Honeywell T8600D Thermostat User Manual

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T8600D, T8601D and T8602D  
®
Chronotherm IV Deluxe Programmable  
Thermostats  
PRODUCT DATA  
•
•
Models available with outdoor temperature sensor  
capability for homeowner convenience.The sensor is  
also more accurate than a thermometer.  
Configurable features allows one model to be used to  
replace many different models (less inventory, no  
longer need to carry separate models to get these  
features).  
—
—
—
—
°F or °C temperature display;  
Automatic or manual changeover;  
Electric or conventional heat fan operation  
Adjustable heating cycle rate.  
•
Minimum off time for cooling compressors and heat  
pumps protects the equipment and extends the  
equipment life.  
•
•
•
Easy installation, setup and system test saves  
installer time and increases productivity.  
Self-test simplifies troubleshooting and saves time by  
overriding the time delays.  
APPLICATION  
Adaptive Intelligent Recovery™ control brings the  
room temperature to temperature setpoint at the  
programmed time, maximizing comfort and energy  
savings.  
The T8600, T8601 and T8602 Chronotherm® IV Deluxe  
Programmable Thermostats provide electronic control of  
24 Vac single-stage heating and cooling systems.  
•
•
•
Setpoints are permanently held in memory (no  
batteries used) and retained during power outages for  
increased installer and homeowner convenience.  
T8600/T8601/T8602  
FEATURES AND BENEFITS  
Power stealing, hardwired and battery powered  
models available for virtually all equipment and  
application needs.  
•
Full seven-day program capability; different schedules  
and temperature setpoints may be selected for  
Universal Versaguard™ Thermostat guards available  
for added security.  
everyday to match the homeowner’s flexible schedule.  
•
•
•
•
Copy key makes programming easier and faster for  
the installer and homeowner.  
Contents  
Daylight Savings Time (DST) key for quick change in  
and out of Daylight Savings Time.  
Application............................................................................. 1  
T8600/T8601/T8602 Features and Benefits ......................... 1  
Specifications ........................................................................ 2  
Ordering Information ............................................................. 2  
Installation ............................................................................. 4  
Wiring .................................................................................... 4  
Settings ................................................................................. 6  
Installer Setup ....................................................................... 7  
Installer Self-Test................................................................. 10  
Thermostat Information ....................................................... 11  
Programming....................................................................... 11  
Operation ............................................................................ 16  
Troubleshooting Guide ........................................................ 17  
Cross Reference ................................................................. 19  
Wiring Diagrams (Fig. 15-20) .............................................. 24  
Models available with programmable fan operation for  
added homeowner comfort.  
Easy temporary temperature setpoint changes for  
current period, vacation hold (1 to 255 days) or  
indefinite hold adds to the homeowner comfort and  
energy savings.  
•
Frequently used keys are located by the Liquid Crystal  
Display (LCD) for quick and easy access to  
information.  
•
•
Attractive styling complements any decor to the  
homeowner’s delight.  
Back lighting the large display makes the LCD very  
easy to read.  
®
U.S. Registered Trademark  
Copyright © 1997 Honeywell Inc.  
•
•
All Rights Reserved  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
System Current Load Ratings:  
SPECIFICATIONS  
6
VA maximum at 30 Vac, 50/60 Hz.  
IMPORTANT  
The specifications given in this publication do not  
Output Relay Load Rating:  
See Table 2.  
include normal manufacturing tolerances. Therefore,  
this unit might not exactly match the listed  
specifications. This product is tested and calibrated  
under closely controlled conditions, and some minor  
differences in performance can be expected if those  
conditions are changed.  
Temperature:  
Ratings:  
Operating Ambient: 40°F to 110°F (4°C to 43°C).  
Shipping: -30°F to +150°F (-34°C to +65°C).  
Display Accuracy: ±1°F (±0.5°C).  
Setpoint:  
Thermostat Models  
Range:  
T8600, T8601 and T8602 Thermostats provide features listed  
in Table 1.  
Heating: 40°F to 90°F (4.5°C to 32°C).  
Cooling: 45° F to 99°F (7°C to 35°C)  
Differential: 3°F (1.5°C).  
Default Settings: see Table 3.  
Electrical Rating (Nominal Range):  
24 Vac, 50/60 Hz.  
2
0 to 30 Vac, 50/60 Hz.  
Minimum Stage Operation Time:  
Minimum Off (Heat and Cool ): factory setting 5 minutes;  
option 0 to 5 minutes.  
Batteries:  
Only T8602 models require batteries.  
Humidity Ratings:  
Loss of Power:  
5% to 90% RH, noncondensing.  
The thermostat will maintain programmed times and  
temperatures for the life of the product. The clock and day  
information is retained for a minimum of thirty minutes.  
Clock Accuracy:  
1 minute per month.  
+
Table 1.Thermostat Features.  
System  
Selection  
Fan  
Selection  
System Changeover  
Comments  
T8600 (powered by either the heating or cooling system)  
Heat-Cool Automatic Heat-Off-Cool-Auto On-Auto  
T8601 (powered by common wire to supply power)  
D
System and fan selections are done by keyboard.  
System and fan selections are done by keyboard.  
System and fan selections are done by keyboard.  
D
Heat-Cool Automatic  
T8602 (powered by batteries)  
Heat-Cool Automatic  
Heat-Off-Cool-Auto On-Auto  
D
Heat-Off-Cool-Auto On-Auto  
ORDERING INFORMATION  
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the  
TRADELINE® Catalog or price sheets for complete ordering number.  
If you have additional questions, need further information, or would like to comment on our products or services, please write or  
phone:  
1
2
.
.
Your local Home and Building Control Sales Office (check white pages of your phone directory).  
Home and Building Control Customer Logistics  
Honeywell Inc., 1885 Douglas Drive North  
Minneapolis, Minnesota 55422-4386  
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.  
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,  
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 2. Maximum Amps at 30 Vac.  
Finish:  
Taupe color.  
Relay  
Running (A)  
Inrush (A)  
Fan  
Heat  
Cool  
0.5  
1.5  
1.5  
2.5  
3.5  
7.5  
Dimensions:  
See Fig. 1.  
Mounting Means:  
The thermostat mounts on a wallplate. The wallplate mounts  
horizontally on a wall or outlet box with two no. 6 x 32 screws  
Table 3. Default Setpoints.  
(included).  
Heat  
Setpoint  
Cool  
Setpoint  
Fan  
Setting  
Period  
Time  
Accessories:  
C7089B Outdoor Temperature Sensors (69-1020).  
Universal Versaguard™ Thermostat guards.  
Wake  
Leave  
Return  
Sleep  
6:00 AM  
70°F  
78°F  
(25.5°C)  
Auto  
(21°C)  
8:00 AM  
6:00 PM  
10:00 PM  
62°F  
16.5°C)  
70°F  
85°F  
(29.5°C)  
Auto  
Auto  
Auto  
RECYCLING NOTICE  
(
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash.  
78°F  
(25.5°C)  
(21°C)  
62°F  
82°F  
(16.5°C)  
(28°C)  
Contact your local waste management authority for  
instructions regarding recycling and the proper  
disposal of the old thermostat.  
3-5/8 (92)  
2-3/4 (70)  
3/8 (10)  
1-13/16  
(46)  
3
(
-1/2  
89)  
1-9/16  
(40)  
6-1/16 (154)  
1/2  
(13)  
3
(
-3/4  
95)  
M10359  
Fig. 1. Dimensions of thermostat in in. (mm).  
3
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
1
. Position and level the wallplate (for appearance only).  
The thermostat will function properly even when not  
level.  
INSTALLATION  
2
3
. Use a pencil to mark the mounting holes. See Fig. 3.  
. Remove the wallplate from the wall and drill two 3/16  
inch holes in the wall (if drywall) as marked. For firmer  
material such as plaster, drill two 7/32 inch holes.  
Gently tap anchors (provided) into the drilled holes until  
flush with the wall.  
When Installing this Product...  
1
. Read these instructions carefully. Failure to follow the  
instructions can damage the product or cause a  
hazardous condition.  
2
. Check the ratings given in the instructions and on the  
product to make sure the product is suitable for your  
application.  
4. Position the wallplate over the holes, pulling wires  
through the wiring opening.  
3. Installer must be a trained, experienced service  
technician.  
5
6
. Loosely insert the mounting screws into the holes.  
. Tighten mounting screws.  
4. After completing installation, use these instructions to  
check out the product operation.  
WIRING  
Location  
Install the thermostat about 5 ft (1.5m) above the floor in an  
area with good air circulation at average temperature. See  
Fig. 2.  
All wiring must comply with local electrical codes and  
ordinances. Follow equipment manufacturer wiring  
instructions when available. Refer to Fig. 15 through 20 for  
typical hookups. A letter code is located near each terminal  
for identification. Refer to Table 4 for terminal designations.  
Do not install the thermostat where it can be affected by:  
—
—
—
—
—
drafts, or dead spots behind doors and in corners.  
hot or cold air from ducts.  
radiant heat from sun or appliances.  
concealed pipes and chimneys.  
unheated (uncooled) areas such as an outside wall  
behind the thermostat.  
CAUTION  
Disconnect power before wiring to prevent electrical  
shock or equipment damage.  
1
. Loosen the terminal screws on the wallplate and  
connect the system wires. See Fig. 4  
Wallplate Installation  
The thermostat can be mounted horizontally on the wall or on  
a 2 in. x 4 in. wiring box. Position wallplate horizontally on the  
wall or on a 2 in. x 4 in. wiring box.  
