Honeywell T8524C Thermostat User Manual

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T8524C,D Multistage  
Microelectronic Thermostats  
INSTALLATION INSTRUCTIONS  
APPLICATION  
The T8524C, D Multistage Microelectronic Thermostat provides electronic control of 24 Vac two-stage heating and two-  
stage cooling systems. Refer to Table 1 for a general description of the thermostat. All T8524 Thermostats require a  
common wire to supply power.  
Table 1. Description of T8524 Thermostats.  
System  
Selection  
Fan  
Selection  
T8524 System Changeover  
Comments  
C
Heat-Cool  
Manual  
Heat-Off-Cool  
On-Auto System and fan selections are done by  
switches.  
D
Heat-Cool  
Automatic Heat-Off-Cool-Auto On-Auto System and fan selections are done by  
keyboard.  
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.  
CAUTION  
Disconnect power supply to prevent electrical  
shock or equipment damage.  
Location  
Contact your local waste management authority for  
instructions regarding recycling and the proper  
disposal of the old thermostat.  
Install the thermostat about 5 ft (1.5m) above the floor in  
an area with good air circulation at average temperature.  
See Fig. 1.  
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.  
INSTALLATION  
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.  
Installer must be a trained, experienced service  
technician.  
After completing installation, use these instructions  
to check out the product operation.  
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.  
3
.
.
4
1. Position and level the wallplate (for appearance  
only). The thermostat will function properly even  
when not level.  
®
U.S. Registered Trademark  
Copyright © 1997 Honeywell Inc. •  
•
All Rights Reserved  
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T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS  
YES  
NO  
NO  
5
FEET  
[
1.5 METERS]  
NO  
M10106  
Fig. 1. Typical location of thermostat.  
4.  
Position the wallplate over the holes, pulling wires  
through the wiring opening.  
WALL  
5
.
.
Loosely insert the mounting screws into the holes.  
Tighten mounting screws.  
WIRES  
THROUGH WALL  
6
WIRING  
WALL  
ANCHORS  
All wiring must comply with local electrical codes and  
ordinances. Refer to Fig. 3 for typical hookups. A letter  
code is located near each terminal for identification.  
(2)  
CAUTION  
Disconnect power before wiring to prevent  
electrical shock or equipment damage.  
MOUNTING  
HOLES  
1.  
Loosen the terminal screws on the wallplate and  
connect the system wires. See Fig. 4.  
MOUNTING  
SCREWS  
IMPORTANT  
Use 18 gauge, color-coded thermostat cable for  
M6530  
proper wiring.  
Fig. 2. Mounting the wallplate.  
2.  
Securely tighten each terminal screw.  
2
.
.
Use a pencil to mark the mounting holes. See Fig. 2.  
Remove the wallplate from the wall and drill two  
3. Push excess wire back into the hole.  
3
4.  
Plug the hole with nonflammable insulation to  
prevent drafts from affecting the thermostat.  
3
/16 inch holes in the wall (if drywall) as marked. For  
firmer material such as plaster or wood, drill two  
/32 inch holes. Gently tap anchors (provided) into  
the drilled holes until flush with the wall.  
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T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS  
THERMOSTAT  
Y2  
A. ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.  
RC  
Y1  
G
O
C
B
W2  
W1  
R
OT OT  
2
FAN  
RELAY  
COMPRESSOR  
CONTACTOR 2  
HEAT  
RELAY  
2
OUTDOOR  
SENSOR  
COMPRESSOR  
CONTACTOR 1  
COOL  
DAMPER  
HEAT  
DAMPER  
HEAT  
RELAY  
1
3
3
B. PRESS LOWER EDGE OF CASE TO LATCH.  
1
L1  
L1  
(HOT)  
(
HOT)  
L2  
1
L2  
COOLING  
TRANSFORMER  
HEATING  
TRANSFORMER  
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD  
PROTECTION AS REQUIRED.  
JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A  
ONE TRANSFORMER SYSTEM.  
CAN BE USED FOR CHANGEOVER VALVE ON HEAT  
PUMP SYSTEMS.  
