Honeywell Chronotherm 3 User Manual

							35
36
ANSWERING COMMON QUESTIONS ABOUT THE CHRONOTHERM III THERMOSTAT
HereÕs how to override Adaptive Intelligent Recovery
setting:
nSet the desired WAKE program temperature.
nSet the WAKE program time 30 to 60 minutes before
the time you normally get up. (You can adjust this
time. If the house reaches the comfort temperature
too early, set the time later; if it reaches the comfort
temperature too late, set the time earlier, but donÕt go
beyond 90 minutes.)
nSet the desired SLEEP program time and tempera-
ture. The SLEEP temperature must not be more than
10 degrees below the comfort setting.
nSet the RETURN program time to 10 minutes before
your programmed WAKE time.
nSet the RETURN program temperature the same as
the SLEEP temperature.
nThe LEAVE program remains blank unless you want
a day energy saving period. See page 3.
nThe thermostat will think that it doesnÕt need to start
recovery until 10 minutes before your WAKE time. It
will run the furnace constantly until the comfort
temperature is reached. 9. Can I stop the thermostat from bringing the heat
on so early in the morning? How?
T8631A has screws on the back of the thermostat
that will allow you to turn off Adaptive Intelligent
Recoveryª.
On the T8631R without the screw to override
Adaptive Intelligent Recoveryª, you will only be able
to set one completely automatic energy savings
period; the second period must be ended manually.
Also, since recovery starts at the time you pro-
grammed, the comfort temperature may not be
reached by the desired time.
EXAMPLE:
TEMPERATURE
PERIOD TIME SETTING SETTING
WAKE 5:30 AM 70° F
LEAVE Ñ Ñ
SLEEP 10:00 PM 60° F
RETURN 5:20 AM 60° F
If you want a day program:
nSet the desired LEAVE time and temperature. The
thermostat will automatically initiate an energy
savings period.nThe first person home must push the CHANGE
TO LAST PERIOD key to start warming the
house. The furnace will run constantly until the
comfort temperature is reached.
Do you have a heat pump with auxiliary heat?
If so, we donÕt recommend overriding Adaptive Intelli-
gent Recoveryª because the amount of expensive
auxiliary heat needed for recovery can cost more than
the energy saved by lowering the temperature.
10. I have a high efficiency furnace and my heat is
short cycling. What can I do?
Some high efficiency furnaces need the cycle rate set
at the Hot Water setting instead of the factory setting
of gas/oil warm air. Turn out the 1A screw with screw
1B left turned in.
Additional Questions? Call Honeywell Consumer
Services: 1-800-468-1502 Monday-Friday, 7:30 a.m. to
5:00 p.m., Central time. 
						

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38
SAVING ENERGY ACROSS THE U.S.
9% TO 11%
12% TO 13%
14% TO 15%
16% TO 18% ONE 10  F ENERGY SAVINGS PERIOD*
70  TO 60  F; 8 HRS/DAY
18% TO 24%
23% TO 25%
25% TO 29%
UP TO 30% TWO 10  F ENERGY SAVINGS PERIODS*
70  TO 60  F; 8 HRS/DAY, 8 HRS/NIGHT
M 167B o o
o
o
o
o o
o
PERCENTAGE OF HEATING ENERGY YOU CAN SAVE
* 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.
SEATTLE, WA
12% - 24%BILLINGS, MT
10% - 20%MPLS., MN
9% - 18%CHICAGO, IL
11% - 21%
CINCINNATI, OH
12% - 24%NEW YORK, NY
12% - 23%
SAN FRANCISCO, CA
14% - 26%
LOS ANGELES, CA
15% - 30%
DODGE CITY, KS
12% - 23%
If you have a heat pump, your heating savings may be greater than those shown.
DC
PHOENIX, AZ
16% - 30%
DALLAS, TX
15% - 28%
ATLANTA, GA
15% - 27%
ALBUQUERQUE, NM
12% - 24%
NEW ORLEANS, LA
16% - 30%
MIAMI, FL
18% - 30%
GREENSBORO, NC
14% - 25%  
nSave up to 30% in energy costs. Chronotherm III
Thermostats offer you complete comfort and a low-
cost easy way to save on your energy bills.
nThe energy-saving percentages listed on the maps
on pages 38 and 39 are based on setting the
thermostat 
down in winter or up in summer for eight
hours.nIf the time period you choose for setback is longer,
you may see even greater energy savings. The
energy saving period must be at least two hours long
to save any energy.Find the city closest to your home. The energy saving
listed will be similar to the saving you can expect. 
						

