Honeywell DMULTISTAGE T8524C User's Manual
Contents
1. System On indicator is lit but no heat is being delivered Outdoor temperature not displayed Outdoor temperature display is incorrect No power to the thermostat 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 lf 24 Vac is present proceed with troubleshooting Thermostat minimum off time is Wait up to five minutes for the system to respond activated System selection is not set to Set system selection to Heat Heat Heating setpoint is below room Check heating setpoint Set heating setpoint to desired temperature temperature No power to the thermostat Thermostat minimum off time is activated 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 HVAC2. The Installer Setup is used to customize the thermostat to specific systems Installer Setup Numbers are listed in Table 2 The table includes all the configuration options available 69 1055 1 To advance to the next Installer Setup number press the Information i key To change a setting use the increase A or de crease W key To exit the Installer Setup press and hold the Information i key until the display returns to normal approximately three seconds The display scrolls the numbers backwards to get to the normal display The Installer Setup is automatically exited if no key presses are made for five minutes IMPORTANT Only configurable numbers are shown on the device Example If the thermostat does not have a system key Installer Setup Number 12 will not be displayed Review Table 2 factory settings and mark any desired changes in the Actual Setting column When Installer Setup in com plete review the settings to confirm that they match the system Em Ht CI Setting Remote Aux Ht O Room TO dA Humid Di 9 O I x Z i me eR ance Rep O wait kw Heat Cool A KM y Em HeatOffCool Auto Only 11 OnAuto M4844 Fig 9 Display of all the segments of the LCD MODE NUMBER DISPLAY COLUMN 2 OF TABLE 2 FACTORY SETTING OR OTHER CHOICE DISPLAY COLUMN 3 OR 5 OF TABLE 2 M10105 Fig 10 Display of Installer Setup mode and setting A CAUTION Electric heat s
3. system operation settings See Figs 7 and 8 e set the fan operation See Fig 6 for key information 3 69 1055 1 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS HEAT OFF COOL e e e A combination of key presses are required to use the Installer Setup feature To enter the Installer Setup mode press and hold the Information i key with the increase A and decrease W keys until the first number is displayed All display segments appear for approximately three seconds before the number is displayed See Fig 9 and 10 ON AUTO M10146 Fig 7 T8524C system and fan switches location A CHECK LIGHT ON SELECT MODELS M10147 Fig 8 T8524D svstem and fan kevs location NOTE Always press the system and fan 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 A or decrease W key to change the present setting To change between heat and cool press the Information li key until the setting to be changed appears INSTALLER SETUP NOTE For most applications the thermostat factory settings do not need to be changed Review the factory settings in Table 2 and if no changes are necessary go to the Installer System Test section
4. 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 Room temperature display has Enter Installer Setup Number 37 and reconfigure the display display is incorrect been reconfigured Thermostat is configured for F Enter Installer Setup Number 14 and reconfigure the display or C display Bad thermostat location Relocate the thermostat Temperature The upper or lower temperature Check the temperature setpoints settings will not limits were reached e Heating limits are 40 to 90 F 7 to 31 C change Example e Cooling limits are 45 to 99 F 9 to 37 C except T8524D Cannot set the cooling limits are 48 to 99 F heating higher Or The setpoint temperature range Check Installer Setup mode numbers 34 and 35 and the cooling lower stops were configured reconfigure the setpoint stops a Available on select models Continued 69 1055 1 8 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS TROUBLESHOOTING GUIDE Continued Symptom Possibiecesse mm Heating will not come on Heating will not come on Cooling will not come on Heating or cooling comes on momentarily and shuts off
5. Honeywell T8524C D Multistage Microelectronic Thermostats TRADELINE INSTALLATION INSTRUCTIONS APPLICATION The T8524C D Multistage Microelectronic Thermostat provides electronic control of 24 Vac two stage heating and two stage cooling systems Refer to Table 1 for a general description of the thermostat All T8524 Thermostats require a common wire to supply power Table 1 Description of T8524 Thermostats System Fan T8524 System Changeover Selection Selection Comments C Heat Cool Manual Heat Off Cool On Auto System and fan selections are done by switches Heat Cool Automatic Heat Off Cool Auto On Auto System and fan selections are done by keyboard RECYCLING NOTICE If this control is replacing a control that contains mercury in a sealed tube do 70 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 INSTALLATION When Installing this Product 1 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 check out the product operation BU S Registered Trademark Copy
