Programmable
Load Controller
USER’S GUIDE
Weekday/Weekend
(5-day/Saturday/
Sunday)
Programmable
Heat and/or Cool
Conventional
and Heat Pump
T7512A,B,C
Scientific
Atlanta
Honeywell
TM
1 69-0989—1
69-0989-1
Welcome to the world of comfort and energy
savings with your new Scientific Atlanta/
Honeywell SuperStat thermostat.
to take advantage of special programs you can
subscribe to that can increase your energy
savings further.
This thermostat allows full weekday/weekend
programming so that you can set the thermostat
to control the temperature in your home
according to your personal schedule and
preferences. When programmed according to
the instructions in this guide, the features
available with this thermostat will not only keep
you comfortable, but will also save you energy.
In addition to being programmable, this
thermostat also contains a communications
module. This module allows your utility
company to communicate with your thermostat
These special programs can include one or
both of the following:
Time-of-Use Pricing. If your utility offers Timeof-Use Pricing rates, this thermostat will
communicate with the utility to inform you of the
rate in effect at any given time. The rate that is
in effect is indicated on the thermostat display
as shown in Fig. 1. A special feature of this
thermostat allows you to set an offset
temperature that automatically adjusts your
energy use for each rate. This typically involves
controlling your home at a higher temperature
2 69-0989—1
during the cooling season and a lower
temperature during the heating season.
AM
TUE
HR
1 2 3 4
COOL
AUTO
word SAVING is displayed on the thermostat.
See Fig. 2. You must subscribe to these
programs before your utility company can
communicate with your thermostat. If you have
any questions concerning the application of this
thermostat or these special programs and
features, please contact your local utility.
INDICATOR FOR TIME-OF USE PRICING
M7904
Fig. 1. Time-of-Use Pricing indicator.
Direct Load Control. If your utility offers Direct
Load Control, this thermostat can be controlled
by your utility to limit your cooling and heating
use during peak demand times. When your
thermostat is under Direct Load Control, the
AM
TUE
SAVING
HR
SAVINGS INDICATOR
COOL
AUTO
M7903
Fig. 2. Saving indicator.
3 69-0989—1
Table of Contents
Recovery From Setback ................................................................................................................. 5
Programming Your Thermostat ....................................................................................................... 6
Personal Programming Charts ........................................................................................................ 8
Step 1—Set the Current Time/Day .......................................................................................... 10
Step 2—Enter the Program Schedules .................................................................................... 10
Step 3—Set the System and Fan Controls .............................................................................. 13
Step 4—Start the Thermostat Program ................................................................................... 14
Operating Your Thermostat ............................................................................................................. 15
Thermostat Operation When Special Programs are in Effect ......................................................... 19
Replacing the Thermostat Batteries ................................................................................................ 21
Troubleshooting Guide .................................................................................................................... 23
Typical Energy Savings................................................................................................................... 28
Warranty Conditions........................................................................................................................ 31
4 69-0989—1
RECOVERY FROM SETBACK
The term
thermostat uses to operate the heating or
cooling equipment to return the house from the
energy savings setting you select when you are
away or asleep to the temperature you prefer
when you are home and awake.
recovery
refers to the process the
and begin warming the house to 72°F. If you
want the temperature in the house to be 72°F at
6:00 AM, you should program the thermostat to
an earlier time; for example, 5:30. (The exact
amount of time it takes your home to warm or
cool to the temperature you want depends on
many factors such as the size of your heating/
cooling equipment and the outdoor
temperature.)
This thermostat uses a recovery process that
turns your heating/cooling equipment on or off
at the time you program the temperature to
change. For example, if you program the
thermostat’s heating program to 72°F at 6:00 AM,
the heating equipment will come on at 6:00 AM
If this thermostat is for a heat pump system, the
thermostat uses an algorithm when recovering
from setback that helps reduce the use of
auxiliary heat.
5 69-0989—1
PROGRAMMING YOUR
THERMOSTAT
IMPORTANT
Batteries must be installed to maintain
time and date in the event of power
loss.
You will find it helpful to complete the Personal
Programming Charts on the following pages
before you begin programming the thermostat.
