Honeywell Chronotherm T8624C Users Manual 68 0134 T8624C,D (5 1 Day |Programming) Chronotherm® III Fuel Saver Thermostats

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T8624C,D (5-1-1 Day
Programming) Chronotherm®
III Fuel Saver Thermostats
The T8624C,D Chronotherm III Programmable Fuel Saver Thermostats provide automatic control of multistage heating/cooling systems and offer users the highest standard of
comfort and convenience available with energy
savings.

■ Different schedules may be selected for weekdays, Saturday and Sunday.
■ Can be programmed in hand (with batteries installed) or on wall to provide up to four temperature settings per day.
■ Large digital clock (liquid crystal display) indicates continuous time, day, current period and
room temperature.
■ Adaptive Intelligent Recovery™ brings room temperature to programmed temperature at programmed time, maximizing comfort and energy
savings.
■ Temperature control program maintains temperature within 1° F of setpoint.
■ Temporary program override available by using:

■ Models available with automatic or manual heat/
cool changeover.
■ Batteries included provide power to maintain
clock and memory during power failures.
■ Switching subbase with wiring terminals included.
■ Powered directly from control transformer, requiring an extra (24V) wire to thermostat.
■ Fan operation switch to select either independent
or direct thermostat control of fan in heating
included on back of select models.

— WARMER and COOLER keys.
— SKIP next period key.
— CHANGE to last period key.

■ HOLD TEMP key provided for indefinite program override (vacation/holiday).
■ Installer self-test and time delay override save
installation time.
■ SYSTEM light-emitting diode (LED) indicates
system is energized.

CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Selection/Application ..................................... 4
Installation ..................................................... 5
Checkout ....................................................... 11
Programming the Thermostat ...................... 14
Operating the Thermostat ............................ 18
Troubleshooting ........................................... 21
Glossary ....................................................... 22

C.H. • 9-93 • ©Honeywell Inc. 1993 • Form Number 68-0134
1

68-0134

T8624C,D
SPECIFICATIONS • ORDERING INFORMATION

Specifications
SETPOINT RANGE: 45° F to 88° F [7° C to 31° C].
CALIBRATION: Self-calibrating thermostat and
thermometer to ±1° F.
SHIPPING TEMPERATURE: -20° F to +120° F [-29° C
to +49° C].
CYCLES PER HOUR ADJUSTMENT:
Heating: First stage of 2-stage heat models—fixed at
3 cph. Second stage of 2-stage heat models or heat
stage of single-stage heat models—factory-set at
6 cph; field-adjustable to 1,3,6 or 9 cph.
Cooling: Factory-set at 3 cph (not field adjustable);
minimum off-time of five minutes.
FINISH: Beige matte with decorative brushed metal
faceplate or Premier White™.
DIMENSIONS: Thermostat (mounted on subbase)—7 in.
[178 mm] long, 5-5/16 in. [135 mm] high, 1-3/4 in.
[44 mm] deep. See Fig. 1 for subbase dimensions.
TYPICAL KEYPAD: See Fig. 2.
ACCESSORIES:
TG586A Locking Cover.
TG512 Versaguard™ Universal Thermostat Guard.

IMPORTANT: The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not exactly match
the listed specifications. Also, this product is tested
under closely controlled conditions, and some minor differences in performance can be expected if
those conditions are changed.
TRADELINE® MODELS
TRADELINE models (see Table 1) are selected and
packaged to provide ease of stocking and handling
and also maximum replacement value.
LIGHT-EMITTING DIODE (LED): SYSTEM LED
lights during thermostat ON cycle.
VOLTAGE RATING: 15 to 30 Vac.
CURRENT RATING: 1.6A maximum total per stage.
OPERATING HUMIDITY RANGE: 5 to 90 percent
relative humidity, noncondensing.
OPERATING AMBIENT TEMPERATURE RANGE:
40° F to 110° F [4° C to 43° C].

TABLE 1—TRADELINE MODELS.
Thermostat
Model
Number

Heat

Stages
Cool

Changeover
Type

System

Switching
Fan

Application

T8624C

Auto

HEAT-AUTO-COOL-OFF

ON-AUTO

Multistage

T8624D

Auto

HEAT-AUTO-COOL-OFF

ON-AUTO

Multistage

T8624D

Manual

HEAT-OFF-COOL

ON-AUTO

Multistage

Ordering Information
When purchasing replacement and modernization products from your TRADELINE® wholesaler or your distributor, refer to the
TRADELINE Catalog or price sheets for complete ordering number, or specify—
1. Model number.
3. System, fan switching desired.
2. Number of heat and cool stages desired.
4. Application.
If you have additional questions, need further information or would like to comment on our products or services, please write or
phone:
1. Your local Honeywell Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Satisfaction
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 (612) 951-1000
In Canada—Honeywell Limited/Honeywell Limitee, 740 Ellesmere Road, Scarborough, Ontario M1P 2V9. International
Sales and Service offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany,
Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

T8624C,D
SPECIFICATIONS

Fig. 1—T8624 Subbase mounting dimensions in in. [mm].
31
32
[50]

13
1
16
[46]
3
4 32
[104]

5
16
[135]
5

5
[83]
16

3
4 [121]
4
7 [179]

M5181A

Fig. 2—Typical thermostat keypad.

AM
SYSTEM

ROOM
WED
HEAT ON

LEAVE

TEMPERATURE
PRESENT
SETTING

RUN
PROGRAM
PERIOD
SET
PRESENT
DAY/TIME

DAY

HOLD
TEMP

SET
HEAT/COOL

TIME

WAKE

LEAVE

SLEEP

RETURN

AHEAD

WARMER

BACK

COOLER

SKIP
NEXT
PERIOD
CHANGE
TO LAST
PERIOD

FAN

HEAT AUTO

COOL

OFF

AUTO

M2998

68-0134

T8624C,D
SELECTION/APPLICATION

Selection/Application
The T8624 Thermostat uses the latest microelectronic design and control technology to provide home
and building owners with the highest level of comfort
available and optimal energy savings in a package that is
easy to use and easy to live with.
The following section is a guide to selection and
application of the best thermostat to meet individual
needs.

