Table of Contents
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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.
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. • All Rights Reserved
T8624D Chronotherm
Programmable Thermostat
• 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.
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
®
IV Deluxe
PRODUCT DATA
Contents
68-0166-1
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Table of Contents
Related Manuals for Honeywell CHRONOTHERM IV DELUXE T8624D
Summary of Contents for Honeywell CHRONOTHERM IV DELUXE T8624D
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Page 1: Table Of Contents
• Back lighting the large display makes the LCD very easy to read. ® U.S. Registered Trademark Copyright © 1997 Honeywell Inc. • All Rights Reserved Programmable Thermostat • Models available with outdoor temperature sensor capability for homeowner convenience. The sensor is also more accurate than a thermometer. -
Page 2: Specifications
Honeywell, 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A. -
Page 3: Installation
4. After completing installation, use these instructions to check out the product operation. Location 1-9/16 (40) Install the thermostat about 5 ft (1.5m) above the floor in an area with good air circulation at average temperature. (13) See Fig. 2. 3-3/4... -
Page 4: Wiring
1. Loosen the terminal screws on the wallplate and connect the system wires. See Fig. 4 IMPORTANT MOUNTING Use 18 gauge, color-coded thermostat cable for HOLES proper wiring. MOUNTING SCREWS 2. Securely tighten each terminal screw. - Page 5 1. Engage tabs at the top of thermostat and wallplate. See Fig. 5. 2. Press lower edge of case to latch. NOTE: To remove the thermostat from the wall, first pull out at the bottom of the thermostat; then remove the top. ®...
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Page 6: Settings
AND STANDARD TIME COPY ONE PROGRAMMED DAY TO ANOTHER DAY 68-0166—1 System settings control the thermostat operation as follows: Heat: The thermostat controls the heating. Off: Both the heating and cooling are off. Cool: The thermostat controls the cooling. Auto: The thermostat automatically changes between heating and cooling operation, depending on the indoor temperature. -
Page 7: Installer Setup
Table 6 and if no changes are necessary, go to the Installer System Test section. The Installer Setup is used to customize the thermostat to specific systems. Some of the options include temperature display, changeover and outdoor temperature display. Installer Setup numbers are listed in Table 6. - Page 8 (models with OT terminals) Not used 25 thru 29 Deadband The cycle rate for the last stage of heat is adjustable with 6 cph being the factory setting. 68-0166—1 Table 6. Thermostat Installer Setup Options. Factory-Setting (Press Display Description Display —...
- Page 9 Review the settings to confirm that they match the system. Press Run Program to exit the Installer Setup. The thermostat has saved the Installer Setup changes and initiated a reset in order to operate with these new settings. Be sure to set the current day and time immediately.
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Page 10: Installer System Test
Heat Daylight Copy Time INSTALLER SYSTEM TEST Use the Installer System Test to check the thermostat operation. Refer to Table 7 for a list of the available system tests. To start the system test: CAUTION The minimum off time for compressors is bypassed during the Installer System Test. - Page 11 Program key will not exit from this test. To exit, go to a different test and press Run Program. Thermostat Information 1. Press the Time key to access the thermostat information. 2. Press the increase key to display the production date code.
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Page 12: Programming
The thermostat display shows day, time, program period, temperature, system and fan operation selection. The thermostat can be set for four times and up to eight temperatures for each day of the week (28 independent time and 56 temperature settings). The Table 9. - Page 13 Settings Heat Daylight Copy Time ® T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Programming the First Day Start by programming the Wake time and temperature (and fan operation on select models) for any one day: 1. Press Wake. Program Wake Hold Temp 2.
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Page 14: Copying A Day
Heat Daylight Copy Time Copying a Day NOTE: The thermostat must be in the program mode to use the copy feature. Go to step 2 if the thermostat is already in the program mode. 1. Press Wake. Set Program Time... -
Page 15: Setting Temporary Temperatures
18 days) M10332 Time 3. Press Wake, Leave, Return or Sleep to select the period the program will start. (Example: Return = thermostat will stop the Hold at the Return period start time) Setting Heat M10333... -
Page 16: Operation
Hold Temp System Settings Heat Daylight Copy Time Displaying the Outdoor Temperature If your thermostat is equipped with an outdoor sensor, you can check the temperature at the sensor by pressing i once. Time Set Program Set Current Wake Leave Return... - Page 17 Installer Setup. Thermostat Operation Startup When power to the thermostat is turned on, a startup and initialization program begins. The startup occurs only on initial powerup. After total loss of power for an extended period, the current time and day may need to be set, but the user program is held.
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Page 18: Troubleshooting Guide
— check if the system fuse is blown—replace the fuse. — check if the power switch on the HVAC equipment is in the Off position—set to the On position. — check wiring between thermostat and HVAC equipment—replace any broken wires and tighten any loose connections. -
Page 19: Cross Reference
Table 13. Thermostat Cross Reference Information. Model Number Description T8624C Two-stage heat and two-stage cool conventional thermostat; powered direct from 24 Vac transformer; manual changeover; system switch—HEAT-OFF-COOL-AUTO; fan switch—ON-AUTO; O and B terminals T8624C1008 Trane; Premier White color; part no. -
Page 20: Wiring Diagram
Fig. 14. Typical hookup of T8624D in multistage system. Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis MN 55408-0524 Honeywell Latin American Region 480 Sawgrass Corporate Parkway Suite 200 Sunrise FL 33325 68-0166—1 68-0166—1 J.H. Rev. 10-97...