T8524 Deluxe Electronic Thermostat

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1 T8524 Deluxe Electronic Thermostat PRODUCT DATA T8524 FEATURES AND BENEFITS APPLICATION The T8524 Deluxe Electronic Thermostat provides electronic control of 18 to 30 Vac multistage heating and cooling systems. Attractive styling complements any decor to the homeowner s delight. Ease-of-use means fewer homeowner questions and increased homeowner satisfaction. Back lighting the large display makes the Liquid Crystal Display (LCD) very easy to read. Most frequently used keys are located by the LCD for quick and easy access to information. Models available with outdoor temperature sensor capability for homeowner convenience. The sensor is also more accurate than a thermometer. Configurable features allows one model to be used to replace many different models (less inventory, no need to carry separate models to get these features). F or C temperature display; automatic or manual changeover; electric or conventional heat fan operation; adjustable heating cycle rate. Minimum off time for cooling compressors and heat pumps protects and extends the life of the equipment. Easy installation, setup and system test saves installer time and increases productivity. System test simplifies troubleshooting and saves time by overriding the time delays. Setpoints are permanently held in memory (no batteries used) and retained during power outages for increased installer and homeowner convenience. Contents Application... 1 T8524 Features and Benefits... 1 Specifications... 2 Ordering Information... 2 Installation... 3 Wiring... 4 Settings... 6 Installer Setup... 6 Installer System Test... 8 Checkout Operation Wiring Diagram (Fig. 14) Troubleshooting Guide U.S. Registered Trademark Copyright 1997 Honeywell Inc. All Rights Reserved

2 SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances; therefore, an individual unit may 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. Models: See Table 1. Electrical Rating: Input Power: 18 to 30 Vac, 50/60 Hz. Load Rating: See Table 2. Temperature: Setpoint Range: 40 F to 99 F (4 C to 37 C) depending on model and if in heating or cooling. Display Range: Controlled: 30 F to 110 F (1 C to 43 C). Outdoor: -30 F to 120 F (-34 C to 49 C). Display Updates: Controlled: updated every minute. Outdoor: displayed on demand and updated every 10 minutes. Differential (auto changeover models): 3 F (1.5 C) minimum. Interstage Differential: 3 F to 12 F (1.5 C to 6 C) factory option. Minimum Off Time (Cooling and Heat Pumps): 5 minutes ± 0.5. Table 1. T8501 and T8511 Models. Model System Changeover System Selection T8524D Heat-Cool Automatic/ Manual Selectable Fan Selection Comments Heat-Off-Cool-Auto On-Auto System and fan selections are done by keyboard. Table 2. Maximum Amps at 18 to 30 Vac. Relay Running (A) Inrush (A) Heat (all stages).02 to at 200,000 cycles Cool (all stages).02 to at 100,000 cycles Fan.02 to at 200,000 cycles 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 Logistics Honeywell, 1885 Douglas Drive North Minneapolis, Minnesota 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

3 Operating Ambient Temperature: 40 F to 110*F (4 C to 43 C). Shipping Temperature Range: Minus 20 F or 130 F (-29 C to 54 C). Operating Relative Humidity Range: 5% RH to 90% RH; noncondensing. Mounting: The thermostat mounts on a wallplate. The wallplate mounts horizontally on a wall or 2 in. x 4 in. outlet box with the screws provided. Leveling is not required. Dimensions: See Fig /8 (92) 2-3/4 (70) 3/8 (10) 1-13/16 (46) 3-13/16 (97) 1-9/16 (40) 5-1/4 (133) 1/2 (13) 4-1/8 (105) INSTALLATION When Installing this Product 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 checkout the product operation. CAUTION Disconnect power supply to prevent electrical shock or equipment damage. Location Install the thermostat about 5 ft. (1.5m) 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 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 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. Fig. 1. Thermostat dimensions in in. (mm). M11306 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

