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Manual Honeywell T8624C

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  • Honeywell T8624C - page 1

    1 68-0134 C.H. • 9-93 • ©Honeywell Inc. 1993 • Form Number 68-0134 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. ■ Different schedules may be selected for we ...

  • Honeywell T8624C - page 2

    2 T8624C,D SPECIFICATIONS • ORDERING INFORMATION 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. 3. System, fan switching desired. 2. Number of heat and cool ...

  • Honeywell T8624C - page 3

    3 68-0134 T8624C,D SPECIFICATIONS Fig. 1—T8624 Subbase mounting dimensions in in. [mm]. 4 [121] 3 4 3 [83] 5 16 7 [179] 1 [46] 13 16 5 [135] 5 16 M5181A 4 3 32 [104] 1 31 32 [50] Fig. 2—Typical thermostat keypad. SYSTEM RUN PROGRAM WAKE TIME TEMPERATURE PRESENT SETTING SKIP NEXT PERIOD CHANGE TO LAST PERIOD SET PRESENT DAY/TIME HOLD TEMP DAY SE ...

  • Honeywell T8624C - page 4

    4 T8624C,D SELECTION/APPLICATION Selection/Application The T8624 Thermostat uses the latest microelec- tronic design and control technology to provide home and 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 a ...

  • Honeywell T8624C - page 5

    5 68-0134 Installation T8624C,D INSTALLATION 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 Hon ...

  • Honeywell T8624C - page 6

    6 T8624C,D INSTALLATION Fig. 4—Mounting subbase on wall. WIRES THROUGH WALL OPENING WALL WALL ANCHORS (2) SUBBASE MOUNTING HOLES MOUNTING SCREWS (2) M846 Fig. 5—Restrict wiring to recessed area surrounding terminals. FOR STRAIGHT INSERTION – STRIP 5/16 in. [8 mm] FOR WRAPAROUND – STRIP 7/16 in. [11 mm] RESTRICT WIRING TO THIS AREA WIRING TO ...

  • Honeywell T8624C - page 7

    7 68-0134 T8624C,D INSTALLATION Fig. 6 — T8624C 2-stage heat/1-stage cool thermostat with HEAT-AUTO-COOL-OFF system and AUTO-ON fan switching. NOMINAL 24 Vac POWER MUST BE PRESENT BETWEEN R AND C FOR THERMOSTAT OPERATION. DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION. M5233 HEATING TRANSFORMER R C W1 W2 HEAT RELAY 1 HEAT RELAY 2 COOLING TRANSFORM ...

  • Honeywell T8624C - page 8

    8 T8624C,D INSTALLATION DENOTES THERMOSTAT TO SUBBASE INTERCONNECTION. M3765 HEATING TRANSFORMER R C W1 W2 HEAT RELAY 1 HEAT RELAY 2 COOLING TRANSFORMER Y2 Y1 G RC COOLING CONTACTOR 1 COOLING CONTACTOR 2 FAN RELAY HIGH LIMIT HIGH LIMIT HEAT AUTO OFF SYSTEM SWITCH AUTO ON FAN SWITCH COOL HEAT 2 COOL 2 COOL 1 SUBBASE LOGIC/ CONTROL CIRCUIT POWER SUPP ...

  • Honeywell T8624C - page 9

    9 68-0134 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; convertible to auto fan on cool only. FOR ELECTRIC HEAT APPLICATIONS (AUTO FAN OPERATES WITH W1 AND Y1), USE ONLY ONE TRANSFORMER; JUMPER R AND RC. SET SWITCH TO ELECTRIC POSITION. NO ...

  • Honeywell T8624C - page 10

    10 T8624C,D INSTALLATION Fig. 9 — Cycle rate adjustment. SYSTEM GRAVITY AIR/WATER HOT WATER GAS/OIL WARM AIR ELECTRIC WARM AIR 1A OUT 1/2 TO 1 TURN OUT 1/2 TO 1 TURN OUT 1/2 TO 1 TURN OUT 1/2 TO 1 TURN 1B IN IN (FACTORY SETTING) IN IN TIME/TEMP DISPLAY 2A 2B 24 HR IN 12 HR o o C F OUT 1/2 TO 1 TURN OUT 1/2 TO 1 TURN IN M311A 1 SCREWS 2A, 2B AVAIL ...

  • Honeywell T8624C - page 11

    11 68-0134 T8624C,D INSTALLATION • CHECKOUT Fig. 11 — Mounting thermostat on subbase. M3764 PM RETURN MON HEAT ON SYSTEM A U T O P M R E TU R N M O N H E A T O N SYSTEM R U N P R O G R A M T I M E T E M P E R A T U R E P R E S E N T S E T T IN G S K IP N E X T P E R IO D C H A N G E T O L A S T P E R I O D S E T P R E S E N T D A Y /T IM E H O ...

  • Honeywell T8624C - page 12

    12 System Press Look For This Response Switch Position This Key Key Down Key Released OFF 06 Blank 02 Blank 05 Blank 04 Blank 01 Blank 00 Blank (CHECK EACH P OSI TION ) 12 See note A OFF 08 Blank 13 Microprocessor mask no. and revision no. 09 Blank 14 Blank HEAT or AUTO 14 1st stage heating and SYSTEM LED on. 14 2nd stage heating also on. 14 2nd st ...

  • Honeywell T8624C - page 13

    13 68-0134 T8624C,D CHECKOUT Third Digit Manual or Auto Changeover System Switch Position 0 Manual HEAT or OFF 1 Auto HEAT or OFF 3 Auto AUTO 4 Manual COOL 5 Auto COOL Fourth Digit Degrees Clock (hrs) System Switch Position 0 F 12 COOL, AUTO or OFF 1 F 24 COOL, AUTO or OFF 2 F 12 HEAT 3 F 24 HEAT 4 C 12 COOL, AUTO or OFF 5 C 24 COOL, AUTO or OFF 6 ...

  • Honeywell T8624C - page 14

    14 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. NOTE: Some models will show 32 ° F instead of the current temperature, indicating the thermostat is op- erating on backup batteri ...

  • Honeywell T8624C - page 15

    15 68-0134 temperature disappear from the display. Press and release. The display shows LEAVE, but no time or temperature. Press and hold until the dis- play shows the desired starting time. 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 cance ...

  • Honeywell T8624C - page 16

    16 T8624C,D PROGRAMMING THE THERMOSTAT SLEEP WAKE Press and hold until SUN ap- pears on the display. Press WAKE, LEAVE, RE- TURN or SLEEP to select the time period. Use the AHEAD/BACK keys to set the time and the LEAVE RETURN BACK AHEAD WARMER COOLER WARMER/COOLER keys to set the temperature. This completes setting the program schedule and heat- in ...

  • Honeywell T8624C - page 17

    17 68-0134 T8624C,D PROGRAMMING THE THERMOSTAT Program the RETURN tem- perature, if desired. MON TUE WED THU FRI COOL RETURN PM SET PT M5038 WARMER COOLER Press and release. The display shows RE- TURN, the time programmed for heating, and 78 ° F. Press and hold until the display shows the desired tem- perature. Program the SLEEP tempera- MON TUE W ...

  • Honeywell T8624C - page 18

    18 T8624C,D PROGRAMMING THE THERMOSTAT • OPERATING THE THERMOSTAT ON AUTO ON M3763 AUTO FAN FAN SET THE SYSTEM AND FAN SWITCHES ON THE SUB- BASE. Depending on thermostat model, some of the switch positions shown may not be available on the ther- mostat. Note the positions provided on the subbase, then set the switch(es) as desired. First set the ...

  • Honeywell T8624C - page 19

    19 68-0134 T8624C,D OPERATING THE THERMOSTAT WARMER COOLER To temporarily raise or lower the tempera- ture for the current period only: TEMPORARY M5046 ON HEAT Press and hold until the de- sired temperature is reached. The display will flash TEM- PORARY until the next pro- grammed time period starts. With the system switch at the AUTO position, pre ...

  • Honeywell T8624C - page 20

    20 day and Sunday settings are canceled separately. Press and hold the desired pe- riod key until the time and temperature clear from the display (about three seconds). Press and release to return to T8624C,D OPERATING THE THERMOSTAT SLEEP NOTE: Moving the system switch also can- cels hold. CANCELING THE PROGRAM SETTINGS The thermostat requires tim ...

  • Honeywell T8624C - page 21

    21 68-0134 T8624C,D TROUBLESHOOTING THERMOSTAT MOUNTED INCORRECTLY ON BASE. BATTERIES ARE INCORRECTLY INSTALLED. SYMPTOM POSSIBLE CAUSE ACTION NO ac POWER TO THERMOSTAT CHECK POWER TO FURNACE OR AIR CONDITIONER. – ON-OFF SWITCH – FUSE OR CIRCUIT BREAKER – LOOSE 24V CONNECTION – AT THERMOSTAT – AT FURNACE /AIR CONDITIONER – INCORRECT WIR ...

  • Honeywell T8624C - page 22

    22 T8624C,D GLOSSARY T r oubleshooting 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 asleep or away. Also called the setback (heating) or setup (cooling) temperature. Period k ...

  • Honeywell T8624C - page 23

    23 68-0134 ...

  • Honeywell T8624C - page 24

    Home and Building Control Home and Building Control Honeywell Inc. Honeywell Limited — Honeywell Limit é e 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, Ontario M1P 2V9 Printed in U.S.A. ...

Manufacturer Honeywell Category Thermostat

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