Honeywell CHRONOTHERM T8624C User's Manual
Contents
1. Ly L T FTIIT D GB 1 o Td T CYCLES TIME TEMP SYSTEM 1A 1B PER HOUR DISPLAY 2A 28 GRAVITY OUT 1 2 OUT 1 2 AIR WATER 1 TURN TO 1 TURN 1 24 HR IN OUT 1 2 IN OUT 1 2 WATER TO 1 TURN 12HR TO TURN GAS OIL IN IN WARM AIR FACTORY SETTING 6 oc IN ELECTRIC IN OUT 1 2 gj OUT 1 2 WARM AIR TO 1 TURN F TO 1 TURN A SCREWS 2A 2B AVAILABLE ON SOME MODELS ONLY M311A pear when thermostat is mounted back on the subbase IMPORTANT For proper thermostat operation al ways replace dead batteries with new alkaline batteries We recommend Energizer batteries If batteries are completely dead the display will go Fig 10 Battery placement POWER OUTAGES Backup batteries will hold the programming and keep the display on during most power outages Once the power is restored the system will resume normal opera tion After replacing the batteries reprogramming will be nec essary BATTERY PLACEMENT NOTE CORRE2. CHECK CIRCUIT DIAGRAM CONSULT FURNACE OR AIR CONDITIONER FURNACE OR AIR CONDITIONER INOPERATIVE INSTRUCTIONS PARTIAL DISPLAY INOPERATIVE THERMOSTAT REPLACE THERMOSTAT NO DISPLAY NO POWER TO THERMOSTAT CHECK THAT HEAT OR COOL SYSTEM POWER IS ON THERMOSTAT MOUNTED SEE INSTALLATION INSTRUCTIONS FOR CORRECT INCORRECTLY ON BASE MOUNTING PRESENT SETTING APPEARS NORMAL OPERATION THERMOSTAT TURNS ON INACCURATE AMESEMOSTATISAN RECOVERY gt HEATING COOLING EARLY TO MEET TEMPERATURE SETTING AT PROGRAMMED TIMES RECOVERY CAN BE ENDED BY PUSHING WARMER COOLER KEYS BOTH HEATING AND COOLING PRESS AND HOLD DOWN PRESENT SETTING KEY TO BOTH HEATING AND COOLING SETTINGS IN AUTO MODE NOT USING PRESENT SETTING KEY ALTERNATE BETWEEN HEATING AND COOLING SETTINGS THERMOSTAT TEMPERATURE NEEDS REPROGRAM THERMOSTAT TO MAKE PERMANENT TO BE ADJUSTED ON A REGULAR WARMER COOLER KEYS BEING CHANGE IN PROGRAM WARMER COOLER KEYS ARE BASIS USED TO ADJUST TEMPERATURE PROGRAM IS LOST DUE TO POWER OUTAGE OR DISPLAY GOES BLANK WHEN POWER IS TURNED OFF BATTERIES ARE INCORRECTLY INSTALLED TEMPORARY UNLESS PERIOD KEY IS PRESSED FIRST gt REMOVE AND REPLACE PER MARKINGS ON THERMOSTAT DISPLAY FLASHES WHILE PROGRAMMING t3 3 DISPLAY FLASHES DURING OPERATION BATTERIES ARE DEAD REP
3. e e HEAT The thermostat controls HEAT AUTO COOL OFF your heating system HEAT AUTO COOL OFF HEAT AUTO COOL OFF M3762 AUTO select models only The thermostat controls either your heating or cooling system depending on room temperature This completes the programming of the thermostat Opexating the Lhermostat If the thermostat is removed from the wall to program replace it following the procedure on page 5 TEMPORARILY CHANGING THE PROGRAM OFF Both the heating and cooling systems are off These features allow the program to be customized for those times when someone comes home early or stays up late or plans to be out for the evening To keep the current temperature through the SKIP Press and release The name one next program period NEXT of the period to be skipped will flash in the display until LEAVE RETURN the next regularly scheduled period starts To go back to the temperature of the previ fear Press and release The dis ba ous program period piedi play will show the name of mn the previous period and flash TEMPORARY until the next regularly scheduled period starts T8624C D OPERATING THE THERMOSTAT To temporarily raise or lower the tempera ja Press and hold until the de ture for the current period only WARMER sired temperature is reached The display will flash TEM until the next pro grammed time period starts EA Wit
4. Programming the Thermostat IMPORTANT With Adaptive Intelligent Recovery program the times for when the homeowner wants the home comfortable The thermostat will decide how early to begin the temperature changes STEP 1 SET THE CURRENT DAY AND TIME This thermostat can be programmed either on the wall or in hand SEE PAGE 5 TO FIND OUT HOW TO REMOVE THE THERMOSTAT FROM THE SUBBASE La DAY Always press the keys with fingertip or similar blunt tool Sharp instruments like a pen or pencil point can damage the key board w gt o NOTE Check the glossary page 22 for STEP 2 SET THE PROGRAM SCHEDULE AND HEATING TEMPERATURES Before Beginning The schedule form on page 22 provides the homeowner an opportunity to plan the schedule SET HEAT COOL Now Start by programming the WAKE time and temperature for weekdays DAY The thermostat requires a program for WAKE You can program LEAVE RE TURN and SLEEP or not as desired WHOA A E NOTE Some models will show 32 F instead of the current temperature indicating the thermostat is op erating on backup batteries until the thermostat is mounted on the wallplate and the system is powered definitions of unfamiliar words M5015 Press and release The display shows 1 00 PM MON M5016 Press and hold until the current day appears in the display M5017 Press and hold until the c