Plan your program schedule of time and
temperature settings for various times of the
day by filling in the boxes in the Personal
Programming Charts. There are four time
periods available for weekdays, Saturday, and
Sunday—WAKE, LEAVE, RETURN, and
SLEEP. These periods can be displayed
individually on the thermostat as you press the
WEEKDAY SCHEDULE or WEEKEND
SCHEDULE keys. You may want to enter a
different schedule for both the cooling and
heating seasons.
WAKE is the time you get up. Generally you
want the house at a comfortable
temperature when you wake up and get
ready to go to work or school. Set the
WAKE time earlier than your alarm clock
so the house has time to warm up or cool
down before you get up.
6 69-0989—1
LEAVE is the time you leave for work or
school. Generally, once you leave the
house, you want the temperature higher
or lower (depending on the season) so
that you can save energy while you are
away.
RETURN is the time you return from work or
school. Once again, you want the house
at a comfortable temperature when you
return and go about the normal activities
of your day before bedtime. Set the
RETURN time earlier than the time you
actually get home so the house has time
to warm up or cool down before you get
there.
SLEEP is the time you usually go to sleep.
While you are sleeping, you can save
energy by setting the thermostat to
control the temperature higher or lower
(depending on the season). For more
comfortable sleeping, some people
choose not to raise the cooling
temperature at night.
If you decide not to program the thermostat, it
automatically controls heating and cooling
temperatures as follows. Starting at 6:00 AM
every day, the thermostat sets the heating
temperature to 68° and the cooling temperature
to 76°F. At 10:00 PM every night, the thermostat
sets the heating temperature back to 60°F; the
cooling temperature remains at 76°F.
7 69-0989—1
You do not need to enter a time and
temperature program for every period if your
schedule does not require it. For example, if
your house is occupied during the day on
weekdays, you can program only the WAKE
and SLEEP times.
NOTE: Temperatures cannot be set any
higher than 88°F or any lower than
45°F.
Personal Programming Charts
Cooling Schedule (for Summer Use):
Time Cooling Temperature
Weekday WAKE
LEAVE
RETURN
SLEEP
Saturday WAKE
LEAVE
RETURN
SLEEP
Sunday WAKE
LEAVE
RETURN
SLEEP
8 69-0989—1
Heating Schedule (for Winter Use): If you subscribe to Time-of-Use Pricing, use the
Time Heating Temperature
Weekday WAKE
LEAVE
RETURN
SLEEP
Saturday WAKE
LEAVE
RETURN
SLEEP
Sunday WAKE
LEAVE
RETURN
SLEEP
following table to plan the offsets you will enter
for each Time-of-Use Pricing rate. You should
enter different offsets for the heating and
cooling seasons. You do not need to enter an
offset for rate 1.
Offsets for
Cooling Season (+)
Rate 2 Rate 3 Rate 4 Rate 2 Rate 3 Rate 4
Offsets for
Heating Season (-)
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Before programming the thermostat, remove
the clear plastic overlay that covers the display.
When pressing the keys, use the ball of your
finger or a soft pencil eraser; using sharp
fingernails or pencil points can damage the
keypad. If you make a mistake during
programming, press the RUN PROGRAM key
and reprogram the time, temperature, or offset
with the error.
Step 1—Set the Current Time/Day
To set the time, press and release the SET
CLOCK/DAY key once. Press AHEAD or
BACK keys until the current time is displayed.
To set the day, press and release the SET
CLOCK/DAY key again. Press AHEAD or
BACK keys until the current day is displayed.
After you have set the time and day, press the
RUN PROGRAM key.
Step 2—Enter the
Program Schedules
Entering a Heating Schedule
Refer to your Personal Programming Charts
and proceed as follows:
Press the SYSTEM key until the thermostat
displays the word HEAT to indicate you
are in the heating mode. Press and
release the WEEKDAY SCHEDULE key
once. The words WAKE, MON...FRI and
SET appear on the display.
10 69-0989—1
Press the AHEAD or BACK keys to set the
weekday WAKE time from your Personal
Programming Charts. Press the
WARMER or COOLER keys to set the
weekday WAKE temperature from your
Personal Programming Charts.
