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T8501  
Microelectronic Thermostats  
INSTALLATION INSTRUCTIONS  
APPLICATION  
The T8501 Microelectronic Thermostats provides electronic control of 24 Vac single-stage heating and cooling  
systems. Refer to Table 1 for a general description of the thermostat. All T8501 thermostats require a common wire to  
supply power.  
Table 1. Description of T8501 Thermostats.  
Fan  
System  
Changeover  
System Selection  
Selection  
Comments  
Heat-Cool  
Automatic  
Heat-Off-Cool-Auto  
On-Auto  
System and fan selections are done by  
keyboard.  
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.  
—
MERCURY NOTICE  
If this control is replacing a control that contains  
mercury in a sealed tube, do not place your old  
control in the trash. Dispose of properly.  
Contact your local waste management authority  
for instructions regarding recycling and the  
proper disposal of the old control.  
Wallplate Installation  
The thermostat can be mounted horizontally on the wall  
or on a 2 in. x 4 in. (50.8 mm x 101.6 mm) wiring box.  
Position wallplate horizontally on the wall or on a  
INSTALLATION  
2
in. x 4 in. (50.8 mm x 101.6 mm) wiring box.  
1
.
Position and level the wallplate (for appearance  
only). The thermostat will function properly even  
when not level.  
Use a pencil to mark the mounting holes.  
See Fig. 2.  
When Installing this Product...  
1
.
.
Read these instructions carefully. Failure to follow  
the instructions can damage the product or cause  
a hazardous condition.  
2
.
.
2
Check the ratings given in the instructions and on  
the product to make sure the product is suitable for  
your application.  
3
Remove the wallplate from the wall and drill two  
3
/16 inch (76 mm) holes in the wall (if drywall) as  
marked. For firmer material such as plaster, drill  
two 7/32 inch (5.56 mm) holes. Gently tap anchors  
3
.
.
Installer must be a trained, experienced service  
technician.  
After completing installation, use these instructions  
to check out the product operation.  
(provided) into the drilled holes until flush with the  
4
wall.  
4.  
Position the wallplate over the holes, pulling wires  
through the wiring opening.  
5
6
.
.
Loosely insert the mounting screws into the holes.  
Tighten mounting screws.  
Location  
Install the thermostat about 1.5m (5 ft) above the floor in  
an area with good air circulation at average temperature.  
See Fig. 1.  
®
U.S. Registered Trademark  
Copyright © 2004 Honeywell •  
• All Rights Reserved  
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T8501 MICROELECTRONIC THERMOSTATS  
NO  
YES  
NO  
5
FEET  
NO  
[
1.5 METERS]  
M10106  
Fig. 1. Typical location of thermostat.  
CAUTION  
WALL  
Electrical Shock Hazard.  
Can cause electrical shock and equipment  
damage.  
WIRES  
THROUGH WALL  
Disconnect power before wiring.  
1.  
Loosen the terminal screws on the wallplate and  
connect the system wires. See Fig. 6.  
IMPORTANT  
Use 18 gauge, color-coded thermostat cable for  
WALL  
ANCHORS  
(
2)  
proper wiring.  
2.  
3.  
4.  
Securely tighten each terminal screw.  
Push excess wire back into the hole.  
Plug the hole with nonflammable insulation to pre-  
vent drafts from affecting the thermostat.  
MOUNTING  
HOLES  
THERMOSTAT  
O
T
OT  
C
W
R
2
MOUNTING  
SCREWS  
OUTDOOR  
TEMPERATURE  
SENSOR  
HEATING  
RELAY OR  
VALVE COIL  
M6530A  
Fig. 2. Mounting the wallplate.  
1
L1  
(
HOT)  
WIRING  
L2  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
All wiring must comply with local electrical codes and  
ordinances. Refer to Fig. 3 and 5 for typical hookup. A  
letter code is located near each terminal for identification.  
AVAILABLE ON SELECT MODELS.  
M4822  
Fig. 3. Typical hookup in heat only application.  
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T8501 MICROELECTRONIC THERMOSTATS  
.
THERMOSTAT  
FOR WRAPAROUND  
INSERTION STRIP  
/16 IN. (11 MM).  
FOR STRAIGHT INSERTION  
STRIP 5/16 IN. (8 MM).  
7
OT  
OT  
C
B
O
G
Y
W
R
2
M4826  
OUTDOOR  
HEATING  
TEMPERATURE  
SENSOR  
RELAY OR  
VALVE COIL  
Fig. 6. Correct wiring technique.  