5. WAKE SLEEP 00120108 T8624C D PROGRAMMING THE THERMOSTAT temperature disappear from the display TUE WED THU Fl LEAVE Press and release The display shows LEAVE but no time or temperature Press and hold until the dis play shows the desired starting time M5023 Press and release The display shows RETURN but no time ge or temperature RETURN Press and hold until the dis play shows the desired start leen ing time Press and hold until the dis Tenten esp play shows the desired tem RETURN perature Program the SLEEP time and temperature if desired OPO rr Press and release The dis Cete s TIA play shows SLEEP and the sum pre programmed time and temperature MON TUE WED THU FRI Press and hold until the dis play shows the desired start ing time Set the SATURDAY sched ule Use the same procedure as for weekdays Press and release until SAT ap pears on the display Press WAKE LEAVE RE TURN or SLEEP to select the time period mes Use the AHEAD BACK keys Set the SUNDAY schedule Use the same procedure as for weekdays 68 0134 T8624C D PROGRAMMING THE THERMOSTAT If cooling temperatures are not being pro grammed skip Step 3 and press the RUN PROGRAM key STEP 3 SET THE COOLING TEMPERA TURES The program times are the same for both heating and cooling Only the cooling tem peratures need to
6. N HEAT 1 HEAT RELAY 1 EO HEAT RELAY 2 Eve SYSTEM SWITCH nt THERMOSTAT LOGIC CIRCUIT t COOLING COOL CONTACTOR HHO p FAN ES SUBBASE SWITCH LOGIC UTD FAN RELAY CIRCUIT 4 A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A FOR SINGLE TRANSFORMER SYSTEM JUMPER R AND RC gt RO L1 HOT 5 A COOLING TRANSFORMER NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN AND C FOR THERMOSTAT OPERATION DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION M5233 68 0134 T8624C D INSTALLATION Fig 7 T8624D 2 stage heat 2 stage cool thermostat with HEAT AUTO COOL OFF system and AUTO ON fan switching HEATING TRANSFORMER SYSTEM SWITCH THERMOSTAT LOGIC CIRCUIT SUBBASE LOGIC CONTROL CIRCUIT COOLING CONTACTOR 1 Ev FAN RELAY COOLING CONTACTOR 2 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED VAN FOR SINGLE TRANSFORMER SYSTEM JUMPER R AND RC L2 COOLING NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN TRANSFORMER R AND C FOR THERMOSTAT OPERATION A DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION Ma765 A AVAILABLE ON T8624D MODELS ONLY T8624C D INSTALLATION Fig 8 T8624D 2 stage heat 2 stage cool thermostat with HEAT OFF COOL system and AUTO ON fan switching auto fan on heat and cool co
7. Your local Honeywell Home and Building Control Sales Office check white pages of your phone directory 2 Home and Building Control Customer Satisfaction Honeywell Inc 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 612 951 1000 In Canada Honeywell Limited Honeywell Limitee 740 Ellesmere Road Scarborough Ontario M1P 2V9 International Sales and Service 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 T8624C D SPECIFICATIONS Fig 1 T8624 Subbase mounting dimensions in in mm 5 lt 316183 lt 43 121 M5181A 7 n 79 gt Fig 2 Typical thermostat keypad Honeywell rer OA 111 TEMPERATURE PERIOD TIME SET PRESENT DAY TIME mer M WARMER HOLD TEMP SET HEAT COOL SLEEP BA RETURN COOLER we HEAT AUTO COOL OFF ON FAN AUTO m2998 68 0134 T8624C D SELECTION APPLICATION The T8624 Thermostat uses the latest microelec tronic design and control technology to provide home and
8. service technician 4 Allow thermostat to warm to room temperature before operating 5 After installation is complete check out product operation as provided in these instructions IN CAUTION Disconnect power supply to prevent electrical shock or equipment damage LOCATION Install thermostat and subbase about 5 ft 1 5m above the floor in an area with good air circulation at room temperature Do not install thermostat where it may be affected by drafts or dead spots behind doors in corners or under cabinets 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 REPLACING AN EXISTING THERMOSTAT Turn off thermostat power at furnace or boiler A two transformer system may require turning off two switches T8624C D INSTALLATION Installation or disconnects Remove any existing wallplate or sub base from wall To avoid miswiring later label each wire color with the letter or number on the wiring termi nal as the wire is removed NEW INSTALLATION Run cable to a hole at the selected wall location for the thermostat and pull about 3 in 76 mm of wire through at least one conductor for each wiring terminal is recom mended Good service practice recommends selecting cable with one or two more conductors than the immedi ate application requires MOUNTING SUBBASE IMPORTANT B