							39
40
7% TO 9%
10% TO 11%
12% TO 14%
15% TO 18% ONE 5  F ENERGY SAVINGS PERIOD*
75  TO 80  F; 8 HRS/DAY
11% TO 15%
16% TO 18%
19% TO 22%
23% TO 33% TWO 5  F ENERGY SAVINGS PERIODS*
75  TO 80  F; 9 HRS/DAY, 7 HRS/NIGHT
M 211B o o
o
oo
o
PERCENTAGE OF COOLING ENERGY YOU CAN SAVE
* Actual savings depend on your home, geographic location,
number of energy saving periods and energy savings temperature.
SEATTLE, WA
16% - 23%BILLINGS, MT
9% - 16%MPLS., MN
12% - 20%CHICAGO, IL
13% - 20%
CINCINNATI, OH
12% - 19%NEW YORK, NY
13% - 20%
SAN FRANCISCO, CA
14% - 19%
LOS ANGELES, CA
20% - 27%
DODGE CITY, KS
9% - 15%
DC
PHOENIX, AZ
16% - 30%
DALLAS, TX
15% - 28%
ATLANTA, GA
15% - 27%
ALBUQUERQUE, NM
12% - 24%
NEW ORLEANS, LA
16% - 30%
MIAMI, FL
18% - 30%
GREENSBORO, NC
14% - 25%  
SAVING ENERGY ACROSS THE U.S.
GLOSSARY
Adaptive Intelligent Recovery
The time when the thermostat operates the heating or
cooling equipment to return the house from the energy
savings to the comfort temperature. The thermostat
starts the recovery period early so the house will be at
the comfort setting by the time youÕve chosen.
Comfort temperature
The temperature you want in the morning and evening
when youÕre home.
Conventional Recovery
The time set for a program period when the heating or
cooling equipment will first start getting the room to the
set temperature.
Energy-saving temperature
The lower (heating) or higher (cooling) temperature that
lets you save on heating and cooling costs when youÕre
asleep or away. Also called the setback (heating) or
setup (cooling) temperature.HBus
A Honeywell proprietary communications protocol.
Period key
One of the four keysÑWAKE, LEAVE, RETURN or
SLEEPÑthat you press to check or program the start
time and temperature for a time period.
Preprogrammed schedule
The schedule programmed into your thermostat at the
factory. It sets a night program that provides energy
savings if you donÕt set your own program, or if your
personal program is lost for any reason. The program,
which is the same for all days of the week, is:
Start Temperature
Period Time Heating CoolinG
WAKE 6:00 AM 70° F78° F
LEAVE - - - - - No program - - - - - - - - - -
RETURN - - - - - No program - - - - - - - - - -
SLEEP 10:00 PM 60° F78° F 
						

