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