4 YES NO NO 5 FEET [1.5 METERS] NO Fig. 2. Typical location of thermostat. M Use a pencil to mark the mounting holes. See Fig 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 or wood, 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. WIRING All wiring must comply with local electrical codes and ordinances. Follow equipment manufacturer wiring instructions when available. Refer to Fig. 13 through 18 for typical hookups. A letter code is located near each terminal for identification. Refer to Table 3 for terminal designations. Standard Terminal Designations Table 3. Terminal Designations and Descriptions. Alternate Terminal Designations Typical Connection Function Terminal Type B Heating damper or changeover valve Output 24V powered contact C B a, C, X1, X2 Common Input G F Fan relay Output 24V powered contact O R Cool damper or changeover valve Output 24V powered contact OT, OT Outdoor temperature sensor (C7089B) Input R V 24V system or heating transformer Input RC 24V cooling transformer Input W1 H1, R3 Stage 1 heating relay Output 24V powered contact W2 H2, R4, W3, Y Stage 2 heating relay Output 24V powered contact Y1 C1, M, Y Stage 1 compressor contactor Output 24V powered contact Y2 C2, M, Y Satge 2 compressor contactor Output 24V powered contact a Some OEM models label the terminal for transformer common B

5 CAUTION Disconnect power before wiring to prevent electrical shock or equipment damage. Mounting Thermostat 1. Engage tabs at the top of thermostat and wallplate. Fig Press lower edge of case to latch. 1. Loosen the terminal screws on the back of the thermostat and connect the system wires. See Fig. 4. NOTE: To remove the thermostat from the wall, first pull out at the bottom of the thermostat; remove top last. IMPORTANT Use 18 gauge, color-coded thermostat cable for proper wiring. A. ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE. 2. Securely tighten each terminal screw. 3. Push excess wire back into the hole. WALL WIRES THROUGH WALL B. PRESS LOWER EDGE OF CASE TO LATCH. WALL ANCHORS (2) M6798A Fig. 3. Mounting the wallplate. MOUNTING HOLES MOUNTING SCREWS M Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. Fig. 5. Mounting thermostat on wallplate. Using Thermostat Keys The thermostat keys are used to: set temperature, display present setting, configure Installer Setup, check System Test, display outdoor temperature (select models). Select models have keys to: set the system operation, set the fan operation. See Fig. 6 for the location of the keys. INCREASE TEMPERATURE SETTING i DECREASE TEMPERATURE SETTING DISPLAY PRESENT SETTINGS AND SCROLL THROUGH INSTALLER SETUP (INFORMATION KEY) M6801A FOR WRAPAROUND INSERTION STRIP 7/16 IN. (11 MM). FOR STRAIGHT INSERTION STRIP 5/16 IN. (8 MM). M4826 Fig. 4. Proper wiring technique. Fig. 6. Thermostat key location and description

6 SETTINGS System and Fan Settings System settings control the thermostat operation 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. The system default setting is Heat and the fan default setting is Auto. Use the keyboard to change to the desired settings. See Fig. 7 and 8. System Press to select heating or cooling equipment. Em. Ht.-Emergency heating Heat Heating equipment Off No equipment Cool Cooling equipment Auto Thermostat automatically selects heating and cooling equipment. Fan Press to select heating or cooling equipment. On Fan runs continuously Auto Fan runs when heating or cooling equipment operates System i Fan System Fan 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 and decrease keys until 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 Information i key. To change a setting, use the increase and decrease keys. To exit the Installer Setup, press and hold the Information i key until the display returns to normal (approximately three seconds). The display will scroll the Numbers backwards to get to the normal display. The Installer Setup is automatically exited if no key presses are made for five minutes. Em Ht Temporary Setting Aux Ht Repl Batt Wait Heat Cool System Em HeatOffCool Auto Only Remote Room %Humid Outdoor Fan OnAuto M4844 Fig. 8. All the segments of LCD displayed. INSTALLER SETUP NUMBER DISPLAY (COLUMN 2 OF TABLE 4) M10147A Fig. 7. Thermostat System and fan key location. FACTORY SETTING OR OTHER CHOICE DISPLAY (COLUMN 3 OR 5 OF TABLE 4) NOTE: Always press the keys with your fingertip or similar blunt tool. Sharp instruments like a pen or pencil point can damage the keyboard. Temperature Settings The default setpoint for heat is 70 F (21 C) and for cool is 78 F (25.5 C). Press the increase or decrease key to change the present setting. To change between heat and cool, press the Information i key until the setting to be changed appears. Press the increase or decrease key to adjust the setting. INSTALLER SETUP NOTE: For most applications, the thermostat factory settings will not need to be changed. Review the factory settings in Table 4 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. Installer Setup numbers are listed in Table 4. The table includes all the configuration options available. M10406 Fig. 9. Installer Setup and setting displayed. CAUTION Electric heat systems must be configured to 01 in Installer Setup 02 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 4 factory settings and mark any desired changed in the Actual Setting column. When the Installer Setup is complete, review the settings to confirm that they match the system

