Honeywell Chronotherm 4 Manual
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T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 11 Table 8. Installer System Test Options. NOTE: Press any key and the numbers will change on the display. Press Time ▼ ▼ to go to the previous test and Time ▲ ▲ to go to the next test. The Run Program Key will not exit from this test. To exit, go to a different test and press Run Program. THERMOSTAT INFORMATION 1.Press the Time ▲ ▲ Key to access the thermostat information.2.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: 027= February 1997). M4934M10351 3.Press the increase ▲ key again to display the software identification code. (Example: 02 = software ID code 2) M4932A Key to PressTest Number Description Heating Equipment System Test Time ▲10 Enter heating equipment System Test. ▲11 Stage-one heat comes on. 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. Emergency Heating Equipment System Test Time ▲20 Change from heating to emergency heating equipment System Test. ▲21 Emergency heat comes on. ▼20 Emergency heat turns off. Cooling Equipment System Test Time ▲30 Change from heating or emergency heating to cooling equipment System Test. ▲31 Cool and system fan come on. ▼30 Cool and system fan turn off. Fan Equipment System Test Time ▲40 Change from cooling to fan equipment System Test. ▲41 Fan comes on. ▼40 Fan turns off. Key Operation System Test Time ▲60 2 Change from fan to key operation System Test.
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 12 4.Press the increase ▲ key again to display the software revision number (Example: 001=Revision number 1).PROGRAMMING The keyboard is located behind the thermostat cover with three frequently used keys by the display. The thermostat display shows day, time, program period, temperature, system and fan operation selection. The thermostat can be set for four times and up to eight temperatures for each day of the week (28 independent time and 56 temperature settings). The ▲ ▲ and ▼ ▼ keys provide quick temporary temperature changes to increase comfort. The Hold Temp key provides energy efficient operation for extended periods of time. Before starting the programming procedure, use Table 9 to organize the program schedule. The factory preprogrammed time, temperature and fan settings are shown in brackets. If a daytime energy savings period is not used, press the period key (Leave or Return) until the time is blank. The fan setting feature is available on select thermostat models. M10229 5.Press the increase ▲ key again to display the EEPROM identification code. (Example: 314 = EEPROM ID 314) M4933A 6.Press the Run Program key to exit the system test. The system test times out after four minutes without any key presses. Table 9. Default Time, Setpoints and Fan Settings. Period Start Time Heat Setpoint Cool Setpoint Fan Setting Monday Wake [6:00 AM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Leave [8:00 AM] [62°F (16.5°C)] [85°F (29.5°C)] [Auto] Return [6:00 PM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Sleep [10:00 PM] [62°F (16.5°C)] [82°F (28°C)] [Auto] Tuesday Wake [6:00 AM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Leave [8:00 AM] [62°F (16.5°C)] [85°F (29.5°C)] [Auto] Return [6:00 PM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Sleep [10:00 PM] [62°F (16.5°C)] [82°F (28°C)] [Auto] Wednesday Wake [6:00 AM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Leave [8:00 AM] [62°F (16.5°C)] [85°F (29.5°C)] [Auto] Return [6:00 PM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Sleep [10:00 PM] [62°F (16.5°C)] [82°F (28°C)] [Auto] Thursday Wake [6:00 AM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Leave [8:00 AM] [62°F (16.5°C)] [85°F (29.5°C)] [Auto] Return [6:00 PM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Sleep [10:00 PM] [62°F (16.5°C)] [82°F (28°C)] [Auto] (continued)
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 13 Table 9. Default Time, Setpoints and Fan Settings (continued). Setting the Current Day and Time IMPORTANT Always press the keys with your fingertip or similar blunt tool. Sharp instruments like pens and pencil points can damage the keyboard. 1.Press Set Current Day/Time. NOTE: On initial power up or after an extended power loss, 1:00 pm flashes on the display until a key is pressed.3.Press Time ▲ ▲ or Time ▼ ▼ until the current time is displayed. NOTE: Tapping the Set Current Day/Time will change the time in one hour increments. M10312 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyMonPM Set Day/Time 2.Press Day until the current day is displayed. NOTE: Sun=Sunday, Mon=Monday, Tue=Tuesday, Wed=Wednesday, Thu=Thursday, Fri=Friday, Sat=Saturday. M10313 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayDayHeat/Cool Settings Daylight TimeCopy PM Tue Set Day/Time M10314 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep Day Time Heat/Cool Settings Daylight TimeCopy AM TueSet Day/Time NOTE: If the current time is Daylight Savings Time, press Daylight Time until DST is displayed. M10315 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeDaylight Time Copy AM DST TueSet Day/Time 4.Press Run Program. M10316 Time Set ProgramSystem Fan Run ProgramRun ProgramHold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyAuto System Fan WakeRoom AM DST Tue Heat Period Start Time Heat Setpoint Cool Setpoint Fan Setting Friday Wake [6:00 AM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Leave [8:00 AM] [62°F (16.5°C)] [85°F (29.5°C)] [Auto] Return [6:00 PM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Sleep [10:00 PM] [62°F (16.5°C)] [82°F (28°C)] [Auto] Saturday Wake [6:00 AM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Leave [8:00 AM] [62°F (16.5°C)] [85°F (29.5°C)] [Auto] Return [6:00 PM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Sleep [10:00 PM] [62°F (16.5°C)] [82°F (28°C)] [Auto] Sunday Wake [6:00 AM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Leave [8:00 AM] [62°F (16.5°C)] [85°F (29.5°C)] [Auto] Return [6:00 PM] [70°F (21°C)] [78°F (25.5°C)] [Auto] Sleep [10:00 PM] [62°F (16.5°C)] [82°F (28°C)] [Auto]
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 14 Programming the First Day Start by programming the Wake time and temperature (and fan operation on select models) for any one day: 1.Press Wake.6.Press increase ▲ or decrease ▼ key until the desired temperature setpoint is displayed. M10317 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Auto System Fan WakeAM TueSet ProgramStart TimeSetting Heat 2.Press Day until the desired day is displayed. M10318 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayDayHeat/Cool Settings Daylight TimeCopyHeat Auto System Fan Wake MonAMSet ProgramStart TimeSetting Heat 3.Press Time ▲ ▲ or Time ▼ ▼ until the desired Wake time is displayed. NOTE: The program times are in fifteen minute intervals. (Example: 8:00, 8:15, 8:30). M10319 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Auto System Fan Wake MonAMSet ProgramStart TimeSetting Heat Time 4.Press increase ▲ or decrease ▼ key until the desired Wake temperature is displayed. NOTE: The setpoint temperature range is 40 to 90°F (7 to 31°C) for heating and 45 to 99°F (9 to 37°C) for cooling. M10320 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Auto System Fan Wake MonAMSet ProgramStart TimeSetting Heat NOTE: Press Fan to modify fan operation. Auto means the fan will run only when the heating or cooling equipment is operating. On means the fan will run continuously for the entire period. 5.Press Heat/Cool Settings to switch to other system temperature setpoint. NOTE: The program times are the same for both heating and cooling. M10321 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool SettingsHeat/Cool Settings Daylight TimeCopyAuto System Fan Wake Mon AM CoolSet ProgramStart TimeSetting Heat Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyAuto System Fan Wake Mon AM CoolSet ProgramStart TimeSetting HeatM10322 7.Press Leave, Return or Sleep and repeat steps 3, 4, 5 and 6 for programming the rest of the day. The first day is now programmed. IMPORTANT Repeat steps 1 through 7 for each day of the week that has a different program than the first day. Refer to Copying a Day section to copy any program day to another. 8.Press Run Program when all days are programmed. M10323 Time Set ProgramSystem Fan Run ProgramRun ProgramHold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyAuto System Fan WakeRoom AM DST Tue Heat Copying a Day NOTE: The thermostat must be in the program mode to use the copy feature. Go to step 2. if the thermostat is already in the program mode. 1.Press Wake. M10324 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Auto System Fan WakeAM TueSet ProgramStart TimeSetting Heat 2.Press Day to select the day to be copied if different from the day displayed. M10325 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayDayHeat/Cool Settings Daylight TimeCopyHeat Auto System Fan Wake MonAMSet ProgramStart TimeSetting Heat 3.Press Copy. M10326 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyCopyMon 4.Press Day until the day to be copied to is displayed. M10327 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayDayHeat/Cool Settings Daylight TimeCopyMonWed
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 15 5.Press Copy. NOTE: donE will be displayed for two seconds and then the normal program display will be shown.Setting Temporary Temperatures Changing Temperature Setting Until the Next Program Period Press increase ▲ or decrease ▼ key until the desired temperature setpoint is displayed. NOTE: If ▼ or ▲ appear under the temperature display, it means that both the heating and cooling setpoints are being adjusted. Tapping the key will change both the heat and cool setpoints by one degree. Press i after the desired setpoint is reached to check the setpoints. M10328 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyCopy 6.Repeat steps 2 through 5 for all the days desired. 