Honeywell T8624D User's Manual
Contents
1. 7 16 IN 11 MM M4826 Fig 4 Proper wiring technique Mounting Thermostat Wallplate The thermostat mounts on the wallplate after they are Honeywell installed 1 Engage tabs at the top of thermostat and wallplate See Fig 5 M15043 2 Press lower edge of case to latch NOTE To remove the thermostat from the wall first pull out Fig 5 Mounting thermostat on wallplate at the bottom of the thermostat then remove the top 5 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT SETTINGS Using Thermostat Keys The thermostat keys are used to set current day and time program times and setpoints for heating and cooling temporarily override program temperatures display present setting configure Installer Setup check System Test display outdoor temperature select models set the system operation set the fan operation See Fig 6 for the location of the keys System and Fan Settings The system default setting is Heat and the fan default setting is Auto Use the System and Fan keys or switches to change the settings See Fig 7 The fan settings can be set for each program period individually The system selection is for all the program periods SET WAKE TIMES AND SETPOINTS INCREASE TIME SETTING OR SCROLL FORWARD THROUGH INSTALLER SETUP AND SYSTEM TEST SET CURRENT DAY AND TIME RETURN TO NORMAL System settings control the thermostat operation2. F or Enter Installer Setup number 14 and reconfigure the display C display Bad thermostat location Relocate the thermostat Temperature settings The upper or lower temperature Check the temperature setpoints will not change limits were reached e Heating limits are 40 to 90 F 7 to 31 C Example Cannot set Cooling limits are 48 to 99 F 9 to 37 C F the heating higher or the cooling lower The setpoint temperature range Check Installer Setup numbers 34 and 35 and reconfigure the stops were configured setpoint stops Heating or cooling Heat or cool circuit is opening up Add resistor in parallel with load or install interface relay come on momentarily or becoming high impedance and shut off System on indicator Heating or cooling equipment is Verify operation of heating or cooling equipment in system test flame heat not operating snowflake cool is displayed but no warm or cool air is coming from the registers Heating will not No power to the thermostat e Check for 24 Vac between R and C terminals come on 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 wit
3. Display adjusts to 3 F lower than actual room temperature IMPORTANT l Setting Current Day and Time Review the settings to confirm that they match the system Press Run Program to exit the Installer Setup The thermostat has saved the Installer Setup 1 Press Set Current Day Time changes and initiated a reset in order to operate with these new settings Be sure to set the current day NOTE On initial power up or after an extended power and time immediately loss 1 00 pm flashes on the display until a key is pressed Set Current Day Time M10312 9 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 2 Press Day until the current day is displayed NOTE Sun Sunday Mon Monday Tue Tuesday Wed Wedhnesday Thu Thursday Fri Friday Sat Saturday ow M10313 3 Press Time or Time V until the current time is displayed NOTE Tapping the Set Current Day Time will change the time in one hour increments Time M10314 NOTE If the current time is Daylight Savings Time press Daylight Time until DST is displayed M10315 M10316 INSTALLER SYSTEM TEST Use the Installer System Test to check the thermostat operation Refer to Table 7 for a list of the available system tests To start the system test N CAUTION The minimum off time for compressors is bypassed during the Installer System Test Equipment damage can occur if the compressor is cycled too q
4. Sleep to select the 1 Press Hold Temp period the program will start Example Return thermostat will stop the Hold at the Return period start time M10333 M10339 2 Press increase A or decrease W key to change the setting if desired 4 Press increase A or decrease W key to adjust the temperature setting if desired Example Heat 54 heating equipment will operate when the room temperature is below 54 F M10334 3 Press Heat Cool Settings to change between heat and cool settings M10340 NOTE When the System is set for Auto both heat and cool settings are needed If the System is set for Heat only the Heat setpoint is needed or if Cool is selected only the Cool setpoint is needed M10336 4 Press increase A or decrease W key to adjust 5 Press Heat Cool Settings to change between heat and temperature settings cool settings M10336 15 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 6 Press increase A or decrease W key to adjust the temperature setting if desired Example Cool 84 cooling equipment will operate when the room temperature is above 84 F NOTE In this example the thermostat uses the Hold setting for eighteen days and returns to the daily programs at the Return period start time The temperature settings are heating 54 F and cooling 84 F Only the heating temperature is used because the System is set for Heat The thermostat will us
