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T8624D Chronotherm
®
IV Deluxe
Programmable Thermostat
PRODUCT DATA
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
APPLICATION
The T8624D Chronotherm® IV Deluxe Programmable
Thermostat provides electronic control of 24 Vac multistage
heating and cooling systems.
FEATURES
• Full seven-day program capability; different schedules
and temperature setpoints may be selected for
everyday to match the homeowner’s flexible schedule.
• Copy key makes programming easier and faster for
the installer and homeowner.
• Daylight Savings Time (DST) key for quick change in
and out of Daylight Savings Time.
• Models available with programmable fan operation for
added homeowner comfort.
• Easy temporary temperature setpoint changes for
current period, vacation hold (1 to 255 days) or
indefinite hold adds to the homeowner comfort and
energy savings.
• Most frequently used keys are located by the Liquid
Crystal Display (LCD) for quick and easy access to
information.
• Attractive styling complements any decor to the
homeowner’s delight.
• Back lighting the large display makes the LCD very
easy to read.
• 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
longer 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 the equipment and extends the
equipment life.
• Easy installation, setup and system test saves
installer time and increases productivity.
• System test simplifies troubleshooting and saves time
by overriding the time delays.
• Adaptive Intelligent Recovery® control brings the
room temperature to temperature setpoint at the
programmed time, maximizing comfort and energy
savings.
• Setpoints are permanently held in memory (no
batteries used) and retained during power outages for
increased installer and homeowner convenience.
• Universal Versaguard™ Thermostat guards available
for added security.
Contents
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Wiring .................................................................................. 4
Settings ............................................................................... 6
Installer Setup ..................................................................... 7
Installer System Test ........................................................... 10
Programming....................................................................... 12
Operation ............................................................................ 16
Troubleshooting Guide ........................................................ 18
Cross Reference ................................................................. 19
Wiring Diagram ................................................................... 20
68-0166-1