Press the WEEKEND SCHEDULE key again
so that SUN, WAKE and SET appear on
the display. Set the WAKE, LEAVE,
RETURN and SLEEP schedules for
Sunday just as you did for the weekdays
and Saturday.
Repeat the above sequence for the other
weekday schedules: LEAVE, RETURN, and
SLEEP.
Press the WEEKEND SCHEDULE key until
SAT, WAKE and SET appear on the
display. Set the WAKE, LEAVE, RETURN
and SLEEP schedules for Saturday just
as you did for the weekdays.
Enter Offset Values
Enter the offset for each Time-of-Use Pricing
rate using the OFFSET key. You can enter
offset numbers only if you are a subscriber to
Time-of-Use Pricing.
The offset you enter is the number of degrees
you are willing to allow the heating or cooling
temperature you have already programmed for
11 69-0989—1
normal operation to change so you can save
money at each rate. For example, if you
normally want your home heated to 72° when
rate 1 is in effect, but are willing to let your
home cool to 70° when rate 2 is in effect, your
heating offset for rate 2 is -2 (72° -2° = 70°). If
you do not enter an offset, the offset is 0°. The
first time you press the OFFSET key, the offset
for rate 1 is displayed (note the indicator on the
thermostat display as shown in Fig. 1). Use the
WARMER and COOLER keys to set the offset
value. Repeat the procedure for each rate. After
you have entered the last offset value, press the
RUN PROGRAM key.
Entering a Cooling Schedule
Press the SYSTEM key until the thermostat
displays the word COOL to indicate you are in
the cooling mode.
Enter cooling temperatures for the WAKE
LEAVE, RETURN and SLEEP times by
following the same instructions as for Entering a
Heating Schedule above. If you subscribe to
Time-of-Use Pricing, enter offsets for the
cooling season as you did for the heating
season.
12 69-0989—1
Step 3—Set the System
and Fan Controls
After programming the thermostat, set the
system and fan controls as follows:
System Control
If you have a conventional heating/cooling
system, the system can be set to: HEAT, COOL
or OFF. If you have a heat pump system, the
system can be set to: HEAT, EM. HEAT, COOL
or OFF.
You can change the system setting by pressing
the SYSTEM key. Each time you press the key,
the system status changes to the next setting.
The status of the system is as follows when the
associated indicator is displayed:
HEAT: The thermostat will control your
heating system according to the
schedule you programmed (heat
pump in heating mode).
EM. HEAT: The emergency heater element of
the heat pump is on.
COOL: The thermostat will control your air
conditioning system according to
the schedule you programmed
(heat pump in cooling mode).
13 69-0989—1
No status Both the heating and air conditioning
displayed: systems are off (heat pump off).
Fan Control
There are two fan settings: AUTO and ON.
Set the fan at the setting you want by pressing
the FAN key. Each time you press the key, the
fan status changes to the next setting.
When FAN is displayed, the fan is on
continuously. Use this setting for improved air
circulation during special occasions or for more
efficient electronic air cleaning.
When nothing is displayed, the fan is in AUTO
mode (it comes on with the heating or cooling
equipment, as needed). AUTO is the normal
setting for most homes and allows a singlespeed fan to turn on automatically with the air
conditioner or furnace. If you have a two-speed
fan, it usually runs on high with the air
conditioner and on low with the furnace.
Step 4—Start the
Thermostat Program
To start the thermostat using the program you
have just entered, press the RUN PROGRAM
key.
NOTE: For information on energy savings,
refer to the maps in the Typical Energy
Savings section.
14 69-0989—1
OPERATING YOUR
THERMOSTAT
Normally you want your thermostat to run
according to the program you entered; however,
you can also perform the following operations.
NOTE: The system control must be set to
Temporarily Change Temperature
Setting
Press the WARMER or COOLER key until the
temperature you want is displayed. The
HEAT or COOL to perform the
following operations.
for the current period only
temporary setting stays in effect only until the
next scheduled program change. (If you
subscribe to Time-of-Use Pricing, it stays in
effect only until the next rate change takes
effect.) To cancel the temperature change,
press the RUN PROGRAM key. When a
temporary temperature is in effect, the display
alternates between the time/temperature and
the temporary setting.