6. an be turned on and off 60 69 System key or system switch position test 70 79 Thermostat information including date code and software versions are displayed 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS Table 4 Installer System Test Options a e Press Number Description Heating Equipment System test a i Stage one heat comes on The system fan is also energied CS a 2 Stage two neat comes on Stage one heat and system fan remainon Stage one heat and system fan turn off Enter cooling equipment system test Set system switch to COOL on T8524C Fan Equipment System test T8524D only Change from cooling to fan equipment system test Key or Switch Operation System test IMPORTANT Test Numbers will only be displayed when the system is configured for the selected function EXAMPLE Numbers 60 61 and 62 are the only numbers that will be displayed when a system is configured for heat only SYSTEM KEY OR SWITCH SYSTEM TEST Move switch to see Test Numbers on T8524C Ftc 60 orange tom cooing ortanto tey operatonssemes FAN KEY SYSTEM TEST T8524D only Fan o _ Fanon Test Number dep SOS Fan oo Fan off Test Numboris displayed SSCS a System fan is energized only if set for electric heat Thermostat Information 2 Press the increase A key to display the production 1 Press the Information i key to access the date code The first two large digits
7. are the month th tat inf tion and the third digit is the last digit of the year a Example 026 February 1996 M4864 M4865 7 69 1055 1 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS 3 Press the increase A key again to display the 5 Press the increase A key again to display the software identification code EEPROM identification code Example 02 software ID code 2 Example 222 EEPROM ID 222 M4866 M4867 4 Press the increase A key again to display the 6 Press and hold the increase A and decrease W software revision number keys together until the room temperature is Example 001 revision number 1 displayed to exit the System Test The System Test times out after five minutes without any key presses CHECKOUT Outdoor Temperature Sensor Where Applicable llow 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 M6791 TROUBLESHOOTING GUIDE Sympiom Pessisiecase Rete Display will not Thermostat is not being Check that C terminal is connected to the system come on powered transformer Check for 24 Vac between C and R or RH terminals If missing 24 Vac check if the circuit breaker is
8. band 30 03 Heating and cooling 04 thru Heating and cooling setpoints can be set no setpoints can be set no closer than 3 F 1 5 C closer than the chosen value 04 4 F RES he S Ca Minimum off 33 05 5 minute minimum off 01 Minimum number of minutes time for the time for the compressor 02 03 O thru 5 the compressor will compressor be off between calls for the compressor a Available on select models b Installer Setup Number 02 must be set to 01 to extend fan operation Continued 5 69 1055 1 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS Table 2 Thermostat Installer Setup Options continued Installer Setup Number Press i key to change setpoint range Cooling setpoint can be 45 gt thru Number can be set set no lower than 45 F Temperature display adjustment temperature a Available on select models b T8524D is 48 F 9 C 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 3 for a list of the available system tests To start the system test NOTE The minimum off time for compressors is bypassed during the Installer System Test Press and hold the increase A and decrease W keys at the same time until two zeros appear All segments of the LCD are displayed before the two zeros appear m Ht me
9. e Setting Remote n i O Room K Humid mC Repl TA cme Batt Q Wait2 W Heat Cool A e y Fan Em HeatOffCool Auto Only II OnAuto M4844 E A pa x m Cr 69 1055 1 Factory Setting Heating setpoint can be 40 thru Number can be set set no higher than 90 F No difference in displayed temperature and actual room Other Choices Press A or W key to change Actual anywhere between 40 and 90 in 1 F increments anywhere between 45 and 99 in 1 F increments 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 TEST MODE NUMBER IMPORTANT T8524C models must set the switches to the equipment that is being checked for the equip ment to operate NOTE Press and hold the increase A and decrease W keys for three seconds to exit the System Test The System Test times out after five minutes without any key presses Table 3 Tests Available In The Installer System Test Test Number System Test Description 10 19 Heating equipment can be turned on and off 30 39 Cooling equipment can be turned on and off 40 49 Fan equipment T8524D only c
10. 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 System selection is not set to Set system selection to Cool Cool Cooling setpoint is above room Check cooling setpoint Set cooling setpoint to desired temperature temperature Heat or cool circuit is opening Add resistor in parallel with load or install interface relay up or becoming high impedance Fan operation set for 00 Enter Installer Setup mode number 02 and reconfigure the fan conventional heat when it operation should be set for 01 electric heat Conventional heating Wait a minute after seeing the On indicator and then check the equipment turns on the fan registers when the furnace has warmed up to a setpoint Heating equipment is not Verify operation of heating equipment in system test operating Option not activated Enter Installer Setup mode number 24 and set to 01 Thermostat must have OT terminals and a C7089B1000 installed Outdoor sensor is connected Refer to C7089B1000 installation instructions and check wiring incorrectly between the thermostat and sensor Replace sensor with C7089B1000 sensor a Available on select models 9 69 1055 1 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS 69 1055 1 io 69 1055 1 Hone