— Fan switching; does fan come on automatically
from thermostat on cooling only (typical gas/
oil heating), or on call for cool and heat (typical
electric heat with single speed fan)?
• Existing wiring
— Are there enough conductors to operate the equipment and the thermostat? Can a new cable be
pulled?

PROGRAMMING
Does the thermostat selected accommodate the
customer’s daily schedule, lifestyle or work schedule?
Daily
Temperature
Device
Programming
Selection

IMPORTANT: The T8624 requires an additional conductor to transformer common to provide continuous 24V power for thermostat operation.

T8624C,D

T8621A,C,D

5-1-1 (Mon-Fri,
Sat, Sun)

7-day (each
day different)

T8600,01,02,03* 5-1-1 (Mon-Fri,
Sat, Sun)

SECURITY
Does the thermostat selected provide access to

4 heat and
4 cool

Access

4 heat and
4 cool

Free access to
programming
and adjustment/
override.

Home or
T8624A,C,D
owner-occupied
commercial
building.

Restricted
access to
device.

Public
building.

4 heat and
4 cool

Typical
Application

Device

T8624 with
TG512 Locking
Guard or
TG586A
Locking Cover.

The choices are:

programmming and the override features that will best
suit the application? The choices are:
*Model not currently available to control multistage
equipment.
SINGLE-STAGE HEAT PUMPS

If home/building owner has a single-stage heat pump,
IF NEW CONSTRUCTION APPLICATION, CONone option is to use a T8624C or D (see Fig. 8).
SIDER:
The T8624C is a two-stage heating, one-stage cool• Equipment type (see manufacturer specifications).
ing programmable thermostat. The T8624D is a two—Staging required.
stage heating, two-stage cooling programmable thermo—System switching required.
stat. What both thermostats have in common is separate
—Fan switching required.
W1 and W2 (first and second stage heat) terminals. In
• Control wiring—number of conductors required
both cases, the W1 can be used for changeover in heatto operate equipment and thermostat.
ing.
For single-stage compressor applications (both firstIMPORTANT: The T8624 requires an additional constage heating and first-stage cooling energized through
ductor to transformer common to provide continuthe Y terminal), simply jumper Y1 and W1.
ous 24V power for thermostat operation.
Note that the recovery algorithm of the T8624 may
cause the compressor to cycle on and off during recovIF RETROFIT/REPLACEMENT APPLICATION,
ery.
CONSIDER:
Although the cycle rate for the first stages of heat and
• Equipment requirements.
cool are set for hot water systems, the second stage of the
— Staging (heat stages, cool stages).
T8624 must be adjusted. Turn the cycle rate adjustment
— System switching (manual: HEAT-OFF-COOL;
screws to the hot water setting on both the T8624C and
automatic: HEAT-AUTO-COOL-OFF). EmerD to achieve the cycle rate appropriate for heat pumps.
gency heat for heat pump application not pro-If changeover is utilized in the cooling mode, apply a
vided on T8624.
normally closed relay.
The above application should be used only on singlestage heat pumps.

T8624C,D
INSTALLATION

Installation
or disconnects. Remove any existing wallplate or subbase from wall. To avoid miswiring later, label each
wire color with the letter or number on the wiring terminal as the wire is removed.

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 your old control.
If you have any questions, call Honeywell Inc. at 1800-468-1502.

NEW INSTALLATION
Run cable to a hole at the selected wall location for the
thermostat, and pull about 3 in. [76 mm] of wire through
the opening. Color-coded, 18-gauge thermostat cable with
at least one conductor for each wiring terminal is recommended. Good service practice recommends selecting
cable with one or two more conductors than the immediate application requires.

COMPATIBILITY
The T8624 Thermostats will replace most heating/
cooling system thermostats. As long as ac power is
continuously available to the transformer, the thermostat
will be compatible with any low-volt control system.

MOUNTING SUBBASE
IMPORTANT: Before mounting, set the system switch
to the OFF position.

IMPORTANT: The T8624 requires an additional conductor to transformer common to provide continuous 24V power for thermostat operation.

NOTE: The subbase does not require leveling for proper
operation, but only for appearance.

WHEN INSTALLING THIS PRODUCT…
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check the ratings given on the product to make
sure the product is suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. Allow thermostat to warm to room temperature
before operating.
5. After installation is complete, check out product
operation as provided in these instructions.

Fig. 3—Removing thermostat from subbase.

CAUTION

HEAT AUTO
COOL OFF

FAN
ON

AUTO

Disconnect power supply to prevent electrical
shock or equipment damage.
M 844

LOCATION
Install thermostat and subbase about 5 ft [1.5m] above
the floor in an area with good air circulation at room
temperature.
Do not install thermostat where it may be affected by:
— drafts or dead spots behind doors, in corners or
under cabinets.
— 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.

Remove thermostat from subbase (Fig. 3).
Mount the subbase directly onto the wall with the
screws and anchors included. If drywall construction,
use plastic anchors. Use the subbase as a template, and
with a pencil, mark the two mounting screw positions
(Fig.
4).
Use
3/16 in. bit to drill holes for anchors. Gently tap anchors
into holes until they are flush with the wall surface.
Thread wires through the center opening of the subbase.
Then mount the subbase using the two screws provided.
Gently tighten the screws, level the top surface of the
subbase, and securely tighten the screws.

REPLACING AN EXISTING THERMOSTAT
Turn off thermostat power at furnace or boiler. A twotransformer system may require turning off two switches

68-0134

T8624C,D
INSTALLATION

Fig. 5—Restrict wiring to recessed area
surrounding terminals.

Fig. 4—Mounting subbase on wall.