COMPRESSOR  
CONTACTOR  
Mounting Thermostat  
1.  
Engage tabs at the top of the thermostat and wall-  
plate. See Fig. 7.  
COOL  
CHANGEOVER  
VALVE OR  
DAMPER  
2.  
Press lower edge of case to close and latch.  
NOTE: To remove the thermostat from the wall, first pull  
out at the bottom of the thermostat; remove top  
last.  
HEAT  
CHANGEOVER  
VALVE OR  
DAMPER  
FAN  
RELAY  
1
L1  
(
HOT)  
L2  
A. ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
AVAILABLE ON SELECT MODELS.  
M4821  
Fig. 4. Typical hookup in heat and cool system with  
one transformer.  
THERMOSTAT  
3
B. PRESS LOWER EDGE OF CASE TO LATCH.  
OT  
OT  
Rc  
O
G
Y
C
B
W
Rh  
2
OUTDOOR  
TEMPERATURE  
SENSOR  
HEAT  
CHANGEOVER  
VALVE OR  
DAMPER  
COMPRESSOR  
CONTACTOR  
HEATING  
RELAY OR  
VALVE COIL  
M6798A  
FAN  
RELAY  
Fig. 7. Mounting thermostat on wallplate.  
COOL  
CHANGEOVER  
VALVE OR  
DAMPER  
1
L1  
(HOT)  
L2  
1
L1  
(
HOT)  
L2  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
2
3
AVAILABLE ON SELECT MODELS.  
JUMPER Rh TO Rc IN A SINGLE TRANSFORMER SYSTEM.  
M4820  
Fig. 5. Typical hookup in heat and cool system with  
two transformers.  
3
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T8501 MICROELECTRONIC THERMOSTATS  
Using Thermostat Keys  
The thermostat keys are used to:  
•
•
•
•
•
set the temperature,  
display present setting,  
configure Installer Setup,  
check System-Test,  
display outdoor temperature (select models),  
i
System  
Fan  
System  
Fan  
Press to select  
heating or cooling  
equipment.  
Press to select  
heating or cooling  
equipment.  
Em. Ht.-Emergency heating  
HeatÑ Heating equipment  
OnÑ Fan runs continuously  
AutoÑ Fan runs when  
heating or cooling  
Off  
Ñ No equipment  
System  
Fan  
CoolÑCooling equipment  
AutoÑ Thermostat  
automatically selects  
heating and cooling  
equipment.  
equipment operates  
Select models have keys to:  
•
•
set the system operation,  
set the fan operation.  
1
NOTE: Always press the keys with your fingertip or sim-  
ilar blunt tool. Sharp instruments like a pen or  
pencil point can damage the keyboard.  
1
LED INDICATOR.  
M10147C  
See Fig. 8 for key locations.  
Fig. 9. T8501 System and Fan key locations.  
INCREASE  
TEMPERATURE  
SETTING  
Temperature Settings  
The default setpoint for heat is 70°F (21°C) and for cool  
is 78°F (25.5°C). Press the increase ꢀ or decrease ꢁ  
key to change the present setting. To change between  
heat and cool, press the Information i key until the setting  
to be changed appears.  
DECREASE  
TEMPERATURE  
SETTING  
i
DISPLAY PRESENT  
SETTINGS AND SCROLL  
THROUGH INSTALLER  
SETUP (INFORMATION KEY)  
M6801A  
INSTALLER SETUP  
Fig. 8. Thermostat key locations and descriptions.  
NOTE: For most applications, the thermostat factory-  
settings do not need to be changed. Review the  
factory settings in Table 2 and if no changes are  
necessary, go to the Installer Self-Test section.  
SETTINGS  
The Installer Setup is used to customize the thermostat  
to specific systems. Some of the options include:  
System and Fan Settings  
System settings control the thermostat operation:  
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.  
—
—
—
temperature display,  
changeover and  
outdoor temperature display.  
Installer Setup numbers are listed in Table 3. The table  
includes all the configuration options and the factory-  
settings for the T8501.  
Fan settings control the system fan:  
On: Fan operates continuously.  
Auto: Fan operates with equipment.  
A combination of key presses are required to use the  
Installer Setup feature:  
—
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. 11 and 12.  
To advance to the next Installer Setup, press the  
i key.  
To change a setting, use the increase ꢀ or  
decrease ꢁ key.  
