Honeywell CHRONOTERM IV T8624D User manual

X-XX UL
INSTALLATION INSTRUCTIONS
®U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • • All Rights Reserved
T8624D Chronotherm
®
IV
Deluxe Zone
Multistage Thermostat
APPLICATION
The T8624D Chronotherm® IV Deluxe ZoneMultistage
Thermostat provides electronic control of 24 Vac
multistage zoned heating and cooling system. Refer to
Table 1 for a general description of the thermostat.
The T8624 thermostat requires a common wire to
supply power.
Table 1. Description of T8624 Thermostats.
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.
Model Application Powering Method Changeover System Selection Fan Selection
T8624D Zone 1 on MABS II or
TotalZone® system Requires common wire to power supply Automatic or manual Heat-Off-Cool-Auto On-Auto
69-1074

69-1074 2
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
5 FEET
[1.5 METERS]
YES
NO
NO
NO
M10106
Fig. 1. Typical location of thermostat.
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.
Position the wallplate over the holes, pulling wires
through the wiring opening.
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.
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.
WIRES
THROUGH WALL
WALL
MOUNTING
HOLES
M15044
MOUNTING
SCREWS
WALL
ANCHORS
(2)

69-1074
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T8624D CHRONOTHERM
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IV DELUXE ZONE MULTISTAGE THERMOSTAT
Fig. 3. Typical wiring diagram for T8624 on zone 1
TotalZone® control panel.
Fig. 4. Typical wiring diagram for T8624D on zone 1
MABS II control panel.
M4826
FOR WRAPAROUND
INSERTION STRIP
7/16 IN. (11 MM).
FOR STRAIGHT
INSERTION STRIP
5/16 IN. (8 MM).
Fig. 6. Mounting thermostat on wallplate.
M15043
B. PRESS LOWER EDGE OF CASE TO LATCH.
A. ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE.
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 thermo-
stat; remove top last.
Fig. 5. Proper wiring technique.
OGBCY1RW1W2Y2OTOT
W2
L
G
Y
R
W
M6
M4
M1
THERMOSTAT
ZONE 1
M11418
TotalZone®
PANEL
THERMOSTAT
CONNECTIONS
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
NOTE:
C7089B OUTDOOR
TEMPERATURE
SENSOR (OPTIONAL)
OGBCW1RY1W2Y2OTOT
T8
T7
T6
T5
O1
G1
B1
E1
T4
M1
THERMOSTAT
ZONE 1
M11419
MABS II/L
PANEL
THERMOSTAT
CONNECTIONS
CHANGEOVER
CONTROL
C7089B OUTDOOR
TEMPERATURE
SENSOR (OPTIONAL)

69-1074 4
T8624D CHRONOTHERM
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IV DELUXE ZONE MULTISTAGE THERMOSTAT
Fig. 7. T8624D key locations and descriptions.
Cool: The thermostat controls the cooling.
Auto: The thermostat automatically changes between
heating and cooling operation, depending on the
indoor temperature.
Fan settings control the system fan as follows:
On: Fan operates continuously.
Auto: Fan operates with equipment.
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.
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.
M15042
Hold Temp
Run
Program
Copy
Daylight
Time
Set Current
Day/Time
System Fan
Time Set Program
Day
System
Fan
Wake Leave Return Sleep
Heat/Cool
Settings
M10405
Time Set Program
System Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
INCREASE TEMPERATURE
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
RETURN TO
NORMAL
OPERATIONS
ENTER
INDEFINITE
OR TIMED
HOLD MODE
SET CURRENT
DAY AND TIME
SET CURRENT OR
PROGRAM DAY
CHANGE BETWEEN
DAYLIGHT SAVINGS
AND STANDARD TIME
INCREASE TIME SETTING
OR SCROLL FORWARD
THROUGH INSTALLER
SETUP AND SELF-TEST
DECREASE TIME SETTING
OR SCROLL BACKWARD
THROUGH INSTALLER
SETUP AND SELF-TEST
COPY ONE PROGRAMMED
DAY TO ANOTHER DAY
SET WAKE TIMES
AND SETPOINTS
CHANGE BETWEEN
HEATING AND COOLING
SETPOINTS
SET LEAVE TIMES
AND SETPOINTS
SET RETURN TIMES
AND SETPOINTS
SET SLEEP
TIMES AND
SETPOINTS
SELECT SYSTEM
OPERATION
SELECT FAN
OPERATION