YES  
NO  
NO  
5
FEET  
[
1.5 METERS]  
NO  
M10106  
Fig. 2.Typical location of thermostat.  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
WALL  
WIRES  
THROUGH WALL  
WALL  
ANCHORS  
(2)  
FOR STRAIGHT  
INSERTION STRIP  
FOR WRAPAROUND  
INSERTION STRIP  
5/16 IN. (8 MM).  
7/16 IN. (11 MM).  
M4826  
Fig. 4. Proper wiring technique.  
MOUNTING  
HOLES  
Mounting Thermostat Wallplate  
MOUNTING  
SCREWS  
The thermostat mounts on the wallplate after they are  
installed.  
1. Engage tabs at the top of thermostat and wallplate. See  
Fig. 5.  
M15044  
2. Press lower edge of case to latch.  
Fig. 3. Mounting the wallplate.  
NOTE: To remove the thermostat from the wall, first pull out  
at the bottom of the thermostat; then remove the top.  
IMPORTANT  
Use 18 gauge, color-coded thermostat cable for  
proper wiring.  
2. Securely tighten each terminal screw.  
3. Push excess wire back into the hole.  
4. Plug the hole with nonflammable insulation to prevent  
drafts from affecting the thermostat.  
Table 4.Terminal Designations and Descriptions.  
Standard  
Terminal  
Designations  
Alternate  
Terminal  
Designations  
Typical Connection  
Heating damper or changeover valve  
Common  
Function  
Output  
Terminal Type  
B
—
24V powered contact  
a
C
G
O
B , C, X1, X2  
Input  
F
Fan relay  
Output  
Output  
Input  
24V powered contact  
R
Cooling damper or changeover valve  
Outdoor temperature sensor (C7089B)  
24V system or heating transformer  
24V cooling transformer  
Heating relay  
24V powered contact  
OT, OT  
R
—
—
V
Input  
—
RC  
—
Input  
—
W
H1, R3  
C1, M  
Output  
Output  
24V powered contact  
24V powered contact  
Y
a
Compressor contactor  
Some OEM models label the terminal for transformer common B.  
5
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
A. ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.  
SETTINGS  
Using Thermostat Keys  
The thermostat keys are used to:  
•
•
•
•
•
•
•
•
•
set current day and time,  
program times and setpoints for heating and cooling,  
temporarily override program temperatures,  
display present setting,  
configure Installer Setup,  
check System Test,  
display outdoor temperature (select models),  
set the system operation,  
set the fan operation.  
B. PRESS LOWER EDGE OF CASE TO LATCH.  
See Fig. 6 for the location of the keys.  
System and Fan Settings  
The system default setting is Heat and the fan default setting  
is Auto. Use the System and Fan keys to change the settings.  
See Fig. 7. The fan settings can be set for each program  
period individually. The system selection is for all the program  
periods.  
M15043  
Fig. 5. Mounting thermostat on wallplate.  
SET WAKE TIMES  
AND SETPOINTS  
INCREASE TEMPERATURE  
SETTING OR SCROLL  
FORWARD THROUGH  
SET LEAVE TIMES  
AND SETPOINTS  
INCREASE TIME SETTING  
OR SCROLL FORWARD  
THROUGH INSTALLER SETUP  
AND SYSTEM TEST  
INSTALLER SETUP OPTIONS  
SET RETURN TIMES  
AND SETPOINTS  
DECREASE TEMPERATURE  
SETTING OR SCROLL  
BACKWARD THROUGH  
INSTALLER SETUP OPTIONS  
SET CURRENT  
DAY AND TIME  
DISPLAY INFORMATION  
SUCH AS PRESENT  
SETTINGS AND OUTDOOR  
TEMPERATURE  
RETURN TO  
NORMAL  
OPERATIONS  
ENTER  
INDEFINITE  
OR TIMED  
SET SLEEP  
TIMES AND  
SETPOINTS  
Time  
Set Program  
Run  
Program  
Set Current  
Day/Time  
Wake  
Leave  
Return  
Sleep  
HOLD MODE  
SELECT FAN  
OPERATION  
Heat/Cool  
Settings  
Hold Temp  
Day  
System  
Fan  
Daylight  
Time  
Copy  
SET CURRENT OR  
PROGRAM DAY  
SELECT SYSTEM  
OPERATION  
CHANGE BETWEEN  
DAYLIGHT SAVINGS  
AND STANDARD TIME  
CHANGE BETWEEN  
HEATING AND COOLING  
SETPOINTS  
COPY ONE PROGRAMMED  
DAY TO ANOTHER DAY  
DECREASE TIME SETTING  
OR SCROLL BACKWARD  
THROUGH INSTALLER  
SETUP AND SYSTEM TEST  
M10405A  
Fig. 6. Key locations and descriptions.  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
System settings control the thermostat operation as follows:  
Heat: The thermostat controls the heating.  
Off: Both the heating and cooling are off.  
Cool: The thermostat controls the cooling.  
Auto: The thermostat automatically changes between  
heating and cooling operation, depending on the indoor  
temperature.  
The Installer Setup is used to customize the thermostat to  
specific systems. Some of the options include temperature  
display, changeover and outdoor temperature display. Installer  
Setup numbers are listed in Table 6. The table includes all the  
configuration options and the factory-settings for the  
thermostat.  
A combination of key presses are required to use the Installer  
Setup feature.  
Fan settings control the system fan as follows:  
On: Fan operates continuously.  
—
To enter the Installer Setup, press and hold the  
Information i key with the increase ▲ and decrease ▲  
keys until the first number is displayed. All display  
segments appear for approximately three seconds before  
the number is displayed. See Fig. 8 and 9.  
To advance to the next Installer Setup, press the Time ▲  
key.  
To change a setting, use the increase ▲ or decrease ▲  
key.  
To scroll the Installer Setup numbers backwards, press  
the Time ▲ key.  
To exit the Installer Setup, press Run Program.  
Auto: Fan operates with equipment.  
—
—
—
—
Time  
Set Program  
Leave  
Return  
Run  
Program  
Set Current  
Day/Time  
Wake  
Sleep  
Fan  
System  
Fan  
Hold Temp  
Day  
H Se ea t tt /i Cn go so l  
System  
Daylight  
Time  
Copy  
Set Program Start Time Set Day/Time Temporary Setting Enrg  
Sav  
Hold for  
AM  
PM  
Em Ht  
Room  
%Humid  
Outdoor  
Aux Ht  
MonTueWedThuFriSatSun  
Heat Cool  
Auto Repl Batt  
Fan  
M15042  
WakeLeaveReturnSleep In Recovery  
DST  
Em Heat OffCool Auto Wait  
Fig. 7.Thermostat System and Fan key locations.  
System  
OnAuto  
M10345  
NOTE: Always press the keys with your fingertip or similar  
blunt tool. Sharp instruments like a pen or pencil  
point can damage the keyboard.  
Fig. 8. Display of all the segments of the LCD.  
Temperature Settings  
Refer to Table 5 for the default program. If the daytime energy  
savings period is not used, press the period key (Leave or  
Return) until the time is blank. The fan setting feature is  
available on select thermostat models. See Programming  
Section for complete instructions on changing the program.  
Table 5. Default Program Settings.  
M10404  
INSTALLER SETUP  
NUMBER DISPLAY  
FACTORY SETTING  
OR OTHER CHOICE  
DISPLAY (COLUMN 3  
OR 5 OF TABLE 6)  
(COLUMN 2  
Heat  
Setpoint  
Cool  
Setpoint  
Fan  
Setting  
OF TABLE 6)  
Period  
Time  
Fig. 9. Display of Installer Setup number and setting.  
Wake  
6:00 AM  
70°F  
78°F  
(25.5°C)  
Auto  
Auto  
Auto  
Auto  
(21°C)  
Leave  
Return  
Sleep  
8:00 AM  
6:00 PM  
10:00 PM  
62°F  
16.5°C)  
70°F  
85°F  
(29.5°C)  
CAUTION  
(
Heat pump and electric heat systems must be  
configured to 1 in Installer Setup number 2 to prevent  
equipment damage caused by the system running  
without the fan.  
78°F  
(25.5°C)  
(
21°C)  
62°F  
82°F  
(16.5°C)  
(28°C)  
IMPORTANT  
Only configurable numbers are shown on the device.  
Example: If thermostat does not have a system key,  
Installer Setup Number 12 will not be displayed.  
Review Table 6 factory-settings and mark any  
desired changes in the Actual Settings column.  
When Installer Setup is complete, review the settings  
to confirm that they match the system.  
INSTALLER SETUP  
NOTE: For most applications, the thermostat factory-  
settings will not need to be changed. Review the  
factory settings in Table 6 and if no changes are  
necessary, go to the Installer System Test section.  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 6.Thermostat Installer Setup Options.  