Hold a Temperature Indefinitely
You could find this operation useful when you
go out of town on business or on vacation.
Press the HOLD TEMP key and then set the
temperature using the WARMER or COOLER
keys. This temperature stays in effect until you
15 69-0989—1
press the RUN PROGRAM key or the
PRESENT SETTING key.
Check the Current Temperature Setting
To check the current (programmed) temperature
setting, press the PRESENT SETTING key.
Check the Programs You Entered
Press the WEEKDAY SCHEDULE or
WEEKEND SCHEDULE key. Each time you
press the key, the next program schedule is
displayed. You can use this feature to verify that
you correctly entered the program as shown in
your Personal Programming Charts.
16 69-0989—1
Cancel a Program
You can cancel a program by pressing the
WEEKDAY or WEEKEND key until the program
you want to cancel is displayed; then press the
CLEAR key.
NOTE: You cannot cancel the WEEKDAY
WAKE program.
Check Usage
This thermostat keeps a record of the current
and accumulated on-time of your heating and
cooling equipment. It tracks
(since midnight) and
the accumulator was last cleared). If you
current day
accumulated
usage
usage (since
subscribe to Time-of-Use Pricing, the
thermostat records usage for each rate.
To view heating or cooling equipment usage,
press the SYSTEM key to display HEAT or
COOL, then press the USAGE key. Each time
you press the USAGE key, the thermostat
displays the next usage value.
If you do not subscribe to Time-of-Use Pricing,
the thermostat displays current usage the first
time you press the USAGE key and accumulated usage the next time you press the USAGE
key.
If you subscribe to Time-of-Use Pricing, there
are eight usage values that can be displayed.
The first time you press the USAGE key, the
thermostat displays the current usage value for
rate 1. Each time you press the USAGE key
again, usage values for rates 2, 3 and 4 are
then displayed. If you continue to press the
USAGE key, accumulated usage values are
displayed for rates 1 through 4.
Press the RUN PROGRAM key to stop viewing
usage.
Current day usage is automatically cleared at
midnight. To clear an accumulated value, press
the USAGE key until the value you want to
clear is displayed and then press the CLEAR
key. If you subscribe to Time-of-Use Pricing,
17 69-0989—1
your utility can also clear the accumulators by
sending a message to the thermostat.
pressing the RUN PROGRAM key will cancel
your change.
Permanently Change a Program
To permanently change a program, repeat the
appropriate steps in Programming Your
Thermostat.
Return to Normal Program
or Start Program
Any time you want to return to the normal
program or start the program, press the RUN
PROGRAM key. If you temporarily changed the
temperature or you used the HOLD TEMP key,
Change Fan or System Control Settings
Change the fan setting by pressing the FAN
key. Each time you press the key, the fan status
changes to the next setting. When FAN is
displayed, the fan is on continuously. When
nothing is displayed, the fan is in AUTO mode (it
comes on with the heating or cooling
equipment, as needed).
Change the system setting by pressing the
SYSTEM key. Each time you press the key, the
system status changes to the next setting.
18 69-0989—1
THERMOSTAT OPERATION
WHEN SPECIAL PROGRAMS
ARE IN EFFECT
Normally your thermostat operates as you
programmed it. If you subscribe to either of the
following special programs, there may be times
when it does not operate as you expect. Before
calling for service, read the following
information.
Direct Load Control (DLC)
When the thermostat is operating under Direct
Load Control, the amount of time your heating/
cooling system can operate is controlled by
radio signal from your utility company. If you
notice the temperature in your home is higher or
lower than the setting you programmed into the
thermostat, check the thermostat display. To
indicate the equipment is under Direct Load
Control, the thermostat displays the word
SAVING. You cannot control the heating/cooling
equipment when it is under Direct Load Control.
When the utility releases your thermostat from
Direct Load Control, your heating or cooling
equipment may not be immediately available. To
prevent damage to your heating and cooling
equipment and to allow the utility to bring the
equipment of all homes that subscribe to Direct
19 69-0989—1
Load Control on-line effectively, your thermostat
automatically calculates and initiates a time
delay before the heating or cooling equipment
comes on. You cannot override this time delay.
