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1 68-0076—1
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Selection/Application ..................................... 5
Installation ................................................... 12
Checkout ....................................................... 18
Programming The Thermostat ..................... 20
Operating The Thermostat ........................... 25
Operation ..................................................... 27
Troubleshooting ........................................... 29
Glossary ....................................................... 30
Table of Contents ......................................... 32
T8611M
(7-Day Programming)
Chronotherm III™
Heat Pump Thermostats
The T8611M Chronotherm III Programmable
Thermostat provides automatic control of multi-
stage heat pump systems and offers users the
highest standard of comfort and convenience
available with energy savings.
■ 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 the wall to provide up to four tem-
perature periods per day.
■ Large digital clock (liquid crystal display) indi-
cates continuous time-of-day, day-of-week, cur-
rent period and room temperature.
■ Adaptive Intelligent Recovery™ brings room tem-
perature to programmed temperature at program-
med time, maximizing comfort and energy sav-
ings.
■ 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 program
override (vacation/holiday).
■ Installer self-test with time delay override saves
installation time.
■ SYSTEM light-emitting diode (LED) on thermo-
stat indicates system is energized.
■ AUX. HT., EM. HT., CHECK LEDs available on
select models.
■ Automatic 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.
■ Model available with separate sensor for remote
temperature sensing.
C. H. • Rev. 10-92 • ©Honeywell Inc. 1992 • Form Number 68-0076—1