Honeywell T8501 User's Manual
Contents
1. 69 0925 4 T8501 MICROELECTRONIC THERMOSTATS Table 2 Thermostat Installer Setup Options Continued Installer Setup Other Choices Number Press Factory Setting Press A or W key to change i key to Select change Display Description Display Description Degree 14 00 Temperature is 01 Temperature is displayed in C temperature displayed in F display Not Used 15 thru 18 Extended fan 19 00 No extended fan 01 Fan operation is extended 90 operation in operation after the seconds after the call for heat heating call for heat ends ends Extended fan 20 00 No extended fan 01 Fan operation is extended 90 operation in operation after the seconds after the call for cool cooling call for cool ends ends Not Used 21 thru 23 Outdoor 24 00 No outdoor 01 Outdoor temperature is temperature temperature is displayed Needs a C7089B1000 display displayed Outdoor Temperature Sensor to operate Not Used 25 thru 32 Minimum off 33 05 5 minutes minimum 00 01 Minimum number of minutes 0 time for the off time for the 02 03 thru 5 the compressor will be off compressor compressor or 04 between calls for the compressor Temperature 34 90 Heating setpointcan 40 to 90 Number can be set anywhere range stops be set no higher between 40 and 90 in 1 F in heating than 90 F increments Temper2. U S Registered Trademark Copyright 2004 Honeywell All Rights Reserved Do not install the thermostat where it can be affected by drafts or dead spots behind doors and in corners hot or cold air from ducts radiant heat from sun or appliances concealed pipes and chimneys unheated uncooled areas such as an outside wall behind the thermostat Wallplate Installation The thermostat can be mounted horizontally on the wall or on a 2 in x 4 in 50 8 mm x 101 6 mm wiring box Position wallplate horizontally on the wall or on a 2 in x 4 in 50 8 mm x 101 6 mm wiring box 1 Position and level the wallplate for appearance only The thermostat will function properly even when not level 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 76 mm holes in the wall if drywall as marked For firmer material such as plaster drill two 7 32 inch 5 56 mm holes Gently tap anchors provided into the drilled holes until flush with the wall 4 Position the wallplate over the holes pulling wires through the wiring opening 5 Loosely insert the mounting screws into the holes 6 Tighten mounting screws 69 0925 4 T8501 MICROELECTRONIC THERMOSTATS 1 5 METERS 5 FEET M10106 Fig 1 Typical location of thermostat WALL WIRES THROUGH WALL MOUNTING HOLES MOUNTING SCRE
3. A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A AVAILABLE ON SELECT MODELS A JUMPER Rh TO Rc IN A SINGLE TRANSFORMER SYSTEM M4820 Fig 5 Typical hookup in heat and cool system with two transformers FOR WRAPAROUND INSERTION STRIP 7M6 IN 11 MM y WSIS Fig 6 Correct wiring technique FOR STRAIGHT INSERTION STRIP 5 16 IN 8 MM Mounting Thermostat 1 Engage tabs at the top of the thermostat and wall plate See Fig 7 2 Press lower edge of case to close and latch NOTE Toremove the thermostat from the wall first pull out at the bottom of the thermostat remove top last A ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE M6798A Fig 7 Mounting thermostat on wallplate 69 0925 4 T8501 MICROELECTRONIC THERMOSTATS Using Thermostat Keys The thermostat keys are used to set the temperature display present setting configure Installer Setup check System Test display outdoor temperature select models Select models have keys to set the system operation set the fan operation NOTE Always press the keys with your fingertip or sim ilar blunt tool Sharp instruments like a pen or pencil point can damage the keyboard See Fig 8 for key locations INCREASE TEMPERATURE SETTING DECREASE TEMPERATURE SETTING BEA DISPLAY PRESENT SETTINGS AND SCROLL THROUG
4. 105B Fig 11 Display of Installer Setup number and setting CAUTION Equipment Damage Hazard Heat pump and electric heat systems can be damaged when run without fan Configure to 01 in Installer Setup number 02 to prevent equipment damage IMPORTANT Only configurable numbers are shown on the device Example If thermostat does not have a system key Installer Setup Number 12 does not display Review Table 3 factory settings and mark any desired changes in the Actual Setting column When Installer Setup is complete review the settings to confirm that they match the system Table 2 Thermostat Installer Setup Options Installer Setup Other Choices Number Press Factory Setting Press A or W key to change i key to Select change Display Description Display Description Not Used 01 Fan 02 0 Conventional 01 Heat pump or electric heat operation applications where applications where thermostat equipment controls controls fan operation in heat fan operation in heat mode mode Not Used 03 Heating cycle 04 6 6 cph used for 01 03 01 1 cph used for radiant floor rate conventional or 09 heat gravity system systems 03 3 cph used for hot water systems or high efficiency furnaces 09 9 cph used for electric heat systems Not Used 05 thru 11 Changeover 12 01 Manual changeover 00 00 Auto changeover T8501D only Not used 13
