Honeywell T8624D specifications

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