Honeywell Thermostat T8700C User's Manual
Contents
1. displaying room temperature approximately five seconds simultaneously press and keys and hold for three seconds Release the keys after the display changes Lt WAKE M12519 M12504 Press within five seconds 2 Select Cycles Per Hour The display changes to show current cycle rate setting a Use O or to moe select 1 3 6 or 9 cph Refer to Table 4 Table 4 Heating Cycle Options Program Setting System cph Steam Gravity Hydronic Heat Condensing Gas Furnaces Gas or Oil Forced Air Electric Heat 3 Select Fahrenheit Celsius Temperature a Press to display the current F or C setting Use or to choose between C and F M12521 4 Clock Format a Press once to exit Installer Setup Upon exiting the temperature setting will be at 52 F or 11 C Press Ge six Press to display the current 12 or 24 hour clock setting Use amp or to choose either a 12 or 24 hour clock format M12522 M12511 times to return the thermostat to the normal operating mode with End appearing on the display T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT OPERATION Zero Droop Performance The T8700 Thermostat can control temperature closer to setpoint than electromechanical thermostats This is because proportional plus integral control P I maintains a constant indoor temperature independent of the outdo2. and modernization products from your TRADELINE wholesaler or distributor refer to the TRADELINE Catalog or price sheets for the complete ordering number 1 Order number 2 Accessory if desired 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 Inc 1985 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 429 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 0197 1 T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT INSTALLATION When Installing this Product 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 N CAUTION Damage To Heating Cooling System Possible Be carefu
3. needed and retained during power outages for increased installer and homeowner convenience e Compatible with most equipment and application needs including gas oil and electric forced air condensing gas furnaces hydronic heat and gravity and radiant heat systems e Powerstealing eliminates need to run additional wires Contents AppliCatiOnsecccc cnc ned i Mu ee Nee 1 FOGTUNOS E A 1 Specifications ceeceeeceeeeeeeseeteeeeeeeeeeeeseeeeeesseeeeneeseeeenaees 2 Ordering Information ceeccseseseeeeeeeeeeeeseneesseeeeeeesseeenaees 2 cE e E A 3 Settings and Adjustments 000 0 ceeceeeeeeeeeeeeeseeeeneeeeneetaees 6 Setting the Clock eeceeceeeeeeeeeeeeeeseeeeseeeeaeesneeeeeeeeeeesaees 7 Programming eisini arinenak naenin 7 Operation aean e s ainara Or earr e EA EE AAS Eserin 8 Check ut ecrcnoenerr nran sanaaa Eaa aa En aeS 10 Troubleshooting rrencia E 11 68 0197 1 T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT 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 T8700 TRADELINE models include a thermostat wallplate decorator cover plate and owner s guide The package also includes a
4. press the key to lower the temperature setting several degrees below room temperature 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 Fan T8700B1015 with Fan T8700C A CAUTION 1 y the System switch to OFF and the a switch to Equipment Damage Possible ON The Fan should run continuously Operating at too low of an outdoor temperature 2 Slide the Fan switch to AUTO In heating the fan is can cause compressor damage controlled directly by the heating equipment and starts Do not attempt to operate cooling when outdoor a few minutes after the heating equipment turns on for temperature is below 50 F 10 C Refer to most systems When using the thermostat with the manufacturer recommendations Fuel switch set to the E position for electric heat the fan starts and stops with the heating equipment In cooling the fan starts and stops with the cooling equipment ly 3 Press the key to lower the temperature setting below the room temperature Heating equipment should stop Cooling T8700C Make certain all equipment responds properly to the thermostat 68 0197 1 10 T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT TROUBLESHOOTING Heating cooling No ac power Check power to heating cooling equipment equipment does not On Off switch operate Fuse or circuit breaker Loose 24V connectio