Installer Setup  
Other Choices  
Number (Press  
Factory-Setting  
Display Description  
(Press ▲ or ▲ key to change)  
Time ▲ key to  
Actual  
change)  
Setting  
Select  
Not used  
Display  
Description  
1
—
—
—
1
—
—
a
2
0
Conventional  
Heat pump or electric heat  
applications where thermostat  
controls fan operation in heat  
mode  
Fan operation  
applications where  
equipment controls fan  
operation in heat mode  
Not used  
3
4
—
6
—
—
—
—
Heating cycle  
rate  
6—6 cph used for  
conventional heat  
1, 3 or 9  
1—1 cph used for radiant floor  
heat, gravity system  
3
—3 cph used for hot water  
systems or high efficiency  
furnaces  
9—9 cph used for electric heat  
systems  
Not used  
5 thru 11  
—
1
—
—
—
—
—
System setting 12  
adjustment  
Manual changeover  
0 or 2  
0—Auto changeover  
2—Fixed auto changeover  
Adaptive  
Intelligent  
Recovery™  
control  
13  
0
Adaptive Intelligent  
Recovery™ control is  
activated (system  
starts early so setpoint  
is reached by start of  
program period)  
1
Conventional recovery (system  
starts recovery at programmed  
time)  
Degree  
temperature  
display  
14  
0
Temperature is  
displayed in °F  
1
Temperature is displayed in °C  
Not used  
15  
—
0
—
—
1
—
—
—
Clock format  
Not used  
16  
12-hour clock format  
—
24-hour clock format  
—
17 and 18  
19  
—
0
—
1
Extended fan  
operation in  
No extended fan  
operation after the call  
for heat ends  
Fan operation is extended 90  
seconds after the call for heat  
ends.  
a
heating  
Extended fan  
operation in  
cooling  
20  
0
No extended fan  
operation after the call  
for cool ends  
1
Fan operation is extended 90  
seconds after the call for cool  
ends.  
Not used  
21 thru 23  
24  
—
0
—
—
1
—
—
—
Outdoor  
No outdoor  
temperature is  
displayed  
Outdoor temperature is  
displayed. Needs a  
C7089B1000 Outdoor Sensor  
to operate  
temperature  
display (select  
models)  
Not used  
25 thru 29  
30  
—
3
—
—
—
Deadband  
Heating and cooling  
setpoints can be set  
no closer than 3°F  
4 thru 10 Heating and cooling setpoints  
can be set no closer than the  
chosen value:  
(1.5°C)  
4—4°F (2°C)  
5—5°F (2.5°C)  
6—6°F (3°C)  
7—7°F (3.5°C)  
8—8°F (4°C)  
9—9°F (4.5°C)  
10—10°F (5°C)  
a
Number 2 must be set to 1 to extend fan operation.  
(continued)  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 6. Thermostat Installer Setup Options (continued).  
Installer Setup  
Other Choices  
(Press ▲ or ▲ key to change)  
Number (Press  
Time ▲ key to  
Factory-Setting  
Display Description  
Actual  
change)  
Setting  
Select  
Not used  
Display  
Description  
31 and 32  
—
—
—
—
—
Minimum off time 33  
for the  
compressor  
5
5 minute minimum off 0 thru 4  
time for the  
compressor  
Minimum number of minutes (0  
thru 5) the compressor will be  
off between calls for the  
compressor  
Temperature  
range stops in  
heating  
34  
35  
90  
45  
Highest setpoint  
heating can be set to  
40 to 89  
46 to 99  
Temperature range (1°F  
increments) heating setpoint  
can be set to  
Temperature  
range stops in  
cooling  
Lowest setpoint  
cooling can be set to  
Temperature range (1°F  
increments) cooling setpoint  
can be set to  
Not used  
36  
37  
—
0
—
—
—
—
Temperature  
display  
adjustment  
No difference in  
displayed temperature  
and actual room  
temperature  
3 thru -3  
1—Display adjusts to 1°F  
higher than actual room  
temperature  
2—Display adjusts to 2°F  
higher than actual room  
temperature  
3
—Display adjusts to 3°F  
higher than actual room  
temperature  
-1—Display adjusts to 1°F lower  
than actual room temperature  
-2—Display adjusts to 2°F lower  
than actual room temperature  
-3—Display adjusts to 3°F lower  
than actual room temperature  
a
Number 2 must be set to 1 to extend fan operation.  
IMPORTANT  
2. Press Day until the current day is displayed.  
Review the settings to confirm that they match the  
system. Press Run Program to exit the Installer  
Setup. The thermostat has saved the Installer Setup  
changes and initiated a reset in order to operate with  
these new settings. Be sure to set the current day  
and time immediately.  
NOTE: Sun=Sunday, Mon=Monday, Tue=Tuesday,  
Wed=Wednesday, Thu=Thursday, Fri=Friday,  
Sat=Saturday.  
Set Day/Time  
PM  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Day  
Settings  
Heat/Cool  
Hold Temp  
Day  
System  
Setting Current Day and Time  
DaT  
y
i ml ig  
e
ht  
Copy  
M10313  
1. Press Set Current Day/Time.  
3. Press Time ▲ or Time ▲ until the current time is  
displayed.  
NOTE: On initial power up or after an extended power  
loss, 1:00 pm flashes on the display until a key  
is pressed.  
NOTE: Tapping the Set Current Day/Time will change  
the time in one hour increments.  
Time  
Set Day/Time  
Set Day/Time  
AM  
PM  
Time  
Set Program  
Leave  
Return  
Time  
Set Program  
Leave  
Return  
Set Current  
Day/Time  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
Hold Temp  
Day  
Settings  
Heat/Cool  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
Time  
Daylight  
Copy  
M10312  
M10314  
9
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
NOTE: If the current time is Daylight Savings Time,  
Set Program Start Time Set Day/Time Temporary Setting Enrg  
press Daylight Time until DST is displayed.  
Sav  
Hold for  
AM  
PM  
Em Ht  
Room  
%Humid  
Outdoor  
Set Day/Time  
Aux Ht  
AM  
Time  
Set Program  
Leave  
Return  
MonTueWedThuFriSatSun  
Heat Cool  
WakeLeaveReturnSleep In Recovery  
Auto Repl Batt  
Fan  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Daylight  
Time  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DST  
DaT  
y
i ml ig  
e
ht  
Copy  
System  
DST  
M10315  
Em Heat OffCool Auto Wait  
OnAuto  
M10345  
4. Press Run Program.  
Fig. 10. Display of all the segments of the LCD.  
AM  
Room  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Wake  
System  
Heat  
Run  
Program  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DST  
Fan  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
M10316  
INSTALLER SYSTEM TEST  
TEST NUMBER  
M10257A  
Fig. 11. Display of test number.  
Use the Installer System Test to check the thermostat operation.  
Refer to Table 7 for a list of the available system tests.  
Table 7.Tests Available in Installer System Test.  
To start the system test:  
Test  
Number  
0-19  
30-39  
0-49  
System Test Description  
1
Heating equipment can be turned on and off  
Cooling equipment can be turned on and off  
Fan equipment can be turned on and off  
CAUTION  
The minimum off time for compressors is bypassed  
during the Installer System Test. Equipment damage  
can occur if the compressor is cycled too quickly.  
4
60 0 to Keyboard keys test  
Press and hold the increase ▲ and ▲ decrease keys, at the  
same time, until 10 appears. All segments of the display are  
displayed for three seconds before 10 appears. See Fig. 10  
and 11.  
60 19  
70-79  
Thermostat information including date code and  
software versions are displayed  
Refer to Table 8 for the directions and results of the specific  
tests.  
NOTE: Press Time ▲ to advance to the next test and Time  
▲
to go to the previous test. Press Run Program to  
exit the system test.  
Table 8. Installer System Test Options.  
Test  
Number  
Key to Press  
Description  
Heating Equipment System Test  
Time ▲  
10  
11  
10  
Enter heating equipment system test.  
▲
▲
Heat comes on. When Installer Setup number 2 is 1, the system fan is also energized.  
Heat and system fan turn off.  
Cooling Equipment System Test  
Time ▲  
30  
31  
30  
Change from heating to cooling equipment system test.  
Cool and system fan come on.  
▲
▲
Cool and system fan turn off.  
Fan Equipment System Test  
Time ▲  
40  
41  
40  
Change from cooling to fan equipment system test.  
▲
▲
Fan comes on.  
Fan turns off.  
Key Operation System Test  
Time ▲  
60 2  
Change from fan to key operation system test.  
10  
6
8-0164—1  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
NOTE: Press any key and the numbers will change on the  
PROGRAMMING  
display. Press Time ▲ to scroll backwards and Time  
▲
to scroll forward. The Run Program, Key will not  
The keyboard is located behind the thermostat cover with  
three frequently used keys by the display. The thermostat  
display shows day, time, program period, temperature, system  
and fan operation selection.  
exit from this test. To exit, go to a different test and  
press Run Program.  
THERMOSTAT INFORMATION  
The thermostat can be set for four times and up to eight  
temperatures for each day of the week (28 independent time  
and 56 temperature settings). The ▲ and ▲ keys provide  
quick temporary temperature changes to increase comfort.  
The Hold Temp key provides energy efficient operation for  
extended periods of time.  
1
. Press the Time ▲ key to access the thermostat  
information.  
Before starting the programming procedure, use Table 9 to  
organize the program schedule. The factory preprogrammed  
time, temperature and fan settings are shown in brackets. If a  
daytime energy savings period is not used, press the period  
key (Leave or Return) until the time is blank. The fan setting  
feature is available on select thermostat models.  
M4934  
2
. Press the increase ▲ key to display the production date  
code. The first two large digits are the month and the  
third digit is the last digit of the year (Example:  
Setting the Current Day and Time  
027=February 1997).  
IMPORTANT  
Always press the keys with your fingertip or similar  
blunt tool. Sharp instruments like pens and pencil  
points can damage the keyboard.  
1. Press Set Current Day/Time.  
M10351  
NOTE: On initial power up or after an extended power  
loss, 1:00 pm flashes on the display until a key  
is pressed.  