7 Table 4. Thermostat Installer Setup Options. Installer Setup Number (Press Time key to Factory-Setting Other Choices (Press or key to change) Actual Select change) Display Description Display Description Setting Not used 1 Fan operation 2 0 Conventional applications where equipment controls fan operation in heat mode 1 Electric heat applications where thermostat controls fan in heat mode Not used 3 Heating cycle rate a 4 6 Stage 1 3 or cph used for steam systems 5 Stage cph factory setting for all stages of system 9 9 cph used for electric heat Not used 6 thru 11 System setting adjustment 12 1 Manual changeover 0 or 2 0 Auto changeover 2 Fixed auto changeover Not used 13 Degree temperature display 14 0 Temperature is displayed in F 1 Temperature is displayed in C Not used 15 thru 18 Extended fan operation in heating Extended fan operation in cooling 19 0 No extended fan operation after the call for heat ends 20 0 No extended fan operation after the call for cool ends 1 Fan operation is extended 90 seconds after the call for heat ends. 1 Fan operation is extended 90 seconds after the call for cool ends. Not used 21 thru 23 Outdoor temperature display (models with OT terminals) 24 0 No outdoor temperature is displayed 1 Outdoor temperature is displayed. Needs a C7089B1000 Outdoor Sensor to operate. Not used 25 thru 29 Deadband 30 3 Heating and cooling setpoints can be set no closer than 3 F (1.5 C) 4 thru 10 Heating and cooling setpoints can be set no closer than the chosen value: 4 4 F (2 C) 5 5 F (2.5 C) 6 6 F (3 C) 7 7 F (3.5 C) 8 8 F (4 C) 9 9 F (4.5 C) F (5 C) Not used 31 and 32 Minimum off time for the compressor Temperature range stops in heating a minute minimum off time for the compressor Highest setpoint heating can be set to The cycle rate for the last stage of heat is adjustable with 6 cph being the factory setting. 0 thru 4 Minimum number of minutes (0 thru 5) the compressor will be off between calls for the compressor 40 to 89 Temperature range (1 F increments) heating setpoint can be set to (continued)

8 Table 4. Thermostat Installer Setup Options (continued). Installer Setup Number (Press Other Choices Time key to Factory-Setting (Press or key to change) Actual Select change) Display Description Display Description Setting Temperature range stops in cooling Lowest setpoint cooling can be set to 46 to 99 Temperature range (1 F increments) cooling setpoint can be set to Not used 36 Temperature display adjustment 37 0 No difference in displayed temperature and actual room temperature +3 thru -3 1 Display adjusts to 1 F higher than actual room 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 Display adjusts to 3 F lower than actual room temperature IMPORTANT Review the settings to confirm that they match the system. INSTALLER SYSTEM TEST Use the Installer System Test to check the thermostat configurations and operation. Refer to Table 5 for a list of the available system tests. To start the system test: TEST NUMBER Fig. 11. Test number displayed. M6792A NOTE: The minimum off time for compressors is bypassed during the Installer System Test. Press and hold the increase and decrease keys at the same time until two zeros appear. All segments of the display will be displayed before the two zeros appear. See Fig. 10 and 11. Em Ht Temporary Setting Aux Ht Repl Batt Wait Heat Cool System Em HeatOffCool Auto Only Remote Room %Humid Outdoor Fan OnAuto Refer to Table 6 for the directions and results of the specific tests. NOTE: Press and hold the increase and decrease keys together for three seconds to exit the system test. The system test will time out after five minutes without any key presses. M4844 Fig. 10. All the segments of the LCD displayed