5. H INSTALLER SETUP INFORMATION KEY M6801A Fig 8 Thermostat key locations and descriptions SETTINGS System and Fan Settings System settings control the thermostat operation 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 Fan settings control the system fan On Fan operates continuously Auto Fan operates with equipment The system default setting is Heat and the fan default setting is Auto Use the keyboard or System and Fan switches depending on model to change to the desired settings See Fig 9 69 0925 4 A LED INDICATOR M10147C Fig 9 T8501 System and Fan key locations Temperature Settings The default setpoint for heat is 70 F 21 C and for cool is 78 F 25 5 C Press the increase A or decrease W key to change the present setting To change between heat and cool press the Information i key until the setting to be changed appears INSTALLER 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 Self Test section The Installer Setup is used to customize the thermostat to specific systems Some of the options inc
6. Honeywell T8501 Microelectronic Thermostats APPLICATION INSTALLATION INSTRUCTIONS The T8501 Microelectronic Thermostats provides electronic control of 24 Vac single stage heating and cooling systems Refer to Table 1 for a general description of the thermostat All T8501 thermostats require a common wire to supply power Table 1 Description of T8501 Thermostats Fan System Changeover System Selection Selection Comments Heat Cool Automatic Heat Off Cool Auto On Auto System and fan selections are done by keyboard MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube do not place your old control in the trash Dispose of properly Contact your local waste management authority for instructions regarding recycling and the proper disposal of the old control INSTALLATION mee Installing this Product Read these instructions carefully Failure to follow the instructions can damage the product or cause a hazardous condition 2 Check the ratings given in the instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced service technician 4 After completing installation use these instructions to check out the product operation Location Install the thermostat about 1 5m 5 ft above the floor in an area with good air circulation at average temperature See Fig 1
7. WS M6530A Fig 2 Mounting the wallplate WIRING All wiring must comply with local electrical codes and ordinances Refer to Fig 3 and 5 for typical hookup A letter code is located near each terminal for identification 69 0925 4 CAUTION Electrical Shock Hazard Can cause electrical shock and equipment damage Disconnect power before wiring 1 Loosen the terminal screws on the wallplate and connect the system wires See Fig 6 IMPORTANT Use 18 gauge color coded thermostat cable for proper wiring Securely tighten each terminal screw Push excess wire back into the hole Plug the hole with nonflammable insulation to pre vent drafts from affecting the thermostat AON THERMOSTAT EATING RELAY OR VALVE COIL A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A AVAILABLE ON SELECT MODELS M4822 Fig 3 Typical hookup in heat only application T8501 MICROELECTRONIC THERMOSTATS THERMOSTAT OUTDOOR HEATING TEMPERATURE RELAY OR SENSOR VALVE COIL COMPRESSOR CONTACTOR L1 HOT d L2 A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A AVAILABLE ON SELECT MODELS M4821 Fig 4 Typical hookup in heat and cool system with one transformer THERMOSTAT OUTDOOR TEMPERATURE SENSOR COMPRESSOR HEATING CONTACTOR RELAY OR VALVE COIL COOL CHANGEOVER VALVE OR DAMPER
8. aker 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 If 24 Vac is present proceed with troubleshooting Thermostat minimum off time is activated Wait up to five minutes for the system to respond Enter Installer Setup number 33 Reconfigure minimum off time if required System selection is not set to Cool Set system selection to Cool System on indicator is displayed but no heat is being delivered Fan operation set for 00 conventional heat when it should be set for 01 electric heat Enter Installer Setup mode number 02 and reconfigure the fan operation Conventional heating equipment turns on the fan when the furnace has warmed up to setpoint Wait a minute after seeing the On indicator and then check the registers Heating equipment is not operating Verify operation of heating equipment in self test Outdoor tempera ture not displayed Option not activated Enter Installer Setup number 24 and set to 01 Thermostat must have OT terminals and a C7089B1000 installed Outdoor temperature display is incorrect Outdoor sensor is connected incorrectly Refer to C7089B1000 installation instructions and check wiring between the ther