5. Time NOTE Opn initial power up or after an extended power loss 1 00 pm flashes on the display until a key is pressed Set Current Day Time 2 Press Day until the current day is displayed M10312 M10318 NOTE Sun Sunday Mon Monday Tue Tuesday Wed Wednesday Thu Thursday Fri Friday Sat Saturday 3 Press Time or Time V until the desired Wake time is displayed NOTE The program times are in fifteen minute intervals Example 8 00 8 15 8 30 M10313 3 Press Time or Time V until the current time M10919 is displayed NOTE Tapping the Set Current Day Time will change 4 Press increase A or decrease W key until the desired the time in one hour increments Wake temperature is displayed Time NOTE The setpoint temperature range is 40 to 90 F 7 to 31 C for heating and 45 to 99 F 9 to 37 C for cooling M10314 Setting bo NOTE Ifthe current time is Daylight Savings Time press Daylight Time until DST is displayed M10320 NOTE Press Fan to modify fan operation Auto means the fan will run only when the heating Daylight Time or cooling equipment is operating On means M10315 the fan will run continuously for the entire period M10316 13 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 5 Press Heat Cool Settings to switch to other system temperature setpoint NOTE The program times are the same for
6. as follows 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 Fan operates with equipment M15042 Fig 7 T8624D System and Fan key locations SET LEAVE TIMES AND SETPOINTS INCREASE TEMPERATURE SETTING OR SCROLL FORWARD THROUGH SET RETURN TIMES INSTALLER SETUP OPTIONS AND SET EOINTS DECREASE TEMPERATURE SETTING OR SCROLL LF BACKWARD THROUGH __ 1 INSTALLER SETUP OPTIONS DISPLAY INFORMATION SUCH AS PRESENT i SETTINGS AND OUTDOOR TEMPERATURE OPERATIONS TIMES AND ENTER CONN N S INDEFINITE D SET SLEEP OR TIMED HOLD MODE B A SET CURRENT OR PROGRAM DAY COPY ONE PROGRAMMED DAY TO ANOTHER DAY Wake Leave Return Sleep w OR O Te v ED Time OO nE E CHANGE BETWEEN DAYLIGHT SAVINGS CHANGE BETWEEN HEATING AND STANDARD TIME AND COOLING SETPOINTS SETPOINTS lt _ aT SELECT FAN System Fan OPERATION SELECT SYSTEM OPERATION DECREASE TIME SETTING OR SCROLL BACKWARD THROUGH INSTALLER SETUP AND SYSTEM TEST M10405A Fig 6 T8624D key locations and descriptions 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT NOTE Always press the
7. be set no closer than the no closer than 3 F chosen value 1 5 C 4 4 F 2 C 5 5 F 2 5 6 6 F 7 7 F 3 5 8 8 F 10 10 F 5 C a The cycle rate for the last stage of heat is adjustable with 6 cph being the factory setting continued 68 0166 1 8 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 6 Thermostat Installer Setup Options continued Installer Setup Number Press Other Choices Time key to Factory Setting Press A or W key to change Actual Minimum off time 5 minute minimum off Minimum number of minutes for the compressor time for the 0 thru 5 the compressor will compressor be off between calls for the compressor Temperature range Highest setpoint 40 to 89 Temperature range 1 F stops in heating heating can be set to increments heating setpoint can be set to Temperature range Lowest setpoint 46 to 99 Temperature range 1 F stops in cooling cooling can be set to increments cooling setpoint can be set to ee E a a T Temperature 37 No difference in 3 thru 3 1 Display adjusts to 1 F display adjustment displayed temperature higher than actual room and actual room temperature temperature 2 Display adjusts to 2 F higher than actual room temperature 3 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
8. both heating and cooling M10321 6 Press increase A or decrease W key until the other desired temperature setpoint is displayed M10322 7 Press Leave Return or Sleep and repeat steps 3 4 5 and 6 for programming the rest of the day The first day is now programmed IMPORTANT Repeat steps 1 through 7 for each day of the week that has a different program than the first day Refer to Copying a Day section to copy any program day to another 8 Press Run Program when all days are programmed M10323 Copying a Day NOTE The thermostat must be in the program mode to use the copy feature Go to step 2 if the thermostat is already in the program mode 1 Press Wake M10324 2 Press Day to select the day to be copied if different from the day displayed M10325 68 0166 1 3 Press Copy M10326 4 Press Day until the day to be copied to is displayed M10327 5 Press Copy NOTE donE will be displayed for two seconds and then the normal program display will be shown M10328 6 Repeat steps 2 through 5 for all the days desired 7 Press Run Program Clearing Program Period NOTE The thermostat must be in the program mode to use the clear feature Go to step 2 if the thermostat is already in the program mode 1 Press Wake Leave Return or Sleep M10329 2 Press Day until the desired day is displayed EA Start Time Ao Plu LIL M10330 3 Pres