9. CELING THE PROGRAM SETTINGS The thermostat requires time and tempera ture settings in the WAKE period but any of the others can be canceled Weekday Satur normal operation CHECKING THE PROGRAM TIMES AND TEMPERATURES normal operation CHECKING THE CURRENT TEMPERATURE SETTING Press a single key to compare current room temperature to the current temperature set ting at any time SLEEP LEAVE RETURN RUN gt 2 o D gt SLEEP LEAVE RETURN DAY PROGRAM 2 c z PRESENT SETTING PRESENT SETTING 20 day and Sunday settings are I canceled separately MEO ENS um Press and hold the desired pe ur riod key until the time and temperature clear from the display about three seconds Press and release to return to Check all the stored settings without affecting the per manent program CQ ZO rao X Z6 TUE WED THU Fl m au Press and release the desired period key The starttime and temperature setting will appear on the display M5054 Press and release to display the next daily time and tem perature for that period M5055 Press and release to return to M5056 Press and release The dis play will show the current temperature setting for sev eral seconds then revert to the room temperature M5057 To check the heating and cooling settings with the sys tem switch at the AUTO position press and hold down t
10. CT PLUS AND MINUS DIRECTION M 372A If the display goes off when power is lost either the backup batteries need to be replaced or are not installed When power is restored the display will flash 1 00 PM as a reminder to reprogram MOUNTING THE THERMOSTAT With system switch set to OFF hang the thermostat on the tabs at the top of the subbase Fig 11A Swing down and press on lower edge until thermostat snaps in place Fig 11B Open cover and tighten the captive mounting screws Fig 11C SETTING DAY AND TIME Restore 24V power to the thermostat When power is applied to the thermostat the display will read 1 00 PM and room temperature It will go off for a few seconds then begin to flash on and off Set present day and time Press Press to set the current day Each press of the DAY key advances the display one day Press TIME or If the display will not come on Check the mounting of the thermostat to the sub base If loose or misaligned remove thermostat and reinstall on the subbase making sure it is firmly attached Check to see that heat or cool system power is on Check voltage between R and C it should be 24 to 30 Vac to set the current time T8624C D INSTALLATION CHECKOUT Fig 11 Mounting thermostat on subbase M3764 HEATING Move the system switch to HEAT and the fan switch to AUTO Pre
11. Honeywell T8624C D 5 1 1 Day Programming Chronotherm III Fuel Saver Thermostats The T8624C D Chronotherm III Program mable Fuel Saver Thermostats provide auto matic control of multistage heating cooling sys tems and offer users the highest standard of comfort and convenience available with energy Savings E Different schedules may be selected for week days Saturday and Sunday Wi Can be programmed in hand with batteries in stalled or on wall to provide up to four tempera ture settings per day B Large digital clock liquid crystal display indi cates continuous time day current period and room temperature WB Adaptive Intelligent Recovery brings room tem perature to programmed temperature at pro grammed time maximizing comfort and energy savings E Temperature control program maintains tempera ture within 1 F of setpoint W Temporary program override available by using WARMER and COOLER keys SKIP next period key CHANGE to last period key E HOLD TEMP key provided for indefinite pro gram override vacation holiday W Installer self test and time delay override save installation time SYSTEM light emitting diode LED indicates system is energized W Models available with automatic or manual heat cool changeover Wi Batteries included provide power to maintain clock and memory during power failures W Switching subbase with wiring terminals included W Powered directly from co
12. LACE BATTERIES CHECK PROGRAMMING INSTRUCTIONS FOR CORRECT IMPROPER PROGRAM SEQUENCE PROGRAM SEQUENCE AUTOMATIC THERMOSTAT HEATING S OR COOLING TEMPERATURE CAN SET HEATING AND COOLING TEMPERATURES 3 F OR NOT BE SET CLOSER THAN 3 F i PROGRAMMING HAS BEEN LOST REPROGRAM ACCORDING PROGRAMMING INSTRUCTIONS BECAUSE OF A POWER OUTAGE 21 MAKE SURE BATTERIES ARE INSTALLED D G M5234A 68 0134 T8624C D GLOSSARY Troubleshooting Glossary Comfort temperature The temperature desired when active and occupying the home Energy saving temperature The lower heating or higher cooling temperature that allows savings on heating and cooling costs when aslee i Start Temperature Heating Cooling No program RETURN No program setup cooling temperature Period key One of the four keys WAKE LEAVE RETURN or SLEEP to check or program the start time and temperatue for a time period Preprogrammed schedule This is the schedule programmed into the thermostat at the factory It sets a night program that provides energy savings when homeowner sets no program or if personal program is lost for any reason The program which is the same for all days of the week is Program The times and temperatures homeowner sets to define the comfort and energy saving periods for each day sehe Recovery The time when the thermostat operates the heating or
