Honeywell CHRONOTHERM III T8621A User Manual Download | Manualshive

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Summary of Contents for CHRONOTHERM III T8621A

Page 1: ... time delay override save installation time SYSTEM light emitting diode LED indicates system is energized Models available with automatic or manual heat cool changeover Batteries included provide power to maintain clock and memory during power failures Switchingsubbasewithwiringterminalsincluded Powered directly from control transformer requir ing an extra 24V wire to thermostat Fan operation swit...

Page 2: ...ELINE MODEL Thermostat Model Stages Changeover Switching Number Heat Cool Type System Fan Application T8621D 2 2 Manual HEAT OFF COOL ON AUTO Multistage Ordering Information When purchasing replacement and modernization products from your TRADELINE wholesaler or distributor refer to the TRADELINE Catalog or price sheets for complete ordering number or specify 1 Model number SUPER TRADELINE if desi...

Page 3: ...9 Cto 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 adjustable for other systems Cooling Factory set at 3 cph not field adjustable minimum off time of five minutes FINISH Beigematte with decorative brushed metal face plate DIMENSIONS Thermostat mounted on s...

Page 4: ... 31 32 50 41 64 16 3 8 1 19 64 9 64 1 2 8 4 DIA 13 35 1 25 BACK Fig 3 Typical thermostat keypad SYSTEM RUN PROGRAM PERIOD TIME TEMPERATURE PRESENT SETTING SKIP NEXT PERIOD CHANGE TO LAST PERIOD SET PRESENT DAY TIME HOLD TEMP DAY SET HEAT COOL CANCEL PERIOD COPY FROM AHEAD WARMER BACK COOLER M5360 WED MIDDAY AM HEAT ON HEAT OFF COOL ON AUTO FAN ROOM COPY TO ...

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Page 10: ... TRANSFORMER R C W1 W2 HEAT RELAY 1 HEAT RELAY 2 COOLING TRANSFORMER Y1 G RC COOLING CONTACTOR FAN RELAY HEAT 1 HIGH LIMIT HIGH LIMIT L1 HOT L2 HEAT AUTO OFF SYSTEM SWITCH AUTO ON FAN SWITCH COOL HEAT 2 2 1 COOL L1 HOT L2 1 2 1 2 3 4 3 4 SUBBASE LOGIC CONTROL CIRCUIT POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED FOR SINGLE TRANSFORMER SYSTEM JUMPER R AND RC POWER SUPPLY...

Page 11: ...2 HEAT RELAY 1 HEAT RELAY 2 COOLING TRANSFORMER Y2 Y1 G RC COOLING CONTACTOR 1 COOLING CONTACTOR 2 FAN RELAY HEAT 1 HIGH LIMIT HIGH LIMIT L1 HOT L2 HEAT AUTO OFF SYSTEM SWITCH AUTO ON FAN SWITCH COOL HEAT 2 2 1 COOL 2 COOL 1 L1 HOT L2 1 2 S1 S2 S3 S1 S2 S3 A A A A A A A 202905 REMOTE SENSOR 5 1 2 3 4 3 SUBBASE LOGIC CONTROL CIRCUIT 5 4 6 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTIO...

Page 12: ...2 HEAT RELAY HEATING DAMPER OR CHANGEOVER RELAY COOLING TRANSFORMER O Y2 Y1 G RC STAGE 1 COOLING RELAY STAGE 2 COOLING RELAY COOLING DAMPER OR CHANGEOVER RELAY FAN RELAY HEAT 2 HEAT 1 HIGH LIMIT HIGH LIMIT L1 HOT L2 HEAT OFF COOL SYSTEM SWITCH COOL 1 COOL 2 AUTO ON FAN SWITCH L1 HOT L2 NON ELECTRIC ELECTRIC FAN OPERATION SWITCH 3 2 4 1 3 1 SUBBASE LOGIC CONTROL CIRCUIT 5 1 2 3 4 5 POWER SUPPLY PRO...

Page 13: ... RATE TO HOT WATER SETTING 3 cph THERMOSTAT DOES NOT PROVIDE MINIMUM OFF TIME IN HEATING 1 S1 S2 S3 S1 S2 S3 AA A A AA AA AA 202905 REMOTE SENSOR 3 OFF COMPRESSOR CONTACTOR HEATING CHANGEOVER H1 H2 C1 C2 1 2 5 SUBBASE LOGIC CONTROL CIRCUIT POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED APPLICABLE ONLY ON T8621 MODEL WITH REMOTE SENSOR RECOMMENDED INTERCONNECT CABLE 18 GA...

Page 14: ...R SETTING 3 cph THERMOSTAT DOES NOT PROVIDE MINIMUM OFF TIME IN HEATING M1548C SYSTEM TRANSFORMER R C W1 W2 Y2 Y1 G RC FAN RELAY HIGH LIMIT HIGH LIMIT L1 HOT L2 HEAT AUTO COOL SYSTEM SWITCH AUTO ON FAN SWITCH 1 S1 S2 S3 S1 S2 S3 A A A A A A 202905 REMOTE SENSOR 3 OFF COMPRESSOR CONTACTOR COOLING CHANGE OVER H1 H2 C1 C2 RELAY K K SUBBASE LOGIC CONTROL CIRCUIT 6 4 5 POWER SUPPLY PROVIDE DISCONNECT M...

Page 15: ...C CONTROL CIRCUIT 4 3 4 POWER SUPPLY THERMOSTAT LOGIC CIRCUIT Refer to Figs 8 14 for typical hookups of subbase and thermostat ADJUSTING CYCLE RATE To customize the thermostat cycling performance to various types of heating equipment cycle rate adjustment screws are provided on the back of the thermostat to provide optimum room temperature control NOTE Most applications will not require a change i...