9. longer need to carry separate models to get these features For C temperature display automatic or manual changeover electric or conventional heat fan operation adjustable heating cycle rate e Minimum off time for cooling compressors and heat pumps protects the equipment and extends the equipment life Easy installation setup and system test saves installer time and increases productivity e System test simplifies troubleshooting and saves time by overriding the time delays Adaptive Intelligent Recovery control brings the room temperature to temperature setpoint at the programmed time maximizing comfort and energy savings e Setpoints are permanently held in memory no batteries used and retained during power outages for increased installer and homeowner convenience Universal Versaguard Thermostat guards available for added security Contents Generaler enere e Aae EE eaa E EASE 1 FOATUNGS oiid a aeee eee ariii 1 Specifications 2 Ordering Information 2 Installation 2a c scesesecigleveceeteccenael sees scceeeecceenpatlacesaenestenteemetcs 3 WiO e E E 4 SEMINO es e e a r 6 Installer Setups siirsin age te 7 Installer System Test eceesesseeeeeeeeseeeeeeeeeeeeeeeeeaeeeneetens 10 PLOQFAMIMING ceeeeeeeeneeeeeeeeteneeeeeeeeesesneeetsaeeeeeneeeeseneeensaes 12 OD CMALOM c2s ssepesces sets T T 16 Troubleshooting Guide ccccsccecseeeceeeeeeeeen
10. 8624D1055 York logo T8624D2004 Configure changeover to auto in Installer Setup 12 T8624D1063 Trane Premier White color T8624D2004 Wiring differences old new B C jumper R to Re a color 19 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT WIRING DIAGRAM FIG 14 THERMOSTAT COOLING TRANSFORMER OUTDOOR SENSOR HEATING TRANSFORMER A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A ONE TRANSFORMER SYSTEM A CAN BE USED FOR CHANGEOVER VALVE ON HEAT M11309 PUMP SYSTEMS Fig 14 Typical hookup of T8624D in multistage system Home and Building Control Honeywell Inc Honeywell Plaza P O Box 524 Minneapolis MN 55408 0524 Honeywell Latin American Region 480 Sawgrass Corporate Parkway Suite 200 Sunrise FL 33325 Home and Building Control Honeywell Limited Honeywell Limit e 155 Gordon Baker Road North York Ontario M2H 3N7 Honeywell Europe S A 3 Avenue du Bourget 1140 Brussels Belgium Honeywell Asia Pacific Inc Room 3213 3225 Sun Hung Kai Centre No 30 Harbour Road Wanchai Hong Kong Honeywell 68 0166 1 J H Rev 10 97 Printed in U S A on recycled amp paper containing at least 10 post consumer paper fibers Helping You Control Your World www honeywell com yourhome
11. Honeywell T8624D Chronotherm IV Deluxe Programmable Thermostat a DST Fan BIS APPLICATION The T8624D Chronotherm IV Deluxe Programmable Thermostat provides electronic control of 24 Vac multistage heating and cooling systems FEATURES e Full seven day program capability different schedules and temperature setpoints may be selected for everyday to match the homeowner s flexible schedule e Copy key makes programming easier and faster for the installer and homeowner Daylight Savings Time DST key for quick change in and out of Daylight Savings Time e Models available with programmable fan operation for added homeowner comfort e Easy temporary temperature setpoint changes for current period vacation hold 1 to 255 days or indefinite hold adds to the homeowner comfort and energy savings Most frequently used keys are located by the Liquid Crystal Display LCD for quick and easy access to information Attractive styling complements any decor to the homeowner s delight e Back lighting the large display makes the LCD very easy to read U S Registered Trademark Copyright 1997 Honeywell Inc All Rights Reserved PRODUCT DATA e Models available with outdoor temperature sensor capability for homeowner convenience The sensor is also more accurate than a thermometer e Configurable features allows one model to be used to replace many different models less inventory no