13. T ap to select the time period M5042 Use the WARMER COOLER keys to set the temperature Set the cooling temperatures for the SUNDAY schedule Use the same procedure as for weekdays Press and hold until SUN ap pears on the display Press WAKE LEAVE RE TURN or SLEEP to select the time period M5043 68 0134 T8624C D PROGRAMMING THE THERMOSTAT OPERATING THE THERMOSTAT Use the WARMER COOLER keys to set the tempera SET THE SYSTEM AND FAN D S FAN ture SWITCHES ON THE SUB BASE PS PN You have completed programming the cooling tempera tures Depending on thermostat model some of the switch positions shown FAN Press and release to start the program may not be available on the ther mostat Note the positions provided Go to Step 4 on the subbase then set the ON AUTO switch es as desired Miren STEP 4 First set the fan switch FAN ON The fan runs continuously Use for improved air circulation during special occasions or for more effi cient electronic air cleaning FAN AUTO Normal setting for most homes The fan goes on and off with the air condi tioner in summer In winter the systems starts a few minutes after the furnace comes on It 91 79 HEAT AUTO COOL OFF stops a few minutes after the furnace goes off The fan starts and stops with the furnace in some electric heat systems and with the compressor in heat pump systems Then set the system switch C
14. TPOINT RANGE 45 F to 88 F 7 C to 31 C CALIBRATION Self calibrating thermostat and thermometer to 1 F SHIPPING TEMPERATURE 20 F to 120 F 29 C to 49 C CYCLES PER HOUR ADJUSTMENT Heating First stage of 2 stage heat models fixed at 3 cph Second stage of 2 stage heat models or heat stage of single stage heat models factory set at 6 cph field adjustable to 1 3 6 or 9 cph Cooling Factory set at 3 cph not field adjustable minimum off time of five minutes FINISH Beige matte with decorative brushed metal faceplate or Premier White DIMENSIONS Thermostat mounted on subbase 7 in 178 mm long 5 5 16 in 135 mm high 1 3 4 in 44 mm deep See Fig 1 for subbase dimensions TYPICAL KEYPAD See Fig 2 ACCESSORIES 586 Locking Cover TG512 Versaguard Universal Thermostat Guard TABLE 1 TRADELINE MODELS Changeover Application Thermostat Model Number T8624C 2 T8624D 2 T8624D 2 Stages Ordering Information When purchasing replacement and modernization products from your TRADELINE wholesaler or your distributor refer to the TRADELINE Catalog or price sheets for complete ordering number or specify 1 Model number 2 Number of heat and cool stages desired 3 System fan switching desired 4 Application If you have additional questions need further information or would like to comment on our products or services please write or phone 1
15. air conditioning equipment to return the home from the energy saving temperature to the comfort temperature The thermostat starts the recovery period early so the home will be at the comfort setting by the time the homeowner has chosen Saturday program schedule The schedule of WAKE LEAVE RETURN and SLEEP period start times and temperatures programmed to run on Saturdays Setback Reducing the temperature in the home for a set period in heating for energy savings The lower temperature is the energy saving temperature Setup Raising the temperature in the home for a set period in cooling for energy savings The higher temperature is the energy saving temperature Setpoint The thermostat temperature setting the homeowner selects The thermostat turns the heating or cooling equipment on and off to maintain this temperature at the thermostat location until another temperature setting setpoint goes into effect Sunday program schedule The schedule of WAKE LEAVE RETURN and SLEEP period start times and temperatures programmed to run on Sundays SYSTEM light This light glows whenever the thermostat is calling for heating or air conditioning Time period One of four program periods WAKE LEAVE RE TURN and SLEEP available with the thermostat One period begins when the previous program period ends WAKE The time period that the house is at a com fortable temperature while the family gets up and gets ready to leave fo
16. amage The shape of the terminal barrier permits insertion of straight or conventional wraparound wiring connections Either method is acceptable Push excess wire back into the hole and plug the hole with nonhardening caulk putty or insulation to prevent drafts from affecting thermostat operation NOTE Restrict wiring to the recessed area surrounding the terminals Fig 5 to assure thermostat subbase contact Refer to Figs 6 8 for typical hookups of subbase and thermostat ADJUSTING CYCLE RATE To customize the thermostat cycling performance to various types of heating equipment cycle rate adjust ment screws are provided on the back of the thermostat to provide optimum room temperature control NOTE Most applications will not require a change in cycle rate The room air temperature will normally vary slightly from the comfort temperature setting with the cycling of the furnace or air conditioner The heating cycle rate of this thermostat is factory set for gas oil warm air heating The cooling cycle rate is factory set and cannot be adjusted The heating cycle rate can be adjusted by turning one or both cycle rate adjustment screws located on the back of the thermostat In multistage heat systems the cycle rate adjustment applies to the highest stage of heat only Screws should be backed out about one half to one turn or be turned in until tight See Fig 9 TIME TEMPERATURE CONVERSION SOME MODELS The display rea