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Page 17: ...e set at least 3 F 2 C above the heating temperature or display will flash COOLING CAUTION Do not operate cooling if outdoor temperature is below 50 F 10 C Refer to manufacturer s 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 compressor Move the system switch to COOL and the fan swit...

Page 18: ...wing test as a check of all thermostat functions If thermostat does not respond as indicated thermostat must be replaced 1 Press AHEAD and BACK keys at the same time While holding keys down all segments of the display should be on see Fig 18 Fig 18 All segments on display WARMER 2 Set the system switch to OFF Press and release AHEAD and BACK and PRESENT SETTING keys at the same time to enter self ...

Page 19: ...OOL AUTO or OFF 6 C 12 HEAT 7 C 24 HEAT Programming the Thermostat STEP 1 ENTER THE DAY AND TIME This thermostat can be programmed either on wall or in hand See page 8 to find out how to remove the thermostat from the subbase Always press the keys with fingertip or similar blunt tool Sharp instruments like a pen or pencil point can damage the keyboard NOTE Check the glossary page 30 for definition...

Page 20: ... until the display shows the desired heating temperature If the display flashes while holding down TEMPERATURE WARMER or COOLER the setting limit has been reached If thermostat is an auto changeovermodel theheatingtempera ture must be at least 3 degrees below the air conditioning temperature For ex ample if the cooling setting is 75 F the maximum heating setting is 72 F To set a higher heating tem...

Page 21: ...e display shows the desired heating temperature Press and release The display shows COOL the preprogrammed cooling temperature and the programmed start time for NIGHT Press and hold until the display shows the desired cooling temperature for NIGHT If the display blinks while holding down TEMPERATURE WARMER or COOLER the setting limit has been reached If thermostat can switch auto matically between...

Page 22: ...s in the display Press and release The day to be copied will show and the next day will flash in the display Pressandreleasetocopytheprograminto thedaythatisflashinginthedisplay Note that the next day now starts to flash Press and release if it is not desired to copy into the day that is flashing Note that the next day now starts to flash SET PT MON TUE WED THU FRI COOL DAYTIME AM MIDDAY SET PT MO...

Page 23: ...hows on the display If COOL shows on the display press and release to switch to HEAT Use the AHEAD BACK keys to set the timeandtheWARMER COOLERkeys to set the heating temperature Press and release the PERIOD key to step through the remaining time peri ods Use the AHEAD BACK keys to set the time and the WARMER COOLER keys to set the heating tem perature for each time period Press and release so COO...

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Page 25: ...skipped period During the skipped period the display will flash temporary to show that the programmed temperature for this period is not being used Pressandrelease Thedisplaywillshow the name of the previous period and flash temporary until the next regu larly scheduled period starts Press and hold until the desired tem perature is reached The display will flash temporary until the next pro gramme...

Page 26: ...ase to return to normal operation Copy the new program into other days if desired When copying a program all the times and temperatures for that day are copied HOLDING A TEMPERATURE FOR EXTENDED ABSENCE This feature is particularly useful when going on vacation or other extended absence It does not cancel the program CANCELING PROGRAM SETTINGS The thermostat requires time and tem peraturesettingsi...

Page 27: ...e next day time and temperature for that period Press and release to return to normal operation Pressandrelease Thedisplaywillshow the current temperature setting for sev eral seconds then revert to the room temperature During recovery from energy savings the setting displayed will not match the programmed setting This is because the thermostat gradually changes the temperature setting during reco...

Page 28: ... During severe weather the T8621 actually controls closer to the setpoint than a conventional thermostat This is because the heat anticipator is replaced by two elec tronic control strategies cycling by heat anticipation and proportional plus integral control Electronic cycling by heat anticipation acts like a tradi tional heat anticipator except that it never needs adjusting for various control c...

Page 29: ...EM POWER IS ON NO POWER TO THERMOSTAT NO DISPLAY SEE INSTALLATION INSTRUCTIONS FOR CORRECT MOUNTING PRESENT SETTING APPEARS INACCURATE THERMOSTAT IS IN RECOVERY MODE NORMAL OPERATION THERMOSTAT TURNS ON HEATING COOLING EARLY TO MEET TEMPERATURE SETTING AT PROGRAMMED TIMES RECOVERY CAN BE ENDED BY PUSHING WARMER COOLER KEYS ROOM TEMPERATURE DISPLAY APPEARS INACCURATE THERMOSTAT TEMPERATURE NEEDS TO...

Page 30: ...ture is the energy savings temperature Setup Raising the temperature in the building for a set period in cooling for energy savings The higher temperature is the energy savings temperature Setpoint The thermostat temperature setting the owner selects The thermostat turns the heating or cooling equipment on and off to maintain this temperature at the thermostat location until another temperature se...

Page 31: ...mperatures for One Day 20 Copy the Program to the Desired Days 22 Set the Schedules and Temperatures For the Remaining Days 23 Set the System and Fan Switches on the Subbase 24 Operating the Thermostat 25 Temporarily Changing the Program 25 Reprogramming the Thermostat 25 Holding a Temperature for Extended Absence 26 Canceling Program Settings 26 Checking the Program Times and Temperatures 27 Chec...

Page 32: ... and Building Control Home and Building Control Honeywell Inc Honeywell Limited Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley MN 55422 Scarborough Ontario M1P 2V9 Printed in U S A ...

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