12. ING All wiring must comply with local electrical codes and ordinances Follow equipment manufacturer wiring instructions when available Refer to Fig 14 for typical hookup A letter code is located near each terminal for identification Refer to Table 4 for terminal designations A CAUTION Disconnect power before wiring to prevent electrical shock or equipment damage 1 Loosen the terminal screws on the wallplate and connect the system wires See Fig 4 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 Pon T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 4 Terminal Designations and Descriptions Standard Alternate Terminal Terminal Designations Designations Typical Connection Terminal Type fe Healdamper or changeover vane Ouiaut 24V powered contact fo dB GRE Common dwt CPCS fo R Cool damper orchangeovervave Output 24V powered contact onor Outdoor temperature sensor 670806 mou M PR 2av yt orheating tansformer Input OOOO faci d eV cooingrranatormer input Si SSCS a Some OEM models label the terminal for transformer common B A ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE A ia FOR STRAIGHT INSERTION STRIP FOR WRAPAROUND INSERTION STRIP 5 16 IN 8 MM
13. INT PROPORTIONAL COOL CONTROL POINT P 1 CONTROL POINT r P l CONTROL POINT Sj TEMPERATURE L PROPORTIONAL HEAT CONTROL POINT THERMOSTAT HEAT SETPOINT HEATING COOLING gt 100 50 100 M4414 50 0 PERCENT LOAD Fig 12 Proportional temperature control versus P l temperature control T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Operation Sequence The thermostat energizes specific terminals depending what the Fan and System are set to The LCD will display the time room temperature system and fan selection Symbols will be displayed when the heating cooling or fan is energized See Table 10 for specific information NOTE Not all the thermostat models have all the terminals listed in the Energize column Table 10 Multistage System Sequence of Operation e oan on em os Auto Off None None None ee Fe cual Cool or Stage 1 O Gand Y1 Auto Coolor Stage 2 O G Y1 and e e o Auto Heator Stage 1 B G and W1 Auto Heator Stage 2 B G2 w1 D y Auto heating and W2 and a Gis energized and fan symbol is displayed on duel fuel models when set for electric heat b Based on last piece of equipment called cooling O or heating B and Installer Setup selection Equipment Protection As part of the operational sequence the thermostat microprocessor also incorporates minimum off time for all heating and cooling stages Usin
14. NOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 6 Thermostat Installer Setup Options Installer Setup Number Press Other Choices Time key to Factory Setting Press A or VW key to change Actual ea Se a ae ae a Heating cycle 3 3 cph used for steam rate systems 6 6 cph factory setting for all stages of system 9 9 cph used for electric poset setting 12 Manual changeover or 2 0 Auto changeover adjustment 2 Fixed auto changeover Adaptive Intelligent Adaptive Intelligent Conventional recovery Recovery control Recovery control is system starts recovery at activated system programmed time starts early so setpoint is reached by start of program period Degree tempera Temperature is 1 Temperature is displayed ture display displayed in F in C wea A o e aS a o a JRC K E format SNE F 12 hour clock format Oai o 24 hour clock format Extended fan No extended fan Fan operation is extended operation in heating operation after the call 90 seconds after the call for for heat ends heat ends Extended fan No extended fan Fan operation is extended operation in cooling operation after the call 90 seconds after the call for for cool ends cool ends Outdoor 24 No outdoor Outdoor temperature is temperature display temperature is displayed Needs a models with OT displayed C7089B1000 Outdoor Sensor T to operate Nosed o Heating and cooling 4 thru 10 Heating and cooling setpoints setpoints can be set can
15. circulation at average temperature See Fig 2 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 The thermostat can be mounted horizontally on the wall or on a 2 in x 4 in wiring box Position wallplate 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 will function properly even when not level 2 Use a pencil to mark the mounting holes See Fig 3 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 drill two 7 32 inch 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 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 1 5 METERS 5 FEET M10106 Fig 2 Typical location of thermostat WALL WIRES THROUGH WALL WALL ANCHORS 2 MOUNTING HOLES X MOUNTING SCREWS M10822 Fig 3 Mounting the wallplate 68 0166 1 WIR