To exit the Installer Setup, press and hold the  
Information i key until the display returns to normal  
The system default setting is Heat and the fan default  
setting is Auto. Use the keyboard or System and Fan  
switches, depending on model, to change to the desired  
settings. See Fig. 9.  
—
—
—
(
approximately three seconds). The display scrolls the  
numbers backward to get to the normal display. The  
Installer Setup is automatically exited if no key  
presses are made for five minutes.  
NOTE: Only configurable number are shown.  
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T8501 MICROELECTRONIC THERMOSTATS  
CAUTION  
Heat pump and electric heat systems can be  
damaged when run without fan.  
Configure to 01 in Installer Setup number 02 to  
prevent equipment damage.  
Em Ht Temporary Setting  
Remote  
Room  
Equipment Damage Hazard.  
Aux Ht  
%
Humid  
Outdoor  
Heat Cool  
Repl  
Batt  
Wait  
System  
Fan  
IMPORTANT  
Em HeatOffCool Auto Only OnAuto  
Only configurable numbers are shown on the  
device. Example: If thermostat does not have a  
system key, Installer Setup Number 12 does not  
display. Review Table 3 factory-settings and  
mark any desired changes in the Actual Setting  
column. When Installer Setup is complete,  
review the settings to confirm that they match  
the system.  
M4844  
Fig. 10. Display of all LCD segments.  
.
INSTALLER SETUP  
NUMBER DISPLAY  
(
COLUMN 1 OF TABLE 2)  
FACTORY SETTING OR  
OTHER CHOICE DISPLAY  
(
COLUMN 3 OR 5 OF TABLE 2)  
M10105B  
Fig. 11. Display of Installer Setup  
number and setting.  
Table 2. Thermostat Installer Setup Options.  
Installer Setup  
Number(Press  
i key to  
Other Choices  
(Press ꢀ or ꢁ key to change)  
Factory Setting  
Select  
change)  
Display  
Description  
Display  
Description  
Not Used.  
01  
02  
—
0
—
—
—
Fan  
operationa  
Conventional  
01  
Heat pump or electric heat  
applications where thermostat  
controls fan operation in heat  
mode.  
applications where  
equipment controls  
fan operation in heat  
mode.  
Not Used.  
03  
04  
—
6
—
—
—
Heating cycle  
rate.  
6 cph used for  
conventional  
systems  
01, 03  
or 09  
01—1 cph used for radiant floor  
heat, gravity system  
03—3 cph used for hot water  
systems or high efficiency  
furnaces  
0
9—9 cph used for electric heat  
systems  
Not Used.  
05 thru 11  
12  
—
—
—
—
Changeover  
01  
Manual changeover  
00  
00—Auto changeover  
—
(T8501D  
only)  
Not used  
13  
—
—
—
5
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T8501 MICROELECTRONIC THERMOSTATS  
Table 2. Thermostat Installer Setup Options. (Continued)  
Installer Setup  
Number(Press  
i key to  
Other Choices  
(Press ꢀ or ꢁ key to change)  
Factory Setting  
Display Description  
Select  
Degree  
temperature  
display  
change)  
Display  
Description  
14  
00  
Temperature is  
displayed in °F  
01  
Temperature is displayed in °C  
Not Used.  
15 thru 18  
19  
—
—
—
—
Extended fan  
operation in  
heating.a,b  
00  
No extended fan  
operation after the  
call for heat ends.  
01  
Fan operation is extended 90  
seconds after the call for heat  
ends.  
Extended fan  
operation in  
cooling.a  
20  
00  
No extended fan  
operation after the  
call for cool ends.  
01  
Fan operation is extended 90  
seconds after the call for cool  
ends.  
Not Used.  
21 thru 23  
24  
—
—
—
—
Outdoor  
temperature  
displaya  
00  
No outdoor  
temperature is  
displayed.  
01  
Outdoor temperature is  
displayed. Needs a C7089B1000  
Outdoor Temperature Sensor to  
operate.  
Not Used.  
25 thru 32  
33  
—
—
—
—
Minimum off  
time for the  
compressor.  
05  
5 minutes minimum  
off time for the  
compressor.  
00, 01,  
02, 03  
or 04  
Minimum number of minutes (0  
thru 5) the compressor will be off  
between calls for the compressor.  
Temperature  
range stops  
in heating.  
34  
35  
36  
37  
90  
Heating setpoint can  
be set no higher  
than 90°F.  