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T8624D CHRONOTHERM
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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.
—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.
Period Time Heat Setpoint Cool Setpoint Fan Setting
Wake 6:00 AM 70°F
(21°C) 78°F (25.5°C) Auto
Leave 8:00 AM 62°F
(16.5°C) 85°F (29.5°C) Auto
Return 6:00 PM 70°F
(21°C) 78°F (25.5°C) Auto
Sleep 10:00 PM 62°F
(16.5°C) 82°F (28°C) Auto
Fig. 9. Display of all the segments of the LCD.
Aux Ht
Heat
Auto
System Fan
Off Auto
Wake
Mon
Wait
In
Room
Outdoor
%Humid
Auto
Sav
AM
PM
Hold for
Cool Repl Batt
On
Recovery
DST
Cool
TueWedThuFriSatSun
LeaveReturnSleep
M10345
Set Program Set Day/Time Start Time Temporary Setting Enrg
Em Heat
Em Ht
M10349
INSTALLER SETUP
NUMBER DISPLAY
(COLUMN 2
OF TABLE 3)
FACTORY SETTING
OR OTHER CHOICE
DISPLAY (COLUMN 3
OR 5 OF TABLE 3)
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.
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 factory-
settings 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.

69-1074 6
T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
aThe cycle rate for the second stage of heat is adjustable with 6 cph being the factory setting.
(Continued)
Table 3. Thermostat Installer Setup Options.
Installer
Setup Number
(Press Time
▲ key to Factory-Setting Other Choices
(Press ▲or ▼key to change) Actual
Select change) Display Description Display Description Setting
Not used 1 thru 4 — — — — —
Heating cycle
ratea56Stage 2 3 or 9 3—3 cph used for steam
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 12 1 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)
1Conventional recovery
(system starts recovery at
programmed time)
Degree tempera-
ture display 14 0 Temperature is displayed in °F 1Temperature 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
19 0 No extended fan
operation after the call
for heat ends
1Fan operation is extended
90 seconds after the call for
heat ends.
Extended fan
operation in
cooling
20 0 No extended fan
operation after the call
for cool ends
1Fan 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 1Outdoor temperature is displayed. Needs a
C7089B1000 Outdoor Sensor
to operate.
Not used 25 thru 32 — — — — —

69-1074
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T8624D CHRONOTHERM
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IV DELUXE ZONE MULTISTAGE THERMOSTAT
Table 3. Thermostat Installer Setup Options (Continued).
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.
Press Day until the current day is displayed.
NOTE: Sun=Sunday, Mon=Monday,
Tue=Tuesday, Wed=Wednesday,
Thu=Thursday, Fri=Friday, Sat=Saturday.
M10312
Time SetProgram
System Fan
Run
Program
Hold Temp
Set Current
Day/Time
Set Current
Day/Time
Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
Mon
PM
Set Day/Time
M10313
Time SetProgram
System Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day
Day Heat/Cool
Settings
Daylight
Time Copy
PM
Tue
Set Day/Time
Installer
Setup Number
(Press Time
▲ key to Factory-Setting Other Choices
(Press ▲or ▼key to change) Actual
Select change) Display Description Display Description Setting
Minimum off time
for the
compressor
33 55minute minimum off
time for the compressor 0 thru 4 Minimum number of minutes (0 thru 5) the compressor will
be off between calls for the
compressor
Temperature
range stops in
heating
34 90 Highest setpoint
heating can be set to 40 to 89 Temperature range (1°F increments) heating setpoint
can be set to
Temperature
range stops in
cooling
35 45 Lowest setpoint cooling
can be set to 46 to 99 Temperature range (1°F increments) cooling setpoint
can be set to
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