16. cy 1 F 0 5 C Setpoint Range Heating 40 F to 90 F 7 C to 31 C Cooling 48 F to 99 F 9 C to 37 C Differential 3 F 1 5 C Default Settings see Table 3 Table 3 Default Setpoints Heat Cool Period Time Setpoint Setpoint Wake 6 00 AM 70 F 78 F Auto 21 C 25 5 C Leave 8 00 AM 62 F 85 F 16 5 C 29 5 C Auto Auto Return 6 00 PM 70 F 78 F 21 C 25 5 C Sleep 10 00 PM 62 F 82 F Auto 16 5 C 28 C Minimum Stage Operation Time Minimum On Heat and Cool select models factory setting 2 minutes option 0 minutes Minimum Off Cool and Heat Pump factory setting 2 minutes option 0 minutes Humidity Ratings 5 to 90 RH noncondensing Clock Accuracy 1 minute per month Finish Taupe or Premier White color When purchasing replacement and modernization products from your TRADELINE wholesaler or distributor refer to the TRADELINE Catalog or price sheets for complete ordering number If you have additional questions need further information or would like to comment on our products or services please write or phone 1 Your local Home and Building Control Sales Office check white pages of your phone directory 2 Home and Building Control Customer Relations Honeywell 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 4Z9 International Sales and S
17. e both the heating and cooling temperature settings when the System is set to Auto IMPORTANT If the Hold needs to be canceled before the designated time press Run Program to return to the program Setting Temporary Fan Operation Press Fan until the desired fan operation is selected This fan setting will be in effect until the next regularly scheduled period starts Using Daylight Savings Time Feature This feature allows you to change in and out of Daylight Savings Time with a key press When Daylight Time is pressed in the fall the time will go back one hour In the spring the time will go ahead one hour and the display will show DST See Setting the Current Day and Time section for initial setting instructions NOTE Pressing Daylight Time more than once within a five minute period will scroll you through various time options example one hour earlier or later with or without DST Pressing Daylight Time six times in a five minute period will return you to your original settings BIG amp From Fan 1 Auto M10341 Displaying the Outdoor Temperature If your thermostat is equipped with an outdoor sensor you can check the temperature at the sensor by pressing i once SE Outdoor M10342 68 0166 1 16 OPERATION P I Control The thermostat microprocessor based control requires that the user understands temperature control and thermostat performance A conventional electromechanica
18. eeeesseeessseees 18 Cross Relerence scierie ieii i is 19 Wiring DiaQrarinscssscescccteestscegenvactetadiscestcedeneieeasstetesicteetanaeenes 20 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT SPECIFICATIONS Important The specifications given in this publication do not include normal manufacturing tolerances Therefore this unit might not exactly match the listed specifications This product is tested and calibrated under closely controlled conditions and some minor differences in performance can be expected if those conditions are changed Thermostat Model T8624D Thermostats provide features listed in Table 1 Table 1 Thermostat Features System Fan Changeover Selection Selection Comments Heat Off Cool Auto Automatic On Auto System and fan selections are done by keyboard Electrical Rating Nominal Range 24 Vac 50 60 Hz 20 to 30 Vac 50 60 Hz Batteries No batteries required Loss of Power The thermostat will maintain programmed times and temperatures for the life of the product The clock and day information is retained for a minimum of thirty minutes System Current Load Ratings 6 VA maximum at 30 Vac 50 60 Hz Output Relay Draw See Table 2 Table 2 Maximum Amps at 30 Vac Running A trash A ORDERING INFORMATION Temperature Ratings Operating Ambient 40 F to 110 F 4 C to 43 C Shipping 30 F to 150 F 34 C to 65 C Display Accura
19. ervice 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 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Dimensions See Fig 1 ja 3 5 8 92 M10359 Fig 1 Dimensions of thermostat in in mm Mounting Means The thermostat mounts on a wallplate The wallplate mounts horizontally on a wall or outlet box with two no 6 x 32 screws included Accessories C7089B Outdoor Temperature Sensors 69 1020 Universal Versaguard Thermostat guards RECYCLING NOTICE If this control is replacing a control that contains mercury in a sealed tube do not place 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 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 5 ft 1 5m above the floor in an area with good air