5. resistor for use with Taco zone valves See Fig 11 Power T8700 24 Vac nominal 18 to 30 Vac 60 Hz Electrical Ratings Heating 02 to 1 2A run 3 5A inrush Cooling 02 to 1 2A run 6 0A inrush Fan 02 to 0 5A run 2 5A inrush Current Draw T8700 Power Stealing Thermostat requires only 2 5 mA current draw when the thermostat calls for heat or cool and is compatible with most 24V systems It can be used in most non millivolt applications See Power Stealing in the Operation section 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 Temperature Setting Range 40 F 4 C to 99 F 37 C Operational Ambient Temperature Range 30 F 4 C to 110 F 43 C Shipping Temperature Range 20 F 29 C to 120 F 49 C Operating Relative Humidity 5 to 90 RH noncondensing ORDERING INFORMATION Cycle Rates at 50 Percent Load Heating Selectable at 1 3 6 or 9 cph See Table 2 for heating cycle rates and corresponding system equipment Cooling T8700C Fixed at 3 cph Table 2 Heating Cycle Rates rors System Hour cph Gas orOiFowedAr CS EeorcFumas f o Finish T8700 Premier White color Dimensions See Fig 1 DECORATOR T8700 M12579 COVER PLATE THERMOSTAT Fig 1 T8700 Thermostat dimensions T8700C shown When purchasing replacement
6. Honeywell T8700B C An Electronic Round Programmable Thermostat T8700C APPLICATION The T8700 Electronic Round Programmable Thermostats provide single stage programmable temperature control for 24V heating and or cooling systems See Table 1 for model descriptions Table 1 T8700 Thermostat Description Wiring System Fan Terminals Selection Selection Used T8700B1007 HEAT OFF NONE T8700B1015 HEAT OFF ON AUTO T8700C1005 HEAT OFF ON AUTO R G W Y COOL U S Registered Trademark Copyright 1998 Honeywell Inc e All Rights Reserved PRODUCT DATA FEATURES e Attractive neutral styling complements any decor e Easy to use means fewer homeowner questions and increased homeowner satisfaction e Large easy to read display e Keys located near the display for easy access e Fan and System switches are located on the top of the wallplate to eliminate accidental setting changes e Quick and easy installation Two period programming for added energy savings e Manual changeover from heat to cool eliminates unexpected system operation T8700C F or C temperature display for added model flexibility e Selectable heating cycle rate 1 3 6 or 9 cph allows a variety of applications and reduced inventory e Cooling T8700C cycle rate fixed at 3 cph the standard setting for compressors allows a speedy installation e Programming permanently held in memory no batteries
7. NTER NOTCHS ON THERMOSTAT WALLPLATE B ALIGN PINS ON WALLPLATE WITH CONNECTOR ON THERMOSTAT PRESS FIRMLY TO ATTACH M13208 Fig 13 Mounting thermostat to wallplate NOTE To remove the thermostat from the wallplate grasp the thermostat on both sides and pull the thermostat straight out 68 0197 1 SETTINGS AND ADJUSTMENTS Setting Fan and System Switches Fan and system settings are controlled manually using the switches located at the top of the thermostat wallplate See Fig 14 for switch locations TIME TEMPERATURE FAN SWITCH SOME MODELS A G O DECREASE SETTING INCREASE SETTING M12546A Fig 14 T8700 time temperature display and System Fan switches T8700C shown Fan Switch The Fan switch settings for the T8700B1015 with Fan and T8700C are ON The fan runs continuously Use to improve air circulation AUTO Normal setting for most homes In cooling the fan starts and stops with the cooling equipment In heating the heating system directly controls the fan equipment The fan may start a few minutes after the heating equipment turns on for most systems When the thermostat Fuel switch is set to the E position for electric heat the fan starts and stops with heating equipment Slide the Fan switch on the thermostat to the desired fan setting System Switch The T8700B System switch controls the thermostat as follows HEAT The thermostat controls the heating system OFF Heating i
8. PPLY PROVIDE DISCONNECT MEANS AND PONTRA OVERLOAD PROTECTION AS REQUIRED MOSFET M10360 Fig 15 T8700C power stealing internal schematic 68 0197 1 T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT Table 5 Sequence of Operations Fan Switch Settings System Switch Settings Call for Action Energize Terminals Display Icons a When fuel switch is in the E position T8700B with Fan and T8700C bT8700C only CHECKOUT Heating T8700B C 1 Slide the System switch to HEAT and the Fan switch to AUTO For T8700B1007 Heat Only model a Fan switch is not an option 2 Press and hold the key to raise the temperature setting several degrees above the room temperature IMPORTANT A mimimum off timer for the T8700C assures that the cooling 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 or when the System switch 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 off timer the heating equipment should start In conventional systems the system turns on the fan through a limit control When using the thermostat with the fuel switch set to the E position for electric heat the fan starts immediate Slide the System switch to COOL and the Fan switch to AUTO To start the cooling equipment