3
. Press the increase ▲ key again to display the software  
identification code. (Example: 02 = software ID code 2)  
Set Day/Time  
PM  
Time  
Set Program  
Leave  
Return  
Set Current  
Day/Time  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
DaT  
y
i ml ig  
e
ht  
Copy  
M10312  
M4932A  
2
. Press Day until the current day is displayed.  
4
. Press the increase ▲ key again to display the software  
revision number (Example: 001=Revision number 1).  
NOTE: Sun = Sunday, Mon = Monday, Tue = Tuesday,  
Wed = Wednesday, Thu = Thursday, Fri =  
Friday, Sat = Saturday.  
Set Day/Time  
PM  
M10229  
Run  
Set Current  
Time  
Set Program  
Leave  
Return  
Program  
Day/Time  
Wake  
Sleep  
Fan  
Tue  
Day  
Settings  
Heat/Cool  
Hold Temp  
Day  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
5
. Press the increase ▲ key again to display the EEPROM  
identification code. (Example: 314 = EEPROM ID 314)  
. Press the Run Program key to exit the system test. The  
M10313  
3
. Press Time ▲ or Time ▲ until the current time is  
6
displayed.  
NOTE: Tapping the Set Current Day/Time will change  
the time in one hour increments.  
Time  
M4933A  
Set Day/Time  
AM  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
system test times out after five minutes without any key  
presses.  
Hold Temp  
Day  
Settings  
Heat/Cool  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
M10314  
1
1
68-0164—1  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
NOTE: If the current time is Daylight Savings Time,  
Programming the First Day  
press Daylight Time until DST is displayed.  
Start by programming the Wake time and temperature (and  
fan operation on select models) for any one day:  
1. Press Wake.  
Set Day/Time  
AM  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Daylight  
Time  
Set Program Start Time  
Setting  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DST  
AM  
DaT  
y
i ml ig  
e
ht  
Copy  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Wake  
System  
Heat  
Heat  
M10315  
Wake  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
Fan  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
M10317  
4. Press Run Program.  
AM  
Room  
Time  
Set Program  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Leave  
Return  
Sleep  
Tue  
Wake  
System  
Heat  
Run  
Program  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
Fan  
DST  
Fan  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
M10316  
Table 9. Default Time, Setpoints and Fan Settings.  
Heat Setpoint Cool Setpoint  
Period  
Start Time  
Fan Setting  
Monday  
Wake [6:00 AM]  
Leave [8:00 AM]  
Return [6:00 PM]  
Sleep [10:00 PM]  
Tuesday  
[70°F (21°C)]  
[62°F (16.5°C)]  
[70°F (21°C)]  
[62°F (16.5°C)]  
[78°F (25.5°C)]  
[Auto]  
[Auto]  
[Auto]  
[Auto]  
[85°F (29.5°C)]  
[78°F (25.5°C)]  
[82°F (28°C)]  
Wake [6:00 AM]  
Leave [8:00 AM]  
Return [6:00 PM]  
Sleep [10:00 PM]  
Wednesday  
[70°F (21°C)]  
[62°F (16.5°C)]  
[70°F (21°C)]  
[62°F (16.5°C)]  
[78°F (25.5°C)]  
[85°F (29.5°C)]  
[78°F (25.5°C)]  
[82°F (28°C)]  
[Auto]  
[Auto]  
[Auto]  
[Auto]  
Wake [6:00 AM]  
Leave [8:00 AM]  
Return [6:00 PM]  
Sleep [10:00 PM]  
Thursday  
[70°F (21°C)]  
[62°F (16.5°C)]  
[70°F (21°C)]  
[62°F (16.5°C)]  
[78°F (25.5°C)]  
[85°F (29.5°C)]  
[78°F (25.5°C)]  
[82°F (28°C)]  
[Auto]  
[Auto]  
[Auto]  
[Auto]  
Wake [6:00 AM]  
Leave [8:00 AM]  
Return [6:00 PM]  
Sleep [10:00 PM]  
Friday  
[70°F (21°C)]  
[62°F (16.5°C)]  
[70°F (21°C)]  
[62°F (16.5°C)]  
[78°F (25.5°C)]  
[85°F (29.5°C)]  
[78°F (25.5°C)]  
[82°F (28°C)]  
[Auto]  
[Auto]  
[Auto]  
[Auto]  
Wake [6:00 AM]  
Leave [8:00 AM]  
Return [6:00 PM]  
Sleep [10:00 PM]  
Saturday  
[70°F (21°C)]  
[62°F (16.5°C)]  
[70°F (21°C)]  
[62°F (16.5°C)]  
[78°F (25.5°C)]  
[85°F (29.5°C)]  
[78°F (25.5°C)]  
[82°F (28°C)]  
[Auto]  
[Auto]  
[Auto]  
[Auto]  
Wake [6:00 AM]  
Leave [8:00 AM]  
Return [6:00 PM]  
Sleep [10:00 PM]  
[70°F (21°C)]  
[62°F (16.5°C)]  
[70°F (21°C)]  
[62°F (16.5°C)]  
[78°F (25.5°C)]  
[85°F (29.5°C)]  
[78°F (25.5°C)]  
[82°F (28°C)]  
[Auto]  
[Auto]  
[Auto]  
[Auto]  
(continued)  
68-0164—1  
12  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 9. Default Time, Setpoints and Fan Settings (continued).  
Period  
Start Time  
Heat Setpoint  
Cool Setpoint  
Fan Setting  
Sunday  
Wake [6:00 AM]  
Leave [8:00 AM]  
Return [6:00 PM]  
Sleep [10:00 PM]  
[70°F (21°C)]  
[78°F (25.5°C)]  
[Auto]  
[62°F (16.5°C)]  
[70°F (21°C)]  
[62°F (16.5°C)]  
[85°F (29.5°C)]  
[78°F (25.5°C)]  
[82°F (28°C)]  
[Auto]  
[Auto]  
[Auto]  
2. Press Day until the desired day is displayed.  
6. Press increase ▲ or decrease ▲ key until the desired  
temperature setpoint is displayed.  
Set Program Start Time  
Setting  
AM  
Time  
Set Program  
Leave  
Return  
Set Program Start Time  
Setting  
ProR  
g
u
r
n
am  
S De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
Heat  
Day  
Settings  
Heat/Cool  
Wake  
System  
Heat  
AM  
Hold Temp  
Day  
System  
Fan  
DaT  
y
i ml ig  
e
ht  
Auto  
Time  
S
et Program  
Return  
Copy  
Run  
Set Current  
Wake  
Leave  
Sleep  
Fan  
Mon  
Cool  
Fan  
Program  
Day/Time  
Wake  
System  
Heat  
M10318  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
M10322  
3
. Press Time ▲ or Time ▲ until the desired Wake time is  
displayed.  
7
. Press Leave, Return or Sleep and repeat steps 3, 4, 5  
and 5 for programming the rest of the day. The first day  
is now programmed.  
NOTE: The program times are in fifteen minute  
intervals. (Example: 8:00, 8:15, 8:30).  
Time  
IMPORTANT  
Repeat steps 1 through 7 for each day of the week  
Set Program Start Time  
Setting  
AM  
that has a different program than the first day. Refer  
to Copying a Day section to copy any program day to  
another.  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
Heat  
Wake  
System  
Heat  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
Fan  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
M10319  
8
. Press Run Program when all days are programmed.  
4
. Press increase ▲ or decrease ▲ key until the desired  
Wake temperature is displayed.  
AM  
Room  
Time  
Set Program  
Leave  
Return  
NOTE: The setpoint temperature range is 40 to 90°F  
Run  
Program  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Wake  
System  
Heat  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DST  
Fan  
(7 to 31°C) for heating and 45 to 99°F (9 to  
Auto  
DaT  
y
i ml ig  
e
ht  
Copy  
37°C) for cooling.  
M10323  
Set Program Start Time  
Setting  
Copying a Day  
AM  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
Heat  
Wake  
System  
Heat  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
Fan  
NOTE: The thermostat must be in the program mode to use  
the copy feature. Go to step 2 if the thermostat is  
already in the program mode.  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
M10320  
NOTE: Press Fan to modify fan operation. Auto means  
the fan will run only when the heating or  
1. Press Wake.  
cooling equipment is operating. On means the  
fan will run continuously for the entire period.  
Set Program Start Time  
Setting  
AM  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Wake  
System  
Heat  
Heat  
5
. Press Heat/Cool Settings to switch to other system  
temperature setpoint.  
Wake  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
Fan  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
M10324  
NOTE: The program times are the same for both  
heating and cooling.  
2
. Press Day to select the day to be copied if different  
from the day displayed.  
Set Program Start Time  
Setting  
Set Program Start Time  
Setting  
AM  
AM  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
Heat  
Heat/Cool  
Settings  
ProR  
u
n
S
De at yC / uT ri mr e en t  
Time  
Wake  
Set Program  
Leave  
Return  
Sleep  
Fan  
Day  
Settings  
Heat/Cool  
Wake  
System  
Heat  
g
r
am  
Mon  
Cool  
Fan  
Hold Temp  
Day  
System  
Fan  
Wake  
System  
Heat  
Auto  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
Time  
Daylight  
Copy  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
M10325  
M10321  
1
3
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
3. Press Copy.  
4. Repeat steps 2 and 3 for all the periods to be cleared.  
. Press Run Program.  
5
Copy  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
Setting Temporary Temperatures  
DaT  
y
i ml ig  
e
ht  
Copy  
M10326  
Changing Temperature Setting Until the Next  
Program Period  
4
. Press Day until the day to be copied to is displayed.  
