White Rodgers Thermostat 1F78 - Manual (Page 4)

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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 body and the base. To remove the body, gently pull it
straight out from the base. To replace the body, line up the body with
the base and press gently until the body 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 posi-
tion. 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
is displayed when the 2 “AAA” batteries are low
and should be replaced. Nothing else will be displayed. Earlier
models display
“LO BATTERY”. Refer to 37-7006.
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 STORAGE
— 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 Fahr-
enheit. 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
. When the batteries are low, pressing any but-
ton will cause the display to operate for ten seconds. After ten
seconds, the display will be blank except for
. After
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 ther-
mostat 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 accomplished (within
a ±3° range) as follows:
1. Press and 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— The display backlight improves dis-
play contrast in low lighting 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.
Figure 8. Thermostat display, buttons and switches
5
CHECK THERMOSTAT OPERATION
CONTINUED FROM THIRD PAGE