T8624D Chronotherm
®
Deluxe Zone
Multistage Thermostat
INSTALLATION INSTRUCTIONS
APPLICATION
The T8624D Chronotherm® IV Deluxe ZoneMultistage
Thermostat provides electronic control of 24 Vac
multistage zoned heating and cooling system. Refer to
Table 1. Description of T8624 Thermostats.
Model Application Powering Method Changeover System Selection Fan Selection
T8624D Zone 1 on MABS II or
TotalZone® system
Requires common wire
to power supply
Table 1 for a general description of the thermostat.
The T8624 thermostat requires a common wire to
supply power.
Automatic or
manual
Heat-Off-Cool-Auto On-Auto
IV
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.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of the old 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.
3. Installer must be a trained, experienced service
technician.
4. After completing installation, use these instructions
to check out the product operation.
Location
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.
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.
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
X-XX UL
69-1074
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
WALL
ANCHORS
(2)
NO
WIRES
THROUGH WALL
YES
NO
5 FEET
[1.5 METERS]
Fig. 1. Typical location of thermostat.
Position the wallplate over the holes, pulling wires
WALL
Loosely insert the mounting screws into the holes.
Tighten mounting screws.
WIRING
All wiring must comply with local electrical codes and
ordinances. Refer to Fig. 3 and 4 for typical hookups. A
letter code is located near each terminal for identification.
NO
M10106
through the wiring opening.
MOUNTING
HOLES
MOUNTING
SCREWS
Fig. 2. Mounting the wallplate.
Use a pencil to mark the mounting holes. See Fig. 2.
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.
69-1074
M15044
CAUTION
Disconnect power before wiring to prevent
electrical shock or equipment damage.
Loosen the terminal screws on the wallplate and
connect the system wires. See Fig. 5.
IMPORTANT
Use 18 gauge, color-coded thermostat cable for
proper wiring.
Securely tighten each terminal screw.
Push excess wire back into the hole.
Plug the hole with nonflammable insulation to
prevent drafts from affecting the thermostat.
2
T8624D CHRONOTHERM
C7089B OUTDOOR
TEMPERATURE
SENSOR (OPTIONAL)
OG
NOTE:
Fig. 3. Typical wiring diagram for T8624 on zone 1
CHANGEOVER
CONTROL
THERMOSTAT
BCY1RW1W2Y2OTOT
ZONE 1
W2
TotalZone®
PANEL
L
THERMOSTAT
CONNECTIONS
G
Y
R
W
M6
M4
M1
WHEN USING W2 ON THE THERMOSTAT TO CONTROL THE
SECOND STAGE OF HEATING, MAKE SURE THE STAGE
JUMPER IS IN PLACE, ON THE TZ PANEL
TotalZone® control panel.
C7089B OUTDOOR
TEMPERATURE
SENSOR (OPTIONAL)
OG
O1
G1
B1
E1
THERMOSTAT
BCW1RY1W2Y2OTOT
ZONE 1
T8
T7
T6
T5
T4
M11418
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
Mounting Thermostat
Engage tabs at the top of the thermostat and
wallplate. See Fig. 6. Be sure to align the subbase
pins to avoid damage to the thermostat.
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.
A.
ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
B.
PRESS LOWER EDGE OF CASE TO LATCH.
M15043
Fig. 6. Mounting thermostat on wallplate.
M1
MABS II/L
PANEL
THERMOSTAT
CONNECTIONS
Fig. 4. Typical wiring diagram for T8624D on zone 1
MABS II control panel.
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
M11419
M4826
Fig. 5. Proper wiring technique.
3
69-1074
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
SET WAKE TIMES
AND SETPOINTS
INCREASE TIME SETTING
OR SCROLL FORWARD
THROUGH INSTALLER
SETUP AND SELF-TEST
SET CURRENT
DAY AND TIME
RETURN TO
NORMAL
OPERATIONS
ENTER
INDEFINITE
OR TIMED
HOLD MODE
SET CURRENT OR
PROGRAM DAY
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME
COPY ONE PROGRAMMED
DAY TO ANOTHER DAY
Run
Program
Hold Temp
Set Current
Time Set Program
Day/Time
Day
Daylight
Copy
Time
Fig. 7. T8624D key locations and descriptions.
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 Self-Test,
•display outdoor temperature (select models),
• set the system operation,
• set the fan operation.
See Fig. 7 for the location of the keys.
SETTINGS
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. 8. The fan settings can be set for
each program period individually. The system selection is
for all the program periods.
System settings control the thermostat operation as
follows:
Heat: The thermostat controls the heating.
Off: Both the heating and cooling are off.