Press increase ▲ or decrease ▲ key until the desired  
temperature setpoint is displayed.  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
Wed  
Day  
Settings  
Heat/Cool  
Hold Temp  
Day  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
NOTE: If ▲ or ▲ appear under the temperature display, it  
means that both the heating and cooling setpoints  
are being adjusted. Tapping the key will change both  
the heat and cool setpoints by one degree. Press i  
after the desired setpoint is reached to check the  
setpoints.  
M10327  
5
. Press Copy.  
NOTE: donE will be displayed for two seconds and  
then the normal program display will be  
shown.  
Temporary Setting  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Heat  
Copy  
Time  
Set Program  
Leave  
Return  
Wake  
ProR  
g
u
r
n
am  
S De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
DaT  
y
i ml ig  
e
ht  
Copy  
M10332  
M10328  
6
. Repeat steps 2 through 5 for all the days desired.  
. Press Run Program.  
NOTE: The temporary temperature setting is displayed for  
approximately 3 seconds. The setting is canceled  
when the next period starts or when Run Program is  
pressed.  
7
Clearing Program Period  
Changing Temperature Setting Indefinitely  
NOTE: The thermostat must be in the program mode to use  
the clear feature. Go to step 2 if the thermostat is  
already in the program mode.  
1. Press Hold Temp.  
Setting  
Time  
Set Program  
Leave  
Return  
PoR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Heat  
1. Press Wake, Leave, Return or Sleep.  
Hold Temp  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
Set Program Start Time  
Setting  
M10333  
AM  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Mon  
Heat  
Leave  
Leave  
System  
Heat  
2. Press increase ▲ or decrease ▲ key to change the  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
Fan  
DaT  
y
i ml ig  
e
ht  
Copy  
Auto  
setting, if desired.  
M10329  
Setting  
2. Press Day until the desired day is displayed.  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Heat  
Set Program Start Time  
Setting  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
AM  
DaT  
y
i ml ig  
e
ht  
Copy  
Time  
Set Program  
Leave  
Return  
M10334  
ProR  
g
u
r
n
am  
S De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Sat  
Heat  
Day  
Leave  
System  
Heat  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
Fan  
DaT  
y
i ml ig  
e
ht  
Auto  
Copy  
3
. Press Heat/Cool Settings to change between heat and  
cool settings.  
M10330  
3
. Press Leave, Return or Sleep until the start time and  
temperature setting are cleared (approximately 3  
seconds).  
Setting  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Cool  
Heat/Cool  
Settings  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
DaT  
y
i ml ig  
e
ht  
Copy  
NOTE: Wake cannot be cleared.  
M10335  
Set Program Start Time  
Setting  
4. Press increase ▲ or decrease ▲ key to adjust  
temperature settings.  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Sat  
Heat  
Leave  
Leave  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
Setting  
M10331  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Cool  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
M10336  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
NOTE: The display changes from the setpoint to the  
room temperature after approximately 3  
seconds.  
NOTE: In this example, the thermostat uses the Hold setting  
for eighteen days and returns to the daily programs  
at the Return period start time. The temperature  
settings are heating 54°F and cooling 84°F. Only the  
heating temperature is used because the System is  
set for Heat. The thermostat will use both the heating  
and cooling temperature settings when the System  
is set to Auto (select models).  
5
. Press Run Program to cancel the Hold and to return to  
the program.  
Changing Temperature Setting Until a  
Designated Day and Period  
IMPORTANT  
If the Hold needs to be canceled before the  
designated time, press Run Program to return to the  
program.  
1
. Press Hold Temp twice.  
Setting  
Hold for  
Wake  
Setting System and Fan  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Heat  
Hold Temp  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
The system default setting is Heat and the fan default setting  
is Auto. Use the System and Fan keys to change the settings.  
See Fig. 12. The fan settings can be set for each program  
period individually. The system selection is for all the program  
periods.  
DaT  
y
i ml ig  
e
ht  
Copy  
M10337  
2
. Press Time ▲ or Time ▲ until the desired number of  
days is displayed (1 to 255 days). (Example: 18 = Hold  
will override the daily programs for 18 days)  
System settings control the thermostat operation as follows:  
Heat: The thermostat controls the heating.  
Off: Both the heating and cooling are off.  
Cool: The thermostat controls the cooling.  
Auto: The thermostat automatically changes between  
heating and cooling operation, depending on the indoor  
temperature.  
Time  
Setting  
Hold for  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
ram  
n
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Heat  
Wake  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
M10338  
3
. Press Wake, Leave, Return or Sleep to select the  
period the program will start. (Example: Return =  
thermostat will stop the Hold at the Return period start  
time)  
Fan settings control the system fan as follows:  
On: Fan operates continuously.  
Auto: Fan operates with equipment.  
Setting  
Hold for  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Heat  
Return  
Return  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
M10339  
Time  
Set Program  
Leave  
Run  
Program  
Set Current  
Day/Time  
Wake  
Sleep  
Fan  
Return  
4
. Press increase ▲ or decrease ▲ key to adjust the  
temperature setting, if desired. (Example: Heat 54° =  
heating equipment will operate when the room  
temperature is below 54°F)  
System  
Fan  
Hold Temp  
Day  
H Se ea t tt /i Cn go so l  
System  
Daylight  
Time  
Copy  
Setting  
Hold for  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Heat  
Return  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
DaT  
y
i ml ig  
e
ht  
Copy  
M15042  
M10340  
Fig. 12.Thermostat System and Fan key locations.  
NOTE: When the System is set for Auto (select  
models), both heat and cool settings are  
needed. If the System is set for Heat, only the  
Heat setpoint is needed or if Cool is selected,  
only the Cool setpoint is needed.  
Setting Temporary Fan Operation  
If your thermostat has a Fan key and this feature, press Fan  
until the desired fan operation is selected. This fan setting will  
be in effect until the next regularly scheduled period starts.  
5
. Press Heat/Cool Settings to change between heat and  
cool settings.  
6
. Press increase ▲ or decrease ▲ key to adjust the  
temperature setting, if desired. (Example: Cool 84° =  
cooling equipment will operate when the room  
temperature is above 84°F)  
1
5
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
THERMOSTAT  
COOL SETPOINT  
Using Daylight Savings Time Feature  
This feature allows you to change in and out of Daylight  
PROPORTIONAL COOL  
Savings Time with a key press. When the Daylight Time Key is  
pressed in the fall, the time will go back one hour. In the  
spring, the time will go ahead one hour and the display will  
show DST. See Setting the Current Day and Time section for  
initial setting instructions.  
CONTROL POINT  
P+I CONTROL  
POINT  
P+I CONTROL POINT  
NOTE: Pressing the Daylight Time Key more than once  
within a five minute period will scroll you through  
various time options (Example: one hour earlier or  
later with or without DST). Pressing the Daylight  
Time Key six times in a five minute period will return  
you to your original settings.  
PROPORTIONAL HEAT  
CONTROL POINT  
THERMOSTAT  
HEAT SETPOINT  
HEATING  
COOLING  
50  
100  
50  
0
100  
PERCENT LOAD  
M4414  
AM  
Room  
Time  
Set Program  
Leave  
Return  
Fig 13. Proportional temperature control versus P+I  
temperature control.  
Daylight  
Time  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Tue  
Wake  
System  
Heat  
Hold Temp  
Day  
H
S
eat tt /i Cn go so l  
e
System  
Fan  
DaT  
y
i ml ig  
e
ht  
Auto  
Copy  
M10341  
Operation Sequence  
Displaying the Outdoor Temperature  
The thermostat energizes specific terminals depending what  
the Fan and System are set to. The LCD will display the time,  
room temperature, system and fan selection. Symbols will be  
displayed when the heating, cooling or fan is energized. See  
Table 10 for specific information.  
If your thermostat is equipped with an outdoor sensor, you  
can check the temperature at the sensor by pressing i  
once.  
Time  
Set Program  
Leave  
Return  
ProR  
g
u
r
n
am  
S
De at yC / uT ri mr e en t  
Wake  
Sleep  
Fan  
Outdoor  
Hold Temp  
Day  
H
S
e
e
at tt /i Cn go so l  
System  
NOTE: Not all the thermostat models have all the terminals  
listed in the Energize column.  
DaT  
y
i ml ig  
e
ht  
Copy  
M10342  
Table 10. Conventional System Sequence of Operation.  
Selection  
OPERATION  
Fan  
System  
Call  
None  
None  
Energize  
None  
Display  
None  
P+I Control  
The thermostat microprocessor based control requires that  
the user understands temperature control and thermostat  
performance. A conventional electromechanical or electronic  
thermostat does not control temperature precisely at setpoint.  
Typically, there is an offset (droop) in the control point as the  
system load changes. This is a phenomenon that most people  
in the industry know and accept. Many factors contribute to  
offset including switch differential, thermal lag, overshoot,  
cycle rates and system load.  
Auto Off  
On  
Off  
G
Auto Cool  
None  
O
None  
Auto Cool or Auto  
Cooling O, G and Y  
and  
Auto Heat  
None  
B
None  
The thermostat microprocessor simultaneously gathers,  
compares and computes data. Using this data, it controls a  
wide variety of functions. The special proprietary algorithm  
a
Auto Heat or Auto  
Heating B and W  
b
Auto Auto  
a
None  
O or B  
None  
(
program) in the thermostat eliminates the factors causing  
offset. This makes temperature control more accurate than  
the conventional electromechanical or electronic thermostats.  
The temperature control algorithm is called proportional plus  
integral (P+I) control.  