17. be programmed if the thermostat has already been programmed for heating To set times as the cooling temperatures are programmed use the TIME AHEAD and BACK keys as described in Step 2 If the times are changed for cooling they are also being changed for heating mum cooling setting is 73 F If a lower cooling temperature is shows LEAVE the time programmed for heating and 78 F SLEEP SET HEAT COOL p p LEAVE Wi RETURN Press and hold until SUN ap EAE pears on the display RETURN Press WAKE LEAVE RE TURN or SLEEP to select the time period Use the AHEAD BACK keys Wale COBLE re set the temperature This completes setting the program schedule and heat ing temperatures To set air conditioning go to Step 3 First program the WAKE tem m perature for weekdays we Press and release The display shows WAKE and the KI gt TO Li Lt AT 2340 M5031 time and temperature pro grammed for heating ELE SUN WAKE Press and release so COOL shows on the display along with the preprogrammed cool LO ing temperature in MON TUE WED THU FRI TOM Ore 5032 If display reads SAT or SUN press and hold until MON TUE WED THU FRI appears Pee TUT AM Press and hold until the dis play shows the desired temperature M5034 If the display blinks while holding down TEMPERA TURE WARMER or COOLER
18. building owners with the highest level of comfort available and optimal energy savings in a package that is easy to use and easy to live with The following section is a guide to selection and application of the best thermostat to meet individual needs PROGRAMMING Does the thermostat selected accommodate the cugtamer e daily cehadula lifactula or marl cehadula Daily Temperature Programming Selection 5 1 1 Mon Fri 4 heat and Sat Sun 4 cool nd d Device T8624C D T8621A C D 7 day each 4 heat a day different 4 coo T8600 01 02 03 5 1 1 Mon Fri 4 heat an Sat Sun 4 cool The choices are Selection A pplication Fan switching does fan come on automatically from thermostat on cooling only typical gas oil heating or on call for cool and heat typical electric heat with single speed fan Existing wiring Are there enough conductors to operate the equip ment and the thermostat Can a new cable be pulled IMPORTANT The T3624 requires an additional con ductor to transformer common to provide continu ous 24V power for thermostat operation SECURITY Does the thermostat selected provide access to Typical Access Application Device Free access to Home or T8624A C D programming owner occupied and adjustment commercial override building Public building Restricted access to device T8624 with TG512 Locking Guard or TG586A Locking Cover programmming and th
19. dout may be converted between 12 and 24 hour clock or C and F using screws 2A and 2B as indicated in Fig 9 FAN OPERATION OPTION SWITCH SELECT MODELS ONLY Select models include a fan operation option switch on the subbase that is visible before the thermostat is mounted on the subbase The switch should be in electric heat position for electric heating systems that do not have independent fan control INSTALLING BATTERIES Three AAA alkaline batteries are included to provide backup to prevent program loss in case of power outage Install batteries in back of thermostat as shown in Fig 10 Without battery backup the program will remain about 30 seconds in event of power loss IMPORTANT When batteries are first installed the display will flash 1 00 PM and 32 The tempera ture will stay at 32 F until the thermostat is powered from the system wiring When the batteries are low the display will flash REPL BAT Homeowner will have 20 30 seconds to install new batteries after removing old batteries from back of thermostat After 20 30 seconds it will be nec essary to reprogram REPL BAT indication will disap T8624C D INSTALLATION Fig 6 T8624C 2 stage heat 1 stage cool thermostat with HEAT AUTO COOL OFF system and AUTO ON fan switching HEATING TRANSFORMER 9 A AS HOT lt 12 lt POWER A ZL SUPPLY