FOR STRAIGHT
INSERTION –
STRIP 5/16 in. [8 mm]

WALL
WIRES THROUGH
WALL OPENING

FOR WRAPAROUND –
STRIP 7/16 in. [11 mm]

RESTRICT
WIRING TO
THIS AREA

FRONT VIEW OF
TERMINAL AREA

WALL
ANCHORS
(2)

WIRING TO BE BELOW
THIS SURFACE

MOUNTING
HOLES

SUBBASE

MOUNTING
SCREWS (2)

TOP SURFACE
OF SUBBASE

CROSS-SECTIONAL VIEW OF
TERMINAL AREA

M846

WIRING
All wiring must comply with local electrical codes
and ordinances.
Disconnect power before wiring to prevent electrical
shock or equipment damage.
The shape of the terminal barrier permits insertion of
straight or conventional wraparound wiring connections.
Either method is acceptable.
Push excess wire back into the hole, and plug the hole
with nonhardening caulk, putty or insulation to prevent
drafts from affecting thermostat operation.

M 847

In multistage heat systems, the cycle rate adjustment
applies to the highest stage of heat only. Screws should
be backed out about one-half to one turn, or be turned in
until tight. See Fig. 9.
TIME/TEMPERATURE CONVERSION
(SOME MODELS)
The display readout may be converted between 12
and 24 hour clock or °C and °F using screws 2A and 2B
as indicated in Fig. 9.
FAN OPERATION OPTION SWITCH
(SELECT MODELS ONLY)
Select models include a fan operation option switch
on the subbase that is visible before the thermostat is
mounted on the subbase. The switch should be in electric
heat position for electric heating systems that do not
have independent fan control.

NOTE: Restrict wiring to the recessed area surrounding
the terminals (Fig. 5) to assure thermostat/subbase
contact.
Refer to Figs. 6-8 for typical hookups of subbase and
thermostat.
ADJUSTING CYCLE RATE
To customize the thermostat cycling performance to
various types of heating equipment, cycle rate adjustment screws are provided on the back of the thermostat
to provide optimum room temperature control.

INSTALLING BATTERIES
Three AAA alkaline batteries are included to provide
backup to prevent program loss in case of power outage.
Install batteries in back of thermostat as shown in Fig.
10.
Without battery backup, the program will remain
about 30 seconds in event of power loss.

NOTE: Most applications will not require a change in
cycle rate.

IMPORTANT: When batteries are first installed, the
display will flash 1:00 PM and 32 °. The temperature will stay at 32° F until the thermostat is
powered from the system wiring.

The room air temperature will normally vary slightly
from the comfort temperature setting with the cycling of
the furnace or air conditioner.
The heating cycle rate of this thermostat is factory-set
for gas/oil warm air heating. The cooling cycle rate is
factory-set and cannot be adjusted. The heating cycle
rate can be adjusted by turning one or both cycle rate
adjustment screws located on the back of the thermostat.

When the batteries are low, the display will flash
REPL BAT. Homeowner will have 20-30 seconds to
install new batteries after removing old batteries from
back of thermostat. After 20-30 seconds, it will be necessary to reprogram. REPL BAT indication will disap-

T8624C,D
INSTALLATION

Fig. 6—T8624C 2-stage heat/1-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON
fan switching.

HEATING
TRANSFORMER

HIGH
LIMIT

1
L1
(HOT)

L2
3

POWER
SUPPLY

C
HIGH
LIMIT

HEAT 1

HEAT RELAY 1
W1

HEAT RELAY 2

HEAT 2
W2
SYSTEM
SWITCH
HEAT
THERMOSTAT
LOGIC CIRCUIT

AUTO
COOL
OFF

COOLING
CONTACTOR

COOL
Y1
FAN
SWITCH

SUBBASE
LOGIC/
CONTROL
CIRCUIT

FAN RELAY
AUTO
G
ON
2
L1
(HOT)

L2
COOLING
TRANSFORMER

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

FOR SINGLE TRANSFORMER SYSTEM JUMPER R AND RC.

NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C FOR
THERMOSTAT OPERATION.
DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION.
M5233

68-0134

T8624C,D
INSTALLATION

Fig. 7—T8624D 2-stage heat/2-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON
fan switching.

HIGH
LIMIT

POWER
SUPPLY

HEATING
TRANSFORMER

C
HIGH
LIMIT

HEAT 1

HEAT RELAY 1

SYSTEM
SWITCH

W1
HEAT 2

HEAT
THERMOSTAT
LOGIC
CIRCUIT

L1
(HOT)
L2
1

HEAT RELAY 2
W2

AUTO
COOL
OFF

COOL 2

COOLING
CONTACTOR 2

Y2
SUBBASE
LOGIC/
CONTROL
CIRCUIT

Y1
FAN
SWITCH

COOL 1

COOLING
CONTACTOR 1

AUTO
G
ON
1

FOR SINGLE TRANSFORMER SYSTEM, JUMPER R AND RC.

NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN
R AND C FOR THERMOSTAT OPERATION.

4
5

FAN RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

L1
(HOT)
L2
1
COOLING
TRANSFORMER

DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION.
AVAILABLE ON T8624D MODELS ONLY.

M3765

T8624C,D
INSTALLATION

Fig. 8—T8624D 2-stage heat/2-stage cool thermostat with HEAT-OFF-COOL system and AUTO-ON fan
switching; auto fan on heat and cool; convertible to auto fan on cool only.

L1
(HOT)

1
HEATING
TRANSFORMER
R

4
POWER
SUPPLY

C
HIGH
LIMIT
FAN
OPERATION
SWITCH

HIGH
LIMIT
W1

3
ELECTRIC
NON-ELECTRIC
2

STAGE 1
HEAT RELAY

HEAT 1
W2

SYSTEM
SWITCH

HEAT 2

STAGE 2
HEAT RELAY

HEAT
B

THERMOSTAT
LOGIC CIRCUIT

OFF
HEATING DAMPER OR
CHANGEOVER RELAY

COOL

COOLING DAMPER OR
CHANGEOVER RELAY
O
STAGE 2
COOLING RELAY
Y2
COOL 1

COOL 2
STAGE 1
COOLING RELAY

SUBBASE
LOGIC/
CONTROL
CIRCUIT

Y1
FAN
SWITCH
AUTO

FAN RELAY
G

ON
3
RC
COOLING
TRANSFORMER
1
L1
L2
(HOT)
1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.