INCREASE TEMPERATURE
Leave
Wake
Heat/Cool
Settings
SETTING OR SCROLL
FORWARD THROUGH
INSTALLER SETUP OPTIONS
DECREASE TEMPERATURE
SETTING OR SCROLL
BACKWARD THROUGH
INSTALLER SETUP OPTIONS
DISPLAY INFORMATION
SUCH AS PRESENT
SETTINGS AND OUTDOOR
TEMPERATURE
SELECT FAN
OPERATION
SELECT SYSTEM
OPERATION
Return
System Fan
SET LEAVE TIMES
AND SETPOINTS
SET RETURN TIMES
AND SETPOINTS
Leave
Wake
Heat/Cool
Settings
DECREASE TIME SETTING
OR SCROLL BACKWARD
THROUGH INSTALLER
SETUP AND SELF-TEST
Fan settings control the system fan as follows:
Return Sleep
System Fan
CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes between
heating and cooling operation, depending on the
indoor temperature.
On: Fan operates continuously.
Auto: Fan operates with equipment.
Time Set Program
Run
Set Current
Program
Day/Time
Hold Temp
Day
Daylight
Copy
Time
Fig. 8. T8624D System and Fan key locations.
NOTE: Always press the keys with your fingertip or
similar blunt tool. Sharp instruments like a pen or
pencil point can damage the keyboard.
SET SLEEP
TIMES AND
SETPOINTS
M10405
Sleep
M15042
System
Fan
69-1074
4
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
Temperature Settings
Refer to Table 2 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
Owners Guide, form number 69-1073, for complete
instructions on changing the program.
Table 2. Default Program Settings.
Period Time
Wake 6:00 AM 70°F
Leave 8:00 AM 62°F
Return 6:00 PM 70°F
Sleep 10:00 PM 62°F
Heat
Setpoint
(21°C)
(16.5°C)
(21°C)
(16.5°C)
Cool
Setpoint
78°F
(25.5°C)
85°F
(29.5°C)
78°F
(25.5°C)
82°F
(28°C)
Fan
Setting
Auto
Auto
Auto
Auto
INSTALLER SETUP
NOTE: For most applications, the thermostat factory-
settings will 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.
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 3. The table
includes all the configuration options and the factorysettings for the T8624.
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. 9 and 10.
— 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.
AM
PM
In
Wait
Recovery
Temporary Setting Enrg
%Humid
Cool
Auto
Outdoor
Repl Batt
On
Heat
DST
Sav
Room
Auto
M10345
Set Program
Hold for
Em Ht
Aux Ht
Mon
TueWedThuFriSatSun
Wake
LeaveReturnSleep
System Fan
Off Auto
Heat
Em
Start Time
Cool
Set Day/Time
Fig. 9. Display of all the segments of the LCD.
INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2
OF TABLE 3)
FACTORY SETTING
OR OTHER CHOICE
DISPLAY (COLUMN 3
OR 5 OF TABLE 3)
M10349
Fig. 10. Display of Installer Setup number and setting.
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 3 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.
5
69-1074
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
Table 3. Thermostat Installer Setup Options.
Installer
Select
Setup Number
(Press Time
▲ key to
change)
Factory-Setting
Display Description Display Description
Other Choices
(Press ▲ or ▼ key to change)
Actual
Setting
Not used 1 thru 4 — — — — —
Heating cycle
a
rate
5
Stage 2 3 or 9 3—3 cph used for steam
6
systems
6—6 cph factory setting for
all stages of system
9—9 cph used for electric
heat
Not used 6 thru 11 — — — — —
System setting
adjustment
Adaptive
Intelligent
Recovery™
control
Degree temperature display
12 1 Manual changeover 0 or 2 0—Auto changeover
2—Fixed auto changeover
13 0 Adaptive Intelligent
14 0 Temperature is
Recovery™ control is
activated (system
starts early so setpoint
is reached by start of
program period)
displayed in °F
1 Conventional recovery
(system starts recovery at
programmed time)
1 Temperature is displayed
in °C
Not used 15 — — — — —
Clock format 16 0 12-hour clock format 1 24-hour clock format
Not used 17 and 18 — — — — —
Extended fan
operation in
heating
Extended fan
operation in
cooling
19 0 No extended fan
20 0 No extended fan
operation after the call
for heat ends
operation after the call
for cool ends
1 Fan operation is extended
90 seconds after the call for
heat ends.
1 Fan operation is extended
90 seconds after the call for
cool ends.
Not used 21 thru 23 — — — — —
Outdoor temp-
erature display
(models with OT
terminals)
24 0 No outdoor temperature
is displayed
1 Outdoor temperature is
displayed. Needs a
C7089B1000 Outdoor Sensor
to operate.
Not used 25 thru 32 — — — — —
a
The cycle rate for the second stage of heat is adjustable with 6 cph being the factory setting.