40 to 90 Number can be set anywhere  
between 40 and 90 in 1°F  
increments.  
Temperature  
range stops  
in cooling.  
5c  
00  
00  
Lowest setpoint  
cooling can be set  
to.  
45 to 99 Number can be set anywhere  
between 45 and 99 in 1°F  
increments.  
4
System On  
display.a  
LCD On symbol is  
displayed when  
system is energized.  
01  
Display is disabled, usually set  
for 01 for a zoned system.  
Temperature  
display  
adjustment.  
No difference in  
displayed  
temperature and  
actual room  
+3 thru  
03  
01—Display adjusts to 1°F higher  
than actual room temperature.  
02—Display adjusts to 2°F higher  
than actual room temperature.  
03—Display adjusts to 3°F higher  
than actual room temperature.  
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.  
aAvailable on select models.  
bMode 02 must be set to 01 to extend fan operation.  
IMPORTANT  
Installer Setup changes and initiated a reset in  
order to operate using the new settings. Be sure  
to set the current day and time immediately.  
Review the settings to confirm that they match  
the system. Press Run Program to exit the  
Installer Setup. The thermostat has saved the  
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T8501 MICROELECTRONIC THERMOSTATS  
INSTALLER SYSTEM TEST  
Em Ht Temporary Setting  
Aux Ht  
Remote  
Room  
%Humid  
Use the Installer System Test to check the thermostat  
operation. Refer to Table 3 for a list of the available  
system tests.  
Outdoor  
Heat Cool  
Repl  
Batt  
Wait  
CAUTION  
System  
Fan  
Em HeatOffCool Auto Only OnAuto  
Equipment Damage Hazard.  
Minimum off time for compressor is bypassed  
during Installer System Test.  
M4844  
Prevent compressor from cycling too quickly.  
Fig. 12. Display of all LCD segments.  
To start the system test:  
Press and hold the increase ꢀ and decrease ꢁ keys at  
the same time until two zeros (00) appear. All segments  
of the LCD are displayed before 00 appears.  
See Fig. 11 and 12.  
Table 3. Tests Available In Installer System Test.  
Test  
Number  
System Test Description  
1
3
4
0-19  
0-39  
0-49  
Heating equipment can be turned on and  
off.  
TEST NUMBER  
M6792A  
Cooling equipment can be turned on and  
off.  
Fig. 13. Display of test number.  
Refer to Table 4 for the directions and results of the  
specific tests.  
Fan equipment can be turned on and off.  
Keyboard keys test.  
6
6
0 0 to  
0 19  
IMPORTANT  
Models with System and Fan switches must set  
the switches to the equipment that is being  
checked for the equipment to operate.  
70-79  
Thermostat information including date  
code and software versions are displayed.  
NOTE: Press and hold the increase ꢀ and decrease ꢁ  
keys for three seconds to exit the system test  
mode. The system test times out after five min-  
utes without any key presses.  
Table 4. Installer System-Test Options.  
Keys to  
Press  
Test  
Number  
Description  
Heating Equipment System-Test  
i
10  
11  
10  
Enter heating equipment system-test. (Set System switch to Heat on switch models.)  
Heat comes on. When Installer Setup number 02 is 01, the system fan is also energized.  
Heat and system fan turn off.  
ꢀ
ꢁ
Cooling Equipment System Test  
i
30  
Change from heating to cooling equipment system test. (Set system switch to Cool on  
switch models.)  
ꢀ
ꢁ
31  
30  
Cool and system fan come on.  
Cool and system fan turn off.  
Fan Equipment System Test (T8501D only)  
i
40  
41  
40  
Change from cooling to fan equipment system-test.  
ꢀ
ꢁ
Fan comes on.  
Fan turns off.  
7
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T8501 MICROELECTRONIC THERMOSTATS  
Table 4. Installer System-Test Options. (Continued)  
Keys to  
Press  
Test  
Number  
Description  
Key or Switch Operation System-Testa  
IMPORTANT  
Test numbers are displayed only when the system is configured for the selected function.  
Example: Numbers 60, 61 and 62 are the only numbers that are displayed when a system is configured for  
heat only.  
System Key or Switch System Test (When System switch is used, move switch to see Test Numbers.)  
i
60  
61  
62  
63  
64  
Change from cooling or fan to key operation system test.  
Heat test number is displayed. (Set System switch to Heat.)  
Off test number is displayed. (Set System switch to Off)  
Cool test number is displayed. (Set System switch to Cool.)  