FOR GAS OR OIL APPLICATIONS OR ELECTRIC HEAT APPLICATIONS
WHERE THE FAN OPERATION IS CONTROLLED INDEPENDENTLY OF
THE THERMOSTAT (AUTO FAN OPERATES WITH Y1 ONLY), TWO
TRANSFORMERS MAY BE USED. SET SWITCH TO NONELECTRIC
POSITION.

FOR ELECTRIC HEAT APPLICATIONS (AUTO FAN OPERATES WITH W1
AND Y1), USE ONLY ONE TRANSFORMER; JUMPER R AND RC. SET
SWITCH TO ELECTRIC POSITION.

NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C FOR
THERMOSTAT OPERATION.

DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION.

M1016D

68-0134

T8624C,D
INSTALLATION

After replacing the batteries, reprogramming will be necessary.

Fig. 9—Cycle rate adjustment.

1A 1B

2A 2B

SYSTEM

OUT 1/2
GRAVITY
AIR/WATER TO 1 TURN
HOT
WATER
GAS/OIL
WARM AIR
ELECTRIC
WARM AIR

OUT 1/2
TO 1 TURN

TIME/TEMP
DISPLAY

OUT 1/2
TO 1 TURN

24 HR

12 HR

IN
IN
(FACTORY SETTING)
IN

CYCLES
PER HOUR

OUT 1/2
TO 1 TURN

BATTERY PLACEMENT
(NOTE CORRECT PLUS
AND MINUS DIRECTION) M 372A

IN
OUT 1/2
TO 1 TURN

SCREWS 2A, 2B AVAILABLE ON SOME MODELS ONLY.

If the display goes off when power is lost, either the
backup batteries need to be replaced or are not installed.
When power is restored, the display will flash 1:00 PM
as a reminder to reprogram.

IN
OUT 1/2
TO 1 TURN

M311A

MOUNTING THE THERMOSTAT
With system switch set to OFF, hang the thermostat
on the tabs at the top of the subbase (Fig. 11A). Swing
down and press on lower edge until thermostat snaps in
place (Fig. 11B). Open cover and tighten the captive
mounting screws (Fig. 11C).

pear when thermostat is mounted back on the subbase.
IMPORTANT: For proper thermostat operation, always replace dead batteries with new alkaline
batteries. We recommend Energizer® batteries.

SETTING DAY AND TIME
Restore 24V power to the thermostat. When power is
applied to the thermostat, the display will read 1:00 PM
and room temperature. It will go off for a few seconds,
then begin to flash on and off. Set present day and time.

If batteries are completely dead, the display will go
blank when the thermostat is removed from the subbase.
Fig. 10—Battery placement.

Press

POWER OUTAGES
Backup batteries will hold the programming and keep
the display on during most power outages. Once the
power is restored, the system will resume normal operation.

SET
PRESENT
DAY/TIME

Press DAY
to set the current day. Each press of
the DAY key advances the display one day.
Press TIME

AHEAD

BACK

to set the current time.

If the display will not come on:
— Check the mounting of the thermostat to the subbase. If loose or misaligned, remove thermostat
and reinstall on the subbase, making sure it is
firmly attached.
— Check to see that heat or cool system power is on.
— Check voltage between R and C; it should be 24 to
30 Vac.

T8624C,D
INSTALLATION • CHECKOUT

Fig. 11—Mounting thermostat on subbase.

B.
PM
MON
RETURN

SYSTEM

HEAT ON

FAN

AUTO
ON AUTO

HEAT

AUTO COOL

OFF

SYSTEM

PM
MON
RETURN

HEAT ON

TEMPERATURE
PRESENT
SETTING

RUN
PROGRAM
PERIOD
SET
PRESENT
DAY/TIME

DAY

HOLD
TEMP

SET
HEAT/COOL

WAKE

LEAVE

SLEEP

RETURN

TIME

AHEAD

WARMER

BACK

COOLER

SKIP
NEXT
PERIOD
CHANGE
TO LAST
PERIOD

M3764

Checkout
Move the system switch to COOL and the fan switch
to AUTO. Press COOLER key until the setting is about
10° F [6° C] below room temperature. The cooling
equipment and fan should start (both stages if multistage). Press WARMER key until the setting is about
10° F [6° C] above room temperature. The cooling
equipment and fan equipment should stop.

HEATING
Move the system switch to HEAT and the fan switch
to AUTO. Press WARMER key until the setting is about
10° F [6° C] above room temperature. Heating should
start (both stages if multistage), and the fan should run
(may be a short delay on forced air systems). Press
COOLER key until the setting is about 10° F [6° C]
below room temperature. The heating equipment should
shut off, followed by the fan.

NOTE: On an AUTO changeover thermostat, the heating temperature must be set at least 3° F [2° C] below
the cooling temperature, or display will flash.

NOTE: On an AUTO changeover thermostat, the cooling temperature must be set at least 3° F [2° C] above
the heating temperature, or display will flash.

FAN
Move the system switch to OFF, and the fan switch to
ON. The fan should run continuously. When the fan
switch is in the AUTO position, the fan operates directly
with the thermostat call for cooling and also with the

COOLING

CAUTION
Do not operate cooling if outdoor temperature
is below 50° F [10° C]. Refer to manufacturer
recommendations.

NOTE: When cooling setting is changed, thermostat
will wait up to five minutes before turning on the
cooling equipment. This delay is to protect the compressor.

68-0134

T8624C,D
CHECKOUT
System
Switch
Position

Press
This
Key

OFF

Look For This Response
Key
Down

Key Released

Blank

BACK

Blank

LEAVE

Blank

See note AA

Blank

Microprocessor
mask no. and
revision no.

Blank

1st stage heating
and SYSTEM
LED on.

2nd stage heating
also on.

2nd stage heating
off.

1st stage heating
and SYSTEM
LED off.

WARMER

COOLER

AHEAD

AM
PM

REPL
SET
PT

BAT

SUN MON TUE WED THU FRI SAT COOL ON HEAT ON

RETURN

WAKE LEAVE RETURN SLEEP TEMPORARY

M410C

(CHECK
EACH
POSITION)
OFF

WAKE

SLEEP

DAY

RUN
PROGRAM
SET
HEAT/COOL

System
Switch
Position
OFF

Key
Down

CHANGE

Blank

1st stage cooling,
fan and SYSTEM
LED on.
2nd stage cooling
also on.