20. g the minimum off time assures that rapid cycling of equipment does not occur which extends equipment life Minimum off times are set in the Installer Setup Thermostat Operation Startup When power to the thermostat is turned on a startup and initialization program begins The startup occurs only on initial powerup After total loss of power for an extended period the current time and day may need to be set but the user program is held See Table 11 for the default values NOTE Immediately following initialization the user can enter new setpoints to be used in place of the default values 17 Table 11 Default Time Setpoint and Fan Settings Heat Cool Period Time Setpoint Setpoint Wake 6 00AM 70 F 21 C 78 F Auto 25 5 C Leave 8 00 AM 62 F 85 F Auto 16 5 C 29 5 C Return 6 00 PM 70 F 21 C 78 F Auto 25 5 C Sleep 10 00 PM 62 F 82 F Auto 16 5 C 28 C Adaptive Intelligent Recovery Feature Adaptive Intelligent Recovery control assures that the comfort setting is achieved at the programmed time regardless of weather conditions Conventional recovery however starts recovery at the beginning of the programmed time period and used the equipment to achieve the comfort settings as soon as possible Adaptive Intelligent Recovery control calculates the recovery ramp based on the number of degrees away from the desired setpoint previous equipment performance and weather history
21. h troubleshooting Thermostat minimum off time is Wait up to five minutes for the system to respond activated System selection is not set to Set system selection to Heat Heat Heating setpoint is below room Check heating setpoint Set heating setpoint to desired temperature temperature continued 68 0166 1 18 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 12 Troubleshooting Information continued Cooling will not No power to the thermostat e Check for 24 Vac between R and C come on 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 minimum off time is e Wait up to five minutes for the system to respond activated e Enter Installer Setup number 33 Reconfigure minimum off time if required System selection is not set to Set system selection to Cool Cool Cool setpoint is above room Check e oe eee setpoint Set cooling setpoint to desired temperature e oe eee Outdoor temperature Option not activated Enter Installer Setup number 24 and set to 1 Thermostat must not displayed have OT terminals and a C7089B1000 in
22. keys with your fingertip or similar blunt tool Sharp instruments like a pen or pencil point can damage the keyboard Temperature Settings Refer to Table 5 for the default program If the daytime energy savings period is not used press the period key Leave or Return until the time is blank The fan setting feature is available on select thermostat models See Programming Section for complete instructions on changing the program Table 5 Default Program Settings Heat Cool Period Time Setpoint Setpoint Wake 6 00 AM 70 F 78 F Auto 21 C 25 5 C Leave 8 00 AM 62 F 85 F Auto 16 5 C 29 5 C 78 F Auto 25 5 C Return 6 00 PM 70 F 21 C Sleep 10 00 PM 62 F 82 F Auto 16 5 C 28 C INSTALLER SETUP NOTE For most applications the thermostat factory settings will not need to be changed Review the factory settings in Table 6 and if no changes are necessary go to the Installer System Test section The Installer Setup is used to customize the thermostat to specific systems Some of the options include temperature display changeover and outdoor temperature display Installer Setup numbers are listed in Table 6 The table includes all the configuration options and the factory settings for the thermostat 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 W keys un
23. l or electronic thermostat does not control temperature precisely at setpoint Typically there is an offset droop in the control point as the system load changes This is a phenomenon that most people in the industry know and accept Many factors contribute to offset including switch differential thermal lag overshoot cycle rates and system load The thermostat microprocessor simultaneously gathers compares and computes data Using this data it controls a wide variety of functions The special proprietary algorithm program in the thermostat eliminates the factors causing offset This makes temperature control more accurate than the conventional electromechanical or electronic thermostats The temperature control algorithm is called proportional plus integral P l control The thermostat sensor located on the thermostat or remote senses the current space temperature The proportional error is calculated by comparing the sensed temperature to the programmed setpoint The deviation from the setpoint is the proportional error The thermostat also determines integral error which is a deviation based on the length of error time The sum of the two errors is the P l error The cycle rate used to reach and maintain the setpoint temperature is computed using the P I The addition of the integral error is what differentiates the thermostat from many other electronic and electromechanical thermostats See Fig 12 THERMOSTAT COOL SETPO