20. e override features that will best suit the application The choices are Model not currently available to control multistage equipment IF NEW CONSTRUCTION APPLICATION CON SIDER Equipmenttype see manufacturer specifications Staging required System switching required Fan switching required w e Control wiring number of conductors require to operate equipment and thermostat ing IMPORTANT The T8624 requires an additional can ductor to transformer common to provide contigu ous 24V power for thermostat operation SINGLE STAGE HEAT PUMPS If home building owner has a single stage heat pump One option is to use a T8624C or D see Fig 8 The T8624C is a two stage heating one stage cool Y programmable thermostat The T8624D is a two stage heating two stage cooling programmable thermo stat What both thermostats have in common is separate and W2 first and second stage heat terminals In cases the W1 can be used for changeover in heat For single stage compressor applications both first ge heating and first stage cooling energized through Y terminal simply jumper Y1 and W1 Note that the recovery algorithm of the T8624 may IF RETROFIT REPLACEMENT APPLICATION the compressor to cycle on and off during recov CONSIDER Equipment requirements Staging heat stages cool stages System switching manual HEAT OFF CO b automatic HEAT AUTO COOL OFF gency heat for heat pump a
21. efore mounting set the system switch to the OFF position NOTE The subbase does not require leveling for proper operation but only for appearance Fig 3 Removing thermostat from subbase Remove thermostat from subbase Fig 3 Mount the subbase directly onto the wall with the screws and anchors included If drywall construction use plastic anchors Use the subbase as a template and with a pencil mark the two mounting screw positions Fig 4 Use 3 16 in bit to drill holes for anchors Gently tap anchors into holes until they are flush with the wall surface Thread wires through the center opening of the subbase Then mount the subbase using the two screws provided Gently tighten the screws level the top surface of the subbase and securely tighten the screws 68 0134 T8624C D INSTALLATION Fig 4 Mounting subbase on wall WALL ANCHORS 2 MOUNTING SCREWS 2 M846 SUBBASE Fig 5 Restrict wiring to recessed area surrounding terminals FOR STRAIGHT INSERTION STRIP 5 16 in 8 mm FOR WRAPAROUND y STRIP 7 16 in 11 mm RESTRICT WIRING TO THIS AREA FRONT VIEW OF TERMINAL AREA TOP SURFACE OF SUBBASE WIRING TO BE BELOW THIS SURFACE CROSS SECTIONAL VIEW OF TERMINAL AREA M 847 WIRING All wiring must comply with local electrical codes and ordinances Disconnect power before wiring to prevent electrical shock or equipment d
22. h the system switch at the AUTO position press and hold down the key to alter nate between heating and cool ing temperature settings for temporary override RUN Press and release to cancel any ofthe temporary settings M5047 PERMANENTLY CHANGING THE ca PROGRAM Press and release the desired eke period key If the schedule changes or a different tem perature is desired any setting can be up dated without affecting other program set tings Press and hold until the desired day schedule shows on the dis play Press and hold the Time or Tem perature keys until the display shows the desired new program gt a Press and release to return to normal operation MANUALLY OPERATING THE THERMOSTAT This feature is particularly useful when on vacation or other extended absences It does m Press and hold to change the not cancel the program temperature setting After a few seconds the display will show the current temperature re PRESENT SETTING Press and release to check the OAs temperature setting az m ze vO z DN PW Eb 340 Press and release n DN X 340 Press and hold down to alter nate between heating and cooling temperature settings AUN Teo Er DOM DL ULL PROGRAM Press and release to cancel E hold LEAVE 19 68 0134 T8624C D OPERATING THE THERMOSTAT NOTE Moving the system switch also can cels hold CAN
23. ntrol transformer re quiring an extra 24V wire to thermostat W Fan operation switch to select either independent or direct thermostat control of fan in heating included on back of select models CONTENTS Specifications ioo i e a ees 2 Ordering Information esses 2 Selection Application Installation tie Ch ck ut eoru mann Programming the Thermostat Operating the Thermostat Troubleshooting n_i C H 9 93 OHoneywell Inc 1993 Form Number 68 0134 T8624C D SPECIFICATIONS ORDERING INFORMATION Specifications IMPORTANT The specifications given in this publi cation do not include normal manufacturing toler ances Therefore this unit may not exactly match the listed specifications Also this product is tested under closely controlled conditions and some mi nor differences in performance can be expected if those conditions are changed TRADELINE MODELS TRADELINE models see Table 1 are selected and packaged to provide ease of stocking and handling and also maximum replacement value LIGHT EMITTING DIODE LED SYSTEM LED lights during thermostat ON cycle VOLTAGE RATING 15 to 30 Vac CURRENT RATING 1 6A maximum total per stage OPERATING HUMIDITY RANGE 5 to 90 percent relative humidity noncondensing OPERATING AMBIENT TEMPERATURE RANGE 40 F to 110 F 4 C to 43 C SE