							GLOSSARY
41
42
EM HT light [T8631R only] (red)Ñthis light glows
whenever the thermostat system switch is in the EM
HT position (located on subbase). On some systems
it may also indicate the need to switch to EM. HEAT
because of a problem with the heat pump.
Sunday program schedule
The schedule of WAKE, LEAVE, RETURN and SLEEP
period start times and temperatures that you program to
run on Sundays.
Time period
One of four program periods: WAKE, LEAVE, RETURN
and SLEEP available with the Chronotherm III Thermo-
stat. One period begins when the previous period ends.
WAKEÑThe time period when you want the house
at a comfortable temperature while the family gets up
and gets ready to leave for work and school. This is
the only period that must contain a time and tem-
perature.
LEAVEÑThe time period when you can set back
(winter) or up (summer) the temperature for energy
savings because the family is usually away from
home.RETURNÑThe time period when you want the
house at a comfortable temperature for family
activities in the evening before bedtime.
SLEEPÑThe time period when you can set back
(winter) or up (summer) the temperature for energy
savings because the family is sleeping. Set it to start
at your familyÕs normal bedtime. Often the SLEEP
program is set only for the heating season so family
members can sleep cool in summer.
TotalHome
A Honeywell system that lets you control your home
environment from a user interface panel. Depending on
the system chosen, you can also use a touchtone
phone to adjust your settings. TotalHome offers
convenience and flexible control of your security system
and home environment.
Weekday program schedule
The schedule of WAKE, LEAVE, RETURN and SLEEP
period start times and temperatures that you program to
run Monday through Friday.
PROGRAMMING YOUR THERMO
Program
The times and temperatures you set to define the
comfort and energy savings periods for each schedule
(weekdays, Saturday, Sunday).
Saturday program schedule
The schedule of WAKE, LEAVE, RETURN and SLEEP
period start times and temperatures that you program to
run on Saturdays.
Setback
Reducing the temperature in the house for a set period
every day in winter for energy savings. The lower
temperature is the energy savings temperature.
Setup
Raising the temperature in the house for a set period
every day in summer for energy savings. The higher
temperature is the energy savings temperature.Set point
The temperature you set on the thermostat. The
thermostat turns the heating or cooling equipment on
and off to maintain this temperature at the thermostat
location until another temperature setting goes into
effect.
STATUS LIGHTSÑLights that show system operation
settings.
SYSTEM light (yellow)ÑThis light glows whenever
the thermostat is calling for heating or cooling
(located on thermostat).
AUX HT light [T8631R only] (green)ÑThis light
glows whenever the thermostat is calling for opera-
tion of the backup heater. Backup (auxiliary) heat is
more expensive to operate than the heat pump and
typically is used only when the heat pump is unable
to handle the load (located on subbase). 
						

							Weekday Program
START HEATING COOLING
PERIOD TIME TEMPERATURE TEMPERATURE
WAKE
LEAVE
RETURN
SLEEP
Saturday Program
START HEATING COOLING
PERIOD TIME TEMPERATURE TEMPERATURE
WAKE
LEAVE
RETURN
SLEEP
43
44
YOUR THERMOSTAT
YOUR PERSONAL PROGRAM
You can use the tables below to plan your schedule
before you begin programming. If you choose not toprogram a daytime energy savings period, leave the
LEAVE and RETURN periods blank.
Sunday Program
START HEATING COOLING
PERIOD TIME TEMPERATURE TEMPERATURE
WAKE
LEAVE
RETURN
SLEEP 
						