9 Table 5. Tests Available in the Installer System Test. Test Number System Test Description Heating equipment can be turned on and off Cooling equipment can be turned on and off Fan equipment can be turned on and off System key Thermostat information including date code and software versions are displayed Key to Press Test Number Heating Equipment System Test i 10 Enter heating equipment system test. Description 11 Stage-one heat comes on. When Installer Setup number 02 is 01, the system fan is also energized. 12 Stage-two heat comes on. Stage-one heat and system fan remain on. 11 Stage-two heat turns off. 10 Stage-one heat and system fan turn off. Cooling Equipment System Test i 30 Change from heating to cooling equipment system test. 31 Cooling and system fan come on. 30 Cooling and system fan turn off. Fan Equipment System Test i 40 Change from cooling to fan equipment system test. 41 Fan comes on. 40 Fan turns off. Key or Switch Operation System Test SYSTEM KEY SYSTEM TEST i 60 Change from cooling or fan to key operation system test. System 61 Heat test number is displayed. System 62 Off test number is displayed. System 63 Cool test number is displayed. System 64 Auto test number is displayed. FAN KEY SYSTEM TEST Fan 68 Fan on test number is displayed. Fan 69 Fan off test number is displayed. Table 6. Installer System Test Options

10 Thermostat Information 1. Press the Information i key to access the thermostat information. 5. Press the increase key again to display the EEPROM identification code. (Example: 222 = EEPROM ID 222). M Press the increase key to display the production date code. The first two large digits are the month and the third digit is the last digit of the year (Example: 026=February 1996). M Press the increase key again to display the software identification code. (Example: 02 = software ID code 2). M Press and hold the increase and decrease keys together, until the room temperature is displayed, to exit the system test. The system test times out after five minutes without any key presses. CHECKOUT Outdoor Temperature Sensor (where applicable) Allow the outdoor temperature sensor to soak in the outdoor air for a minimum of five minutes before taking a reading. With an accurate thermometer (±1 F [±0.5 C]), measure the temperature at the sensor location, allowing time for the thermometer to stabilize before reading. Match the thermometer reading to the outdoor temperature display at the thermostat. To verify the resistance of the sensor, remove one wire from one of the OT terminals. Use an ohmmeter to measure the resistance across the sensor. Then verify sensor accuracy with the temperature/resistance curve of Fig M Press the increase key again to display the software revision number (Example: 001=Revision number 1). RESISTANCE (K ohm) M F -40 ( C) (-40) -20 (-29) 0 (-18) 20 (-7) Fig. 12. Sensor resistance vs. temperature performance characteristics. 40 (4) 60 (16) 80 (27) OUTDOOR TEMPERATURE 100 (38) 120 (49) M10172A

11 OPERATION P+I Control The thermostat microprocessor based control requires that the user understands temperature control and thermostat performance. A conventional electromechanical 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 phenonemon that most people in the industry know and accept. Many factors contribute to offset including switch diffewrential, 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 that the conventional electromechanical or electronic thermostats. The temperature control algorithm is called proportional plus integral (P+I) 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 the integral error, which is a deviation based on the length of error time. The sum of the two errors is the (P+I) error. The cycle rate used to reach and maintain the setpoint temperature in 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. 13. THERMOSTAT COOL SETPOINT 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 7 for specific information. Table 7. Multistage System Sequence of Operation. System Fan System Call Energize Display Auto Off None None None On Off None G Auto Cool None O None Auto Cool or Auto Stage 1 Cooling Auto Cool or Auto Stage 2 Cooling O, G, Y1 and O, G, Y1 and Y2 and Auto Heat None B None Auto Heat or Auto Stage 1 Heating Auto Heat or Auto Stage 2 Heating B, G a, and W1 B, G a, W1 and W2 Auto Auto None O or B b None and and a G is energized and fan symbol is displayed on dual fuel b models when set for electric heat. Based on last piece of equipment called (cooling=o or heating=b) and Installed Setup section. TEMPERATURE P+I CONTROL POINT PROPORTIONAL COOL CONTROL POINT PROPORTIONAL HEAT CONTROL POINT P+I CONTROL POINT THERMOSTAT HEAT SETPOINT HEATING COOLING PERCENT LOAD M4414 Fig. 13. Proportional temperature versus P+I temperature control

