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Universal Microelectronic T8511G manual

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Table of contents for the manual

  • Page 1

    X-XX UL INST ALLA TION INSTRUCTIONS ®U.S. Registered Trademark • • All Rights Reserved Microelectronic Heat Pump Thermostats T851 1G APPLICA TION The T8511G Microelectronic Heat Pump Thermostat provides electronic control of 24 Vac, two-stage heating and one- stage cooling heat pump systems. Refer to Table 1 for a general description of the th[...]

  • Page 2

    69-0961—4 2 MICROELECTRONIC HEA T PUMP THERMOST A T Fig. 1. Typical location of thermostat. 5 FEET [1.5 METERS] YES NO NO NO M10106 Fig. 2. Mounting the wallplate. 2. Use a pencil to mark the mounting holes. See Fig. 2. 3. Remove the wallplate from the wall and drill two 3/16 inch holes in the wall (if drywall) as marked. For firmer material such[...]

  • Page 3

    69-0961—4 3 MICROELECTRONIC HEA T PUMP THERMOST A T Fig. 3. Typical hookup in heat pump application. Fig. 4. Typical hookup in heat pump system with emergency heat relay. Fig. 5. Typical hookup in heat pump application with emergency heat relay and O/B terminal. Fig. 6. Proper wiring technique. Mounting Thermostat 1. Engage tabs at the top of the[...]

  • Page 4

    69-0961—4 4 MICROELECTRONIC HEA T PUMP THERMOST A T Fig. 10. T8511G (automatic changeover) system and fan key locations. NOTE: Always press the system and fan keys with your fingertip or similar blunt tool. Sharp instruments like a pen or pencil point can damage the keyboard. T emperature Settings The default setpoint for heat is 70 ° F (21 ° C[...]

  • Page 5

    69-0961—4 5 MICROELECTRONIC HEA T PUMP THERMOST A T INST ALLER SETUP NOTE: For most applications, the thermostat factory settings do not need changing. Review the Factory Setting column in Table 2 and if no changes are necessary, go to the Installer System-Test section. Use the Installer Setup to customize the thermostat to specific systems. Some[...]

  • Page 6

    69-0961—4 6 MICROELECTRONIC HEA T PUMP THERMOST A T Table 2. Thermostat Installer Setup Options (Continued). Installer Setup Number (Press i key Factory Setting Other Choices (Press ▲ or ▼ key to change) Actual Select to change) Display Description Display Description Setting Extended fan operation in heating. 19 00 No extended fan operation [...]

  • Page 7

    69-0961—4 7 MICROELECTRONIC HEA T PUMP THERMOST A T Em HeatOffCool Auto Only Heat Cool OnAuto System Fan Room Outdoor Em Ht Temporary Setting Wait %Humid Aux Ht Remote Repl Batt M4844 INST ALLER SYSTEM-TEST Use the Installer System-Test to check the thermostat configurations and operation. Refer to Table 3 for a list of the available system-tests[...]

  • Page 8

    69-0961—4 8 MICROELECTRONIC HEA T PUMP THERMOST A T Table 4. Installer System-Test Options (Continued). M6791 M4864 M4865 M4866 Thermostat Information 1. Press the Information i key to access the thermo- stat information. 2. Press the increase ▲ key to display the production date code. The first two large digits are the month and the third digi[...]

  • Page 9

    69-0961—4 9 MICROELECTRONIC HEA T PUMP THERMOST A T M4867 5. Press the increase ▲ key again to display the EEPROM identification code (Example: 222 = EEPROM ID 222). 6. Press and hold the increase ▲ and decrease ▼ keys until the room temperature is displayed to exit the system-test. The system-test times out after five minutes without any k[...]

  • Page 10

    69-0961—4 10 MICROELECTRONIC HEA T PUMP THERMOST A T TROUBLESHOOTING GUIDE (Continued) a Available on select models. Symptom Possible Cause Action Heating will not come on. Thermostat minimum off-time is activated. Wait up to five minutes for the system to respond. (continued) System selection is not set to Heat. Set system selection to Heat. O/B[...]

  • Page 11

    69-0961—4 11 MICROELECTRONIC HEA T PUMP THERMOST A T[...]

  • Page 12

    Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarorough, Ontario M1V 4Z9 69-0961—4 G.H. Rev . 05-04 Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 www .honeywell.com/yourhome[...]