							TROUBLESHOOTING GUIDE
IFÉ THENÉDisplay will not come on.nCheck that heat or cool system power is on. You need 24V from R to C
terminals.
nMake sure thermostat is correctly mounted on subbase.
Display flashes during programming.nYou have reached the temperature setting limit. The setting range is
45° F to 88° F.
Display flashes during operation.nProgramming has been lost because of a power outage. You must
reprogram.
Program is lost due to powernCheck that backup batteries are installed correctly. Replace if necessary.
outage.Reprogram the thermostat.
Colon in display does not flash.nCheck for 24V from R to C terminals on the subbase.
nMake sure thermostat is mounted correctly on the subbase.
Temperature change occursnCheck for s 
s on display screen. If s
s is present, check your external
at the wrong times.system for the command that is bypassing the thermostat program.
nCheck the program times for the period in question. Be sure that AM and
PM indications are correct. Make sure the current day and time are
correct. Reprogram if necessary.
nRemember that with Adaptive Intelligent Recovery the heating or
cooling system comes on 
before the WAKE and RETURN start times
so the house will be at the desired temperature when the period starts.
nCheck if T8631A is set for Conventional Recovery ( n
 n visible on display)
or Adaptive Intelligent Recovery.
Heating will not come on.nCheck the fuse or circuit breaker and replace or reset if necessary.
nCheck that switch on thermostat is set to HEAT.
nT8631R has a built-in time delay which can add to time delays in the
heating equipment. Allow up to 10 minutes after changing the setting
before the compressor starts.
nIf temperature setting is higher than current temperature, and display
says HEAT ON or SYSTEM light is on, contact your heating and air
conditioning contractor.
Cooling will not come on.nCheck the fuse or circuit breaker and replace or reset if necessary.
nCheck that switch on thermostat is set to COOL.
nThe thermostat has a built-in time delay, which can add to time delays in
the cooling equipment. Allow up to 10 minutes after changing the setting
before the compressor starts.
nIf temperature setting is lower than current temperature, and display says
COOL ON or SYSTEM light is on, contact your heating and air
conditioning contractor.
The building is too warm or too cool.nPress PRESENT SETTING to check the current temperature setting.
nIf desired, change the time or temperature setting. See page 21.
nCheck for s
s on display screen. If s
s is present, check your external
system for the command that is bypassing the thermostat program.
Display says HEAT ON or systemnAllow time for the heating equipment to heat up before
light is on, but no heat is comingchecking for heat at the register.
from the registers.
Display flashes REPL BAT ornInstall fresh AAA alkaline batteries. See page 23.
goes blank when power is turned off.
45
46 
						

							47
48
QUICK REFERENCE TO THE KEYS
Press these keys to: Begin the current day or time
programming.
Set the day of the week and select
the program day during program-
ming.
Select the time period to program or
review.
Switch between heat and cool
settings during programming or
when reviewing the program.
Set the time ahead and back. Hold
either key down to change the
setting faster.
Set the temperature while program-
ming and temporarily change the
temperature during operation. Hold
either key down to change the
setting faster.
Hold any temperature you desire for
an extended period.
Change the temperature to the set
point of the previous period.
Maintain the current temperature
through the next program period.
Start your programmed schedule;
cancel temporary program changes.
See the current temperature setting.
Setting may not match programmed
setting during recovery from energy
savings.SETPRESENT
DAY/TIME
DAY
LEAVE
RETURNSLEEP
WAKE
SETHEAT/COOL
AHEAD
BACK
WARMER
COOLER
SKIPNEXT
PERIOD
RUN
PROGRAM
PRESENT
SETTING
HOLD
TEMP
CHANGETO LAST
PERIOD 
						

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INDEX
Accessing external system control .............................. 20
Adaptive Intelligent Recovery .......................... 25-28,40
Auxiliary heat light ....................................................... 41
Batteries, replacement ................................................ 23
Blinking display ........................................................ 3,10
Canceling programs .................................................... 17
Change temperature ................................................... 15
Checking present setting ............................................. 19
Checking programs ..................................................... 18
Clock display .............................................................. *,1
Comfort temperature ................................................... 40
Conventional recovery ................................................ 40
Cooling temperatures .............................................. 7-11
Day ................................................................................ 1
Display ....................................................................... *,1
Emergency heat light .................................................. 42
Energy-saving temperature ......................................... 40Fan switch ................................................................... 12
Features ........................................................................ *
Flashing display .......................................................... 45
Glossary ................................................................ 40-42
HBus ........................................................................... 40
Heating temperatures ................................................ 2-6
Hold temperature ................................................... 16,48
Keys ...................................................................... 47-48
LEAVE .................................................................... 42,47
Lights ..................................................................... 41-42
Maintenance .......................................................... 21-24
Manual operation ........................................................ 16
Operation .............................................................. 14-20
Period keys ............................................................ 40,42
Personal program .................................................. 43-44
Power outage .............................................................. 24
Preprogrammed schedule ........................................... 40
Setting limits ............................................................... 3,8
Setup ........................................................................... 41
Skip ............................................................................. 48
Sunday program .................................................. 6,10,42
Switch, fan ................................................................... 12
Switch, system ...................................................... 12-13
System light ................................................................. 41
System switch ....................................................... 12-13
Table of Contents ........................................................... i
Temporary program changes ...................................... 14
Time .............................................................................. 1
Time period ................................................................. 42
Troubleshooting .................................................... 45-46
WAKE ..................................................................... 42,47
Warranty ...................................................................... 51
Weekday program .......................................... 2-5,7-9,42
*See the product features inside the front cover. Present setting ....................................................... 19,48
Program schedule ......................................................... 2
Programming overview ................................................. *
Programming steps ................................................. 1-13
Quick reference to the keys .................................. 47-48
Recovery Setting ................................................... 29-30
Removing thermostat .................................................. 21
Replacing batteries ..................................................... 23
RETURN ................................................................ 42,47
SLEEP .................................................................... 42,47
Saturday program ........................................... 5,9-10,41
Set cooling temperatures ........................................ 7-11
Set current day .............................................................. 1
Set current time ............................................................. 1
Set fan switch .............................................................. 12
Set heating temperatures .............................................. 2
Set program schedule ................................................... 2
Set system switch ....................................................... 12
Setback ....................................................................... 41 
						

