Honeywell t8624d User Manual download pdf

T8624D Chronotherm

IV Deluxe

Programmable Thermostat

PRODUCT DATA

® U.S. Registered Trademark

APPLICATION

The T8624D Chronotherm® IV Deluxe Programmable

Thermostat provides electronic control of 24 Vac multistage

heating and cooling systems.

FEATURES

• Full seven-day program capability; different schedules

and temperature setpoints may be selected for

everyday to match the homeowner’s flexible schedule.

• Copy key makes programming easier and faster for

the installer and homeowner.

• Daylight Savings Time (DST) key for quick change in

and out of Daylight Savings Time.

• Models available with programmable fan operation for

added homeowner comfort.

• Easy temporary temperature setpoint changes for

current period, vacation hold (1 to 255 days) or

indefinite hold adds to the homeowner comfort and

energy savings.

• Most frequently used keys are located by the Liquid

Crystal Display (LCD) for quick and easy access to

information.

• Attractive styling complements any decor to the

homeowner’s delight.

• Back lighting the large display makes the LCD very

easy to read.

• Models available with outdoor temperature sensor

capability for homeowner convenience. The sensor is

also more accurate than a thermometer.

• Configurable features allows one model to be used to

replace many different models (less inventory, no

longer need to carry separate models to get these

features).

— °F or °C temperature display;

— automatic or manual changeover;

— electric or conventional heat fan operation;

— adjustable heating cycle rate.

• Minimum off time for cooling compressors and heat

pumps protects the equipment and extends the

equipment life.

• Easy installation, setup and system test saves

installer time and increases productivity.

• System test simplifies troubleshooting and saves time

by overriding the time delays.

• Adaptive Intelligent Recovery® control brings the

room temperature to temperature setpoint at the

programmed time, maximizing comfort and energy

savings.

• Setpoints are permanently held in memory (no

batteries used) and retained during power outages for

increased installer and homeowner convenience.

• Universal Versaguard™ Thermostat guards available

for added security.

Contents

General ............................................................................... 1

Features .............................................................................. 1

Specifications ...................................................................... 2

Ordering Information ........................................................... 2

Installation ........................................................................... 3

Wiring .................................................................................. 4

Settings ............................................................................... 6

Installer Setup ..................................................................... 7

Installer System Test ........................................................... 10

Programming....................................................................... 12

Operation ............................................................................ 16

Troubleshooting Guide ........................................................ 18

Cross Reference ................................................................. 19

Wiring Diagram ................................................................... 20

68-0166-1

1 2 3 4 5 6 ... 19 20

Summary of Contents

Page 1 - Programmable Thermostat

Page 2 - SPECIFICATIONS

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—1102. Press Day until the current day is displayed.NOTE: Sun=Sunday, Mon=Monday, Tue=Tues

Page 3 - RECYCLING NOTICE

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—111Table 8. Installer System Test Options.3. Press the increase ▲ key again to display th

Page 4

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—112PROGRAMMINGThe keyboard is located behind the thermostat cover withthree frequently us

Page 5 - Mounting Thermostat Wallplate

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—113Setting the Current Day and TimeIMPORTANTAlways press the keys with your fingertip or

Page 6 - SETTINGS

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—1145. Press Heat/Cool Settings to switch to other systemtemperature setpoint.NOTE: The pr

Page 7 - INSTALLER SETUP

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—1154. Repeat steps 2 and 3 for all the periods to be cleared.5. Press Run Program.Setting

Page 8

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—1166. Press increase ▲ or decrease ▼ key to adjust thetemperature setting, if desired

Page 9 - Setting Current Day and Time

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—117Operation SequenceThe thermostat energizes specific terminals depending whatthe Fan an

Page 10 - TEST NUMBER

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—118TROUBLESHOOTING GUIDERefer to Table 12 for troubleshooting information.Table 12. Troub

Page 11 - Thermostat Information

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—119CROSS REFERENCERefer to Table 13 for thermostat cross referencing information.Table 13

Page 12 - PROGRAMMING

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—12ORDERING INFORMATIONWhen purchasing replacement and modernization products from your TR

Page 13 - Programming the First Day

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—120Honeywell Europe S.A.3 Avenue du Bourget1140 BrusselsBelgiumHoneywell Asia Pacific Inc

Page 14 - Copying a Day

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—13Dimensions:See Fig. 1.INSTALLATIONWhen Installing this Product…1. Read these instructio

Page 15 - T8624D CHRONOTHERM

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—14Fig. 2. Typical location of thermostat.Fig. 3. Mounting the wallplate.5 FEET[1.5 METERS

Page 16 - P+I Control

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—15Table 4. Terminal Designations and Descriptions.Fig. 4. Proper wiring technique.Mountin

Page 17 - Thermostat Operation

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—16SETTINGSUsing Thermostat KeysThe thermostat keys are used to:• set current day and time

Page 18 - TROUBLESHOOTING GUIDE

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—17NOTE: Always press the keys with your fingertip or similarblunt tool. Sharp instruments

Page 19 - CROSS REFERENCE

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—18Table 6. Thermostat Installer Setup Options.Installer SetupNumber (PressTime ▲ key toFa

Page 20

T8624D CHRONOTHERM® IV DELUXE PROGRAMMABLE THERMOSTAT68-0166—19Table 6. Thermostat Installer Setup Options (continued).IMPORTANTReview the settings to