Instruction/ maintenance manual of the product T8511G Honeywell
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X-XX UL INST ALLA TION INSTRUCTIONS ®U.S. Registered Trademark Copyright © 2004 Honeywell International Inc. All Rights Reserved T851 1G,R Microelectronic Heat Pump Thermostats APPLICA TION The T8511 Microelectronic Heat Pump Thermostat provides electronic control of 24 Vac two-stage heating and one-stage cooling heat pump systems.
69-0927—4 2 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS 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.
69-0927—4 3 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS 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.
69-0927—4 4 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS Fig. 10. T8511G (automatic changeover) system and fan keys location. 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.
69-0927—4 5 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS INST ALLER SETUP NOTE: For most applications, the thermostat factory- settings do not need to be changed. Review the factory settings in Table 2 and if no changes are necessary, go to the Installer System-Test section.
69-0927—4 6 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS Table 2. Thermostat Installer Setup Options (Continued). a T8511G is 48 ° F. Installer Setup Number (Press i key Factory-Setting Other.
69-0927—4 7 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS 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.
69-0927—4 8 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS 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.
69-0927—4 9 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS 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 together, until the room temperature is displayed, to exit the system-test.
69-0927—4 10 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS 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.
69-0927—4 11 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS.
69-0927—4 12 T851 1G,R MICROELECTRONIC HEA T PUMP THERMOST A TS 69-0927—4 G.H. Rev . 04-04 www .honeywell.com/yourhome Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarorough, Ontario M1V 4Z9 Automation and Control Solutions Honeywell International Inc.
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