight ON will turn the light on for
a short period of time after any button is pressed. Selecting
backlight OFF (default) will keep the light off. Turn the display
backlight feature ON as follows:
1. Press and at the same time for two seconds with
the SYSTEM switch in HEAT position. The display will
alternately show “-L” AND “FF” (off).
2. Press or to change “FF” to “ON”.
3. Move SYSTEM switch to OFF to exit the feature.
5
WHITE-RODGERS
FAN SYSTEM
OFF ON AUTO COOL HEAT
1
4
5 7
3
2
8 6
Figure 8. Thermostat display, buttons, and switches