9. ent In heating the fan starts a few minutes after the heating equipment turns on With the Fuel switch in the E position for electric heat the fan starts and stops with the heating equipment Heat Mode With the T8700 system switch in the HEAT position the thermostat controls the heating system On a call for heat the W terminal is energized and a flame icon shows on the digital display If the Fuel switch is in the E position both the W and G terminals are energized on a call for heat Cool Mode With the T8700C System switch in the Cool position the thermostat controls the cooling system On a call for cool the G and Y terminals are energized and a snowflake icon gt shows on the digital display A flashing snowflake indicates that the minimum off timer is in effect Minimum Off Timer T8700C A minimum off timer for the T8700C assures that the cooling 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 or when the System switch 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 off timer FAN SWITCH Q FAN RELAY ON _ e G LoN o THERMISTOR THERMOSTAT AUTO SENSOR LOGIC SYSTEM SWITCH HEAT RELAY i O EX Q OFF _ 4_ Q COOL H4 COOL RELAY 5 Oo oN oH A POWER m tocicano d aR Ano POWER SU
10. l when handling wires during installation Disconnect power at furnace or at main breaker fuse box before starting installation RECYCLING NOTICE If this control is replacing a control that contains mercury in a sealed tube do not place your old control in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of an old control containing mercury in a sealed tube 5 FEET 1 5 METERS 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 Hotorcold 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 Mounting Decorator Cover Plate and Wallplate to Wall IMPORTANT Position and level the wallplate for appearance only The thermostat functions properly even when not level Mount decorator cover plate if desired wallplate T8700 and the screws as follows see Fig 3 1 Place the decorator cover plate and the wallplate on the desired wall location 2 Pull the thermostat wire through the entrance hole on the decorator cover plate then through the wallplate entrance hole 3 Plug the wiring hole behind the thermostat to prevent draft
11. n at thermostat at furnace air conditioner Incorrect wiring check appropriate wiring diagram Thermostat inoperative See Checkout section Heating cooling equipment Consult equipment manufacturer instructions inoperative System switch on thermostat in Reset System switch wrong position Flashing Minimum off timer in thermostat Wait five minutes or follow steps in Checkout section Snowflake operating for cooling Partial display Still in installer setup mode See Installer Setup section for instructions on how to exit Damaged thermostat Replace thermostat Displaying only time Power to thermostat is currently Check the power to thermostat and not temperature interrupted Blank display No power to thermostat Check the power to thermostat Thermostat mounted incorrectly on See installation instructions for correct mounting wallplate Temperature display Thermostat is configured Reconfigure display See Installer Set up for instructions to is incorrect incorrectly for F or C change display Cannot change Upper or lower temperature Check temperature setpoints temperature setting range is temperature setting setpoints were reached 40 F 4 C to 99 F 37 C Time loss Power to thermostat was Reset clock See Setting The Clock interrupted longer than 20 minutes 11 68 0197 1 Home and Building Control Honeywell Inc Honeywell Plaza P O Box 524 Minneapolis MN 55408 0524 Honeywell La