Time-of-Use Pricing
If you subscribe to Time-of-Use Pricing, the
thermostat displays the rate in effect, see Fig. 1.
You cannot adjust which rate is in effect; you
can only adjust the temperature offset for each
rate. Refer to Programming Your Thermostat
section for information on setting the offset for
Time-of-Use Pricing. To notify you a rate
change will be occurring, the Time-of-Use
indicator on the thermostat begins blinking onehalf hour before the rate change takes effect.
When a rate change message is received by
the thermostat, your heating/cooling system
automatically operates at the temperature and
offset you programmed. You cannot temporarily
override the offset. If you need to change the
offset, refer to Programming Your Thermostat.
For additional information about either of these
programs, contact your utility company.
20 69-0989—1
REPLACING THE
THERMOSTAT BATTERIES
IMPORTANT
Batteries must be installed to maintain
the time and date in the event of a
power loss. Although the thermostat
has a low battery indicator, replace the
batteries once every two years to
prevent the thermostat from losing its
time/date information in the event of a
momentary power loss.
As the batteries run low, the display shows bAt
Lo. This low battery indication flashes for one to
two months before the batteries run out
completely. Replace the batteries as soon as
possible after the indicator starts flashing.
You will need two AA alkaline batteries; nonalkaline batteries will not last as long, and can
leak, causing damage to the thermostat or the
wall surface. We recommend Energizer®
batteries.
• Use a coin to carefully remove the battery
door.
• Press down on the left ends of the batteries
to remove them.
21 69-0989—1
• Install the fresh batteries as shown. Make
sure positive and negative terminals are
oriented correctly.
REMOVING
BATTERY
M1719C
DOOR
• Replace the battery door.
INSTALL TWO AA ALKALINE
BATTERIES AS SHOWN
M7905
22 69-0989—1
TROUBLESHOOTING GUIDE
IF... THEN…
Display will not come on. • There is no power applied to the thermostat. Check fuse or
circuit breaker.
Temperature display will not • You have reached the temperature setting limit. The setting
go lower than 45
than 88°F during programming.
Temperature change occurs • Check the program times for the period in question. Be sure
at the wrong times. that AM and PM indications are correct. Make sure the
°F or higher range is 45°F to 88°F.
current day and time are correct. Reprogram if necessary.
• Keep in mind that it takes time for the system to recover.
Read Recovery from Setback section.
23 69-0989—1
Heating will not come on. • Check that the system control on the thermostat is set to
HEAT.
• Check the display. If SAVING is displayed, you are in Direct
Load Control mode and your thermostat is under control of
the utility. Heating may not come on until Direct Load
Control period ends.
• If the temperature setting is higher than current temperature, and the display says HEAT, contact your utility
company.
Cooling will not come on. • Check that the system control on the thermostat is set to
COOL.
• Check the system fuse or circuit breaker and replace or
reset, if necessary.
24 69-0989—1
• Check the display. If SAVING is displayed, you are in Direct
Load Control mode and your thermostat is under control of
the utility. Cooling may not come on until the Direct Load
Control period ends.
• The thermostat has a built-in time delay on cooling. Allow
five to ten minutes after changing the setting before the air
conditioner starts to prevent equipment damage.
• If temperature setting is lower than current temperature,
and the display shows COOL, set the system control to the
OFF setting for ten minutes. After ten minutes, return the
system control to the COOL setting. If the air conditioner
comes on, the compressor may have reached its high limit
temperature protection and shutdown. If the air conditioner
does not come on after ten minutes and the display shows
COOL, contact your utility.
25 69-0989—1
The house is too warm or • Press PRESENT SETTING key to check the current temp
too cool. erature setting.
System ON indicator is lit, • Allow time for the furnace or heat pump to heat up and the
but no heat is coming from fan to come on before checking for heat at the register.
the registers.
• If desired, change the temperature setting. See Operating
Your Thermostat section.
• If you subscribe to Real-time Pricing, you may need to
adjust your offset temperatures to provide a more
comfortable temperature.
• Check the display. If SAVING is displayed, you are in Direct
Load Control mode and your thermostat is under control of
the utility. Cooling or heating may not come on until the
Direct Load Control period ends.