12 Minimum-Off Timing A minimum-off timer assures that the cooling compressor or heat pump compressor does not come on again for at least five minutes after it turns off. The minimum-off timer is triggered when the compressor goes off and when the system switch is changed. If he compressor turns off when the setpoint is changed, then the minimum-off timer is triggered. The minimum-off timer operates during the first stage of both heating and cooling on the heat pump thermostat models and cooling only on the standard application models. Fan Control The fan will be on when any of these conditions are present (it can take up to 20 seconds for the fan to turn on). Fan On: Fan Auto: This setting means that the fan is energized continuously. The Auto setting means the fan will run only with the heating and cooling system. Select models allow the installer the option of electric or conventional heat fan operation in the installer setup. When set for electric heat systems, the fan comes on at the same time as the heat and is energized by the thermostat. The fan is energized by the plenum switch when set for conventional heating system. Outdoor Temperature Sensor (select models) The outdoor temperature sensor is used to display the outdoor temperature. Pressing the Information i key once will show the outdoor temperature if installer setup number 24 is set to 1. WIRING DIAGRAM (Fig. 14) RC L1 (HOT) L2 1 Y1 G O Y2 C FAN RELAY COMPRESSOR CONTACTOR COOLING TRANSFORMER THERMOSTAT COMPRESSOR CONTACTOR 2 COOL DAMPER 3 B HEAT DAMPER 3 W2 HEAT RELAY 2 W1 HEAT RELAY 1 R OT OT OUTDOOR SENSOR L1 (HOT) L2 HEATING TRANSFORMER 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A ONE TRANSFORMER SYSTEM. CAN BE USED FOR CHANGEOVER VALVE ON HEAT PUMP SYSTEMS. Fig. 14. Typical hookup in multistage heating and cooling application. 1 M11309 TROUBLESHOOTING GUIDE Symptom Possible Cause Action Display will not come on. Thermostat is not being Check that C terminal is connected to the system transformer. powered. Check for 24 Vac between C and R or RH terminals. 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 is incorrect. Room temperature display has been reconfigured. Thermostat is configured for F or C display (select models). Bad thermostat location. Relocate the thermostat. Enter Installer Setup number 37 and reconfigure the display. Enter Installer Setup number 14 and reconfigure the display. (continued)

13 Symptom Possible Cause Action Temperature settings will not change. (Example: Cannot set the heating higher or the cooling lower.) Heating will not come on. Cooling will not come on. System On indicator is lit, but no heat is being delivered. Outdoor temperature not displayed (select models) Outdoor temperature Display is incorrect (select models) The upper or lower temperature limits were reached. The setpoint temperature range stops were configured. No power to the thermostat. System selection is not set to Heat. No power to the thermostat. Thermostat minimum off time is activated. System selection is not set to Cool. Heating equipment is not operating. Option not activated. Outdoor sensor is connected incorrectly. Wrong sensor. Check the temperature setpoints: Heating limits are 45 F to 88 F (7 C to 31 C) Cooling limits are 48 F to 99 F (9 C to 37 C). Check Installer Setup numbers 34 and 35 and reconfigure the setpoint stops. Check that C terminal is connected to the system transformer. Check for 24 Vac between C and R or RH terminals. 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 system switch at the equipment is in the Off position set to 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. Set system selection to Heat. Check that C terminal is connected to the system transformer. Check for 24 Vac between C and R or RC and Y terminals. 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 system switch at the 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. Wait up to five minutes for the system to respond. Enter Installer Setup mode number 33. Reconfigure minimum off time (if required). Set system selection to Cool. Verify operation of heating equipment in system test. Enter Installer Setup number 24 and set to 1. Thermostat must have OT terminals and a C7089B1000 installed. Refer to C7089B1000 installation instructions and check wiring between the thermostat and sensor. Replace sensor with C7089B1000 sensor

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16 Home and Building Control Honeywell Inc. Honeywell Plaza P.O. Box 524 Minneapolis MN Honeywell Latin American Division Miami Lakes Headquarters Commerce Way Suite 500 Miami Lakes FL Home and Building Control Honeywell Limited-Honeywell Limitée 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 Sun Hung Kai Centre No. 30 Harbour Road Wanchai Hong Kong Printed on recycled paper containing at J.H Printed in U.S.A. least 10% post-consumer 16 paper fibers.

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