12. n of straight or wraparound wiring connections either method is acceptable See Fig 5 FOR WRAPAROUND STRIP 7 16 IN 11 mm FOR STRAIGHT INSERTION STRIP 5 16 IN 8 mm M12537 Fig 5 Wiring connections The T8700 Thermostat steals power through the heating and or cooling system controls and is adaptable to most 24 Vac systems Refer to Fig 6 through 11 for typical wiring hookups HEATING PRIMARY CONTROL A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M16005B Fig 6 T8700B1007 Heat Only wiring diagram T8700B1015 Heat Only with Fan includes dotted line T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT HEATING PRIMARY CONTROL A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M13207 Fig 7 T8700C heat cool wiring diagram in single trans former system with gas or electric heat electric cooling TO BURNER CONTROL CIRCUIT CIRCULATOR POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED OIL PRIMARY A CONNECT V8043E YELLOW LEADWIRE TO THERMOSTAT CONTROL A CONNECT V8043E RED LEADWIRES TO AQUASTAT M12623 A POWER SUPPLY PROVIDE DISCONNECT MEANS AND Fig 10 T8700B1007 Heat Only wiring diagram OVERLOAD PROTECTION AS REQUIRED M12526 for controlling 2 wire hot water zone valves Fig 8 T8700C heat cool wiring diagram in oil heating electric cooling system THERMOSTAT T8700B Oil primary has its
13. or temperature This feature allows the T8700 Thermostat to provide tight temperature control with virtually no noticeable swings in temperature a condition referred to as droop This zero droop performance provides improved comfort and occupants do not need to continually adjust thermostat settings to be comfortable even during extreme weather Power Stealing The T8700 Thermostat steals power through the heating and or cooling system controls therefore it can be used in applications where it is not possible to run additional wires See Fig 15 The T8700 Thermostat requires only 2 5 mA of load current when the heating and or cooling is on When the heating and or cooling is off the thermostat operates at 0 1 mA This low current draw allows the T8700C to be used with most 24V heating and or cooling systems The T8700 Thermostat operates only when mounted on the wallplate with 24V applied Batteries are not required for operation Temperature setpoints programming and configuration settings are retained permanently in memory Sequence of Operations The Heat and Cool outputs are transistor controlled A loss of ac power or a change in the System switch setting can turn off outputs Table 5 shows the Fan and System sequence of operations Fan Control The FAN switch settings for the T8700B1015 with Fan and T8700C are ON and AUTO ON The fan runs continuously AUTO In cooling the fan starts and stops with the cooling equipm
14. own transformer TACO ZONE VALVE BIMETAL SWITCH RESISTANCE SWITCH HEATER HEATER A POWER SUPPLY PROVIDE DISCONNECT MEANS A POWER SUPPLY PROVIDE DISCONNECT MEANS AND AND OVERLOAD PROTECTION AS REQUIRED M12527B OVERLOAD PROTECTION AS REQUIRED connect 7870 OHM RESISTOR TO THE TACO ZONE 1 s x VALVE TERMINALS 1 AND 2 TO ORDER USE PART Fig 9 T8700B1007 Heat Only wiring diagram in NO 4074EYC M13178 electric baseboard or ceiling cable system Fig 11 T8700B1007 Heat Only diagram used with TACO zone valves The 7870 OHM resistor is included 5 68 0197 1 T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT Adjust Fan Operation Switch The thermostat fan operation switch labeled Fuel switch is set at the factory in the F position See Fig 12 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 A T8700C AND T8700B WITH FAN ONLY M12531A Fig 12 Fuel switch rear view of thermostat Mounting Thermostat to Wallplate 1 Align and attach bottom center notch on the thermostat with bottom center tab on wallplate 2 Next align tabs and connector at top of thermostat to the pins on the wallplate Press firmly to attach PINS BOTTOM CENTER NOTCH A ALIGN AND ATTACH BOTTOM CE
15. s from affecting the thermostat 4 Select the two mounting holes that best fit the application 5 Fasten the decorator cover plate and the wallplate to the wall using the provided anchors if necessary and screws M12524 Fig 2 Typical thermostat location 68 0197 1 T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT DECORATOR COVER PLATE Ay PLASTIC SCREW ANCHOR 2 WHEN USING WALL ANCHORS DRILL 3 16 INCH HOLES FOR DRYWALL 7 32 INCH HOLES FOR PLASTER OR WOOD M12532A Fig 3 Mounting decorator cover plate and wallplate on wall T8700C shown Wiring N CAUTION Damage To Heating Cooling System Possible Be careful when handling wires during installation Disconnect power at furnace or at main breaker fuse box IMPORTANT Use an 18 gauge maximum wire for wiring the T8700 Thermostat All wiring must comply with local electrical codes and ordinances A letter is located near each terminal for identification NOTE To ensure proper mounting of thermostat restrict all wiring to the left side of the terminals See Fig 4 68 0197 1 ROUTE WIRING AS SHOWN THROUGH ENTRANCE ALTERNATE MOUNTING SCREW HOLE MOUNTING SCREW HOLE ALTERNATE MOUNTING SCREW HOLE MOUNTING SCREW HOLE WIRING ENTRANCE HOLE M12529 Fig 4 T8700C wallplate wiring connections Refer to Table 1 for T8700B wiring connections The shape of the terminals permits insertio