Auto Test number is displayed.  
System  
System  
System  
System  
Fan Key System Test (Fan switch cannot be tested)  
Fan  
Fan  
a
68  
69  
Available on select models.  
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T8501 MICROELECTRONIC THERMOSTATS  
4.  
Press the increase ꢀ key again to display the soft-  
ware revision number (Example: 001 = revision  
number 1).  
THERMOSTAT INFORMATION  
1.  
Press the i key to access the thermostat informa-  
tion.  
M6791  
M4864  
5. Press the increase ꢀ key again to display the  
EEPROM identification code. (Example: 222 =  
EEPROM ID 222.)  
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 (Exam-  
ple: 026 = February 1996).  
M4867  
6.  
Press and hold the increase ꢀ and decrease ꢁ  
keys together, until the room temperature is dis-  
played, to exit the system test mode. The system  
test times out after five minutes without any key  
presses.  
M4865  
3.  
Press the increase ꢀ key again to display the soft-  
ware identification code. (Example: 02 = software  
ID code 2).  
CHECKOUT  
Outdoor Temperature Sensor  
(
Select Models)  
Allow the outdoor temperature sensor to take in the  
outdoor air for a minimum of five minutes before taking a  
reading. With an accurate thermometer ±1°F (±0.5°C),  
measure the temperature at the sensor location, allowing  
time for the thermometer to stabilize before reading.  
Match the thermometer reading to the outdoor  
temperature display at the thermostat.  
M4866  
9
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T8501 MICROELECTRONIC THERMOSTATS  
TROUBLESHOOTING GUIDE  
Table 5. Troubleshooting Guide.  
Possible Cause  
Symptom  
Action  
Display will not  
come on.  
Thermostat is not being  
powered.l  
•
Check that C terminal is connected to the system  
transformer.  
Check for 24 Vac between C and R or RH 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.  
Thermostat microprocessor is  
locked up.  
Remove the thermostat from the wallplate for two minutes. After  
two minutes, replace the thermostat on the wallplate.  
Temperature  
Room temperature display has Enter Installer Setup number 37 and reconfigure the display.  
display is incorrect. been reconfigured.  
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:  
limits were reached. • Heating limits are 40 to 90°F (4.5 to 32°C)  
• Cooling limits are 45 to 99°F (7 to 37°C).  
settings will not  
change. (Example:  
Cannot set the  
heating higher or  
the cooling lower.)  
The setpoint temperature range Check Installer Setup numbers 34 and 35 and reconfigure the  
stops were configured.  
setpoint stops.  
Heating will not  
come on.  
No power to the thermostat.  
•
•
Check that C terminal is connected to the system  
transformer.  
Check for 24 Vac between C and R or RH 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 System 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.  
System selection is not set to  
Heat.  
Set system selection to Heat.  
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T8501 MICROELECTRONIC THERMOSTATS  
Table 5. Troubleshooting Guide. (Continued)  
Symptom  
Possible Cause  
Action  
Cooling will not  
come on.  
No power to the thermostat.  
•
•
Check that C terminal is connected to the system  
transformer.  
Check for 24 Vac between C and R or RC and Y 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.  
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.  
Systemonindicator Fan operation set for 00  
is displayed, but no (conventional heat) when it  
Enter Installer Setup mode number 02 and reconfigure the fan  
operation.  
heat is being  
delivered.  
should be set for 01 (electric  
heat).  
Conventional heating equipment Wait a minute after seeing the On indicator and then check the  
turns on the fan when the  
furnace has warmed up to  
setpoint.  
registers.  
Heating equipment is not  
operating.  
Verify operation of heating equipment in self-test.  
Outdoor tempera- Option not activated.  
ture not displayeda  
Enter Installer Setup number 24 and set to 01. Thermostat must  
have OT terminals and a C7089B1000 installed.  
Outdoor  
temperature  
display is incorrecta  
Outdoor sensor is connected  
incorrectly.  
Refer to C7089B1000 installation instructions and check wiring  
between the thermostat and sensor.  
Wrong sensor.  
Replace sensor with C7089B1000 sensor.  
aSelect Models  
11  
69-0925—4  
href="
T8501 MICROELECTRONIC THERMOSTATS  
Automation and Control Solutions  
Honeywell  
985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
1
35 Dynamic Drive  
Scarborough, Ontario  
M1V 4Z9  
69-0925—4 G.H. Rev. 04-04  
www.honeywell.com/yourhome