When electric heat fan is selected, G is energized and fan  
symbol is displayed.  
Based on last piece of equipment called (cooling = O or  
heating = B) and Installer Setup selection.  
b
The thermostat sensor, located on the thermostat or remote,  
senses the current space temperature. The proportional error  
is calculated by comparing the sensed temperature to the  
programmed setpoint. The deviation from the setpoint is the  
proportional error.  
Equipment Protection  
As part of the operational sequence, the thermostat  
microprocessor also incorporates minimum off time for all  
cooling stages. Using the minimum off time assures that rapid  
cycling of equipment does not occur, which extends  
equipment life. Minimum off times are set in the Installer  
Setup.  
The thermostat also determines integral error, which is a  
deviation based on the length of error time. The sum of the  
two errors is the (P+I) error. The cycle rate used to reach and  
maintain the setpoint temperature is computed using the P+I.  
The addition of the integral error is what differentiates the  
thermostat from many other electronic and electromechanical  
thermostats. See Fig. 13.  
68-0164—1  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Adaptive Intelligent Recovery® calculates the recovery ramp  
based on the number of degrees away from the desired  
setpoint, previous equipment performance, and weather  
history to initiate recovery at the optimal time to achieve the  
comfort setting at the desired time.  
Thermostat Operation  
Startup  
When power to the thermostat is turned on, a startup and  
initialization program begins. The startup occurs only on initial  
powerup. After total loss of power for an extended period, the  
current time and day may need to be set, but the user  
program is held. See Table 11 for the default values.  
Once the recovery ramp is intersected, the setpoint changes  
from the setback setpoint to the comfort setpoint. This change  
snaps on the equipment and runs the equipment until the  
setpoint is reached. If the setpoint is reached too early or too  
late, the ramp is adjusted for the next days' recovery.  
NOTE: Immediately following initialization, the user can  
enter new setpoints to be used in place of the default  
values.  
Table 11. Default Time, Setpoint and Fan Settings.  
70°F  
Heat  
Setpoint  
Cool  
Setpoint  
Fan  
Setting  
Period  
Time  
SETPOINT  
TEMPERATURE  
Wake  
6:00 AM  
70°F  
78°F  
(25.5°C)  
Auto  
Auto  
Auto  
Auto  
ACTUAL  
TEMPERATURE  
(21°C)  
60°F  
Leave  
Return  
Sleep  
8:00 AM  
6:00 PM  
10:00 PM  
62°F  
16.5°C)  
70°F  
85°F  
(29.5°C)  
SLEEP  
WAKE  
M6185A  
(
78°F  
(25.5°C)  
HEATING MODE  
(21°C)  
Fig. 14.Temperature change in recovery.  
62°F  
82°F  
(16.5°C)  
(28°C)  
®
Adaptive Intelligent Recovery Feature  
TROUBLESHOOTING GUIDE  
Adaptive Intelligent Recovery® ensures that the comfort  
setting is achieved at the programmed time regardless of  
weather conditions. Conventional recovery, however, starts  
recovery at the beginning of the programmed time period and  
uses the equipment to achieve the comfort settings as soon  
as possible.  
Refer to Table 12 for troubleshooting information.  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 12.Troubleshooting Information.  
Symptom  
Possible Cause  
Action  
Display will not  
come on.  
Thermostat is not being  
powered.  
•
Check for 24 Vac between R and C or W terminals.  
—
If missing 24 Vac:  
—
check if the circuit breaker is tripped—reset the circuit  
breaker.  
—
—
check if the system fuse is blown—replace the fuse.  
check if the power switch on the HVAC equipment is in the  
Off position—set to the On position.  
—
check wiring between thermostat and HVAC equipment—  
replace any broken wires and tighten any loose connections.  
—
If 24 Vac is present, proceed with troubleshooting.  
Temperature  
display is incorrect. been reconfigured.  
Room temperature display has Enter Installer Setup number 37 and reconfigure the display.  
Thermostat is configured for °F Enter Installer Setup number 14 and reconfigure the display.  
or °C display.  
Bad thermostat location.  
Relocate the thermostat.  
Temperature  
The upper or lower temperature Check the temperature setpoints:  
settings will not  
change. (Example:  
Cannot set the  
limits were reached.  
•
•
Heating limits are 40 to 90°F (4.5 to 32°C)  
Cooling limits are 45 to 99°F (7 to 35°C) except D model cooling  
limits are 48 to 99°F.  
heating higher or  
the cooling lower.) stops were configured.  
The setpoint temperature range  
Check Installer Setup numbers 34 and 35 and reconfigure the setpoint  
stops.  
Heating will not  
come on.  
No power to the thermostat.  
•
•
Setpoint is above room temperature.  
Check for 24 Vac between R and C or W terminals.  
—
If missing 24 Vac:  
—
check if the circuit breaker is tripped—reset the circuit  
breaker.  
—
—
check if the system fuse is blown—replace the fuse.  
check if the power switch on the HVAC equipment is in the  
Off position—set to the On position.  
—
check wiring between thermostat and HVAC equipment—  
replace any broken wires and tighten any loose connections.  
—
If 24 Vac is present, proceed with troubleshooting.  
Heating will not  
come on.  
Thermostat minimum off time is Wait up to five minutes for the system to respond.  
activated.  
System selection is not set to  
Heat.  
Set system selection to Heat.  
Heating setpoint is below room Check heating setpoint. Set heating setpoint to desired temperature.  
temperature.  
Cooling will not  
come on.  
No power to the thermostat.  
•
•
Setpoint is below room temperature.  
Check for 24 Vac between R or RC and C or Y terminals (D models  
requires power to R at all times).  
—
If missing 24 Vac:  
—
check if the circuit breaker is tripped—reset the circuit  
breaker.  
—
—
check if the system fuse is blown—replace the fuse.  
check if the power switch on the HVAC equipment is in the  
Off position—set to the On position.  
—
check wiring between thermostat and HVAC equipment—  
replace any broken wires and tighten any loose connections.  
—
If 24 Vac is present, proceed with troubleshooting.  
Thermostat minimum off time is • Wait up to five minutes for the system to respond.  
activated.  
•
Enter Installer Setup number 33. Reconfigure minimum off time (if  
required).  
System selection is not set to  
Cool.  
Set system selection to Cool.  
Cool setpoint is above room  
temperature.  
Check cooling setpoint. Set cooling setpoint to desired temperature.  
(continued)  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 12. Troubleshooting Information (continued).  
Symptom  
Possible Cause  
Action  
Heating or cooling Heat or cool circuit is opening  
Add resistor in parallel with load or install interface relay.  
come on  
momentarily and  
shut off  
up or becoming high  
impedance.  
Fan operation set for 0  
Enter Installer Setup number 2 and reconfigure the fan operation.  
System on indicator  
(
conventional heat) when it  
(
flame=heat,  
should be set for 1 (electric  
heat).  
snowflake=cool) is  
displayed, but no  
warm or cool air is  
coming from the  
registers.  
Conventional heating  
Wait a minute after seeing the on indicator and then check the registers.  
equipment turns on the fan  
when the furnace has  
warmed up to a setpoint.  
Heating or cooling equipment is Verify operation of heating or cooling equipment in self-test.  
not operating.  
Outdoor  
temperature not  
displayed  
Option not activated.  
Enter Installer Setup number 24 and set to 1. Thermostat must have OT  
terminals and a C7089B1000 installed.  
a
Outdoor sensor is connected  
incorrectly.  
Refer to C7089B1000 installation instructions and check wiring between  
the thermostat and sensor.  
Outdoor  
temperature  
display is incorrect  
a
Wrong sensor.  
Replace sensor with C7089B1000 sensor.  
a
Available on select models.  
CROSS REFERENCE  
All SUPER TRADELINE® Chronotherm® IV thermostats are  
different from the existing Chronotherm® III devices as  
summarized in Table 13.  
Refer to Table 14 for thermostat cross referencing information.  
Table 13. Differences Between Chronotherm® III Thermostats and Chronotherm® IV Thermostats.  
Feature/Function  
Programming  
Chronotherm® III Family  
5-1-1 day programming  
Chronotherm® IV Family  
7-day programming  
Changeover  
Automatic or manual changeover models  
available  
Automatic/manual changeover selectable  
Installer configuration  
Field settings made via screws on the back of  
the thermostat  
Field settings made through the keyboard  
System switching  
Fan switching  
Device color  
Mechanical switch  
Keyboard entry  
Mechanical switch  
Keyboard entry  
Beige or Premier White® color  
Taupe or Premier White® color  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 14.Thermostat Cross Reference Information.  
TRADELINE®  
Model Number  
T8600A  
Description  
Replacement  
Remarks  
One-stage heat conventional thermostat; system powered; system switch—none;  
fan switch—none.  
T8600A1000  
T8600A1018  
Honeywell logo.  
T8600D2028  
Heat/cool model can be used for heat  
only; system selection Heat-Off-Cool-  
Auto; duel fuel.  
Canadian TRADELINE® thermostat;  
Honeywell logo; degree C.  
T8600D2028  
Heat/cool model can be used for heat  
only; system selection Heat-Off-Cool-  
Auto; configure for °C in Installer Setup  
14; duel fuel.  
T8600A1034  
Canadian TRADELINE® thermostat;  
Honeywell logo; Premier White® color;  
degree C.  
T8600D2028  
Heat/cool model can be used for heat  
only; system selection Heat-Off-Cool-  
Auto; configure for °C in Installer Setup  
14; duel fuel.  
