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

The T8624C,D Chronotherm III Program-

mable Fuel Saver Thermostats provide auto-

matic control of multistage heating/cooling sys-

tems and offer users the highest standard of

comfort and convenience available with energy

savings.

Different schedules may be selected for week-
days, Saturday and Sunday.
Can be programmed in hand (with batteries in-
stalled) or on wall to provide up to four tempera-
ture settings per day.
Large digital clock (liquid crystal display) indi-
cates continuous time, day, current period and
room temperature.
Adaptive Intelligent Recovery™ brings room tem-
perature to programmed temperature at pro-
grammed time, maximizing comfort and energy
savings.
Temperature control program maintains tempera-
ture within 1° F of setpoint.
Temporary program override available by using:
—WARMER and COOLER keys.
—SKIP next period key.
—CHANGE to last period key.
HOLD TEMP key provided for indefinite pro-
gram override (vacation/holiday).
Installer self-test and time delay override save
installation time.
SYSTEM light-emitting diode (LED) indicates
system is energized.
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, re-
quiring 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.
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
T8624C,D (5-1-1 Day
Programming) Chronotherm®
III Fuel Saver Thermostats