7.Press Run Program. Clearing Program Period NOTE: The thermostat must be in the program mode to use the clear feature. Go to step 2 if the thermostat is already in the program mode. 1.Press Wake, Leave, Return or Sleep. M10329 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeaveLeaveReturn Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Auto System Fan MonAM LeaveSet ProgramStart TimeSetting Heat 2.Press Day until the desired day is displayed. M10330 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayDayHeat/Cool Settings Daylight TimeCopyHeat Auto System FanAM Sat LeaveSet ProgramStart TimeSetting Heat 3.Press Leave, Return or Sleep until the start time and temperature setting are cleared (approximately 3 seconds). NOTE: Wake cannot be cleared. M10331 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeatSat Leave Set ProgramStart TimeSetting Leave 4.Repeat steps 2 and 3 for all the periods to be cleared. 5.Press Run Program. M10332 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Wake Temporary Setting NOTE: The temporary temperature setting is displayed for approximately 3 seconds. The setting is canceled when the next period starts or when Run Program is pressed. Changing Temperature Setting Indefinitely 1.Press Hold Temp. M10333 Time Set ProgramSystem Fan Run Program Hold TempHold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Setting 2.Press increase ▲ or decrease ▼ key to change the setting, if desired. M10334 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Setting M10335 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool SettingsHeat/Cool Settings Daylight TimeCopy Cool Setting 3.Press Heat/Cool Settings to change between heat and cool settings. 4.Press increase ▲ or decrease ▼ key to adjust temperature settings. M10336 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyCool Setting NOTE: The display changes from the setpoint to the room temperature after approximately 3 seconds. 5.Press Run Program to cancel the Hold and to return to the program.
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 16 Changing Temperature Setting Until a Designated Day and Period 1.Press Hold Temp twice.NOTE: In this example, the thermostat uses the Hold setting for eighteen days and returns to the daily programs at the Return period start time. The temperature settings are heating 54°F and cooling 84°F. Only the heating temperature is used because the System is set for Heat. The thermostat will use both the heating and cooling temperature settings when the System is set to Auto. IMPORTANT If the Hold needs to be canceled before the designated time, press Run Program to return to the program. Setting Temporary Fan Operation Press Fan until the desired fan operation is selected. This fan setting will be in effect until the next regularly scheduled period starts. Using Daylight Savings Time Feature This feature allows you to change in and out of Daylight Savings Time with a key press. When Daylight Time is pressed in the fall, the time will go back one hour. In the spring, the time will go ahead one hour and the display will show DST. See Setting the Current Day and Time section for initial setting instructions. NOTE: Pressing Daylight Time more than once within a five minute period will scroll you through various time options (example: one hour earlier or later with or without DST). Pressing Daylight Time six times in a five minute period will return you to your original settings. M10337 Time Set ProgramSystem Fan Run Program Hold TempHold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Wake Hold forSetting 2.Press Time ▲ ▲ or Time ▼ ▼ until the desired number of days is displayed (1 to 256 days). (Example: 18 = Hold will override the daily programs for 18 days) M10338 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Wake Hold forSettingTime 3.Press Wake, Leave, Return or Sleep to select the period the program will start. (Example: Return = thermostat will stop the Hold at the Return period start time) M10339 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave ReturnReturnSleep DayHeat/Cool Settings Daylight TimeCopyHeat Hold for ReturnSetting 4.Press increase ▲ or decrease ▼ key to adjust the temperature setting, if desired. (Example: Heat 54° = heating equipment will operate when the room temperature is below 54°F) M10340 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyHeat Hold for ReturnSetting NOTE: When the System is set for Auto, both heat and cool settings are needed. If the System is set for Heat, only the Heat setpoint is needed or if Cool is selected, only the Cool setpoint is needed. 5.Press Heat/Cool Settings to change between heat and cool settings. 6.Press increase ▲ or decrease ▼ key to adjust the temperature setting, if desired. (Example: Cool 84° = cooling equipment will operate when the room temperature is above 84°F) M10342 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyOutdoor M10341 Time Set ProgramSystem Fan Run Program Hold TempSet Current Day/TimeWakeLeave Return Sleep DayHeat/Cool Settings Daylight TimeCopyDaylight Time Auto System Fan WakeRoom AM Tue Heat Displaying the Outdoor Temperature If your thermostat is equipped with an outdoor sensor, you can check the temperature at the sensor by pressing the i once.