9. ature 35 45 Lowest setpoint 45 to 99 Number can be set anywhere range stops cooling can be set between 45 and 99 in 1 F in cooling to increments System On 36 00 LCD On symbol is 01 Display is disabled usually set display displayed when for 01 for a zoned system system is energized Temperature 37 00 No difference in 3 thru 01 Display adjusts to 1 F higher display displayed 03 than actual room temperature adjustment temperature and 02 Display adjusts to 2 F higher actual room than actual room temperature temperature 03 Display adjusts to 3 F higher than actual room temperature 1 Display adjusts to 1 F lower than actual room temperature 2 Display adjusts to 2 F lower than actual room temperature 3 Display adjusts to 3 F lower than actual room temperature aAvailable on select models Mode 02 must be set to 01 to extend fan operation IMPORTANT Review the settings to confirm that they match the system Press Run Program to exit the Installer Setup The thermostat has saved the 69 0925 4 Installer Setup changes and initiated a reset in order to operate using the new settings Be sure to set the current day and time immediately T8501 MICROELECTRONIC THERMOSTATS INSTALLER SYSTEM TEST Use the Installer System Test to check the thermostat operation Refer to Table 3 for a list of the available system tests CAUTION Equipment Damage Hazard Mini
10. ature setpoints e Heating limits are 40 to 90 F 4 5 to 32 C Cooling limits are 45 to 99 F 7 to 37 C The setpoint temperature range stops were configured Check Installer Setup numbers 34 and 35 and reconfigure the setpoint stops Heating will not come on No power to the thermostat e Check that C terminal is connected to the system transformer e Check for 24 Vac between C and R or RH terminals If missing 24 Vac check if the circuit breaker is tripped reset the circuit breaker check if the system fuse is blown replace the fuse check if the System 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 If 24 Vac is present proceed with troubleshooting Thermostat minimum off time is activated Wait up to five minutes for the system to respond System selection is not set to Heat Set system selection to Heat 69 0925 4 T8501 MICROELECTRONIC THERMOSTATS Table 5 Troubleshooting Guide Continued Symptom Possible Cause Action Cooling will not No power to the thermostat e Check that C terminal is connected to the system come on transformer e Check for 24 Vac between C and R or RC and Y terminals If missing 24 Vac check if the circuit breaker is tripped treset the circuit bre
11. d Fan Key System Test Fan switch cannot be tested Fan 68 Fan 69 a Available on select models 69 0925 4 8 T8501 MICROELECTRONIC THERMOSTATS THERMOSTAT INFORMATION 1 Press the i key to access the thermostat informa tion M4864 2 Press the increase A key to display the production date code The first two large digits are the month and the third digit is the last digit of the year Exam ple 026 February 1996 M4865 3 Press the increase A key again to display the soft ware identification code Example 02 software ID code 2 M4866 4 Press the increase A key again to display the soft ware revision number Example 001 revision number 1 M6791 5 Press the increase A key again to display the EEPROM identification code Example 222 EEPROM ID 222 M4867 6 Press and hold the increase A and decrease Y keys together until the room temperature is dis played to exit the system test mode The system test times out after five minutes without any key presses CHECKOUT Outdoor Temperature Sensor Select Models Allow the outdoor temperature sensor to take in the outdoor air for a minimum of five minutes before taking a reading With an accurate thermometer 1 F 0 5 C measure the temperature at the sensor location allowing time for the thermometer to stabilize before reading Match the thermometer reading to the outdoor temperature display at t
12. ent System Test Description i 10 Enter heating equipment system test Set System switch to Heat on switch models A 11 Heat comes on When Installer Setup number 02 is 01 the system fan is also energized v 10 Heat and system fan turn off Cooling Equipment System Test i 30 Change from heating to cooling equipment system test Set system switch to Cool on switch models A 31 Cool and system fan come on v 30 Cool and system fan turn off Fan Equipment System Test T8501D only i 40 Change from cooling to fan equipment system test 41 Fan comes on 40 Fan turns off 69 0925 4 T8501 MICROELECTRONIC THERMOSTATS Table 4 Installer System Test Options Continued Keys to Test Press Number Description Key or Switch Operation System Test IMPORTANT Test numbers are displayed only when the system is configured for the selected function Example Numbers 60 61 and 62 are the only numbers that are displayed when a system is configured for heat only System Key or Switch System Test When System switch is used move switch to see Test Numbers i 60 Change from cooling or fan to key operation system test System 61 Heat test number is displayed Set System switch to Heat System 62 Off test number is displayed Set System switch to Off System 63 Cool test number is displayed Set System switch to Cool System 64 Auto Test number is displaye