T8600B  
One-stage heat and one-stage cool conventional thermostat; system powered  
T8600B1008  
TRADELINE® thermostat; Honeywell logo;  
system switch—HEAT-OFF; fan  
switch—none.  
T8600D2028  
T8600D2028  
Heat/cool model can be used for heat  
only; system selection Heat-Off-Cool-  
Auto; fan selection On-Auto; duel fuel;  
no positive off.  
T8600B1016  
TRADELINE® thermostat; Honeywell logo;  
system switch—none; fan  
switch—ON-AUTO.  
Heat/cool model can be used for heat  
only; system selection Heat-Off-Cool-  
Auto; duel fuel.  
T8600C  
One-stage heat and one-stage cool thermostat; system powered; system switch—HEAT-OFF-  
COOL; fan switch—ON-AUTO  
T8600C1014  
T8600C1030  
TRADELINE® thermostat; Honeywell logo;  
conventional.  
T8600D2028  
Separate O & B terminals; duel fuel.  
Canadian TRADELINE® thermostat;  
Honeywell logo; conventional; degree C;  
O and B terminals.  
T8600D2028  
Configure for °C in Installer Setup 14;  
duel fuel; jumper R to Rc.  
T8600C1048  
T8600C1055  
T8600C1063  
T8600C1071  
York logo; conventional; part no.  
T8600D2028  
T8600D2028  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel.  
2ET07700124A.  
Canadian TRADELINE® thermostat;  
Honeywell logo; conventional; degree C.  
Configure for °C in Installer Setup 14;  
duel fuel; jumper R to Rc.  
Trane logo; conventional; part no.  
THT0594.  
Separate O & B terminals; duel fuel.  
Trane logo; electric heat; O and B  
terminals; part no. THT0595.  
Configure for electric heat in Installer  
Setup 2; jumper R to Rc.  
T8600C1089  
T8600C1097  
Texfan logo; conventional.  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel.  
Separate O & B terminals; duel fuel.  
Glowcore logo; conventional; part no.  
THC-3.  
T8600C1105  
T8600C1113  
T8600C1121  
T8600C1147  
T8600C1154  
T8600C1162  
York logo; conventional; part no. 025-27653 T8600D2028  
and 2ET0770224A.  
Separate O & B terminals.  
Canadian York thermostat; conventional;  
T8600D2028  
T8600D2028  
T8600D2028  
T8600D2028  
T8600D2028  
Separate O & B terminals; configure for  
°C in Installer Setup 14; duel fuel.  
degree C.  
Arcoaire logo; conventional: part no.  
Separate O & B terminals; duel fuel.  
1506-745.  
Trane logo; conventional; part no.  
TAYSTAT300.  
Separate O & B terminals; duel fuel;  
jumper R to Rc.  
American Standard logo; conventional;  
part no. ASYSTAT600.  
Separate O & B terminals; duel fuel;  
jumper R to Rc.  
SUPER TRADELINE® thermostat;  
Honeywell logo; duel fuel fan control; O and  
B terminals.  
Jumper R to Rc.  
(continued)  
68-0164—1  
20  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 14. Thermostat Cross Reference Information. (continued)  
TRADELINE®  
Replacement  
Model Number  
Description  
Remarks  
T8600C1170  
Carrier thermostat; conventional; part no.  
HH07AX006.  
T8600D2028  
Separate O & B terminals; duel fuel;  
jumper R to Rc.  
T8600C1188  
T8600C1196  
Carrier thermostat; conventional; part no.  
HH641-101.  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel;  
jumper R to Rc.  
Canadian TRADELINE® thermostat;  
Honeywell logo; Premier White® color;  
conventional; degree C.  
Separate O & B terminals; configure for  
°C in Installer Setup 14; duel fuel;  
jumper R to Rc.  
T8600C1204  
T8600C1212  
Canadian Lennox thermostat; conventional; T8600D2028  
degree C.  
Separate O & B terminals; configure for  
°C in Installer Setup 14; duel fuel;  
jumper R to Rc.  
SUPER TRADELINE® thermostat;  
Honeywell logo; duel fuel fan control; O and  
B terminals.  
T8600D2028  
Jumper R to Rc; taupe color.  
T8600C1220  
T8600C1238  
Servel logo; Premier White® color;  
conventional; Robur part no. 15471-82.  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel;  
taupe color.  
ICP logo; Premier White® color; duel fuel  
fan control; O and B terminals; part no.  
HQ1149371HW.  
Jumper R to Rc; taupe color.  
T8600C1246  
T8600C1253  
ICP logo; Premier White® color; duel fuel  
fan control; O and B terminals; part no.  
HQ1149372HW.  
T8600D2028  
T8600D2028  
T8600D2028  
Jumper R to Rc; taupe color.  
Consolidated Industries logo; Premier  
White® color; conventional; part no.  
Separate O & B terminals; duel fuel;  
taupe color.  
412360.  
T8600C1279  
Canadian TRADELINE® (French)  
thermostat; conventional.  
English only keyboard; separate O & B  
terminals; duel fuel.  
T8600D  
One-stage heat and one-stage cool conventional thermostat; system powered; automatic  
changeover; system switch— HEAT-OFF-COOL-AUTO; fan switch— ON-AUTO  
T8600D1004  
T8600D1012  
TRADELINE® thermostat; Honeywell logo.  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel.  
Canadian TRADELINE® thermostat;  
Honeywell logo; degree C.  
Separate O & B terminals; configure for  
°C in Installer Setup 14; duel fuel.  
T8600D1020  
T8600D1038  
Energy Sensor.  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel.  
Canadian Carrier thermostat; degree C;  
part no. HH07AT101.  
Separate O & B terminals; configure for  
°C in Installer Setup 14; duel fuel;  
T8600D1046  
T8600D1053  
Trane.  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel.  
Separate O & B terminals; duel fuel.  
Heil Quaker thermostat; Honeywell logo;  
part no. HQ1000776HW.  
T8600D1061  
T8600D1079  
T8600D1103  
T8600D1111  
Carrier.  
T8600D2028  
T8600D2028  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel.  
Separate O & B terminals; duel fuel.  
Separate O & B terminals; duel fuel.  
Lennox logo; part no. 27H3101.  
Carrier.  
TRADELINE® thermostat; Honeywell logo;  
Premier White® color.  
Separate O & B terminals; duel fuel;  
taupe color.  
T8600D1129  
Canadian TRADELINE® thermostat;  
Honeywell logo; Premier White® color;  
degree C.  
T8600D2028  
Separate O & B terminals; configure for  
°C in Installer Setup 14; duel fuel.  
T8600D1137  
T8600D1145  
Solitaire logo; Premier White® color;  
Nordyne part no. 9132400.  
T8600D2028  
T8600D2028  
Separate O & B terminals; duel fuel;  
taupe color.  
Canadian Carrier thermostat; Premier  
White® color; degree C; part no.  
HH07AT101-W.  
Separate O & B terminals; configure for  
°C in Installer Setup 14; duel fuel.  
(continued)  
2
1
68-0164—1  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 14. Thermostat Cross Reference Information. (continued)  
TRADELINE®  
Model Number  
T8601A  
Description Remarks  
Replacement  
One-stage conventional heat thermostat; powered direct from 24 Vac transformer  
T8601A1017  
Canadian TRADELINE® thermostat;  
Honeywell logo; system switch—none;  
fan switch—none; degree C.  
T8601D2019  
Heat/cool model can be used for heat  
only; system selection Heat-Off-Cool-  
Auto; configure for °C in Installer Setup  
14; Premier White® color.  
T8601B  
One-stage conventional heat with fan thermostat; powered direct from 24 Vac transformer  
T8601B1007  
TRADELINE® thermostat; Honeywell logo;  
system switch—none; fan  
switch—ON-AUTO .  
T8601D2019  
Heat/cool model can be used for heat  
only; system selection Heat-Off-Cool-  
Auto; jumper R to Rc for fan control;  
Premier White® color.  
T8601C  
One-stage heat and one-stage cool conventional thermostat; powered direct from 24 Vac  
transformer; system switch—HEAT-OFF-COOL; fan switch—ON-AUTO; O and B terminals  
T8601C1003  
T8601C1013  
TRADELINE® thermostat; Honeywell logo.  
T8601D2019  
T8601D2019  
Jumper R to Rc; Premier White® color.  
Canadian TRADELINE® thermostat;  
Honeywell logo; degree C.  
Configure for °C in Installer Setup 14;  
jumper R to Rc; Premier White® color.  
T8601C1021  
T8601C1039  
T8601C1047  
New Construction thermostat.  
T8601D2019  
T8601D2019  
T8601D2019  
Jumper R to Rc; Premier White® color.  
Jumper R to Rc; Premier White® color.  
Jumper R to Rc.  
Carrier logo; part no. HH641-104.  
New Construction thermostat; Premier  
White® color.  
a
T8601C1054  
T8601C1062  
T8601D  
Trol-A-Temp® thermostat; Premier White®  
color.  
T8601D2027  
T8601D2027  
Configure manual changeover in  
Installer Setup12; replacement has Oc  
terminals.  
a
Trol-A-Temp® by Honeywell logo.  
Configure manual changeover in  
Installer Setup12; replacement has Oc  
terminals; Premier White® color.  
One-stage heat and one-stage cool conventional thermostat; powered direct from 24 Vac  
transformer; automatic changeover; system switch—HEAT-OFF-COOL-AUTO; fan switch—ON-  
AUTO  
T8601D1011  
Canadian TRADELINE® thermostat;  
Honeywell logo; degree C.  