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 17 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 phenomenon that most people in the industry know and accept. Many factors contribute to offset including switch differential, 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 than 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 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 is 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. 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 10 for specific information. NOTE: Not all the thermostat models have all the terminals listed in the Energize column. Table 10. Heat Pump System Sequence of Operation. Fig. 13. Proportional temperature control versus P+I temperature control. HEATING COOLING PERCENT LOAD TEMPERATURE THERMOSTAT HEAT SETPOINTP+I CONTROL POINTPROPORTIONAL COOL CONTROL POINTTHERMOSTAT COOL SETPOINT P+I CONTROL POINT PROPORTIONAL HEAT CONTROL POINT M4414100 50 0 50 100 Equipment Protection As part of the operational sequence, the thermostat microprocessor also incorporates minimum off time for all heating and cooling stages. Using the minimum off time assures that rapid cycling of equipment does not occur, which extends equipment life. Minimum off times are set in the Installer Setup. Selection Fan System Call Energize Display Auto Off None None None On Off None G Auto Cool None O or O/BaNone Auto Cool or AutoStage 1 CoolingO or O/Ba with G and Y1 and Auto Heat None B or O/BaNone Auto Heat or AutoStage 1 heatingB or O/Ba with W1 and G and Auto Heat or AutoStage 2 heatingB or O/Ba with W2, W1 or Y1 and G, , and Aux Ht Auto Em Heat None B or O/Ba with X1Em Ht Auto Em Heat Stage 1 heatingB or O/Ba with X1 and E and G (select models) , and Em Ht Auto Em Heat Stage 2 heatingB or O/Ba with X1, E and W2 and G (select models) , , Em Ht and Aux Ht Auto Auto None O/Ba, O or BbNone aConfigure O/B (select models) in Installer Setup number 29. bBased on last piece of equipment called (cooling = O or heating = B) and Installer Setup selection.