M11309  
M6798A  
Fig. 3. Typical hookup of T8524 in a multistage  
heating and cooling system.  
Fig. 5. Mounting thermostat on wallplate.  
NOTE: To remove the thermostat from the wall, first pull out  
at the bottom of the thermostat; remove top last.  
INCREASE  
TEMPERATURE  
SETTING  
DECREASE  
TEMPERATURE  
i
SETTING  
DISPLAY PRESENT  
SETTINGS AND SCROLL  
THROUGH INSTALLER  
SETUP MODES  
(INFORMATION KEY)  
M6801  
FOR STRAIGHT  
INSERTION STRIP  
FOR WRAPAROUND  
Fig. 6. Thermostat key locations and descriptions.  
5/16 IN. (8 MM).  
INSERTION STRIP  
/16 IN. (11 MM).  
7
M4826  
SETTINGS  
Fig. 4. Proper wiring technique.  
System and Fan Settings  
Mounting Thermostat  
System settings control the thermostat operation as  
follows:  
1.  
Engage tabs at the top of the thermostat and  
wallplate. See Fig. 5.  
Heat: The thermostat controls the heating.  
Off: Both the heating and cooling are off.  
Cool: The thermostat controls the cooling.  
Auto (T8524D only): The thermostat automatically  
changes between heating and cooling operation,  
depending on the indoor temperature.  
2.  
Press lower edge of case to close and latch.  
Using Thermostat Keys  
The thermostat keys are used to:  
•
•
•
•
•
set temperature,  
display present setting,  
configure Installer Setup,  
check System Test,  
display outdoor temperature (select models).  
Fan settings control the system fan as follows:  
On: Fan operates continuously.  
Auto: Equipment controls fan.  
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 Figs. 7 and 8.  
T8524D has keys to:  
•
•
set the system operation,  
set the fan operation.  
See Fig. 6 for key information.  
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T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS  
A combination of key presses are required to use the  
Installer Setup feature.  
—
To enter the Installer Setup mode, press and hold the  
Information key with the increase ▲ and decrease  
keys until the first number is displayed. All display  
i
i
▲
HEAT  
OFF  
COOL  
segments appear for approximately three seconds  
before the number is displayed. See Fig. 9 and 10.  
To advance to the next Installer Setup number, press  
the Information i key.  
To change a setting, use the increase ▲ or de-  
crease ▲ key.  
HEAT  
OFF  
COOL  
SYSTEM  
Selection for heating or cooling  
equipment operation.  
FAN  
ON AUTO  
On  
-
Fan runs continuously  
—
—
—
Heat  
Off  
Cool  
-
Heating equipment  
No equipment  
Cooling equipment  
Auto  
-
Fan runs when  
heating or cooling  
equipment operates  
-
-
ON AUTO  
To exit the Installer Setup, press and hold the  
i key until the display returns to normal  
Information  
approximately three seconds). The display scrolls the  
(
M10146  
numbers backwards to get to the normal display. The  
Installer Setup is automatically exited if no key  
presses are made for five minutes.  
Fig. 7. T8524C system and fan switches location.  
IMPORTANT  
Only configurable numbers are shown on the  
device. Example: If the thermostat does not have  
a system key, Installer Setup Number 12 will not  
be displayed. Review Table 2 factory-settings  
and mark any desired changes in the Actual  
Setting column. When Installer Setup in com-  
plete, review the settings to confirm that they  
match the system.  
i
System  
System  
Fan  
Press to select  
heating or cooling  
equipment.  
Press to select  
heating or cooling  
equipment.  
Em. Ht.-Emergency heating  
Heat— Heating equipment  
On— Fan runs continuously  
Auto—Fan runs when  
heating or cooling  
Off  
— No equipment  
System  
Fan  
Cool—Cooling equipment  
Auto—Thermostat  
automatically selects  
heating and cooling  
equipment.  
equipment operates  
Fan  
1
Em Ht Temporary Setting  
Aux Ht  
Remote  
Room  
%
Humid  
1
CHECK LIGHT ON SELECT MODELS  
M10147  
Outdoor  
Heat Cool  
Repl  
Batt  
Wait  
Fig. 8. T8524D system and fan keys location.  