26 69-0989—1
The thermostat’s current • Be aware that it is normal for the current setting and
setting does not match display temperature to differ on occasion.
the display temperature. • During recovery from setback or setup, setting and display
Incorrect room temperature • The thermostat is factory-calibrated, and cannot be
showing on thermostat display. adjusted.
Thermostat is flashing • You are a subscriber to one of the special pricing programs
CALL <xxx-xxxx>. and your thermostat has lost communication with the utility
temperatures may differ to within ±1° for up to 30 minutes
after the recovery period.
company. Call the number displayed on the thermostat or
the number on the thermostat label for information.
27 69-0989—1
TYPICAL ENERGY SAVINGS
DC
PERCENTAGE OF HEATING ENERGY YOU CAN SAVE
o
ONE 10 F ENERGY SAVINGS PERIOD*
o
o
70 TO 60 F; 8 HRS/DAY
9% TO 11%
12% TO 13%
14% TO 15%
16% TO 18%
o
TWO 10 F ENERGY SAVINGS PERIODS*
o
o
70 TO 60 F; 8 HRS/DAY, 8 HRS/NIGHT
18% TO 24%
23% TO 25%
25% TO 29%
UP TO 30%
* Savings for a 5 F heating setback are at least
1/2 of savings for a 10 F setback.
Actual savings depend on your home, geographic location,
number of energy saving periods and energy savings temperature.
If you have a heat pump, your heating savings may be greater than those shown.
o
o
SAN FRANCISCO, CA
14% - 26%
LOS ANGELES, CA
15% - 30%
SEATTLE, WA
BILLINGS, MT
12% - 24%
PHOENIX, AZ
16% - 30%
ALBUQUERQUE, NM
12% - 24%
DALLAS, TX
DODGE CITY, KS
12% - 23%
10% - 20%
15% - 28%
NEW ORLEANS, LA
16% - 30%
CHICAGO, IL
11% - 21%
MPLS., MN
9% - 18%
ATLANTA, GA
15% - 27%
NEW YORK, NY
12% - 23%
CINCINNATI, OH
12% - 24%
GREENSBORO, NC
14% - 25%
MIAMI, FL
18% - 30%
M 167B
28 69-0989—1
PERCENTAGE OF COOLING ENERGY YOU CAN SAVE
DC
o
ONE 5 F ENERGY SAVINGS PERIOD*
o
o
75 TO 80 F; 8 HRS/DAY
7% TO 9%
10% TO 11%
12% TO 14%
SEATTLE, WA
16% - 23%
SAN FRANCISCO, CA
14% - 19%
15% TO 18%
o
TWO 5 F ENERGY SAVINGS PERIODS*
o
o
75 TO 80 F; 9 HRS/DAY, 7 HRS/NIGHT
11% TO 15%
16% TO 18%
19% TO 22%
LOS ANGELES, CA
20% - 27%
PHOENIX, AZ
16% - 30%
ALBUQUERQUE, NM
23% TO 33%
* Actual savings depend on your home, geographic location,
number of energy saving periods and energy savings temperature.
29 69-0989—1
BILLINGS, MT
12% - 24%
DALLAS, TX
15% - 28%
DODGE CITY, KS
9% - 15%
9% - 16%
NEW ORLEANS, LA
16% - 30%
CHICAGO, IL
MPLS., MN
12% - 20%
ATLANTA, GA
15% - 27%
13% - 20%
NEW YORK, NY
13% - 20%
CINCINNATI, OH
12% - 19%
GREENSBORO, NC
14% - 25%
MIAMI, FL
18% - 30%
M 211B
Toll-free Customer Assistance
For all questions concerning this thermostat, please read and follow the instructions. If additional
assistance is needed, call your utility’s Customer Assistance number.
Before you call, please have the following information available—thermostat model number and
date code, type of heating/cooling system (hot water, warm air, oil, gas, heat pump, etc).
30 69-0989—1
WARRANTY CONDITIONS
31 69-0989—1
Scientific
Atlanta
Honeywell
TM
69-0989—1 J.S. 6-96 Printed in U.S.A
32 69-0989—1
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