24. rgy efficient operation for extended The keyboard is located behind the thermostat cover with periods of time three frequently used keys by the display The thermostat display shows day time program period temperature system Before starting the programming procedure use Table 9 to and fan operation selection organize the program schedule The factory preprogrammed time temperature and fan settings are shown in brackets If a The thermostat can be set for four times and up to daytime energy savings period is not used press the period eight temperatures for each day of the week 28 key Leave or Return until the time is blank The fan setting independent time and 56 temperature settings The feature is available on select thermostat models Table 9 Default Time Setpoints and Fan Settings Monday TOF SEO eS 2057C 52 F 65 C Tuesday GF WESC Wednesday BZF ESCH Thursday GF WESC Friday FESO Saturday 62 F 16 5 C Sunday TOF FO Te 255C 2 ESO ea OH 68 0166 1 12 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Setting the Current Day and Time Programming the First Day Start by programming the Wake time and temperature and IMPORTANT fan operation on select models for any one day Always press the keys with your fingertip or similar 1 P Wak blunt tool Sharp instruments like pens and pencil pee AASS points can damage the keyboard 1 Press Set Current Day
25. s Leave Return or Sleep until the start time and temperature setting are cleared approximately 3 seconds NOTE Wake cannot be cleared M10331 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT 4 Repeat steps 2 and 3 for all the periods to be cleared NOTE The display changes from the setpoint to the room temperature after approximately 5 Press Run Program 3 seconds Setting Temporary Temperatures 5 Press Run Program to cancel the Hold and to return to the program Changing Temperature Setting Until the Next Program Period Changing Temperature Setting Until a Designated Press increase A or decrease W key until the desired Day and Period temperature setpoint is displayed 4 Press Hold Temp twice NOTE If V or A appear under the temperature display it means that both the heating and cooling setpoints are being adjusted Tapping the key will change both the heat and cool setpoints by one degree Press i after the desired setpoint is reached to check the setpoints M10337 2 Press Time A or Time V until the desired number of days is displayed 1 to 256 days Example 18 Hold will override the daily programs for 18 days M10332 Time NOTE The temporary temperature setting is displayed for approximately 3 seconds The setting is canceled when the next period starts or when Run Program oo is pressed M10338 Changing Temperature Setting Indefinitely 3 Press Wake Leave Return or
26. stalled Outdoor temperature Outdoor sensor is connected Refer to C7089B1000 installation instructions and check wiring display is incorrect incorrectly between the thermostat and sensor Replace sensor with C7089B1000 sensor a Available on select models CROSS REFERENCE Refer to Table 13 for thermostat cross referencing information Table 13 Thermostat Cross Reference Information TRADELINE Model Number Description Replacement T8624C Two stage heat and two stage cool conventional thermostat powered direct from 24 Vac transformer manual changeover system switch HEAT OFF COOL AUTO fan switch ON AUTO O and B terminals T8624C1008 Trane Premier White color part no T8624D2004 Wiring differences old new B C TAYSTAT302A jumper R to Rc taupe color T8624D Two stage heat and two stage cool conventional thermostat powered direct from 24 Vac transformer automatic changeover system switch HEAT OFF COOL AUTO fan switch ON AUTO O and B terminals T8624D1006 TRADELINE thermostat Honeywell logo T8624D2004 Configure changeover to auto in Installer Setup 12 T8624D1014 Carrier Weathermaker T8624D2004 Configure changeover to auto in Installer Setup 12 T8624D1022 Carrier Zone Perfect T8624D2004 Configure changeover to auto in Installer Setup 12 T8624D1030 TRADELINE thermostat Honeywell logo T8624D2004 Configure changeover to auto in Premier White color Installer Setup 12 taupe color T