System  
Fan  
Em HeatOffCool Auto Only OnAuto  
NOTE: Always press the system and fan keys with your  
fingertip or similar blunt tool. Sharp instruments  
like a pen or pencil point can damage the  
keyboard.  
M4844  
Fig. 9. Display of all the segments of the LCD.  
MODE NUMBER DISPLAY  
(COLUMN 2 OF TABLE 2)  
Temperature Settings  
FACTORY SETTING OR  
OTHER CHOICE DISPLAY  
(COLUMN 3 OR 5 OF TABLE 2)  
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  
changed appears.  
i key until the setting to be  
INSTALLER SETUP  
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 System Test  
section.  
M10105  
Fig. 10. Display of Installer Setup mode and setting.  
The Installer Setup is used to customize the thermostat to  
specific systems. Installer Setup Numbers are listed in  
Table 2. The table includes all the configuration options  
available.  
CAUTION  
Electric heat systems must be configured to 01 in  
Installer Setup 02 to prevent equipment damage  
caused by the system running without the fan.  
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T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS  
Table 2. Thermostat Installer Setup Options.  
Other Choices  
Installer Setup  
Number  
(
Press  
to change)  
01  
i
key  
Factory-Setting  
(Press ▲ or ▲ key to change)  
Actual  
Select  
Not used  
Fan operation 02  
Display  
Description  
Display Description  
Setting  
—
—
—
—
—
a
00  
Conventional applica-  
tions where equipment  
controls fan operation in  
heat mode  
01  
Heat pump and electric heat  
applications where  
thermostat controls fan  
operation in heat mode  
Not used  
03 and 04  
—
—
—
—
—
Stage-two  
heating cycle  
rate  
05  
06  
6 cph used for  
conventional systems  
01, 03, 01—1 cph used for radiant  
or 09 floor heat, gravity systems  
03—3 cph used for hot water  
systems or high efficiency  
furnaces  
0
9—9 cph used for electric  
heat systems  
Not used  
06 thru 11  
12  
T8524D only)  
—
—
—
—
—
—
Changeover  
(
01  
Manual changeover  
00  
Automatic changeover  
Not used  
13  
14  
—
—
—
—
Degree  
temperature  
display  
00  
Temperature is  
displayed in °F  
01  
Temperature is displayed in  
°C  
Not used  
15 thru 18  
—
—
—
—
—
Extended fan 19  
operation in  
heating  
00  
No extended fan  
operation after the call  
for heat ends  
01  
Fan operation is extended  
90 seconds after the call for  
heat ends  
a,b  
Extended fan 20  
operation in  
cooling  
00  
No extended fan  
operation after the call  
for cool ends  
01  
—
Fan operation is extended  
90 seconds after the call for  
cool ends  
a
Not used  
21 thru 23  
—
—
—
—
—
Outdoor  
24  
00  
No outdoor temperature 01  
is displayed  
Outdoor temperature is  
displayed. Needs a  
C7089B1000 Outdoor  
Sensor to operate.  
temperature  
a
display  
Not used  
25 thru 29  
30  
—
—
—
—
Deadband  
03  
Heating and cooling  
04 thru Heating and cooling  
setpoints can be set no 10 setpoints can be set no  
closer than 3°F (1.5°C) closer than the chosen  
value:  
04—4°F (2°C)  
05—5°F (2.5°C)  
06—6°F (3°C)  
07—7°F (3.5°C)  
08—8°F (4°C)  
09—9°F (4.5°C)  
10—10°F (5°C)  
Not used  
31 and 32  
33  
—
—
—
—
—
Minimum off  
time for the  
compressor  
05  
5 minute minimum off  
time for the compressor 02, 03 (0 thru 5) the compressor will  
00, 01, Minimum number of minutes  
or 04  
be off between calls for the  
compressor  
a
b
Available on select models.  
Installer Setup Number 02 must be set to 01 to extend fan operation.  
