Universal Microelectronic T8511G User's Manual
Contents
1. COMPRESSOR Y CONTACTOR i a FOR STRAIGHT FOR WRAPAROUND INSERTION STRIP INSERTION STRIP 5 16 IN 8 MM 7 6 IN 11 MM inie COOL i iri i RO eNaEOUER Fig 6 Proper wiring technique VALVE i Mounting Thermostat 1 Engage tabs at the top of the thermostat and RELAY wallplate See Fig 7 2 Press lower edge of case to close and latch A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A AVAILABLE ON SELECT MODELS M4828 Fig 4 Typical hookup in heat pump system with emergency heat relay 3 69 0961 4 MICROELECTRONIC HEAT PUMP THERMOSTAT A ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE M6798A Fig 7 Mounting thermostat on wallplate NOTE To remove the thermostat from the wall first pull out at the bottom of the thermostat then remove top Using Thermostat Keys Use thermostat keys to e Set temperature Display present setting Configure Installer Setup Check System Test Display outdoor temperature select models Set system operation Set fan operation See Fig 8 for the key information INCREASE TEMPERATURE SETTING DECREASE TEMPERATURE SETTING eae y DISPLAY PRESENT SETTINGS AND SCROLL THROUGH INSTALLER SETUP MODES INFORMATION KEY M6801 Fig 8 Thermostat key locations and descriptions 69 0961 4 SETTINGS System and Fan Settings System settings control the thermostat operation as2. Y keys until the room temperature is displayed to exit the system test The system test times out after five minutes without any key presses TROUBLESHOOTING GUIDE Symptom Possimie cause aen d Display will not Thermostat is not being Check that C terminal is connected to the system come on powered transformer 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 Remove the thermostat from the wallplate for 2 minutes After locked up 2 minutes replace the thermostat on the wallplate Temperature Room temperature display has Enter Installer Setup mode number 37 and reconfigure the display is incorrect been reconfigured display Thermostat is configured for F Enter Installer Setup mode number 14 and reconfigure the or C display display Bad thermostat location Relocate the thermostat Temperature The upper or lower temperature Check the temperature setpoints settings will not limits were reached e Heating limits are 40 to 90 F 4 5 to 32 C change Example e Coolin
3. connected to the system come on transformer Check for 24 Vac between C and R or RC and Y 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 at the 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 Wait up to five minutes for the system to respond activated Enter Installer Setup mode number 33 Reconfigure minimum off time if required System selection is not set to Set system selection to Cool Cool O B terminal configured Check Installer Setup mode number 29 and reconfigure incorrectly correctly O or B terminal miswired Check system description to determine whether changeover should be energized in heat B or cool O Rewire if necessary System On Heating equipment is not Verify operation of heating equipment in system test indicator is lit but operating no heat is being delivered a Available on select models 69 0961 4 10 11 69 0961 4 Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarorough Ontario MIV 4Z9 Printed in U S A o
4. Microelectronic Heat Pump Thermostats APPLICATION 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 thermostat All T8511 Thermostats require a common wire to supply power T8511G INSTALLATION INSTRUCTIONS Table 1 T8511 Thermostat Desription Fan G Automatic Em Heat Heat Off Auto Cool On Auto Use keyboard to make system and fan selections MERCURY NOTICE If this control is replacing a control that contains mercury in a sealed tube do 7ofplace your old control in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of the old thermostat INSTALLATION When Installing this Product 1 Read these instructions carefully Failure to follow the instructions can damage the product or cause a hazardous condition Check the ratings given in the instructions and on the product to make sure the product is suitable for your application Installer must be a trained experienced service technician After completing installation use these instructions to check out the product operation U S Registered Trademark All Rights Reserved CAUTION Electrical Shock or Equipment Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installati
5. er Setup to customize the thermostat to specific systems Some of the options include temperature display changeover minimum equipment on time and minimum off time Installer Setup numbers are listed in Table 2 It includes all the configuration options and the factory settings available for the T8511 IMPORTANT The Installer Setup must be set correctly for the HVAC equipment thermostat and subbase to operate properly A combination of key presses are required to use the Installer Setup feature 1 To enter the Installer Setup press and hold the Information i key and the increase A and decrease W keys until the first number displays All display segments appear for approximately three seconds before the number displays See Fig 11 and 12 2 To advance to the next Installer Setup press the Information i key 3 To change a setting press the increase A or decrease W key 4 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 MICROELECTRONIC HEAT PUMP THERMOSTAT m Ht me Remote E Au x Room me bid D m0 mid TO AD xK L K orumi Repl Outdoor Batt D Wait W Heat Cool A ppp Far Emi HeatOffCool Auto Only 11 OnAut
