PRODUCT DATA
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • • All Rights Reserved
T8501 and T8511
Deluxe Electronic Thermostats
APPLICATION
The T8501 and T8511 Deluxe Electronic Thermostats provide
electronic control of 18 to 30 Vac single stage or multistage
heating and cooling systems, including heat pump systems.
T8501/T8511
FEATURES AND BENEFITS
• Attractive styling complements any decor to the
homeowner’s delight.
• Ease-of-use means fewer homeowner questions and
increased homeowner satisfaction.
• Back lighting the large display makes the Liquid
Crystal Display (LCD) very easy to read.
• Most frequently used keys are located by the LCD for
quick and easy access to information.
• 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
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 and extends the life of the equipment.
• Easy installation, setup and system test saves
installer time and increases productivity.
• System test simplifies troubleshooting and saves time
by overriding the time delays.
• Setpoints are permanently held in memory (no
batteries used) and retained during power outages for
increased installer and homeowner convenience.
Contents
Application........................................................................... 1
T8501/T8511 Features and Benefits ................................... 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Wiring .................................................................................. 4
Settings ............................................................................... 6
Installer Setup ..................................................................... 6
Installer System Test ........................................................... 8
Checkout ............................................................................. 10
Operation ............................................................................ 11
Wiring Diagrams (Fig. 13-18) .............................................. 12
Troubleshooting Guide ........................................................ 14
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General