(Continued)  
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Table 2. Thermostat Installer Setup Options (continued).  
Installer Setup  
Number  
Other Choices  
(Press  
i
key  
Factory-Setting  
Description  
Heating setpoint can be 40 thru Number can be set  
(Press ▲ or ▲ key to change)  
Actual  
Select  
Heating  
to change)  
Display  
90  
Display  
Description  
Setting  
34  
35  
setpoint range  
set no higher than 90°F 90 anywhere between 40 and  
90 in 1°F increments  
b
Cooling setpoint can be 45 thru Number can be set  
b
set no lower than 45°F 99 anywhere between 45 and  
99 in 1°F increments  
a
stop  
b
Cooling  
45  
b
setpoint range  
a
stop  
Not used  
36  
37  
—
—
—
—
—
Temperature  
display  
adjustment  
00  
No difference in  
displayed temperature  
and actual room  
temperature  
-3 thru 1—Display adjusts to 1°F  
3
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
b
Available on select models.  
T8524D is 48°F (9°C).  
IMPORTANT  
Review the settings to confirm that they match  
the system.  
INSTALLER SYSTEM TEST  
Use the Installer System Test to check the thermostat  
configurations and operation. Refer to Table 3 for a list of  
the available system tests.  
M6792  
TEST MODE  
NUMBER  
IMPORTANT  
To start the system test::  
T8524C models must set the switches to the  
equipment that is being checked for the equip-  
ment to operate.  
NOTE: The minimum off time for compressors is  
bypassed during the Installer System Test.  
NOTE: Press and hold the increase ▲ and decrease ▲  
keys for three seconds to exit the System Test.  
The System Test times out after five minutes  
without any key presses.  
Press and hold the increase ▲ and decrease ▲ keys, at  
the same time, until two zeros appear. All segments of the  
LCD are displayed before the two zeros appear.  
Table 3. Tests Available In The Installer System Test.  
Test  
Em Ht Temporary Setting  
Aux Ht  
Remote  
Room  
%Humid  
Number  
System Test Description  
Outdoor  
Heat Cool  
10-19  
Heating equipment can be turned on and off  
Cooling equipment can be turned on and off  
Repl  
Batt  
Wait  
30-39  
System  
Fan  
Em HeatOffCool Auto Only OnAuto  
40-49  
Fan equipment (T8524D only) can be turned  
on and off.  
M4844  
6
0-69  
0-79  
System key or system switch position test  
7
Thermostat information including date code  
and software versions are displayed  
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T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS  
Table 4. Installer System Test Options.  
Description  
Key to  
Press  
Test  
Number  
Heating Equipment System test  
i
10  
11  
12  
11  
10  
Enter heating equipment system test. (Set system switch to HEAT on T8524C.)  
a
▲
▲
▲
▲
Stage-one heat comes on. The system fan is also energized.  
Stage-two heat comes on. Stage-one heat and system fan remain on.  
Stage-two heat turns off.  
Stage-one heat and system fan turn off.  
Cooling Equipment System test  
i
30  
31  
32  
31  
30  
Enter cooling equipment system test. (Set system switch to COOL on T8524C.)  
Stage-one cool and system fan come on.  
▲
▲
▲
▲
Stage-two cool comes on. Stage-one cool and system fan remain on.  
Stage-two cool turns off.  
Stage-one cool and system fan turn off.  
Fan Equipment System test (T8524D only)  
i
▲
40  
41  
40  
Change from cooling to fan equipment system test.  
Fan comes on.  
Fan turns off.  
▲
Key or Switch Operation System test  
IMPORTANT  
Test Numbers will only be displayed when the system is configured for the selected function.  
EXAMPLE: Numbers 60, 61 and 62 are the only numbers that will be displayed when a system  
is configured for heat only.  
SYSTEM KEY OR SWITCH SYSTEM TEST (Move switch to see Test Numbers on T8524C.)  
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 on T8524C.)  
Off Test Number is displayed. (Set system switch to OFF on T8524C.)  
Cool Test Number is displayed. (Set system switch to COOL on T8524C.)  
Auto Test Number is displayed.  