TO LAST
PERIOD

SKIP
NEXT
PERIOD

PRESENT
SETTING

COOL or
AUTO
(with fan in
AUTO)

Look For This Response

Press
This
Key

PRESENT
SETTING

SET
PRESENT
DAY/TIME

Key Released

HEAT or
AUTO
1

SET
PRESENT
DAY/TIME

2nd stage cooling
off.

1st stage cooling,
fan and SYSTEM
LED off.

SET
PRESENT
DAY/TIME

NOTE: If single-stage heating system, press key twice
instead of four times; once to turn on heating and
SYSTEM LED, second time to turn off.
OFF

HOLD
TEMP

RUN
PROGRAM

NOTE: If single-stage cooling system, press key twice
instead of four times; once to turn on cooling, fan
and SYSTEM LED, second time to turn off.

Blank

Normal operating
display.

END SELF-TEST

(continued)

T8624C,D
CHECKOUT

Stages of

Second
Digit

Heat

Cool

First Digit

Cycle Rate Setting (cph at 50% on
time for stage 1 on 1-heat models,
stage 2 on 2-heat models)

M5734

Third
Digit

Manual or Auto
Changeover

System Switch
Position

Manual

HEAT or OFF

Auto

HEAT or OFF

Auto

AUTO

Manual

COOL

Auto

COOL

Fourth
Digit

Degrees

Clock
(hrs)

System Switch
Position

COOL, AUTO
or OFF

HEAT

COOL, AUTO
or OFF

HEAT

68-0134

T8624C,D
PROGRAMMING THE THERMOSTAT

Programming the Thermostat
IMPORTANT: With Adaptive Intelligent Recovery™,
program the times for when the homeowner wants
the home comfortable. The thermostat will decide
how early to begin the temperature changes.

STEP 1
SET THE CURRENT DAY AND
TIME

NOTE: Some models will show 32° F instead of the
current temperature, indicating the thermostat is operating on backup batteries until the thermostat is
mounted on the wallplate and the system is powered.

definitions of unfamiliar
words.

SET
PRESENT
DAY/TIME

PM
MON

M5015

This thermostat can be programmed either
on the wall or in hand. SEE PAGE 5 TO
FIND OUT HOW TO REMOVE THE
THERMOSTAT FROM THE SUBBASE.
Always press the keys with fingertip or
similar blunt tool. Sharp instruments like a
pen or pencil point can damage the keyboard.

DAY

Press and release. The display
shows 1:00 PM MON.

AHEAD

Press and hold until the current
day appears in the display.

PM
TUE

M5016
PM
TUE

M5017

Press and hold until the current
time appears in the display. Be
sure AM or PM appears as desired.

BACK

NOTE: Check the glossary, page 22, for

STEP 2
SET THE PROGRAM SCHEDULE
AND HEATING TEMPERATURES
Before Beginning…
The schedule form on page 22 provides the
homeowner an opportunity to plan the
schedule.
Now…
Start by programming the WAKE time
and temperature for weekdays.
The thermostat requires a program for
WAKE. You can program LEAVE, RETURN and SLEEP or not, as desired.

Press and release. Note that
the display shows WAKE and
the preprogrammed time and
temperature.

WAKE

If the display reads COOL,
press and release to switch to
HEAT.

SET
HEAT/COOL

If display reads SAT or SUN,
press and hold until MON
TUE WED THU FRI appears.

DAY

Press and hold until the display shows the desired starting time.

AHEAD

AM
MON TUE WED THU FRI

M5018

AM
MON TUE WED THU FRI

Press and hold until the display shows the desired temperature.

COOLER

SET
PT
ON HEAT

WAKE

M5018

AM
MON TUE WED THU FRI

SET
PT
ON HEAT

WAKE

M5018

AM
MON TUE WED THU FRI

SET
PT
ON HEAT

WAKE

M5019

BACK

WARMER

SET
PT
ON HEAT

WAKE

AM
MON TUE WED THU FRI

SET
PT
ON HEAT

WAKE

M5020

If the display starts to blink while holding down TEMPERATURE WARMER or COOLER, the setting limit
has been reached. If the thermostat can switch automatically between heating and cooling, the heating temperature must be at least three degrees below the air conditioning temperature. For example, if the cooling setting

T8624C,D
PROGRAMMING THE THERMOSTAT
is 75° F, the maximum heating setting is
72° F.
Program the LEAVE time and temperature, if desired.
NOTE: The LEAVE, RETURN or SLEEP
program may be canceled by holding
down the period key until the time and

temperature disappear from
the display.

LEAVE

SET
PT
MON TUE WED THU FRI

ON HEAT

LEAVE

M5021

Press and release. The display
shows LEAVE, but no time
or temperature.

AHEAD

AM
MON TUE WED THU FRI

SET
PT
ON HEAT

LEAVE

M5022

Press and hold until the display shows the desired starting time.

BACK

WARMER

SET
PT

MON TUE WED THU FRI

ON HEAT

LEAVE

M5023

COOLER

Press and hold until the display shows the
desired temperature.

Press and release. The display
shows RETURN, but no time
or temperature.

RETURN

SET
PT
MON TUE WED THU FRI

ON HEAT

RETURN

M5024

Program the RETURN time and temperature, if desired.

Press and hold until the display shows the desired starting time.

AHEAD

ON HEAT

RETURN

M5025

BACK

COOLER

SET
PT

Press and hold until the display shows the desired temperature.

WARMER

SET
PT

PM
MON TUE WED THU FRI

MON TUE WED THU FRI

ON HEAT

RETURN

M5026

Program the SLEEP time and temperature, if desired.
SLEEP

Press and release. The display shows SLEEP and the
pre-programmed time and
temperature.

SET
PT

PM
MON TUE WED THU FRI

ON HEAT

SLEEP

M5027

SET
PT

AHEAD

MON TUE WED THU FRI

Press and hold until the display shows the desired starting time.