13. he thermostat 69 0925 4 T8501 MICROELECTRONIC THERMOSTATS TROUBLESHOOTING GUIDE Table 5 Troubleshooting Guide Symptom Display will not come on Possible Cause Thermostat is not being powered Action e Check that C terminal is connected to the system transformer e Check for 24 Vac between C and R or RH terminals If missing 24 Vac check if the circuit breaker is tripped reset the circuit breaker 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 If 24 Vac is present proceed with troubleshooting Thermostat microprocessor is locked up Remove the thermostat from the wallplate for two minutes After two minutes replace the thermostat on the wallplate Temperature display is incorrect Room temperature display has been reconfigured Enter Installer Setup number 37 and reconfigure the display Thermostat is configured for F or C display Enter Installer Setup number 14 and reconfigure the display Bad thermostat location Relocate the thermostat Temperature settings will not change Example Cannot set the heating higher or the cooling lower The upper or lower temperature limits were reached Check the temper
14. lude temperature display changeover and outdoor temperature display Installer Setup numbers are listed in Table 3 The table includes all the configuration options and the factory settings for the T8501 A combination of key presses are required to use the Installer Setup feature To enter the Installer Setup press and hold the information i key with the increase A and decrease Y keys until the first number is displayed All display segments appear for approximately three seconds before the number is displayed See Fig 11 and 12 To advance to the next Installer Setup press the i key To change a setting use the increase A or decrease W key To exit the Installer Setup press and hold the Information i key until the display returns to normal approximately three seconds The display scrolls the numbers backward to get to the normal display The Installer Setup is automatically exited if no key presses are made for five minutes NOTE Only configurable number are shown T8501 MICROELECTRONIC THERMOSTATS Remote Room lt Humid oe D pa D Lal Outdoor Em Ht Temporary Setting Aux Ht meee ad A Repl Waittew Heat Cool A gt gt gt y Fan Em HeatOffCool Auto Only OnAuto M4844 Fig 10 Display of all LCD segments INSTALLER SETUP NUMBER DISPLAY COLUMN 1 OF TABLE 2 FACTORY SETTING OR OTHER CHOICE DISPLAY COLUMN 3 OR 5 OF TABLE 2 M10
15. mostat and sensor Wrong sensor Replace sensor with C7089B1000 sensor aSelect Models 69 0925 4 T8501 MICROELECTRONIC THERMOSTATS Honeywell Automation and Control Solutions Honeywell Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 69 0925 4 GH Rev 04 04 ER pave comaina atieast 10 post consumer paper fibers www honeywell com yourhome
16. mum off time for compressor is bypassed during Installer System Test Prevent compressor from cycling too quickly To start the system test Press and hold the increase A and decrease W keys at the same time until two zeros 00 appear All segments of the LCD are displayed before 00 appears See Fig 11 and 12 Table 3 Tests Available In Installer System Test Test Number System Test Description 10 19 Heating equipment can be turned on and off 30 39 Cooling equipment can be turned on and off 40 49 Fan equipment can be turned on and off 60 0 to Keyboard keys test 60 19 70 79 Thermostat information including date code and software versions are displayed Em Ht mt Setting Remote Aux Ht ar Room me RAO TO Humid eos x K Di I me Bf Outdoor Bal O Wait 3k Heat Cool A ppp Em HeatOffCool Auto Only 11 OnAuto M4844 Fig 12 Display of all LCD segments M6792A TEST NUMBER Fig 13 Display of test number Refer to Table 4 for the directions and results of the specific tests IMPORTANT Models with System and Fan switches must set the switches to the equipment that is being checked for the equipment to operate NOTE Press and hold the increase A and decrease Y keys for three seconds to exit the system test mode The system test times out after five min utes without any key presses Table 4 Installer System Test Options Keys to Press Heating Equipm
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