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 18 Thermostat Operation Startup When power to the thermostat is turned on, a startup and initialization program begins. The startup occurs only on initial powerup. After total loss of power for an extended period, the current time and day may need to be set, but the user program is held. See Table 11 for the default values. NOTE: Immediately following initialization, the user can enter new setpoints to be used in place of the default values. Table 11. Default Time, Setpoint and Fan Settings. Adaptive Intelligent Recovery® Feature Adaptive Intelligent Recovery® control assures that the comfort setting is achieved at the programmed time regardless of weather conditions. Conventional recovery, however, starts recovery at the beginning of the programmed time period and used the equipment to achieve the comfort settings as soon as possible. Adaptive Intelligent Recovery® control calculates the recovery ramp based on the number of degrees away from the desired setpoint, previous equipment performance, and weather history to initiate recovery at the optimal time to achieve the comfort setting at the desired time. The Chronotherm® IV uses two recovery ramps, one for the compressor and one for the auxiliary heat. Once the room temperature intersects the compressor ramp, the compressor snaps on until the setpoint is reached. If the temperature does not rise fast enough and intersects the second ramp, the auxiliary heat comes on. If the setpoint is reached too early or too late, the ramp is adjusted for the next day’s recovery. See Fig. 14. Unlike the Chronotherm® III, the Adaptive Intelligent Recovery® can be turned off in the Installer Set-up mode. Honeywell does not recommend this because the auxiliary heat comes on once the program time begins, and runs continuously until the setpoint is reached.Period TimeHeat SetpointCool SetpointFan Setting Wake 6:00 AM 70°F (21°C)78°F (25.5°C)Auto Leave 8:00 AM 62°F (16.5°C)85°F (29.5°C)Auto Return 6:00 PM 70°F (21°C)78°F (25.5°C)Auto Sleep 10:00 PM 62°F (16.5°C)82°F (28°C)Auto Fig. 14. Gradual temperature change in recovery. WAKECOMPRESSOR SETPOINT AUXILIARY HEAT SETPOINT ROOM TEMPERATUREM6406A
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 19 TROUBLESHOOTING GUIDE Refer to Table 12 for troubleshooting information. Table 12. Troubleshooting Information. Symptom Possible Cause Action Display will not come on.Thermostat is not being powered. • Check for 24 Vac between R and C 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.Enter Installer Setup number 37 and reconfigure the display. Thermostat is configured for °F or °C display.Enter Installer Setup number 14 and reconfigure the display. Bad thermostat location. Relocate the thermostat. Temperature settings will not change. (Example: Cannot set The upper or lower temperature limits were reached. Check the temperature setpoints: •Heating limits are 40 to 90°F (7 to 31°C) •Cooling limits are 48 to 99°F (9 to 37°C) the heating higher or the cooling lower.)The setpoint temperature range stops were configured.Check Installer Setup numbers 34 and 35 and reconfigure the setpoint stops. Heating will not come on.No power to the thermostat. • Check for 24 Vac between R and C 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. Heating will not come on.Thermostat minimum off time is activated.Wait up to five minutes for the system to respond. System selection is not set to Heat. Set system selection to Heat. Heating setpoint is below room temperature.Check heating setpoint. Set heating setpoint to desired temperature. Cooling will not come on.No power to the thermostat. • Check for 24 Vac between R and C. —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. (continued)
T8611G CHRONOTHERM® IV DELUXE PROGRAMMABLE HEAT PUMP THERMOSTAT 68-0165—1 20 Table 12. Troubleshooting Information (continued). CROSS REFERENCE All SUPER TRADELINE® Chronotherm® IV thermostats are different from the existing Chronotherm® III devices as summarized in Table 13. Table 13. Difference Between Chronotherm® III Thermostats And Chronotherm® IV Thermostats. Feature/Function Chronotherm® III Family Chronotherm ® IV Family Programming 5-1-1 day programming 7-day programming Changeover Automatic or manual changeover models available Automatic/manual changeover selectable Installer Configuration Field settings made via screws on the back of the thermostatField settings made through the keyboard System switching Mechanical switch Keyboard entry Fan switching Mechanical switch Keyboard entry Device color Beige or Premier White® color Taupe or Premier White® color Symptom Possible Cause Action Cooling will not come on (Continued).Thermostat minimum off time is activated.•Wait up to five minutes for the system to respond. •Enter Installer Setup number 33. Reconfigure minimum off time (if required). System selection is not set to Cool. Set system selection to Cool. Cool setpoint is above room temperature.Check cooling setpoint. Set cooling setpoint to desired temperature. Heating or cooling come on momentarily and shut offHeat or cool circuit is opening up or becoming high impedance.Add resistor in parallel with load or install interface relay. System on indicator (flame=heat, snowflake=cool) is displayed, but no warm or cool air is coming from the registers. Heating or cooling equipment is not operating.Verify operation of heating or cooling equipment in System Test. Outdoor temperature not displayedaOption not activated. Enter Installer Setup number 24 and set to 1. Thermostat must have OT terminals and a C7089B1000 installed. Outdoor temperature display is incorrectaOutdoor sensor is connected incorrectly.Refer to C7089B1000 installation instructions and check wiring between the thermostat and sensor. Wrong sensor. Replace sensor with C7089B1000 sensor. a Available on select models