T8601D2019  
Separate O & B terminals; configure for  
°C in Installer Setup 14 and  
changeover in 12; jumper R to Rc;  
Premier White® color.  
T8601D1029  
New Construction thermostat.  
T8601D2019  
Separate O & B terminals; configure  
changeover in Installer Setup 12;  
jumper R to Rc; Premier White® color.  
a
T8601D1045  
T8601D1052  
Trol-A-Temp® by Honeywell thermostat;  
Premier White® color.  
T8601D2027  
Separate O & B terminals; replacement  
has Oc terminals.  
New Construction thermostat; Premier  
White® color.  
T8601D2019  
Separate O & B terminals; configure  
changeover in Installer Setup 12;  
jumper R to Rc.  
T8601D1060  
T8601D1078  
California Economizer logo; Premier  
White® color.  
T8601D2019  
T8601D2019  
Separate O & B terminals; configure  
changeover in Installer Setup 12;  
jumper R to Rc.  
Amana logo; Premier White® color;  
part no. P1213701F.  
Separate O & B terminals; configure  
changeover in Installer Setup 12;  
jumper R to Rc.  
(continued)  
68-0164—1  
22  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 14. Thermostat Cross Reference Information. (continued)  
TRADELINE®  
Replacement  
Model Number  
T8602A  
Description  
Remarks  
One-stage heat conventional thermostat; battery powered; system switch—none; fan switch—  
none  
T8602A1008  
TRADELINE® thermostat; Honeywell logo.  
T8602D2000  
Heat/cool model can be used for heat  
only; separate O & B terminals; system  
selection Heat-Off-Cool-Auto; fan  
selection Auto-On.  
T8602B  
One-stage heat conventional with fan thermostat; battery powered; system switch—none; fan  
switch—ON-AUTO  
T8602B1006  
TRADELINE® thermostat; Honeywell logo.  
T8602D2000  
Heat/cool model can be used for heat  
only; separate O & B terminals; system  
selection Heat-Off-Cool-Auto; fan  
selection Auto-On; jumper R to Rc for  
fan operation.  
T8602B1014  
TRADELINE® thermostat; Honeywell logo;  
Premier White® color.  
T8602D2000  
Heat/cool model can be used for heat  
only; separate O & B terminals; system  
selection Heat-Off-Cool-Auto; fan  
selection Auto-On; jumper R to Rc for  
fan operation; taupe color.  
T8602C  
One-stage heat and one-stage cool thermostat; battery powered; system switch—HEAT-OFF-  
COOL; fan switch—ON-AUTO  
T8602C1004  
T8602C1012  
T8602C1020  
T8602C1046  
TRADELINE® thermostat; Honeywell logo.  
Amana logo; conventional; part no.: none.  
Rheem logo; conventional; part no.: none.  
T8602D2000  
T8602D2000  
T8602D2000  
T8602D2000  
Separate O & B terminals; jumper R to  
Rc.  
Separate O & B terminals; jumper R to  
Rc.  
Separate O & B terminals; jumper R to  
Rc.  
SUPER TRADELINE® thermostat;  
Honeywell logo; duel fuel fan control; O and  
B terminals.  
a
T8602C1061  
Trol-A-Temp® by Honeywell thermostat;  
Premier White® color; conventional; O and  
B terminals.  
T8602C2051  
a
T8602C1079  
T8602C1095  
Trol-A-Temp® by Honeywell thermostat;  
conventional; O and B terminals.  
T8602C2051  
T8602D2000  
Premier White® color.  
Taupe color.  
SUPER TRADELINE® thermostat;  
Honeywell logo; Premier White® color; duel  
fuel fan control; O and B terminals.  
T8602C1103  
Canadian TRADELINE® thermostat;  
Honeywell logo; duel fuel fan control;  
degree C; O and B terminals.  
T8602D2000  
Configure for °C in Installer Setup 14 .  
T8602C1129  
T8602C1137  
T8602C1145  
Universal Parts logo; Rheem part no.  
T8602D2000  
T8602D2000  
T8602D2000  
41-21615-05; conventional.  
ICP logo; duel fuel fan control; O and B  
terminals; part no. HQ1149373HW.  
ICP logo; Premier White® color; duel fuel  
fan control; O and B terminals;  
part no. HQ1149374HW.  
Taupe color.  
(continued)  
2
3
68-0164—1  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
Table 14. Thermostat Cross Reference Information. (continued)  
TRADELINE®  
Replacement  
Model Number  
T8602D  
Description  
Remarks  
One-stage heat and one-stage cool conventional thermostat; battery powered; automatic  
changeover  
a
T8602D1010  
Trol-A-Temp® by Honeywell thermostat;  
Premier White® color; system  
T8602D2026  
switch—none; fan switch—none; field  
terminals: W/4, R/5, Y/6.  
a
T8602D1028  
Trol-A-Temp® by Honeywell thermostat;  
system switch—none; fan switch—none;  
field terminals: W/4, R/5, Y/6.  
T8602D2026  
Premier White® color.  
CT8602C  
One-stage heat and one-stage cool retail thermostat battery powered  
CT8602C1001  
Retail Honeywell logo; off-white color; duel  
fuel fan control; system switch HEAT-OFF-  
COOL; fan switch ON-AUTO; separate O  
and B terminals; clamshell packaging.  
T8602D2000  
TRADELINE® packaging.  
a
Trol-A-Temp® by Honeywell thermostat model.  
WIRING DIAGRAMS (Fig. 15-20)  
THERMOSTAT  
THERMOSTAT  
Y
G
O
B
W
R
OT  
OT  
3
3
COMPRESSOR  
CONTACTOR  
COOL  
DAMPER  
HEAT  
RELAY  
2
G
W
R
OUTDOOR  
TEMPERATURE  
SENSOR  
2
FAN  
RELAY  
HEAT  
DAMPER  
HEAT  
RELAY  
2
1
FAN  
RELAY  
1
L1  
L1  
HOT)  
(
HOT)  
(
L2  
L2  
TRANSFORMER  
TRANSFORMER  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
NOT AVAILABLE ON T8600A MODELS.  
M10346  
2
3
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT  
PUMP SYSTEMS.  
Fig. 15.Typical hookup of T8600 or T8602  
in heat only application.  
AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A  
SEPARATE CABLE FROM THE THERMOSTAT CABLE.  
M10347  
Fig. 16.Typical hookup of T8600 or T8602 in heat and cool  
system with one transformer.  
68-0164—1  
24  
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®
T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
THERMOSTAT  
THERMOSTAT  
RC  
Y
G
O
B
W
R
OT  
OT  
C
Y
G
O
B
W
R
OT  
OT  
2
4
5
4
3
3
COMPRESSOR  
CONTACTOR  
COOL  
DAMPER  
HEAT  
RELAY  
COMPRESSOR  
CONTACTOR  
COOL  
DAMPER  
HEAT  
RELAY  
3
2
OUTDOOR  
OUTDOOR  
TEMPERATURE  
SENSOR  
TEMPERATURE  
SENSOR  
FAN  
RELAY  
HEAT  
DAMPER  
FAN  
RELAY  
HEAT  
DAMPER  
3
2
1
1
L1  
L1  
(HOT)  
L1  
HOT)  
(
HOT)  
(
L2  
L2  
L2  
1
HEATING  
TRANSFORMER  
TRANSFORMER  
COOLING  
TRANSFORMER  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
2
3
JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A  
ONE TRANSFORMER SYSTEM.  
2
3
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT  
PUMP SYSTEMS.  
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT  
PUMP SYSTEMS.  
AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A  
SEPARATE CABLE FROM THE THERMOSTAT CABLE.  
M10353  
4
AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A  
SEPARATE CABLE FROM THE THERMOSTAT CABLE.  
Fig. 19.Typical hookup of T8601 in heat  
and cool system with one transformer.  
5
T8600D MODELS REQUIRE POWER TO R TERMINAL AT ALL TIMES.  
M10348  
THERMOSTAT  
Fig. 17.Typical hookup of T8600 or T8602 in heat and  
cool system with two transformers.  
RC  
Y
G
O
4
C
B
W
R
5
OT  
OT  
2
4
THERMOSTAT  
COMPRESSOR  
CONTACTOR  
COOL  
DAMPER  
HEAT  
RELAY  
OUTDOOR  
TEMPERATURE  
SENSOR  
C
G
W
R
3
2
FAN  
RELAY  
HEAT  
DAMPER  
HEAT  
RELAY  
3
1
1
FAN  
RELAY  
L1  
L1  
L1  
(HOT)  
(HOT)  
(
HOT)  
L2  
L2  
1
L2  
HEATING  
TRANSFORMER  
COOLING  
TRANSFORMER  
TRANSFORMER  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
NOT AVAILABLE ON "A" MODELS.  
M10357  
2
3
JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A  
ONE TRANSFORMER SYSTEM.  
Fig. 18.Typical hookup of T8601 in heat only application.  
CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT  
PUMP SYSTEMS.  
4
5
AVAILABLE ON SELECT MODELS. OT WIRES MUST HAVE A  
SEPARATE CABLE FROM THE THERMOSTAT CABLE.  
T8601D MODELS REQUIRE POWER TO R TERMINAL AT ALL TIMES.  
M10354  
Fig. 20.Typical hookup of T8601 in heat  
and cool system with two transformers.  
2
5
68-0164—1  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
68-0164—1  
26  
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T8600D, T8601D AND T8602D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTATS  
2
7
68-0164—1  
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