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LIMITED ONE-YEAR WARRANTY
Honeywell warrants this thermostat, excluding battery, to be free from defects in the workmanship or materials, under normal use and service, for a period
of one (1) year from the date of purchase by the consumer. If, at any time during the warranty period, the product is defective or malfunctions, Honeywell
shall repair or replace it (at HoneywellÕs option) within a reasonable period of time.
If the thermostat is defective,
(i) return it, with a bill of sale or other dated proof of purchase, to the dealer or contractor from which you purchased it, or
(ii) package it carefully, along with proof of purchase (including date of purchase) and a short description of the malfunction, and mail it, postage
prepaid, to the following address:
Honeywell Inc.
Return Goods Department
1050 Berkshire Lane
Plymouth, MN 55441-4437
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused
by damage which occurred while the product was in the possession of a consumer.
HoneywellÕs sole responsibility shall be to repair or replace the product within the terms stated above. HONEYWELL SHALL NOT BE LIABLE FOR ANY
LOSS OR DAMAGE OF ANY KIND, INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING, DIRECTLY OR INDIRECTLY FROM
ANY BREACH OF ANY WARRANTY, EXPRESSED OR IMPLIED, OR ANY OTHER FAILURE OF THIS PRODUCT. Some states do not allow the exclusion
or limitation of incidental or consequential damages, so this limitation may not apply to you.
THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT. THE DURATION OF ANY IMPLIED WARRANTIES,
INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, IS HEREBY LIMITED TO THE ONE YEAR
DURATION OF THIS WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to
you.
This warranty gives you specific legal rights, and you may have other rights which vary from state to state.
If you have any questions concerning this warranty, please write our Consumer Services Department, Honeywell Inc. 1885 Douglas Dr. N., Golden Valley,
MN 55422-3992, or call 1-800-468-1502, Monday-Friday, 7:30 a.m. to 5:00 p.m., Central time. 
						

							Chronotherm III
for Comfort and Convenience
OWNERS GUIDE
Residential andResidential andHelping You Control Your World
Building Controls DivisionBuilding Controls Division
Honeywell Inc. Honeywell LimitedÑHoneywell LimitŽe
1985 Douglas Drive North740 Ellesmere Road
Golden Valley, Minnesota  55422Scarborough, Ontario
M1P 2V9
Congratulations! You made a smart choice when you purchased your new Honeywell Communicating
Chronotherm III Thermostat. ItÕs the smart thermostat that:
n
Keeps you comfortable by automatically calculating exactly when the furnace or air conditioning
should go on to have the house at the desired comfort temperature by the time you wake up.
n
Saves the maximum amount of energy and money by remembering to automatically set back the heat
or air conditioning when you leave home.
n
Provides the ultimate in comfort and convenience by coming to you already programmed. But itÕs your
choiceÑuse the preprogrammed schedule or set your own.
n
Can be connected to a Honeywells TotalHome  system  for external access and control. TotalHome
system devices communicate using HBus, a Honeywell communications protocol.