BACK

ON HEAT

SLEEP

M5060

SET
PT

WARMER

MON TUE WED THU FRI

ON HEAT

SLEEP

M5028

COOLER

Press and hold until the display shows the
desired temperature.

Set the SATURDAY schedule. Use the same procedure
as for weekdays.

DAY

WAKE

Press and release until SAT appears on the display.

SLEEP

SET
PT

PM
SAT

ON HEAT

SLEEP

M5029

LEAVE

RETURN

Press WAKE, LEAVE, RETURN or SLEEP to select the
time period.

AHEAD

BACK

WARMER

COOLER

Use the AHEAD/BACK keys
to set the time and the WARMER/COOLER
keys to set the temperature.

Set the SUNDAY schedule.
Use the same procedure as for
weekdays.

DAY

SET
PT

PM
SUN

ON HEAT
SLEEP

M5030

68-0134

T8624C,D
PROGRAMMING THE THERMOSTAT

WAKE

Press and hold until SUN appears on the display.

LEAVE

RETURN

SLEEP

Press WAKE, LEAVE, RETURN or SLEEP to select
the time period.

AHEAD

BACK

WARMER

COOLER

Use the AHEAD/BACK keys
to set the time and the
WARMER/COOLER keys to set the temperature.
This completes setting the program schedule and heating temperatures. To set air conditioning, go to Step 3.

If cooling temperatures are not being programmed, skip Step 3 and press the RUN
PROGRAM key.
STEP 3
SET THE COOLING TEMPERATURES

WAKE

First program the WAKE temperature for weekdays.

ON HEAT

WAKE

M5031

Press and release. The display shows WAKE and the
time and temperature proAM
grammed for heating.

SET

SET
PT

HEAT/COOL

The program times are the same for both
heating and cooling. Only the cooling temperatures need to be programmed if the
thermostat has already been programmed
for heating. To set times as the cooling
temperatures are programmed, use the TIME
AHEAD and BACK keys as described in
Step 2. If the times are changed for cooling,
they are also being changed for heating.

SET
PT

SUN

COOL

WAKE

Press and release so COOL
shows on the display, along
with the preprogrammed cooling temperature.

DAY

M5032

AM
MON TUE WED THU FRI

SET
PT
COOL

WAKE

If display reads SAT or SUN,
press and hold until MON
TUE WED THU FRI appears.

WARMER

M5033

AM
MON TUE WED THU FRI

SET
PT
COOL

WAKE

COOLER

mum
cooling
setting
is
73° F. If a lower cooling temperature is

M5034

Press and hold until the display shows the desired temperature.

If the display blinks while holding down TEMPERATURE WARMER or COOLER, the setting limit has
been reached. If the thermostat can switch automatically
between heating and cooling, the cooling temperature
must be at least three degrees higher than the corresponding heating temperature. For example, if the heating setting is 70° F, the minidesired, the heating temperaAM
ture first must be lowered accordingly.
M5035
SET
PT

LEAVE

MON TUE WED THU FRI

COOL

LEAVE

Program the LEAVE temperature, if desired.
WARMER

AM
MON TUE WED THU FRI

Press and release. The display

SET
PT
COOL

LEAVE

M5036

COOLER

shows LEAVE, the time programmed for
heating,
and
78° F.

RETURN

Press and hold until the display shows the desired temperature.

SET
PT

PM
MON TUE WED THU FRI

COOL

RETURN

M5037

T8624C,D
PROGRAMMING THE THERMOSTAT
Program the RETURN temperature,
if
desired.

WARMER

SET
PT

PM
MON TUE WED THU FRI

COOL

RETURN

M5038

COOLER

Press and release. The display shows RETURN, the time programmed for heating,

a
78° F.

SLEEP

SET
PT

PM
MON TUE WED THU FRI

COOL

SLEEP

M5039

Press and hold until the
display shows the desired temperature.

WARMER

SET
PT

PM
MON TUE WED THU FRI

COOL

SLEEP

M5040

Program the SLEEP tempera-

COOLER

ture, if desired.

SET
PT

DAY

SAT COOL

Press and hold until the display shows the desired temperature.

Press and release.
WAKE

Set the cooling temperatures
for the SATURDAY schedule.
Use the same procedure as for
weekdays.

SLEEP

M5041

LEAVE

RETURN

WARMER

Press and hold until SAT apCOOLER

pears on the display.

to select the time period.
DAY

SET
PT

PM
SUN

COOL
SLEEP

M5042

Press WAKE, LEAVE, RETURN or SLEEP
WAKE

Use the WARMER/COOLER
keys to set the temperature.

SLEEP

Set the cooling temperatures for
the SUNDAY schedule. Use the
same procedure as for weekdays.

LEAVE

RETURN

WARMER

COOLER

Press and hold until SUN appears on the display.

RUN
PROGRAM

Press WAKE, LEAVE, RETURN or SLEEP to select the
time period.

SET
PT

TUE
LEAVE

M5043

68-0134

T8624C,D
PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT

SET THE SYSTEM AND FAN
SWITCHES ON THE SUBBASE.

Use the WARMER/COOLER keys to set the temperature.
You have completed programming the cooling temperatures.

FAN

Depending on thermostat model,
some of the switch positions shown
may not be available on the thermostat. Note the positions provided
on the subbase, then set the
switch(es) as desired.

Press and release to start the program.
Go to Step 4.
STEP 4

AUTO

FAN

AUTO
M3763

First set the fan switch.
FAN ON: The fan runs continuously. Use for improved
air circulation during special occasions or for more efficient
electronic
air
FAN AUTO: Normal setting
for most homes. The fan goes
on and off with the air condiHEAT
AUTO COOL OFF
tioner in summer. In winter, the
fan
on
most
systems starts a few minutes
after the furnace comes on. It
HEAT AUTO COOL OFF
stops a few minutes after the
furnace goes off. The fan starts
and stops with the furnace in
some electric heat systems and
with the compressor in heat
HEAT AUTO COOL OFF
pump systems.

cleaning.

Then set the system switch.
HEAT: The thermostat controls
your heating system.

HEAT

AUTO

COOL

OFF

M3762

AUTO (select models only): The thermostat controls
either your heating or cooling system, depending on
room temperature.