(Continued)
69-1074
6
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
Table 3. Thermostat Installer Setup Options (Continued).
Installer
Select
Minimum off time
for the
compressor
Temperature
range stops in
heating
Temperature
range stops in
cooling
Setup Number
(Press Time
▲ key to
change)
33 55 minute minimum off
34 90 Highest setpoint
35 45 Lowest setpoint cooling
Factory-Setting
Display Description Display Description
time for the compressor
heating can be set to
can be set to
0 thru 4 Minimum number of minutes
40 to 89 Temperature range (1°F
46 to 99 Temperature range (1°F
Other Choices
(Press ▲ or ▼ key to change)
(0 thru 5) the compressor will
be off between calls for the
compressor
increments) heating setpoint
can be set to
increments) cooling setpoint
can be set to
Actual
Setting
Not used 36 — — — — —
Temperature
display
adjustment
37 0 No difference in
displayed temperature
and actual room
temperature
1 thru 6 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
4—Display adjusts to 1°F
lower than actual room
temperature
5—Display adjusts to 2°F
lower than actual room
temperature
6—Display adjusts to 3°F
lower than actual room
temperature
IMPORTANT
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 the new settings. Be sure to
set the current day and time immediately.
Setting Current Day and Time
Press Set Current Day/Time.
NOTE: On initial power up or after an extended
power loss, 1:00 pm flashes on the dispaly
until a key is pressed.
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
Set Current
Day/Time
Day/Time
Program
Heat/Cool
Hold Temp
Day
Settings
Daylight
Copy
Time
System Fan
Mon
Set Day/Time
PM
M10312
Press Day until the current day is displayed.
NOTE: Sun=Sunday, Mon=Monday,
Tue=Tuesday, Wed=Wednesday,
Thu=Thursday, Fri=Friday, Sat=Saturday.
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
System Fan
Tue
Day/Time
Day
Program
Heat/Cool
Hold Temp
Day
Settings
Daylight
Copy
Time
7
Set Day/Time
PM
M10313
69-1074
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
Press Time ▲▲ or Time ▼▼ until the current time is
displayed.
NOTE: Tapping the Set Current Day/Time will
advance the time in one hour increments.
Time
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
Day/Time
Program
Heat/Cool
Hold Temp
NOTE: If the current time is Daylight Savings
Time, press Daylight Time until DST is
displayed.
Run
Program
Daylight
Hold Temp
Time
Day
Daylight
Time
Set Current
Day/Time
Day
Daylight
Time
Settings
Copy
Time Set Program
Leave
Wake
Heat/Cool
Settings
Copy
System Fan
Return Sleep
System Fan
Set Day/Time
AM
Tue
M10314
Set Day/Time
AM
Tue
DST
M10315
Press Run Program.
Run
Program
Time Set Program
Set Current
Run
Leave
Wake
Return Sleep
Day/Time
Program
Heat/Cool
Hold Temp
Day
Settings
Daylight
Copy
Time
System Fan
Wake
AM
Tue
System Fan
Heat
DST
M10316
INSTALLER SELF-TEST
Use the Installer Self-Test to check the thermostat
operation. Refer to Table 4 for a list of the available selftests.
To start the self-test:
CAUTION
The minimum off time for compressors is bypassed
during the Installer Self-Test. Equipment damage
can occur if the compressor is cycled too quickly.
Press and hold the increase ▲ and decrease ▼ keys at
the same time until 10 appears. All segments of the
display will be displayed before the 10 appears. See
Fig. 11 and 12.
Table 4. Tests Available In The Installer Self-Test.
Test
Number Self-Test Description
10-19 Heating equipment can be turned on and
off
30-39 Cooling equipment can be turned on and
off
40-49 Fan equipment can be turned on and off
60 0 to
60 19
Set Program
Hold for
Em Ht
Aux Ht
Mon
Wake
Em
Room
Auto
Keyboard keys test
70-79 Thermostat information including date
code and software versions are displayed
AM
PM
In
Wait
Recovery
DST
Temporary Setting Enrg
Heat
Set Day/Time
Start Time
TueWedThuFriSatSun
LeaveReturnSleep
System Fan
Off Auto
Cool
Heat
Fig. 11. Display of all the segments of the LCD.
TEST NUMBER
Fig. 12. Display of test number.
Refer to Table 5 for the directions and results of the
specific tests.
NOTE: Press Time ▲▲ to advance the next test and
Time ▼▼ to go back to the previous test. Press
Run Program to exit the self-test from any test
number except 60 series tests.
Cool
Auto
Sav
Room
%Humid
Outdoor
Repl Batt
Auto
On
M10345
M10257A
69-1074
8
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
Table 5. Installer Self-Test Options.
