1 68-0058—1
T8621A,C,DChronotherm™ III FuelSaver Thermostats C. H. • Rev. 8-92 • ©Honeywell Inc. 1992 • Form Number 68-0058—1
■Full seven-day program capability; different sched-
ules may be selected for every day.
■Can be programmed in hand (with batteries in-
stalled) or on wall to provide up to four temperature
settings per day.
■Large digital clock (liquid crystal display) indi-
cates continuous time, day, current period and
room temperature.
■Adaptive Intelligent Recovery™ brings room
temperature 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, requir-
ing an extra (24V) wire to thermostat.
■Fan operation switch included on back of SUPER
TRADELINE models to select either indepen-
dent or direct thermostat control of fan in heating.
■Models available with separate sensor for remote
mounting.
CONTENTS
Specifications ............................................... 2
Ordering Information................................... 2
Selection/Application ................................... 5
Installation ................................................... 7
Checkout..................................................... 17
Programming the Thermostat ....................19
Operating the Thermostat ..........................25
Operation ................................................... 28
Troubleshooting ......................................... 29
Glossary ..................................................... 30
Table of Contents .......................................31