6. etpoint can be Number can be set setpoint range set no higher than 90 F anywhere between 40 and stop 90 in 1 F increments 69 0961 4 6 MICROELECTRONIC HEAT PUMP THERMOSTAT INSTALLER 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 To start the system test CAUTION m Equipment Damage Hazard Minimum compressor off time is bypassed during the Installer System Test f NOTE Press and hold the increase A and decrease W Be aware that equipment damage can occur if the keys for three seconds to exit the system test compressor is cycled too quickly The system test times out after five minutes without any key presses Press and hold the increase A and decrease W keys at the same time until two zeros appear All segments of the Table 3 Installer System Tests LCD are displayed before the zeros appear AAAA 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 Em Ht Temporary Setting Remote Aux Ht i rn O Room ZO O1 Humid ror lar Ol at DE Ft Outdoor Repl Batt Wait W Heat Cool A ppp System Fan Em HeatOffCool Auto Only 11 OnAuto M4844 30 39 Cooling equipment can be turned on and off 40 49 Fan equipment can be turned on and off 60 69 System key or system switch position tes
7. follows Em Heat Emergency heat relay is automatically controlled by the thermostat The cooling system is off The compressor is de energized 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 as follows On Fan operates continuously Auto Equipment controls fan The system default setting is Heat and the fan default setting is Auto Use the keyboard to change to the desired settings See Fig 10 A CHECK LIGHT ON SELECT MODELS M10147 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 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 changing Review the Factory Setting column in Table 2 and if no changes are necessary go to the Installer System Test section Use the Install
8. g limits are 48 to 99 F 9 to 37 C Cannot set the heating higher or The setpoint temperature range Check Installer Setup mode numbers 34 and 35 and the cooling lower stops were configured reconfigure the setpoint stops Heating will not No power to the thermostat Check that C terminal is connected to the system come on transformer 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 at the equipment is in the Off position set to 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 a Available on select models continued 9 69 0961 4 MICROELECTRONIC HEAT PUMP THERMOSTAT TROUBLESHOOTING GUIDE LOEN Heating will not Thermostat minimum off time is Wait up to five minutes for the system to aCe ORI nee come on activated continued System selection is not set to Set system selection to Heat Heat O B terminal configured Check Installer Setup mode number 29 and reconfigure incorrectly correctly O or B terminal miswired Check system description to determine whether changeover should be energized in heat B or cool O Rewire if necessary Cooling will not No power to the thermostat Check that C terminal is
9. ion in operation after the call 90 seconds after the call for cooling for cool ends cool ends Notuses ewes OS Outdoor 24 No outdoor temperature 01 Outdoor temperature is temperature is displayed displayed Needs a display C7089B1000 Outdoor Sensor to operate uoa eea e O B terminal O B terminal is O B terminal is energized for energized in energized for reversing reversing valve in heating heating or valve in cooling cooling mwd joms fff Minimum off 5 minute minimum off Minimum number of minutes time for the time for the compressor 0 thru 5 the compressor will compressor be off between calls for the compressor Cooling 35 Cooling setpoint can be Number can be set setpoint range set no lower than 48 F anywhere between 48 and stop 99 in 1 F increments System On 36 LCD On symbol is Display is disabled usually display displayed when system set for 01 for a zoned is energized system Temperature 37 No difference in 01 Display adjusts to 1 F display displayed temperature higher than actual room adjustment and actual room temperature temperature 02 Display adjusts to 2 F higher than actual room 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 i 34 Heating s