Key to
Press
Test
Number Description
Heating Equipment Self-Test
Time ▲ 10 Enter heating equipment self-test.
▲ 11 Stage-one heat comes on. The system fan is also energized.
▲ 12 Stage-two heat comes on. Stage-one heat and system fan remain on.
▼ 11 Stage-two heat turns off.
▼ 10 Stage-one heat and system fan turn off.
Cooling Equipment Self-Test
Time ▲ 30 Change from heating to cooling equipment self-test.
▲ 31 Stage-one cool and system fan come on.
▲ 32 Stage-two cool comes on. Stage-one cool and system fan remain on.
▼ 31 Stage-two cool turns off.
▼ 30 Stage-one cool and system fan turn off.
Fan Equipment Self-Test
Time ▲ 40 Change from cooling to fan equipment self-test.
▲ 41 Fan comes on.
▼ 40 Fan turns off.
Key Operation Self-Test
Time ▲ 60 2 Change from fan to key operation self-test.
NOTE: Press any key and the displayed numbers will change. Press Time ▼▼ to go to the previous test and Time ▲▲ to
go to the next test. The Run Program Key will not exit this test. Press Time ▲▲ or Time ▼▼ and then the Run
Program Key to exit.
9
69-1074
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
THERMOSTAT INFORMATION
Press the Time ▲ ▲ key to access the thermostat
information.
M4934
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: 027=February 1997).
M10351
Press the increase ▲ key again to display the
software identification code. (Example: 02 =
software ID code 2)
Press the increase ▲ key again to display the
software revision number (Example: 001=Revision
number 1).
Press the increase ▲ key again to display the
EEPROM identification code. (Example: 314 =
EEPROM ID 314)
Press the Run Program key to exit the self-test. The
self-test times out after four minutes without any key
presses.
CHECKOUT
Outdoor Temperature Sensor
(select models)
Allow the outdoor temperature sensor to soak in the
M4932A
outdoor air for a minimum of five minutes before taking
a reading.
TROUBLESHOOTING GUIDE
Symptom Possible Cause Action
Display will not
come on.
Temperature
display is
incorrect.
Thermostat is not being
powered.
Thermostat is not fully
connected to wallplate.
Room temperature display
has been reconfigured.
Thermostat is configured
for °F or °C display.
Bad thermostat location. Relocate the thermostat.
• Check for 24 Vac between R and C 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 zone control
panel—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Verify that thermostat is correctly positioned and securely latched
to wallplate.
Enter Installer Setup number 37 and reconfigure the display.
Enter Installer Setup number 14 and reconfigure the display.
M10229
M4933A
(Continued)
69-1074
10
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
Troubleshooting Guide (Continued).
Symptom Possible Cause Action
Temperature
settings will not
change. (Example:
Cannot set the
heating higher or
the cooling lower.)
Heating will not
come on.
The upper or lower
temperature limits were
reached.
The setpoint temperature
range stops were
configured.
No power to the
thermostat.
Check the temperature setpoints:
• Heating limits are 40 to 90°F (7 to 31°C)
• Cooling limits are 45 to 99°F (9 to 37°C).
Check Installer Setup numbers 34 and 35 and reconfigure the
setpoint stops.
• Check for 24 Vac between R and C 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 zone control
panel—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
Heating will not
come on.
Cooling will not
come on.
Thermostat minimum off time
is activated.
System selection is not set
to Heat.
Heating setpoint is below
room temperature.
No power to the
thermostat.
Wait up to five minutes for the system to respond.
Set system selection to Heat.
Check heating setpoint. Set heating setpoint to desired
temperature.
• Check for 24 Vac between R and C.
— 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 zone control
panel—replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
System on indicator (flame=heat,
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.
Outdoor temperature not displayed
Outdoor
temperature
display is
incorrect
a
Select models.
a
Thermostat minimum off time
is activated.
System selection is not set
to Cool.
Cool setpoint is above
room temperature.
Heating or cooling
equipment is not
operating.
Option not activated. Enter Installer Setup number 24 and set to 1. Thermostat must
a
Outdoor sensor is
connected incorrectly.
Wrong sensor. Replace sensor with C7089B1000 sensor.
• Wait up to five minutes for the system to respond.
•Enter Installer Setup number 33. Reconfigure minimum off
time (if required).
Set system selection to Cool.
Check cooling setpoint. Set cooling setpoint to desired
temperature.
Verify operation of heating or cooling equipment in self-test.
have OT terminals and a C7089B1000 installed.
Refer to C7089B1000 installation instructions and check wiring
between the thermostat and sensor.
11
69-1074
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
57 Bushes Lane
Elmwood Park, NJ 07407-3204
69-1074
69-1074 J.H. 3-97 Printed in Taiwan R.O.C.
12
www.honeywell.com/yourhome
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