OFF: Both the heating and cooling systems are off.
This completes the programming of the thermostat.

COOL: The thermostat
your cooling system.
Operating
thecontrols
Thermostat

If the thermostat is removed from the wall to program, replace it following the procedure on page 5.
TEMPORARILY CHANGING THE PROGRAM
These features allow the program to be customized for
those times when someone comes home early, or stays
up late, or plans to be out for the evening.
To keep the current temperature through the
next program period:

To go back to the temperature of the previous program period:

Press and release. The name
of the period to be skipped
will flash in the display until
the next regularly scheduled
period starts.

SKIP
NEXT
PERIOD

Press and release. The display will show the name of
the previous period and flash
TEMPORARY until the next
regularly scheduled period starts.

CHANGE
TO LAST
PERIOD

PM
TUE
LEAVE RETURN

M5044

PM
TUE
WAKE

TEMPORARY

M5045

T8624C,D
OPERATING THE THERMOSTAT
To temporarily raise or lower the temperature for the current period only:

Press and hold until the desired temperature is reached.
The display will flash TEMPORARY until the next programmed time period starts.

WARMER

COOLER

ON HEAT
TEMPORARY

M5046

With the system switch at the
AUTO position, press and
hold down the key to alternate between heating and cooling temperature settings for
temporary override.

PRESENT
SETTING

Press and release to cancel
any of the temporary settings.

RUN
PROGRAM

PM
TUE
LEAVE

M5047

PERMANENTLY CHANGING THE
PROGRAM
If the schedule changes or a different temperature is desired, any setting can be updated without affecting other program settings.

WAKE

Press and release the desired
period key.
SLEEP

RETURN

DAY

Press and hold until the desired
day schedule shows on the display.

AHEAD

Press and hold the Time or Temperature keys until the display
shows the desired new program.

BACK

RUN
PROGRAM

MANUALLY OPERATING THE
THERMOSTAT

LEAVE

WARMER

COOLER

Press and release to return to
normal operation.

HOLD
TEMP

SET
PT

Press and release.

ON HEAT

M5048

This feature is particularly useful when on
vacation or other extended absences. It does
not cancel the program.

SET
PT

Press and hold to change the
temperature setting. After a
few seconds, the display will
show the current temperature.

WARMER

COOLER

PRESENT
SETTING

ON HEAT

M5049

SET
PT

Press and release to check the
temperature setting.

ON HEAT

M5050

Press and hold down to alternate between heating and
cooling temperature settings.
RUN
PROGRAM

Press and release to cancel
hold.

PM
TUE
LEAVE

M5051

68-0134

T8624C,D
OPERATING THE THERMOSTAT
NOTE: Moving the system switch also cancels hold.
CANCELING THE PROGRAM
SETTINGS

day and Sunday settings are
canceled separately.

SLEEP

M5052
Press and hold the desired period key until the time and temperature clear from the
display (about three seconds).

RETURN

RUN
PROGRAM

PM
MON

Press and release to return to

RETURN

M5053

Check all the stored settings without affecting the permanent program.

normal operation.
WAKE

CHECKING THE PROGRAM TIMES
AND TEMPERATURES

ON HEAT

LEAVE

The thermostat requires time and temperature settings in the WAKE period, but any of
the others can be canceled. Weekday, Satur-

MON TUE WED THU FRI

SET
PT

PM
MON TUE WED THU FRI

ON HEAT

Press and release the desired
period key. The start time and
temperature setting will appear on the display.
SLEEP

SLEEP

M5054

LEAVE

RETURN

Press and release to display
the next daily time and temperature for that period.

DAY

normal operation.

RUN
PROGRAM

Press and release to return to

SET
PT

PM
SAT

ON HEAT

SLEEP

M5055

PM
MON
RETURN

M5056

CHECKING THE CURRENT
TEMPERATURE SETTING
Press a single key to compare current room
temperature to the current temperature setting at any time.

PRESENT
SETTING

Press and release. The display will show the current
temperature setting for several seconds, then revert to the room temperature.

SET
PT

ON HEAT

M5057

To check the heating and cooling settings with the system switch at the AUTO position, press and hold down
to alternate between the heating and cooling settings.

PRESENT
SETTING

During recovery from energy savings, the setting displayed will not match the programmed setting. This is
because the thermostat gradually changes the temperature setting during recovery to provide most efficient use
of the heating or cooling equipment.

T8624C,D
TROUBLESHOOTING
SYMPTOM

POSSIBLE CAUSE

ACTION

ROOM TEMPERATURE DISPLAY
IS 32˚F.

NO ac POWER TO THERMOSTAT

CHECK POWER TO FURNACE OR AIR CONDITIONER.
–ON-OFF SWITCH
–FUSE OR CIRCUIT BREAKER
–LOOSE 24V CONNECTION
–AT THERMOSTAT
–AT FURNACE /AIR CONDITIONER
–INCORRECT WIRING
–CHECK WIRING DIAGRAM

FURNACE OR AIR CONDITIONER
WON'T OPERATE.

NO ac POWER TO THERMOSTAT

THERMOSTAT INOPERATIVE

CONDUCT SELF-TEST; SEE CHECKOUT.

PRESENT SETTING TOO LOW/HIGH

ADJUST TEMPERATURE BY PUSHING WARMER/
COOLER KEYS.

SYSTEM SWITCH ON THERMOSTAT
IN WRONG POSITION.

RESET THERMOSTAT SYSTEM SWITCH.

MINIMUM-OFF TIMES IN THERMOSTAT
IN OPERATION ON COOLING

WAIT 5 -10 MIN. OR USE SELF-TEST IN THERMOSTAT.
SEE CHECKOUT.

INCORRECT WIRING

CHECK CIRCUIT DIAGRAM.

FURNACE OR AIR CONDITIONER
INOPERATIVE

CONSULT FURNACE OR AIR CONDITIONER
INSTRUCTIONS.

PARTIAL DISPLAY

INOPERATIVE THERMOSTAT

REPLACE THERMOSTAT.

NO DISPLAY

NO POWER TO THERMOSTAT

CHECK THAT HEAT OR COOL SYSTEM POWER IS ON.

