Honeywell T8700B User manual

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OWNER’S GUIDE
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T8700B
An Electronic Round
™
Programmable Thermostat

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Congratulations on the purchase of your new thermostat! Over 100 years of Honeywell engineering
expertise went into the making of this thermostat in an effort to provide you with a more comfortable
and convenient living environment.
•
Simple and Easy to Use. The and keys make it easy for you to change your time and
temperature settings.
• Large digital display. You can easily read the current time and temperature at a glance.
•
No need for batteries. Batteries are not required because your time and temperature settings are
held permanently in memory.

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SETTINGS
Setting Fan and
Heat System Switches
To control the Fan and Heat settings, adjust the
Fan and Heat switches located on the top of
the thermostat wallplate.
If you have a Fan Switch, set this first:
AUTO: The fan starts a few minutes after the
heating equipment comes on.
ON: The fan runs continuously for
improved air circulation and air quality.
Then set the Heat System switch:
HEAT: Use normal setting for months when
your home needs heating. Digital
display shows a flame when
heating is on.
OFF: Heating is off.

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PROGRAMMING
The thermostat is already programmed for your
convenience with time and temperature
settings. See Table 1.
Table 1. Preprogrammed
Time and Temperature Settings.
Period Start Time Heating Setpoint
WAKE 6:00 AM 70°F (21°C)
SLEEP 10:00 PM 62°F (16.5°C)
Preprogrammed Time and
Temperature settings.
To use the preprogrammed Time and Tempera-
ture setting you must first set the current time.
1. To set the
current time:
a. Press the
key once.You will see a flashing
clock.
b. Use the or keys to set the
current time.
c. Press the key until End is
displayed.
The preprogrammed Temperature settings can
now be used.
WAKE is the time period you want your house
at a comfortable temperature during the day.
SLEEP is the time period you can set an
energy-saving temperature while you sleep.
PM

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To change the preprogrammed Time
and Temperature settings follow steps
1 through 6.
1. Set the current
time.
a. Press the
key once.You will see a flashing
clock.
b. Use the or keys to set the
current time. The clock is now set.
2. Set your WAKE
time.
a. Press the
key once.You will see a
flashing WAKE time.
PM
AM
b. Use the or keys to set your
desired WAKE time. The WAKE
time is now set.
3. Set your WAKE
temperature.
a. Press the
key once.You will see a flashing
WAKE temperature.
b. Use the or keys to set your
desired WAKE temperature. The
WAKE temperature is now set.
AM
SET

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PM
4. Set your SLEEP
time.
a. Press the
key once.You will see a flashing
SLEEP time.
b. Use the or keys to set your
desired SLEEP time. The SLEEP
time is now set.
5. Set your SLEEP
temperature.
a. Press the
key once.You will see a flashing
SLEEP temperature.
b. Use the or keys to set your
desired SLEEP temperature.The
SLEEP temperature is now set.
PM
SET
6. Run program.
a. Press
key once.
You have
completed
your
program
changes.
End is
displayed for five seconds indicat-
ing the end of programming. The
thermostat then displays the
current time and room tempera-
ture.
NOTE: To exit the programming mode at any
time, press the key until End is
displayed.
PM

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TEMPORARY
AM
SET
PM
OPERATING YOUR
THERMOSTAT
Display Temperature Setting
Press or once
to display present
temperature setting.
After approximately
five seconds, the thermostat displays the
current time and temperature.
Temporary Change
a. Press
or until
desired
tempera-
ture is displayed.
SET
PM
b. TEMPORARY is displayed.
The TEMPORARY
change is
in effect
until the
next pro-
gram period.
NOTE: To cancel your TEMPORARY change,
press until End is displayed.
Hold Function
To hold the thermostat at one temperature
indefinitely, program both WAKE and SLEEP to
the same temperature.

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ENERGY SAVINGS
You can save energy with this thermostat during the heating season by automatically lowering the
temperature setting 5°F (3°C) to 10°F (5°C) at night.
PERCENT OF HEATING
COSTS YOU CAN SAVE
SAVINGS FOR ONCE-A-DAY
10°F (5°C) DECREASE*
6TO 8%
9TO11%
12 TO 13%
14 TO 15%
16 TO 18%
HEAT
YOUR SAVINGS DEPENDS ON HOME SIZE AND
ACTUAL HEAT LOSS OR GAIN, GEOGRAPHIC
LOCATION, FREQUENCY OF TEMPERATURES
CHANGE, AND RANGE IN DEGREES OF CHANGE.
M11972

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Symptom Corrective Action
Heating does not come on. Check that the heat setpoint is above room temperature.
Check that the system switch on the thermostat is set to HEAT.
Check the system fuse or circuit breaker and replace or reset if
necessary.
Check power to the heating equipment.
Temperature setting is too
warm or too cool. Adjust the temperature by pressing either the or key.
Blank display. Check that switch to furnace is on.
Check that the thermostat is properly latched on wallplate.
Displays only time and not
temperature. Power is interrupted to the thermostat.
Power is interrupted. The current time is maintained up to 20
minutes after power interruption. Reset heating setpoint.
Time flashing. Power was interrupted longer than 20 minutes. Reset clock.

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If you have any questions concerning this thermostat, please visit our website at
www.honeywell.com/yourhome, or call the 24-hour automated information line at 1-800-468-1502.
For service, contact your local heating and cooling contractor: