Honeywell T8024D Users Manual 68 0195
T8024D 68-0195
2015-01-23
: Honeywell Honeywell-T8024D-Users-Manual-262448 honeywell-t8024d-users-manual-262448 honeywell pdf
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T8000C, T8001C,T8024D Programmable Thermostats PRODUCT DATA FEATURES APPLICATION The T8000C, T8001C and T8024D Programmable Thermostats provide programmable temperature control for 24 Vac heating-cooling systems with manual changeover from heat to cool. The T8000C and T001C provide singlestage heating and cooling control and the T8024D provides two-stage heating and two-stage cooling contorl. Heating cycle rates are selectable at 1, 3, 4, 5, 6, 9, or 12 cph. Cooling cycle rates are fixed at 3 cph. Temperature indication can be set for °F or °C. The T8000C is powered through the heating/cooling system controls. The T8001C and T8024D are powered directly through the system transformer. • Attractive styling complements any decor to the homeowner s delight. • Preprogrammed for your convenience. • Program up to four time periods and temperature setpoints to complement your lifestyle. • Programs are permanently held in non-volatile memory in the event of a power failure. • Indefinite setpoint temperature hold for added comfort and energy savings. • Ease-of-use means fewer homeowner questions and increased homeowner satisfaction. • Large temperature display for quick easy readability. • Conveniently sized thermostat (5-1/2 x 3-1/2) with optional decorator cover plates (7-3/8 x 5-3/4) make it easy to install in a variety of locations. • Keys are located by the display for easy access. • FAN and SYSTEM switches are located on the lower edge to eliminate accidental setting changes. • Easy installation, setup and self-test saves time and increases installer productivity. • Manual changeover from heat to cool eliminates unexpected system operation. • °F or °C temperature display for added model flexibility. • Selectable heating cycle rate (1, 3, 4, 5, 6, 9 or 12 cph) for a variety of applications which reduces the amount of inventory. • Cooling cycle rate is fixed (3 cph), the standard setting for compressors, for speedy installation. • Setpoints are permanently held in non-volatile memory (no batteries required) and retained during power outages for increased installer and homeowner convenience. • Power stealing and hardwired models available for virtually all equipment and application needs including; gas, oil and electric forced air, condensing gas furnaces, forced air zoning systems, single stage heat pumps, hydronic heat, gravity and radiant floor heat systems. Contents Application .......................................................................... Features .............................................................................. Specifications ...................................................................... Ordering Information ........................................................... Installation ........................................................................... Installer Setup ..................................................................... Operation ............................................................................ Checkout ............................................................................. Troubleshooting .................................................................. ® U.S. Registered Trademark Copyright © 2001 Honeywell • • All Rights Reserved 1 1 2 2 3 6 8 9 12 68-0195-2 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS Cycle Rates (at 50% Load): Heating: Selectable at 1, 3, 6, 9 or 12 cph. See Heating Cycle Rates, Table 1, for cycle rate options and corresponding system equipment. Cooling: Fixed at 3 cph. SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances; therefore, an individual unit might not exactly match the listed specifications. Also, this product is tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed. Finish: T8000C and T8024D TRADELINE¤ MODELS: are available in Premier White¤ and Taupe finish. T8001C MODELS: are available in Premier White¤ color . Accessory: Decorator cover plates; for covering wall marks are available separately. Order Honeywell part no. 209649A for Taupe, or part no. 209649B for White. 7-3/8 in. (188 mm) x 5-3/4 in. (146 mm). The TRADELINE¤ models include a thermostat, wallplate and owner s guide. A 7 3/8 in. x 5 3/4 in. (188 mm x 146 mm) decorator cover plate (for covering wall marks) is available separately. Order Honeywell part no. 209649A (taupe) or part no. 209649B (white). Dimensions: See Fig. 1. Power: 24 Vac nominal, 18 to 30 Vac, 50 or 60 Hz. WALLPLATE 4-3/8 (111) Electrical Ratings: T8000C: Heating: .02-1.2A run; 3.5A inrush. Cooling: .02-1.2A run; 6.0A inrush. T8001C and T8024D: Heating: .02 to 1.5A run; 3.5A inrush. Cooling: .02 to 1.5A run; 7.5A inrush. T8000C, T8001C and T8024D: Fan: .02 to 0.5A run; 2.5A inrush. 3-5/16 (84) 2-3/8 (70) Current Draw: T8000C Power Stealing Thermostat requires only 2.5 mA current draw when the thermostat calls for heat and is compatible with most 24V microprocessor systems. For further detail, see Power Stealing in the OPERATION section. THERMOSTAT AND WALLPLATE 1-3/16 (55) THERMOSTAT 5-1/2 (140) Temperature Adjustment: Setpoint temperature is adjusted by using the ▼ or ▲ keys. One press changes the setpoint one degree; pressing and holding changes the setpoint several degrees. Hold Select PM TUE 3-1/2 (89) Temperature Setting Range: 30 to 99°F (4 to 37°C). Ambient Temperature Range: 30 to 110°F (4 to 43°C). Shipping Temperature Range: -20 to 120°F (-29 to 49°C). FAN Auto On SYSTEM Cool Off Heat M14675 Operating Relative Humidity: 5% to 90% RH, noncondensing. Fig. 1. T8000/T8001 Thermostat dimensions in in. (mm). 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. 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, MN10-1461 Golden Valley, Minnesota 55422-4386 1-800-468-1502 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. 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. 68-0195–2 2 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS INSTALLATION MERCURY NOTICE When Installing this Product… If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Dispose of it properly. 1. Read these instructions carefully. Failure to follow them could 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 installation is complete, check out product operation as provided in these instructions. Contact your local waste management authority for instructions regarding recycling and the proper disposal of a control. If you have questions, call the Honeywell Customer Response Center at 1-800-4681502. Location Install the thermostat about 5 ft (1.5m$I above the floor in an area with good air 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. — hot or cold air from ducts. — radiant heat from the sun or appliances. — concealed pipes and chimneys. — unheated (uncooled) areas such as an outside wall behind the thermostat. CAUTION Damage to Heating/Cooling System Possible. Be careful when handling wires during installation. Disconnect power at furnace or main breaker/fuse box. YES NO NO 5 FEET [1.5 METERS] NO M11338 Fig. 2. Typical location of thermostat. Mounting Wallplate to Wall 1. Place the wallplate at the desired location on the wall. 2. Pull the thermostat wire through the wallplate entrance hole. 3. Fasten the wallplate to the wall using the anchors and screws provided. 4. After wiring the wallplate, plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat; see Wiring section. IMPORTANT Level only for appearance. The thermostat functions normally even when not level. Mount wallplate and the T8000C/T8001C with the screws provided (see Fig. 3) as follows: 3 68-0195–2 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS Refer to Fig. 6 through 10 for typical wiring hookups. WALL WALL ANCHORS (2) TERMINAL SCREW FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM) FOR WRAPAROUND STRIP 7/16 IN. (11 MM) G C W2 R MOUNTING SCREWS (2) Y2 WALLPLATE M12202 W1 B Fig. 3. Mounting wallplate to wall. Y Wiring O IMPORTANT Use an 18-gauge maximum wire for wiring the thermostats. M20212 Fig. 4. Wiring connections. All wiring must comply with local electrical codes and ordinances. Disconnect the power supply to prevent electrical shock or equipment damage. KEEP WIRING IN SHADED AREA G The shape of the terminals permits insertion of straight or wraparound wiring connections; either method is acceptable. A letter code is located near each terminal for identification. See Fig. 4. C W2 NOTE: To ensure proper mounting of thermostat, restrict all wiring to the shaded area in the center of the terminals. See Fig. 5. R The T8000C Thermostats are powered through the heating/ cooling system controls and are adaptable to most 18 to 30 Vac heating-cooling systems. W1 B Y The T8001C and T8024D Thermostats are powered directly from the system transformer. The T8001C Thermostats are adaptable to most 18 to 30 Vac single-stage heating/cooling systems and the T8024D is adaptable to multistage systems. All T8001C and T8024D thermostats require a common wire connected to the system transformer to operate properly. O MOUNTING SCREW HOLE WIRING ENTRANCE HOLE MOUNTING SCREW HOLE Fig. 8. T8000C wiring diagram in heat-cool system with two transformers. M18503 Fig. 5. Restrict wiring to shaded area. 68-0195–2 4 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS T8000C THERMOSTAT T8000C THERMOSTAT G G Rc Rc 3 R 1 R W B W O Y B Y O 2 HEAT RELAY ZONE 1 O1 COOL DAMPER 2 1 FAN RELAY L1 (HOT) COMPRESSOR CONTACTOR T8 G1 HEAT DAMPER T7 B1 T6 E1 L2 TRANSFORMER T5 CHANGEOVER CONTROL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 3 JUMPER R TO Rc. 1 T4 JUMPER R TO RC. M12563 Fig. 8. T8000C heat-cool wiring diagram on a zone 1 MABS II Mastertrol control panel. M12561 Fig. 6. T8000C heat-cool wiring diagram in single transformer system with gas heat/electric cooling. T8001 THERMOSTAT G C G R Rc R W 2 4 2 B Y W O B 2 Y HEAT RELAY O 1 3 FAN RELAY COOL DAMPER COMPRESSOR CONTACTOR 1 L1 (HOT) 2 HEAT DAMPER L2 HEAT DAMPER TRANSFORMER HEAT RELAY 1 L1 (HOT) POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 REMOVE RC TO R JUMPER WHEN INSTALLED ON A TWO TRANSFORMER SYSTEM. 3 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. 4 POWER TO R TERMINAL IS REQUIRED WHEN THE SYSTEM SWITCH IS IN THE OFF POSITION. M12562 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 CAN BE USED FOR CHANGEOVER VALVE ON SINGLE-STAGE HEAT PUMP SYSTEMS. Fig. 9. T8001C heat-cool wiring diagram in single transformer system with gas heat/electric cooling. HEATING TRANSFORMER 1 1 M12566 L2 L2 COOLING TRANSFORMER COMPRESSOR CONTACTOR FAN RELAY L1 (HOT) 3 COOL DAMPER T8001 THERMOSTAT G C R W B Y O ZONE 1 O1 Fig. 7. T8000C wiring diagram in heat/cool system with two transformers. G1 B1 E1 CHANGEOVER CONTROL M12567 T8 T7 T6 T5 T4 M1 Fig. 10. T8001C heat-cool wiring diagram on a zone 1 MABS II Mastertrol control panel. 5 68-0195–2 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS DASHED LINES INDICATE TABS ON BACK OF THERMOSTAT T8024 THERMOSTAT G C W2 R W1 Y2 B Y O STAGEONE HEAT RELAY 1 FAN RELAY L1 (HOT) STAGE ONE COOLING Hold STAGETWO COOLING COOL DAMPER HEAT DAMPER Sele ct STAGETWO HEAT RELAY F AutoAN On Coo SYSTE l Off M Hea L2 TRANSFORMER 1 t A ENGAGE TABS AT TOP OF THERMOSTAT POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M20214 WITH SLOTS ON WALLPLATE. Fig. 11. T8024D multistage heat/cool wiring diagram. Setting Fan Operation (Fuel) Switch The fan operation (fuel) switch is preset at the factory in the F position. See Fig. 11. This is the correct setting for most systems. If this system is an electric heat system, set the switch to the E position. The E setting allows the fan to turn on immediately with the heating or cooling equipment in a system where the G terminal is connected. PM TUE Hold Sele ct F AutoAN On Coo SYSTE l Off M Hea t E F FAN OPERATION (FUEL) SWITCH M12580 B PRESS LOWER EDGE OF Fig. 12. Fan operation (fuel) switch. Fig. 13. Mounting thermostat to wallplate. Mounting Thermostat to Wallplate 1. Slide SYSTEM switch to the Off position. 2. Engage the tabs at the top of the thermostat and wallplate. 3. Swing down the thermostat and press the lower edge of the thermostat onto the wallplate to latch. See Fig. 12. 1. Enter Installer Setup. a. Use ▲ or ▼ keys to set the temper-ature setpoint to 52 °F (11°C). b. INSTALLER SETUP Setting °F/°C Indication and Heat Cycle Rate The following instructions provide the information necessary to change the heating cycle rate to match the heating equipment and to choose either Fahrenheit (°F) or Celsius (°C) display. c. NOTE: All four steps must be completed to save changes to the °F/°C indication and the heat cycle rate. 68-0195–2 M14674 CASE TO LATCH. 6 Press the ▲ and ▼ keys simultaneously for more than two seconds to enter installer setup. When released a software revision code is displayed. SET HT. M12582A M12583A Press the ▲ key. Factory config-uration (FC) is displayed (A typical example is M12584A shown, but information displayed varies by model. This information is for factory use only). T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS 4. Setting 2nd Stage Heat Cycle Rate (see Table 1) for the cycle rate options and equipment). a. Press the ▲ key to display the current heat cycle rate setting M12588A of 1, 3, 6, 9, or 12 cph. Optional System Checkout When in steps 1c and 1d only, pressing the ▼ key can be used to turn heat or cool outputs on and off. Change the SYSTEM switch setting to test heat or cool outputs. No action takes place If the system switch is in the Off position. Examples: System setting at HEAT: If heat is on, pressing the ▼ key turns it off; if heat is off, pressing the ▼ key turns it on. NOTE: If the desired cycle rate is displayed, press the ▲ key to exit the installer setup. b. System setting at COOL: If cool is on, pressing the ▼ key turns it off; if cool is off, pressing the ▼ key turns it on. The five minute minimum off time is bypassed. M12589A NOTE: For T8024D, a second press ▼ turns on the 2nd stage. c. CAUTION Press the ▲ key to display cooling algorithm configuration default. M14691 Allow compressor to remain off for 5 minutes before restarting. Refer to manufacturer recommendations. NOTE: In Installer Setup only, each press of the ▲ key momentarily displays 1. Each press of the ▼ key momentarily displays 2. When the keys are released, these one-digit codes are no longer displayed. 2. Setting °C or °F. a. Press the ▲ key again to display the current setting. b. Press the ▼ key to change the °C or °F indication. To change the second cycle rate, press the ▼ key until your choice of 1, 3, 4, 5, 6, 9, or 12 is displayed. d. Press the ▲ key again to change algorithm to C1 or C3. C1 = Standard algorithm. C3 = Agressive algorithm (can cause overshooting). e. Press the ▲ key again. Current configuration (CC) is displayed. A typical example is shown, but CC varies by model. (This information is for factory use only.) 5. Exit Installer Setup. a. Press the ▲ key to save all changes and return to normal operation. M12587A M12586A 3. Setting number of heat/cool stages (T8024 only). a. Press ▲ to display number of cooling stages. M14692 PM M12590A Table 1. Heating Cycle Rates M20215 System b. Press ▼ to change number of cooling stages. M20216 c. Press ▲ to display number of heat stages. Cycles Per Hour Steam, Gravity 1 Hydronic Heat, Condensing Gas Furnaces a 3 Gas or Oil Forced Air 6 Electric Heat 9 Special Applicationsb 12 a High efficiency furnace (90+). b Refer to the equipment manufacturer s Instructions. M20217 d. Press ▼ to change number of heat stages. M20218 7 68-0195–2 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS OPERATION Setting the Current Time and Day 1. To Set Current Time. a. Press Select twice. b. Press ▲ or ▼ to set current time. While setting the current time, the word SET is displayed. Setting FAN and SYSTEM Switches Fan and system settings are controlled manually by using the switches located at the bottom of the thermostat case. See Fig. 14. SET PM M12591A 2. To Set Day of Week. a. Press Select again. b. Press ▲ or ▼ to set current day. M12593A SLEE P NOTE: To use the preprogrammed time and temperature (see Table 2), press Hold to exit Programming. Hold Sele ct Table 2. Preprogrammed Time and Temperature Settings. Period F AutoAN On T8000 Coo SYSTE l Off M Hea t Time Heat Setpoint Cool Setpoint Wake 6:00 AM 70°F (21°C) 78°F (26°C) Leave 8:00 AM 62°F (17°C) 85°F (29°C) Return 6:00 PM 70°F (21°C) 78°F (26°C) Sleep 10:00PM 62°F (17°C) 82°F (28°C) Setting the Weekday Program M12547 Slide the SYSTEM switch to the position, heating or cooling, you want to program. The flame (heating) or the snowflake (cooling) will appear in the lower right corner of the display. Fig. 14. Digital Display and System Switches. FAN Switch Fan switch settings are: On: The fan runs continuously. Use for improved air circulation and air quality. Auto: Normal setting for most homes. In cooling, the fan starts and stops with the cooling equipment. In heating, the fan is controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on (most systems). When the fan operation (fuel) switch is in the E position, the fan starts and stops with the heating equipment. 3. WAKE a. Press Select. Press ▲ or ▼ to set WAKE time. Press Select. Press ▲ or ▼ to set WAKE temperature. M12624A 4. LEAVE a. Press Select. Press ▲ or ▼ to set LEAVE time. M12625B b. Slide the FAN switch in the lower left corner of the thermostat to select the desired fan setting. SYSTEM Switch System switch settings control thermostat operation as follows: Cool: The thermostat controls the cooling system. Off: Both heating and cooling are off. Heat: The thermostat controls the heating system. b. Slide the SYSTEM switch in the lower right corner of the thermostat to select the desired system setting. 5. RETURN a. Press Select. Press ▲ or ▼ to set RETURN time. PROGRAMMING The thermostat is flexible and can be programmed for different schedules for weekdays and weekends. Four time periods are available during weekdays and weekends W AKE, LEAVE, RETURN, and SLEEP. b. IMPORTANT Always press the keys with your fingertip or similar blunt tool. Sharp instruments like pens and pencil points can damage the keyboard. 68-0195–2 Press Select. Press ▲ or ▼ to set LEAVE temperature. 8 Press Select. Press ▲ or ▼ to set RETURN temperature. M12626A M12627A M12628A M12629A T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS 11. End Programming. Press Select. End is displayed. Programming is complete. The thermostat will revert to displaying the current day, time and temperature in five seconds. 6. SLEEP a. Press Select. Press ▲ or ▼ to set SLEEP time. M12630A b. Press Select. Press ▲ or ▼ to set SLEEP temperature. M12511A NOTE: To reset the thermostat to the preprogrammed time and temperature settings (see Table 1): 1. Press and hold the Hold and Select keys simultaneously. The display will begin counting down from 36 to zero. 2. The thermostat display will go blank, then will display the current time and temperature. 3. Release keys, the program has reverted to the preprogrammed settings. M12631B Setting the Weekend Program 7. WAKE a. Press Select. Press ▲ or ▼ to set WAKE time. Setting Temperature Hold Slide the SYSTEM switch to the heat or cool position. M12632A b. Press Select. Press ▲ or ▼ to set WAKE temperature. Temporary Temperature Hold 1. Press ▲ or ▼ key to set a temporary temperature setting. TEMPORARY PM WED M12633B M12640A 8. LEAVE a. Press Select. Press ▲ or ▼ to set LEAVE time. NOTE: The temporary temperature setting is displayed for approximately 3 seconds. The setting remains in effect until the next program period. To cancel, press Hold twice. M12634A b. Press Select. Press ▲ or ▼ to set LEAVE temperature. Indefinite Temperature Hold The Hold key allows you to indefinitely hold a temperature. When Hold is active, the letters Hld are displayed continuously. Hold can be canceled by pressing the Hold key again. M12635A 1. Press Hold 9. RETRUN a. Press Select. Press ▲ or ▼ to set RETRUN time. 2. Press ▲ or ▼ key to set indefinite temperature setting. M12641A M12636A b. Press Select. Press ▲ or ▼ to set RETRUN temperature. NOTE: Indefinite hold remains in effect until the Hold key is pressed to cancel it. CHECKOUT M12637A 10. SLEEP a. Press Select. Press ▲ or ▼ to set SLEEP time. Heating 1. Slide the SYSTEM switch to Heat and the FAN switch to Auto. 2. Press and hold the ▲ key to raise the temperature setting several degrees above the room temperature; the heating equipment should start. In conventional systems, the system turns on the fan through the use of a time delay relay or through a limit control. When the fan operation (fuel) switch is in the E position, the fan starts immediately. 3. Press the ▼ key to lower the temperature setting below the room temperature. Heating equipment should stop. M12638A b. Press Select. Press ▲ or ▼ to set SLEEP temperature. M12639B 9 68-0195–2 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS thermostat, the fan starts and stops with the heating equipment. In cooling, the fan starts and stops with the cooling equipment. Cooling CAUTION Make certain all equipment responds properly to the thermostat. Damage To Compressor Possible. Operating at too low of an outdoor temperature may cause compressor damage. Do not operate cooling if outdoor temperature is below 50°F (10°C). Power Stealing Unlike hard wired thermostats which are powered directly from the system transformer, the T8000C Thermostat steals power through the heating and cooling system controls and can be used in applications where existing wiring does not permit using hard wired thermostats. See Fig. 15 and 16. Allow compressor to remain off for five minutes before restarting. Refer to manufacturer’s recommendations. 1. Slide the SYSTEM switch to Cool and the FAN switch to Auto. 2. Press the ▼ key to lower the temperature setting several degrees below the room temperature; the cooling equipment should start. The fan starts and stops with the cooling equipment. 3. Press the ▲ key to raise the temperature setting above the room temperature. Cooling system should shut down. Previous Honeywell power stealing thermostats required 80 mA of load current when the heating and cooling was on. The T8000C Thermostat requires only 2.5 mA of load current (1/32 of previous models) when the heating or cooling is on. When the heating or cooling is off, the thermostat operates at 0.1 mA (1/100 of previous models). Other Honeywell power stealing thermostats are available, but they have different powering requirements than the T8000C. This low current draw makes the T8000C applicable to most 24V heating and cooling systems. NOTE: To prevent damage to the compressor the T8000C/ T8001C have a built-in off-timer. See page 11. Fan The thermostats only operate when mounted on the wallplate with 24V applied. Batteries are not required for operation because temperature setpoints and configuration settings are retained permanently in nonvolatile memory. 1. Slide the SYSTEM switch to Off and the FAN switch to On. The fan should run continuously. 2. Slide the FAN switch to Auto. In heating, the fan is controlled directly by the heating equipment and may start a few minutes after the heating equipment turns on (most systems). When using an electric heat The T8000C is packaged with a 7870 ohm resistor to insure compatibility with TACO zone valves. See Fig. 17. THERMOSTAT WALLPLATE SYSTEM COMPONENTS L1 (HOT) R POWER SUPPLY SYSTEM SWITCH 2 LOGIC/ CONTROL CIRCUIT HEAT L2 1 W HEAT RELAY B OFF HEAT CHANGEOVER RELAY COOL STAGE 1 HEAT OR COOL COOL CHANGEOVER RELAY MOSFET O L1 (HOT) RC HEAT 2 COMPRESSOR RELAY MOSFET L2 1 Y FAN SWITCH FUEL E SWITCH FAN RELAY F ON G AUTO 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 FACTORY INSTALLED JUMPER. Fig. 15. T8000C power stealing internal schematic. 68-0195–2 10 M11730 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS THERMOSTAT WALLPLATE SYSTEM COMPONENTS L1 (HOT) R POWER SUPPLY L2 1 SYSTEM SWITCH C LOGIC/ CONTROL CIRCUIT HEAT RELAY W HEAT OFF HEAT CHANGEOVER RELAY COOL STAGE 1 HEAT OR COOL B K1 O COOL CHANGEOVER RELAY COMPRESSOR RELAY Y FAN SWITCH E FAN RELAY ON F G FUEL SWITCH AUTO M11731 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. Fig. 16. T8001C hardwired internal schematic. Sequence of Operations THERMOSTAT R The Fan, Heat and Cool outputs are relay or mosfet controlled. A loss of ac power or a change in the SYSTEM switch setting can cause the outputs to turn off. The truth table shows the sequence of operations for the FAN settings and SYSTEM modes. See Table 3, Sequence of Operations. W TACO ZONE VALVE Minimum Off-Timer 1 RESISTOR L1 (HOT) A minimum off-timer in the T8000C and T8001D assures that the compressor does not come on again for at least five minutes after it turns off. The minimum off-timer is triggered when the compressor turns off and when the SYSTEM switch position is changed. If the compressor turns off when the setpoint is changed, the minimum off-timer is triggered. Power interruption and power restoration also trigger the minimum offtimer. The minimum off-timer operates in cooling on the T8000C and T8001C. A flashing snowflake indicates the minimum off-timing is in effect. 1 L2 2 3 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M11677 Fig. 17. Connect resistor to the TACO zone valve terminal numbers 1 and 2. Table 3. Sequence of Operations. FAN Switch Settings SYSTEM Switch Settings Call for Action Energize Terminals Display Icons Auto Off None None None On Any Any G None Auto Cool Cooling G,Y Auto Heat Heating W,G a a When the Fuel switch is in the E position. 11 68-0195–2 T8000C, T8001C AND T8024D PROGRAMMABLE THERMOSTATS TROUBLESHOOTING T8000/T8001 SYMPTOM HEATING OR COOLING EQUIPMENT WON'T OPERATE. POSSIBLE CAUSE ACTION NO AC POWER TO THERMOSTAT. • CHECK THAT C TERMINAL IS CONNECTED TO THE SYSTEM TRANSFORMER (T8001 ONLY). • CHECK POWER TO HEATING AND COOLING EQUIPMENT – ON/OFF SWITCH – FUSE OR CIRCUIT BREAKER – LOOSE 24V CONNECTION AT THERMOSTAT AT FURNACE/AIR CONDITIONER – INCORRECT WIRING (SEE WIRING DIAGRAM) THERMOSTAT INOPERATIVE. CONDUCT SELF-TEST; SEE CHECKOUT SECTION. PRESENT SETTING TOO LOW/HIGH. ADJUST TEMPERATURE BY PRESSING SYSTEM SWITCH ON THERMOSTAT IN WRONG POSITION. RESET THERMOSTAT SYSTEM SWITCH. MINIMUM/OFF-TIMES IN THERMOSTAT IN OPERATION ON COOLING. WAIT FIVE MINUTES OR FOLLOW STEPS IN CHECKOUT SECTION. INCORRECT WIRING. CHECK WIRING DIAGRAM. HEATING OR COOLING EQUIPMENT INOPERATIVE. CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS. IS FLASHING AND COOLING WILL NOT OPERATE MINIMUM/OFF-TIMES IN THERMOSTAT IN OPERATION ON COOLING. WAIT FIVE MINUTES OR FOLLOW STEPS IN CHECKOUT SECTION. PARTIAL DISPLAY STILL IN INSTALLER SETUP MODE. SEE THE INSTALLER SETUP SECTION FOR INSTRUCTIONS. INOPERATIVE THERMOSTAT. REPLACE THERMOSTAT. NO POWER TO THERMOSTAT. • CHECK THAT C TERMINAL IS CONNECTED TO THE SYSTEM TRANSFORMER (T8001 ONLY). • CHECK POWER TO HEATING AND COOLING EQUIPMENT – ON/OFF SWITCH – FUSE OR CIRCUIT BREAKER – LOOSE 24V CONNECTION AT THERMOSTAT AT FURNACE/AIR CONDITIONER – INCORRECT WIRING (SEE WIRING DIAGRAM) THERMOSTAT MOUNTED INCORRECTLY ON WALLPLATE. SEE INSTALLATION INSTRUCTIONS FOR CORRECT MOUNTING. TEMPERATURE DISPLAY IS INCORRECT. THERMOSTAT IS CONFIGURED FOR °F OR °C DISPLAY. RECONFIGURE THE DISPLAY. SEE INSTALLER SETUP SECTION. TEMPERATURE SETTINGS WILL NOT CHANGE. (EX: CANNOT SET THE HEATING HIGHER OR THE COOLING LOWER). THE UPPER OR LOWER TEMPERATURE LIMITS WERE REACHED. CHECK THE TEMPERATURE SETPOINTS; TEMPERATURE SETTING RANGE IS 40°F (4°C) TO 99°F (37°C). FAN DOES NOT OPERATE PROPERLY IN HEAT OR COOL MODES. INCORRECT WIRING. CHECK WIRING DIAGRAM. HEATING OR COOLING EQUIPMENT INOPERATIVE. CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS. NO DISPLAY OR KEYS. M11733 Home and Building Control Honeywell 1985 Douglas Drive North Golden Valley, MN 55422 68-0195–2 G.H. Rev. 10-01 Home and Building Control Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 Printed in U.S.A. on recycled paper containing at least 10% post-consumer paper fibers. 2 www.honeywell.com/yourhome
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