24. nvertible to auto fan on cool only L1 HOT L2 A HEATING TRANSFORMER aN M A ANSA Le RS lt cy Le NS 1 N FAN OPERATION SWITCH wy 1 m STAGE 1 ELECTRIC ale HEAT RELAY HEAT 1 EN ELECTRIC eee HEAT 2 STAGE 2 SWITCH HEAT RELAY HEATING DAMPER OR COOL CHANGEOVER RELAY HEAT THERMOSTAT lt 8 LOGIC CIRCUIT OFF COOLING DAMPER OR CHANGEOVER RELAY STAGE 2 COOLING RELAY Ho hep COOL STAGE 1 4 COOLING RELAY lt SUBBASE LOGIC 4 CONTROL ND CIRCUIT FAN SWITCH FAN RELAY AUTO peer ON COOLING TRANSFORMER Li Hon POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD A FOR ELECTRIC HEAT APPLICATIONS AUTO FAN OPERATES WITH W1 PROTECTION AS REQUIRED AND Y1 USE ONLY ONE TRANSFORMER JUMPER R AND RC SET SWITCH TO ELECTRIC POSITION FOR GAS OR OIL APPLICATIONS OR ELECTRIC HEAT APPLICATIONS WHERE THE FAN OPERATION IS CONTROLLED INDEPENDENTLY OF NOMINAL 24 VAC POWER MUST BE PRESENT BETWEEN R AND C FOR THE THERMOSTAT AUTO FAN OPERATES WITH Y1 ONLY TWO THERMOSTAT OPERATION TRANSFORMERS MAY BE USED SET SWITCH TO NONELECTRIC POSITION lt DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION M1016D 9 68 0134 T8624C D INSTALLATION Fig 9 Cycle rate adjustment
25. o alternate between the heating and cooling settings During recovery from energy savings the setting dis played will not match the programmed setting This is because the thermostat gradually changes the tempera ture setting during recovery to provide most efficient use of the heating or cooling equipment SYMPTOM ROOM TEMPERATURE DISPLAY IS 32 F POSSIBLE CAUSE NO ac POWER TO THERMOSTAT FURNACE OR AIR CONDITIONER WON T OPERATE NO ac POWER TO THERMOSTAT T8624C TROUBLESHOOTIN ACTION CHECK POWER TO FURNACE OR AIR CONDITIONER ON OFF SWITCH FUSE OR CIRCUIT BREAKER LOOSE 24V CONNECTION AT THERMOSTAT AT FURNACE AIR CONDITIONER INCORRECT WIRING CHECK WIRING DIAGRAM CHECK POWER TO FURNACE OR AIR CONDITIONER ON OFF SWITCH FUSE OR CIRCUIT BREAKER LOOSE 24V CONNECTION AT THERMOSTAT AT FURNACE AIR CONDITIONER INCORRECT WIRING CHECK WIRING DIAGRAM THERMOSTAT INOPERATIVE CONDUCT SELF TEST SEE CHECKOUT ADJUST TEMPERATURE BY PUSHING WARMER PRESENT SETTING TOO LOW HIGH gt COOLER KEYS SYSTEM SWITCH ON TPERMOSIAT RESET THERMOSTAT SYSTEM SWITCH IN WRONG POSITION MINIMUM OFF TIMES IN THERMOSTAT IN OPERATION ON COOLING WAIT 5 10 MIN OR USE SELF TEST IN THERMOSTAT SEE CHECKOUT INCORRECT WIRING
26. pplication not pr vided on T8624 Although the cycle rate for the first stages of heat and cool are set for hot water systems the second stage of the 624 must be adjusted Turn the cycle rate adjustment ews to the hot water setting on both the T8624C and achieve the cycle rate appropriate for heat pumps Tf changeover is utilized in the cooling mode apply normally closed relay The above application should be used only on single stage heat pumps 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 author ity for instructions regarding recycling and the proper disposal of your old control If you have any questions call Honeywell Inc at 1 COMPATIBILITY The T8624 Thermostats will replace most heating cooling system thermostats As long as ac power is continuously available to the transformer the thermostat will be compatible with any low volt control system IMPORTANT The T8624 requires an additional con ductor to transformer common to provide continu ous 24V power for thermostat operation WHEN INSTALLING THIS PRODUCT 1 Read these instructions carefully Failure to follow them could damage the product or cause a hazardous condition 2 Check the ratings given on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced
27. r work or school This is the only period that must contain a time and temperature LEAVE The time period that the temperature can be set back winter or set up summer for energy RETURN The time period that the house is at a comfortable samipgmatbeedox arhi yfact tyties insted by ening bfifone bedtime SLEEP The time period that the temperature can be set back winter or set up summer for energy savings because the family is sleeping It can be set to start at the family s normal bedtime Often the SLEEP program is set only for the heating season so family members can sleep cool in the cooling season Weekday program schedule The schedule of WAKE LEAVE RETURN and SLEEP period start times and temperatures programmed to run Monday through Friday 23 68 0134 Honeywell Home and Building Control Honeywell Inc 1985 Douglas Drive North Golden Valley MN 55422 Printed in U S A Home and Building Control Honeywell Limited Honeywell Limit e 740 Ellesmere Road Scarborough Ontario MIP 2V9