System  
System  
System  
System  
FAN KEY SYSTEM TEST (T8524D only)  
Fan  
Fan  
68  
69  
Fan on Test Number is displayed.  
Fan off Test Number is displayed.  
a
System fan is energized only if set for electric heat.  
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.  
Thermostat Information  
Press the Information i key to access the  
thermostat information.  
1.  
(Example: 026 = February 1996)  
M4864  
M4865  
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3.  
Press the increase ▲ key again to display the  
software identification code.  
5. Press the increase ▲ key again to display the  
EEPROM identification code.  
(Example: 02 = software ID code 2)  
(Example: 222 = EEPROM ID 222)  
M4866  
M4867  
4.  
Press the increase ▲ key again to display the  
software revision number.  
6. Press and hold the increase ▲ and decrease ▲  
keys together, until the room temperature is  
(Example: 001 = revision number 1)  
displayed, to exit the System Test. The System Test  
times out after five minutes without any key presses.  
CHECKOUT  
Outdoor Temperature Sensor  
(Where Applicable)  
Allow the outdoor temperature sensor to soak 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.  
M6791  
TROUBLESHOOTING GUIDE  
Symptom  
Possible Cause  
Action  
Display will not  
come on.  
Thermostat is not being  
powered.  
•
•
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.  
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.  
a
or °C display.  
Bad thermostat location.  
The upper or lower temperature Check the temperature setpoints:  
Relocate the thermostat.  
Temperature  
settings will not  
change. (Example:  
Cannot set the  
limits were reached.  
•
•
Heating limits are 40 to 90°F (7 to 31°C)  
Cooling limits are 45 to 99°F (9 to 37°C) except T8524D  
cooling limits are 48 to 99°F  
heating higher or  
the cooling lower.)  
The setpoint temperature range Check Installer Setup mode numbers 34 and 35 and  
stops were configured. reconfigure the setpoint stops.  
a
Available on select models.  
(Continued)  
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T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS  
TROUBLESHOOTING GUIDE (Continued)  
Symptom  
Possible Cause  
Action  
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 at the equipment is in the  
Off position—set to 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.  
•
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 system switch at the 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  
activated.  
•
•
Wait up to five minutes for the system to respond.  
Enter Installer Setup mode number 33. Reconfigure  
minimum off time (if required).  
System selection is not set to  
Cool.  
Set system selection to Cool.  
Cooling setpoint is above room Check cooling setpoint. Set cooling setpoint to desired  
temperature.  
temperature.  
Heating or cooling Heat or cool circuit is opening  
Add resistor in parallel with load or install interface relay.  
comes on  
momentarily and  
shuts off  
up or becoming high  
impedance.  
System On  
Fan operation set for 00  
(conventional heat) when it  
should be set for 01 (electric  
heat).  
Enter Installer Setup mode number 02 and reconfigure the fan  
operation.  
indicator is lit, but  
no heat is being  
delivered.  
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 equipment is not  
operating.  
Verify operation of heating equipment in system test.  
Outdoor  
temperature  
not displayed  
Option not activated.  
Enter Installer Setup mode number 24 and set to 01.  
Thermostat must have OT terminals and a C7089B1000  
installed.  
a
Outdoor  
temperature  
Outdoor sensor is connected  
incorrectly.  
Refer to C7089B1000 installation instructions and check wiring  
between the thermostat and sensor.  
a
display is incorrect Wrong sensor.  
Replace sensor with C7089B1000 sensor.  
a
Available on select models.  
9
69-1055-1  
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T8524C,D MULTISTAGE MICROELECTRONIC THERMOSTATS  
69-1055—1  
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1
69-1055-1  
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Home and Building Control  
Honeywell Inc.  
Honeywell Plaza  
Home and Building Control  
Honeywell Limited-Honeywell Limitée  
155 Gordon Baker Road  
North York, Ontario  
P.O. Box 524  
Minneapolis, MN 55408-0524  
M2H 3N7  
9 - 1 0 55— 1J.H. Rev. 6-97  
www.honeywell.com/yourhome  

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