THERMOSTAT MOUNTED
INCORRECTLY ON BASE.

SEE INSTALLATION INSTRUCTIONS FOR CORRECT
MOUNTING.

THERMOSTAT IS IN RECOVERY
MODE.

• NORMAL OPERATION THERMOSTAT TURNS ON
HEATING/COOLING EARLY TO MEET TEMPERATURE
SETTING AT PROGRAMMED TIMES.
• RECOVERY CAN BE ENDED BY PUSHING WARMER/
COOLER KEYS.

PRESENT SETTING APPEARS
INACCURATE.

CANNOT TEMPORARILY OVERRIDE
BOTH HEATING AND COOLING
SETTINGS IN AUTO MODE.

NOT USING PRESENT SETTING KEY.

PRESS AND HOLD DOWN PRESENT SETTING KEY TO
ALTERNATE BETWEEN HEATING AND COOLING SETTINGS.

THERMOSTAT TEMPERATURE NEEDS
TO BE ADJUSTED ON A REGULAR
BASIS.

WARMER/COOLER KEYS BEING
USED TO ADJUST TEMPERATURE

REPROGRAM THERMOSTAT TO MAKE PERMANENT
CHANGE IN PROGRAM. WARMER/COOLER KEYS ARE
TEMPORARY UNLESS PERIOD KEY IS PRESSED FIRST.

PROGRAM IS LOST DUE TO POWER
OUTAGE OR DISPLAY GOES BLANK
WHEN POWER IS TURNED OFF.

BATTERIES ARE INCORRECTLY
INSTALLED.

REMOVE AND REPLACE PER MARKINGS ON THERMOSTAT.

BATTERIES ARE DEAD.

REPLACE BATTERIES.

IMPROPER PROGRAM SEQUENCE

CHECK PROGRAMMING INSTRUCTIONS FOR CORRECT
PROGRAM SEQUENCE.

AUTOMATIC THERMOSTAT HEATING
OR COOLING TEMPERATURE CAN
NOT BE SET CLOSER THAN 3O F.

SET HEATING AND COOLING TEMPERATURES 3O F OR
MORE APART.

PROGRAMMING HAS BEEN LOST
BECAUSE OF A POWER OUTAGE.

REPROGRAM ACCORDING PROGRAMMING INSTRUCTIONS
(MAKE SURE BATTERIES ARE INSTALLED).

DISPLAY FLASHES WHILE
PROGRAMMING.

DISPLAY FLASHES DURING
OPERATION.

M5234A

68-0134

T8624C,D
GLOSSARY

Recovery
The time when the thermostat operates the heating or
air conditioning equipment to return the home from the
energy saving temperature to the comfort temperature.
The thermostat starts the recovery period early so the
home will be at the comfort setting by the time the
homeowner has chosen.

Troubleshooting

Saturday program schedule
The schedule of WAKE, LEAVE, RETURN and
SLEEP period start times and temperatures programmed
to run on Saturdays.

Glossary

Setback
Reducing the temperature in the home for a set period
in heating for energy savings. The lower temperature is
the energy saving temperature.

Comfort temperature
The temperature desired when active and occupying
the home.
Energy-saving temperature
The lower (heating) or higher (cooling) temperature
that allows savings on heating and cooling costs when
asleep or away. Also called the setback (heating) or
Temperature
Start
Period
Time
Heating Cooling

WAKE
LEAVE
RETURN
SLEEP

6:00 AM

70° F

Setup
Raising the temperature in the home for a set period
in cooling for energy savings. The higher temperature is
the energy saving temperature.
Setpoint
The thermostat temperature setting the homeowner
selects. The thermostat turns the heating or cooling
equipment on and off to maintain this temperature at the
thermostat location until another temperature setting
(setpoint) goes into effect.

78° F

——— No program ————
——— No program ————
10:00 PM

60° F

78° F

Sunday program schedule
The schedule of WAKE, LEAVE, RETURN and
SLEEP period start times and temperatures programmed
to run on Sundays.

setup (cooling) temperature.
Period key
One of the four keys—WAKE, LEAVE, RETURN or
SLEEP—to check or program the start time and
temperatue for a time period.

SYSTEM light
This light glows whenever the thermostat is calling
for heating or air conditioning.

Preprogrammed schedule
This is the schedule programmed into the thermostat
at the factory. It sets a night program that provides
energy savings when homeowner sets no program, or if
personal program is lost for any reason. The program,
which is the same for all days of the week, is:

Time period
One of four program periods: WAKE, LEAVE, RETURN and SLEEP available with the thermostat. One
period begins when the previous program period ends:
WAKE—The time period that the house is at a comfortable temperature while the family gets up and gets
Program
ready to leave for work or school. This is the only
The times and temperatures homeowner sets to define
period that must contain a time and temperature.
the comfort and energy saving periods for each day
LEAVE—The time period that the temperature can
schedule.
home.
be set back (winter) or set up (summer) for energy
RETURN—The time period that the house is at a comfortable savings
temperature
for family
activities
the evening
because
the family
is in
usually
away before
from
bedtime.
SLEEP—The time period that the temperature can be set back (winter) or set up (summer) for energy savings
because the family is sleeping. It can be set to start at the family’s normal bedtime. Often the SLEEP program is set
only for the heating season so family members can sleep cool in the cooling season.
Weekday program schedule
The schedule of WAKE, LEAVE, RETURN and SLEEP period start times and temperatures programmed to run
Monday through Friday.

68-0134

Home and Building Control
Honeywell Inc.
1985 Douglas Drive North
Golden Valley, MN 55422

Printed in U.S.A.

Home and Building Control
Honeywell Limited—Honeywell Limitée
740 Ellesmere Road
Scarborough, Ontario
M1P 2V9

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Title                           : 68-0134 - T8624C,D (5-1-1 Day |Programming) Chronotherm® III Fuel Saver Thermostats
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Subject                         : Product Data
Author                          : Home and Building Control

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Honeywell Chronotherm T8624C Users Manual 68 0134 T8624C,D (5 1 Day |Programming) Chronotherm® III Fuel Saver Thermostats

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