10. layed Emergency Heat Test number is displayed NOTE Press system key again to repeat the System Key System Test FAN KEY SYSTEM TEST Fan 6s Fan On Test number is displayed Fan 69 Fan Off Test number is displayed System System EC System splayed Thermostat Information 1 Press the Information i key to access the thermo 3 Press the increase A key again to display the stat information software identification code Example 02 software ID code 2 M4864 pe Be M4866 2 Press the increase A key to display the production date code The first two large digits are the month 4 Press the increase A key again to display the and the third digit is the last digit of the year software revision number Example 001 Example 026 February 1996 revision number 1 M4865 M6791 69 0961 4 8 MICROELECTRONIC HEAT PUMP THERMOSTAT 5 Press the increase A key again to display the EEPROM identification code Example 222 CHECKOUT EEPROM ID 222 Outdoor Temperature Sensor Where Applicable Allow the outdoor temperature sensor to absorb 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 M4867 display at the thermostat 6 Press and hold the increase A and decrease
11. n recycled paper containing at least 10 post consumer paper fibers 69 0961 4 G H Rev 05 04 www honeywell com yourhome
12. o M4844 Fig 11 Display of all LCD segments INSTALLER SETUP NUMBER DISPLAY COLUMN 2 OF TABLE 2 FACTORY SETTING OR OTHER CHOICE DISPLAY COLUMN 3 OR 5 OF TABLE 2 M10105A Fig 12 Display of installer setup and setting NOTE Only configurable numbers are shown Table 2 Thermostat Installer Setup Options Installer Setup Number Press i key to change Heating cycle o5 sos Stage2 03 06 03 3 cph used for stage 1 T Changeover 12 01 Manual changeover T8511G only Factory Setting Other Choices Press A or W key to change Actual heat pump systems 06 6 cph used for conventional systems 09 9 cph used for electric heat systems Notused foomu H FPF b b gt F 00 Automatic changeover ma p e cS Ei Degree temperature display 14 Temperature is displayed in F Temperature is displayed in C Nouse smuis Fe a The cycle rate for the last stage of heat is adjustable with 6 as the factory setting continued 69 0961 4 MICROELECTRONIC HEAT PUMP THERMOSTAT Table 2 Thermostat Installer Setup Options Continued Installer Setup Number Other Choices Press i key Factory saa ress Aor Y key to eee Actual Extended fan 19 No extended fan Fan operation is extended operation in operation after the call 90 seconds after the call for heating for heat ends heat ends Extended fan No extended fan Fan operation is extended operat
13. on Location Install the thermostat about 5 ft 1 5m above the floor in an area with good air circulation at average temperature See Fig 1 Do not install the thermostat where it can be affected by drafts or dead spots behind doors and in corners _hotor 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 Mount tthermostat horizontally on the wall or on a 2 in x 4 in wiring box 1 Position and level the wallplate for appearance only The thermostat functions properly even when not level 69 0961 4 MICROELECTRONIC HEAT PUMP THERMOSTAT 5 FEET 1 5 METERS Fig 1 Typical location of thermostat WALL WIRES THROUGH WALL MOUNTING HOLES J X MOUNTING SCREWS M6530 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 as plaster or wood drill two 7 32 inch holes Gently tap anchors provided into the drilled holes until flush with the wall 69 0961 4 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 WIRING All wiring mus
14. t 70 79 Thermostat information displayed including date code and software versions Refer to Table 4 for descriptions of the specific tests Table 4 Installer System Test Options Fe e UU Press Number Description Heating Equipment System Test a 11 Stage one heat comes on The system fan is anso energized a 12 _ Stage two neat comes on Stage one heat and system fan remainon Py n swem SSCS v o Soens SSCS Emergency Heating Equipment System Test a 21 Emergency heat comes on System fan aso comes Py emergencyheatumso amp SSCS Cooling Equipment System Test f 30 Change from heating or emergency heating to cooling equipment system test a a Stage one cooling and system fan come on vy Stage one cool and system fan turn off a Available on select models continued 7 69 0961 4 MICROELECTRONIC HEAT PUMP THERMOSTAT Table 4 Installer System Test Options Continued es wee en ooo Press Number Description Fan Equipment System Test PT Change from cooing to fan equpmentaystemiest Pa a Fancomeson CSCS Py w fmm System Key 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 System Auto Test number is disp
15. t comply with local electrical codes and ordinances Refer to Fig 3 through 5 for typical hookups A letter code is located near each terminal for identification CAUTION Electrical Shock or Equipment Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installation 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 prevent drafts from affecting the thermostat AOUN MICROELECTRONIC HEAT PUMP THERMOSTAT THERMOSTAT THERMOSTAT OUTDOOR TEMPERATURE SENSOR OUTDOOR TEMPERATURE SENSOR COMPRESSOR CONTACTOR EQUIPMENT MONITOR COOL CHANGEOVER VALVE COOL HEAT CHANGEOVER VALVE A ti L1 HOT HOT L2 L2 HEAT CHANGEOVER VALVE A POWER SUPPLY PROVIDE DISCONNECT MEANS AND A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED OVERLOAD PROTECTION AS REQUIRED A AVAILABLE ON SELECT MODELS M4829 A AVAILABLE ON SELECT MODELS M4830 Fig 3 Typical hookup in heat pump application Fig 5 Typical hookup in heat pump application with emergency heat relay and O B terminal THERMOSTAT OUTDOOR TEMPERATURE SENSOR a
Download Pdf Manuals
Related Search