28. ss WARMER key until the setting is about 10 F 6 C above room temperature Heating should start both stages if multistage and the fan should run may be a short delay on forced air systems Press COOLER key until the setting is about 10 F 6 C below room temperature The heating equipment should shut off followed by the fan NOTE On an AUTO changeover thermostat the cool ing temperature must be set at least 3 F 2 C above the heating temperature or display will flash COOLING IN CAUTION Do not operate cooling if outdoor temperature is below 50 F 10 C Refer to manufacturer recommendations NOTE When cooling setting is changed thermostat will wait up to five minutes before turning on the cooling equipment This delay is to protect the com pressor Checkout Move the system switch to COOL and the fan switch to AUTO Press COOLER key until the setting is about 10 F 6 C below room temperature The cooling equipment and fan should start both stages if multi stage Press WARMER key until the setting is about 10 F 6 C above room temperature The cooling equipment and fan equipment should stop NOTE On an AUTO changeover thermostat the heat ing temperature must be set at least 3 F 2 C below the cooling temperature or display will flash FAN Move the system switch to OFF and the fan switch to ON The fan should run continuously When the fan switch is in the AUTO position
29. the fan operates directly with the thermostat call for cooling and also with the 68 0134 T8624C D CHECKOUT System Press Look For This Look For This Response Switch This Key Position Key Down E Released EAO Am 5e gm AOOO her SUN MON TUE WED THU SAT COOL ONHEAT WAKE LEAVE RETURN SLEEP TEMPORARY A D M410C 00 CHECK See note A EACH POSITION Microprocessor mask no and PROGRAM System Press Look For This Response Switch This Down Key Released SET 1st stage heating and SYSTEM COOL or 1st stage cooling m Ist stage heating AUTO fan and SYSTEM and SYSTEM with fan in LED off AUTO ma stage cooling NOTE If single stage heating system press key twice SOON instead of four times once to turn on heating and 2nd stage cooling SYSTEM LED second time to turn off off lst stage cooling fan and SYSTEM LED off NOTE If single stage cooling system press key twice END SELF TEST instead of four times once to turn on cooling fan and SYSTEM LED second time to turn off continued O Cycle Rate Setting cph at 50 on time for stage 1 on 1 heat models First Digit stage 2 on 2 heat models T8624C D CHECKOUT Digit Changeover Position COOL AUTO or OFF Clock System Switch igi Degrees hrs Position x i 2 12 24 _ c gt F F F C C C C 13 68 0134 T8624C D PROGRAMMING THE THERMOSTAT
30. the setting limit has been reached If the thermostat can switch automatically between heating and cooling the cooling temperature must be at least three degrees higher than the corre sponding heating temperature For example if the heat ing setting is 70 F the mini desired the heating tempera ture first must be lowered ac cordingly Lt LOL MON TUE WED THU FRI LEAVE Zt Y au Program the LEAVE tempera M5035 ture if desired oe ZCL A MON TUE WED THU FI LENE Press and release The display OaM xau Press and hold until the dis play shows the desired tem MON TUE WED THU FRI RETURN 0 M5036 perature Press and release The display shows RE TURN the time programmed for heating ture if desired Press and release pears on the display Press WAKE LEAVE RETURN or SLEEP o Lr m m v o o o r m gt SLEEP DAY SLEEP COOLER RUN PROGRAM 5 g 5 gt D T8624C D PROGRAMMING THE THERMOSTAT Program the RETURN tem perature if desired M5038 a n d 78 F Press and hold until the display shows the desired tem perature M5040 Program the SLEEP tempera Press and hold until the dis play shows the desired tem perature M5041 LEAVE RETURN Set the cooling temperatures for the SATURDAY schedule Use the same procedure as for weekdays Press and hold until SA
31. urrent time appears in the display Be sure AM or PM appears as desired Press and release Note that the display shows WAKE and Se nee Pq the preprogrammed time and ie temperature If the display reads COOL re press and release to switch to ms HEAT If display reads SAT or SUN press and hold until MON TUE WED THU FRI appears Press and hold until the dis play shows the desired start ing time M5019 Press and hold until the dis play shows the desired tem MON TUE WED THU FRI perature ME If the display starts to blink while holding down TEM PERATURE WARMER or COOLER the setting limit has been reached If the thermostat can switch automati cally between heating and cooling the heating tempera ture must be at least three degrees below the air condi tioning temperature For example if the cooling setting is 75 F the maximum heating setting is 72 F Program the LEAVE time and tempera ture if desired NOTE The LEAVE RETURN or SLEEP program may be canceled by holding down the period key until the time and Press and hold until the display shows the desired temperature Program the RETURN time and tempera ture if desired Press and hold until the display shows the desired temperature to set the time and the WARMER COOLER keys to set the temperature LEAVE w gt o RETURN a b i SLEEP gt 2 2 E 2 E w gt o aK DAY
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