69-1074 8
T8624D CHRONOTHERM
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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.
NOTE: If the current time is Daylight Savings
Time, press Daylight Time until DST is
displayed.
M10314
Time SetProgram
System Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day
Time
Heat/Cool
Settings
Daylight
Time Copy
AM
Tue
Set Day/Time
M10315
Time SetProgram
System Fan
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time
Daylight
Time
Copy
AM
DST
Tue
Set Day/Time
Press Run Program.
INSTALLER SELF-TEST
Use the Installer Self-Test to check the thermostat
operation. Refer to Table 4 for a list of the available self-
tests.
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.
M10316
Time SetProgram
System Fan
Run
Program
Run
Program
Hold Temp
Set Current
Day/Time Wake Leave Return Sleep
Day Heat/Cool
Settings
Daylight
Time Copy
Auto
System Fan
Wake
Room
AM
DST
Tue
Heat
Fig. 11. Display of all the segments of the LCD.
Aux Ht
Heat
Auto
System Fan
Off Auto
Wake
Mon
Wait
In
Room
Outdoor
%Humid
Auto
Sav
AM
PM
Hold for
Cool Repl Batt
On
Recovery
DST
Cool
TueWedThuFriSatSun
LeaveReturnSleep
M10345
Set Program Set Day/Time Start Time Temporary Setting Enrg
Em Heat
Em Ht
Table 4. Tests Available In The Installer Self-Test.
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.
M10257A
TEST NUMBER
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 Keyboard keys test
70-79 Thermostat information including date
code and software versions are displayed

69-1074
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T8624D CHRONOTHERM
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IV DELUXE ZONE MULTISTAGE THERMOSTAT
Table 5. Installer Self-Test Options.
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.
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.

69-1074 10
T8624D CHRONOTHERM
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IV DELUXE ZONE MULTISTAGE THERMOSTAT
THERMOSTAT INFORMATION
Press the Time ▲▲ key to access the thermostat
information.
M4934
M4932A
M4933A
M10229
M10351
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).
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
outdoor air for a minimum of five minutes before taking
a reading.
TROUBLESHOOTING GUIDE
(Continued)
Symptom Possible Cause Action
Display will not
come on. Thermostat is not being powered. •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.
Thermostat is not fully
connected to wallplate. Verify that thermostat is correctly positioned and securely latched to wallplate.
Temperature
display is
incorrect.
Room temperature display
has been reconfigured. Enter Installer Setup number 37 and reconfigure the display.
Thermostat is configured
for °F or °C display. Enter Installer Setup number 14 and reconfigure the display.
Bad thermostat location. Relocate the thermostat.

69-1074
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T8624D CHRONOTHERM
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IV DELUXE ZONE MULTISTAGE THERMOSTAT
Troubleshooting Guide (Continued).
a Select models.
Symptom Possible Cause Action
Temperature
settings will not
change. (Example:
Cannot set the
The upper or lower
temperature limits were
reached.
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).
heating higher or
the cooling lower.) The setpoint temperature
range stops were
configured.
Check Installer Setup numbers 34 and 35 and reconfigure the
setpoint stops.
Heating will not
come on. No power to 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.
Heating will not
come on. Thermostat minimum off time is activated. Wait up to five minutes for the system to respond.
System selection is not set
to Heat. Set system selection to Heat.
Heating setpoint is below
room temperature. Check heating setpoint. Set heating setpoint to desired temperature.
Cooling will not
come on. No power to the thermostat. •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.
Thermostat minimum off time
is activated. •Wait up to five minutes for the system to respond.
•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.
System on indi-
cator (flame=heat,
snowflake=cool) is
displayed, but no
warm or cool air is
coming from the
registers.
Heating or cooling
equipment is not
operating.
Verify operation of heating or cooling equipment in self-test.
Outdoor tempera-
ture not displayed
a
Option not activated. Enter Installer Setup number 24 and set to 1. Thermostat must
have OT terminals and a C7089B1000 installed.
Outdoor
temperature Outdoor sensor is
connected incorrectly. Refer to C7089B1000 installation instructions and check wiring between the thermostat and sensor.
display is
incorrect
a
Wrong sensor. Replace sensor with C7089B1000 sensor.

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T8624D CHRONOTHERM
®
IV DELUXE ZONE MULTISTAGE THERMOSTAT
69-1074 J.H. 3-97 Printed in Taiwan R.O.C.
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www.honeywell.com/yourhome