Honeywell T8501 Product Data
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Honeywell T8501 Product Data

Honeywell T8501 Product Data

Deluxe electronic thermostats
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See also: Owner's Manual , Instruction and Installation Manual

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.
® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc. •
Deluxe Electronic Thermostats
• All Rights Reserved
T8501 and T8511
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.
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
PRODUCT DATA
Contents
68-0162-1

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Summary of Contents for Honeywell T8501

  • Page 1: Table Of Contents

    • Minimum off time for cooling compressors and heat pumps protects and extends the life of the equipment. The T8501 and T8511 Deluxe Electronic Thermostats provide • Easy installation, setup and system test saves electronic control of 18 to 30 Vac single stage or multistage installer time and increases productivity.

  • 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

    T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS Operating Ambient Temperature: INSTALLATION 40°F to 110°F (4°C to 43°C). When Installing this Product... Shipping Temperature Range: Minus 20°F or 130°F (-29°C to 54°C). 1. Read these instructions carefully. Failure to follow the instructions can damage the product or cause a Operating Relative Humidity Range: hazardous condition.

  • Page 4: Wiring

    T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS 5 FEET [1.5 METERS] M10106 Fig. 2. Typical location of thermostat. 3. Remove the wallplate from the wall and drill two 3/16 WIRING inch holes in the wall (if drywall) as marked. For firmer...

  • Page 5: Mounting Thermostat

    T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS CAUTION Mounting Thermostat 1. Engage tabs at the top of thermostat and wallplate. Disconnect power before wiring to prevent electrical See Fig. 5. shock or equipment damage. 2. Press lower edge of case to latch.

  • Page 6: Settings

    T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS SETTINGS A combination of key presses are required to use the Installer Setup feature. — To enter the Installer Setup, press and hold the System and Fan Settings Information i key with the increase and decrease keys until the first number is displayed.
  • Page 7 T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS Table 4. Thermostat Installer Setup Options. Installer Setup Other Choices Number Factory-Setting (Press key to change) (Press i key Actual to change) Setting Select Display Description Display Description Not used — — — —...

  • Page 8: Installer System Test

    -3—Display adjusts to 3°F lower than actual room temperature Number 02 must be set to 01 to extend fan operation on T8501. Available on select models. IMPORTANT Review the settings to confirm that they match the system.
  • Page 9 T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS Table 5. Tests Available in the Installer System Test. Test Number System Test Description 10-19 Heating equipment can be turned on and off 20-29 Emergency heat (select models) equipment can be turned on and off...

  • Page 10: Checkout

    T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS 5. Press the increase key again to display the EEPROM Thermostat Information identification code. 1. Press the Information i key to access the thermostat (Example: 222 = EEPROM ID 222). information. M4867 M4864 6. Press and hold the increase...

  • Page 11: Operation

    T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS OPERATION Operation Sequence The thermostat energizes specific terminals depending what the Fan and System are set to. The LCD will display symbols Thermal Performance and words to report the condition of system. See Tables 7 and During severe weather, the thermostat actually controls closer 8 for specific information.

  • Page 12: Wiring Diagrams (Fig. 13-18)

    T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS Minimum-Off Timing THERMOSTAT A minimum-off timer assures that the cooling compressor or heat pump compressor does not come on again for at least five minutes after it turns off. The minimum-off timer is triggered when the compressor goes off and when the system...
  • Page 13 The upper or lower Check the temperature setpoints: not change. (Example: temperature limits were • T8511 heating limits are 40°F to 90°F (7°C to 31°C) and T8501 Cannot set the heating reached. heating limits are 45°F to 88°F higher or the cooling lower.) •...

  • Page 14: Troubleshooting Guide

    T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS TROUBLESHOOTING GUIDE (continued) Symptom Possible Cause Action Heating will not come on. No power to the • Check that C terminal is connected to the system transformer. thermostat. • Check for 24 Vac between C and R or RH terminals.
  • Page 15 T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS 68-0162—1...
  • Page 16 T8501 AND T8511 DELUXE ELECTRONIC THERMOSTATS Home and Building Control Home and Building Control Honeywell Asia Pacific Inc. Honeywell Inc. Honeywell Limited-Honeywell Limitée Room 3213-3225 Honeywell Plaza 155 Gordon Baker Road Sun Hung Kai Centre P.O. Box 524 North York, Ontario No.

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T8511

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