16. s off The T8700C System switch controls the thermostat as follows COOL The thermostat controls the cooling system OFF Both heating and cooling are off HEAT The thermostat controls the heating system Slide the System switch on the thermostat to the desired system setting T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT SETTING THE CLOCK 2 Set your WAKE time a Press the key 1 To set the current time oly once You will see a air flashing WAKE time a Press the key ILIM M12507 once You will seea lt 7 b Use the Mor keys to set your desired WAKE flashing clock ae time The WAKE time is now set b Use the or keys to set the current time 3 Set your WAKE temperature c Press the Ge key until End is displayed a Press the 6 key once You will see a PROGRAMMING flashing WAKE e temperature The thermostat is preprogrammed for your convenience with b Use the or keys to set your desired WAKE the following time and temperature settings see Table 3 temperature The WAKE temperature is now set Table 3 Preprogrammed Time Temperature Settings 4 Set your SLEEP time Heating Cooling 5 once You willsee a Sees WAKE 6 00 AM 70 F 21 C 78 F 25 5 C flashing SLEEP time LEEP 2 F 16 5 82 F 28 C 2 2 ue b Use the Oor keys to set your desired SLEEP a T8700C only time The SLEEP time is now set WAKE is the time period when yo
17. seconds indica ting the end of programming The thermostat then displays the current time and room temperature M12511 M12542 NOTE To exit the programming mode at any time press the key until End is displayed 68 0197 1 T8700B C AN ELECTRONIC ROUND PROGRAMMABLE THERMOSTAT Operating the Thermostat To Display Temperature Setting Press or once to display present tempera ture setting After approxi mately five seconds the M12512 thermostat displays current time and room temperature To Make a Temporary Temperature Change a Press or until desired temperature is displayed M12513 b TEMPORARY is TEMPORARY wu displayed The TEMPORARY change is in effect until the next program period yO pZ am Z Z or Z L WAKE M12514 NOTE To cancel your TEMPORARY change press until End is displayed To Use Hold Function To hold the thermostat at one temperature indefinitely program both WAKE and SLEEP to the same temperature Installer Setup The following instructions provide the information necessary to change the heating cycle rate select either Fahrenheit F or Celsius C and 12 or 24 hour clock format NOTE To exit at any time press until End is displayed 1 Enter Installer Setup a 68 0197 1 Use amp or keys to set the temperature set point to 52 F 11 C M12518 After the thermostat Oran reverts back to eae Z ilam
18. tin American Region 480 Sawgrass Corporate Parkway Suite 200 Sunrise FL 33325 Home and Building Control Honeywell Limited Honeywell Limit e 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 3213 3225 Sun Hung Kai Centre No 30 Harbour Road Wanchai Hong Kong Honeywell 68 0197 1 D S Rev 7 98 Printed in U S A on recycled amp paper containing at least 10 post consumer paper fibers www honeywell com yourhome
19. u want the house at a 5 Set your SLEEP comfortable temperature during the day temperature SLEEP is the time period you can set for an energy saving temperature while you sleep a Press the key f once You will see a NOTE The heating and cooling program times are the flashing SLEEP M12510 same Changing your cooling WAKE time also temperature changes your heating WAKE time b Use the or keys to set your desired SLEEP The following is a heating program example The System switch is in the HEAT position To change to the cooling program T8700C move the System switch to the COOL 6 position and enter the cooling temperature settings a IMPORTANT When programming the T8700B first move the System switch to the heat position To program your own Time and Temperature settings follow steps 1 through 6 1 Set the current time N 4 7 a Press the 8 key ie once You will see a flashing clock FLILtem x lt M12506 b Use the M or keys to set the current time The clock is now set Preprogrammed Time and Temperature settings After the clock is set you can use the preprogrammed Time and Temperature settings see table 3 press the key until End is displayed The preprogrammed Temperature settings can now be used temperature The SLEEP temperature is now set Run program Press the key once You have completed your program changes End is displayed for five
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