11. holes until flush with the wall 69 1055 1 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 Refer to Fig 3 for typical hookups A letter code is located near each terminal for identification N CAUTION Disconnect power before wiring to prevent electrical shock or equipment damage 1 Loosen the terminal screws on the wallplate and connect the system wires See Fig 4 IMPORTANT Use 18 gauge color coded thermostat cable for proper wiring 2 Securely tighten each terminal screw 3 Push excess wire back into the hole 4 Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS THERMOSTAT A ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE COMPRESSOR CONTACTOR 2 A COOLING HEATING TRANSFORMER TRANSFORMER A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A JUMPER RC TERMINAL TO R TERMINAL WHEN INSTALLED ON A ONE TRANSFORMER SYSTEM A CAN BE USED FOR CHANGEOVER VALVE ON HEAT Made PUMP SYSTEMS METDRA Fig 3 Typical hookup of T8524 in a multistage heating and cooling system Fig 5 Mounting thermostat on wallplate NOTE Toremove the thermostat from the wall first pu
12. ll out at the bottom of the thermostat remove top last INCREASE TEMPERATURE SETTING 886 DECREASE TEMPERATURE SETTING I DISPLAY PRESENT KN SETTINGS AND SCROLL N THROUGH INSTALLER 9 SETUP MODES c D INFORMATION KEY DJ M6801 FOR STRAIGHT FOR WRAPAROUND INSERTIONISTRIP Fig 6 Thermostat key locations and descriptions INSERTION STRIP 5 16 IN 8 MM 7 16 IN 11 MM M4826 SETTINGS System and Fan Settings Fig 4 Proper wiring technique Mounting Thermostat System settings control the thermostat operation as 1 Engage tabs at the top of the thermostat and follows wallplate See Fig 5 Heat The thermostat controls the heating Off Both the heating and cooling are off 2 Press lower edge of case to close and latch Cool The thermostat controls the cooling Auto T8524D only The thermostat automatically changes between heating and cooling operation Using Thermostat Keys depending on the indoor temperature The thermostat keys are used to e set temperature Fan settings control the system fan as follows e display present setting On Fan operates continuously e configure Installer Setup Auto Equipment controls fan e check System Test e display outdoor temperature select models The system default setting is Heat and the fan default setting is Auto Use the keyboard or system and fan T8524D has keys to switches depending on model to change to the desired e set the
13. right 1997 Honeywell Inc 2 All Rights Reserved 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 1 Do not install the thermostat where it can be affected by drafts or dead spots behind doors and in corners _hotor 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 on 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 69 1055 1 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS 5 FEET 1 5 METERS M10106 Fig 1 Typical location of thermostat WALL WIRES THROUGH WALL MOUNTING HOLES Y_ MOUNTING SCREWS M6530 Fig 2 Mounting the wallplate 2 Use a pencil to mark the mounting holes See Fig 2 3 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
14. ystems must be configured to 01 in Installer Setup 02 to prevent equipment damage caused by the system running without the fan 78524C D MULTISTAGE MICROELECTRONIC THERMOSTATS Table 2 Thermostat Installer Setup Options Installer Setup Number Other Choices Press i key Factory Setting Press A or W key to change Actual how PL PP mA Fan operation 02 Conventional applica Heat pump and electric heat tions where equipment applications where controls fan operation in thermostat controls fan heat mode operation in heat mode Notused mamo fff Stage two 6 cph used for 01 03 01 1 cph used for radiant heating cycle conventional systems or 09 floor heat gravity systems rate 03 3 cph used for hot water systems or high efficiency furnaces 09 9 cph used for electric heat Changeover 12 Manual ae a UO ee T8524D only Degree 14 I is ii is displayed in temperature displayed in F C display Extended fan 19 No extended fan Fan operation is extended operation in operation after the call 90 seconds after the call for heating b for heat ends heat ends Extended fan No extended fan Fan operation is extended operation in operation after the call 90 seconds after the call for cooling for cool ends cool ends Notused famus __ Outdoor 24 No outdoor temperature 01 Outdoor temperature is temperature is displayed displayed Needs a display C7089B1000 Outdoor Sensor to operate Notuses fsm H ee Ri Dead
15. ywell Home and Building Control Honeywell Inc Honeywell Plaza P O Box 524 Minneapolis MN 55408 0524 69 1055 1 J H Rev 6 97 Home and Building Control Honeywell Limited Honeywell Limit e 155 Gordon Baker Road North York Ontario M2H 3N7 Printed in U S A on recycled paper containing at least 10 post consumer paper fibers www honeywell com yourhome
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