27. tage one heat and system fan turn off Cooling Equipment System Test Fan turns off Key Operation System Test Change from fan to key operation system test NOTE Press any key and the displayed numbers will 3 Press the increase A key again to display the software change Press Time V to go to the previous test identification code Example 02 software ID code 2 and Time to go to the next test The Run Program key will not exit from this test To exit go to a different test and press Run Program Ie Hi Co Thermostat Information 1 Press the Time key to access the thermostat information 1 R o o N gt 4 Press the increase A key again to display the software revision number Example 001 Revision number 1 73 BOI R o E 2 Press the increase A key to display the production M10229 date code The first two large digits are the month and the third digit is the last digit of the year Example 5 Press the increase A key again to display the 027 February 1997 EEPROM identification code Example 314 EEPROM ID 314 Wo det Y J M10351 N o oO gt 6 Press the Run Program key to exit the system test The system test times out after four minutes without any key presses 11 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT P ROG R AM MING A and V keys provide quick temporary temperature changes to increase comfort The Hold Temp key provides ene
28. til the first number is displayed All display segments appear for approximately three seconds before the number is displayed See Fig 8 and 9 To advance to the next Installer Setup press the Time key To change a setting use the increase A or decrease W key To scroll the Installer Setup numbers backwards press the Time V key To exit the Installer Setup press Run Program SAE Start Time APANE Temporary Setting Enrg Hold torm m lam rm T o S Hajmi n j ya ci cA sohiumid MonTueWedThuFriSatSun Wa rae ated rnSleep V Heat Cool A Outdoor In cae Auto Repl Batt Syste Fan Em Heat QOTiCoolseAuto Wait Soa 7e gt gt bOn Auto M10345 Fig 8 Display of all the segments of the LCD M10404 INSTALLER SETUP FACTORY SETTING NUMBER DISPLAY OR OTHER CHOICE COLUMN 2 DISPLAY COLUMN 3 OF TABLE 6 OR 5 OF TABLE 6 Fig 9 Display of Installer Setup number and setting A CAUTION Electric heat systems must be configured to 1 in Installer Setup number 2 to prevent equipment damage caused by the system running without the fan IMPORTANT Only configurable numbers are shown on the device Example If thermostat does not have a system key Installer Setup Number 12 will not be displayed Review Table 6 factory settings and mark any desired changes in the Actual Settings column When Installer Setup is complete review the settings to confirm that they match the system 68 0166 1 T8624D CHRO
29. to initiate recovery at the optimal time to achieve the comfort setting at the desired time Once the recovery ramp is intersected the setpoint changes from the setback setpoint to the comfort setpoint This change snaps on both stages of the equipment and runs both stages until the setpoint is reached If the setpoint is reached too early or too late the ramp is adjusted for the next days recovery See Fig 13 70 F om SETPOINT TEMPERATURE ACTUAL TEMPERATURE 60 F SLEEP WAKE M6185A HEATING MODE Fig 13 Gradual temperature change in recovery 68 0166 1 T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT TROUBLESHOOTING GUIDE Refer to Table 12 for troubleshooting information Table 12 Troubleshooting Information Display will not Thermostat is not being powered e Check for 24 Vac between R and C terminals come on 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 Temperature display Room temperature display has Enter Installer Setup number 37 and reconfigure the display is incorrect been reconfigured Thermostat is configured for
30. uickly Press and hold the increase A and W decrease keys at the same time until 10 appears All segments of the display are displayed for three seconds before 10 appears See Fig 10 and 11 68 0166 1 10 SAE Start Time APANG Temporary Setting Enrg Hold Oy Cid i im me ae Cite pu ft m im re MonTueWedThuFriSatSun ee Sys Em Feat DOCO Aut Wait oa 72 gt gt bOnAuto M10345 v i l l A Outdoor In agro Auto Repl Batt Fig 10 Display of all the segments of the LCD TEST NUMBER M10257A Fig 11 Display of test number Table 7 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 Oto Keyboard keys test 60 19 70 79 Thermostat information including date code and software versions are displayed Refer to Table 8 for the directions and results of the specific tests NOTE Press Time to advance to the next test and Time V to go to the previous test Press Run Program to exit the system test T8624D CHRONOTHERM IV DELUXE PROGRAMMABLE THERMOSTAT Table 8 Installer System Test Options Press Number Description Heating EquipmentSystemTest SSCS Pa 1 _ Stage one heat comes on The system fan is also energized Pa 12 Siage two heat comes on Stage one heat and system fanremainon Stage two heat turns off S
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