Honeywell Thermostat T8775A User's Manual
Contents
1. NOTE The 5 minute minimum off timer does not apply to heating 1 Slide the system switch to COOL and the fan switch to AUTO 2 Lower the temperature setpoint several degrees below the room temperature 3 A snowflake zh will appear in the display and the cool ing should turn on 4 Raise the temperature setpoint several degrees above the room temperature 5 The snowflake xe will disappear from the display and the cooling should turn off Heating 1 Slide the system switch to HEAT and the fan switch to AUTO T8775C only 2 Raise the temperature setpoint several degrees above the room temperature A flame will appear in the display and the heat should turn on Lower the temperature setpoint below the room temper ature The flame f will disappear from the display and the heat should turn off Fan 1 Slide the system switch to OFF and the fan switch to ON The fan should run continuously 2 Slide the fan switch to AUTO The fan should turn off o gt NOTE Make sure that all equipment responds properly to the thermostat 68 0279 T8775A C THE DIGITAL ROUND NON PROGRAMMABLE THERMOSTATS TROUBLESHOOTING GUIDE SYMPTOM POSSIBLE CAUSE ACTION HEATING OR COOLING EQUIPMENT WILL NOT OPERATE NO AC POWER TO THERMOSTAT ON OFF SWITCH FUSE OR CIRCUIT BREAKER LOOSE 24V CONNECTION AT THERMOSTAT AT FURNACE AIR CONDITIONER INCORRECT WIRING SEE WIRING DIAGRAMS THERMOSTAT INOPERATIVE SEE C2. 60Hz Heating 02 to 1 5 A run 3 5A inrush Cooling 02 to 1 5 A run 6 0 A inrush Fan 02 to 0 5 A run 2 5A inrush Temperature Ratings Setting Range 40 F to 90 F 4 5 C to 32 0 C in heating 45 F to 99 F 7 0 C to 37 0 C in cooling 3 11 Ambient Range 40 F to 110 F 4 4 C to 43 3 C Shipping Temperature Range 20 F to 120 F 28 9 C to 48 9 C Humidity Ratings 5 to 90 RH non condensing Mounting Hardware Sheet metal screws Two 1 in 25 mm 4 24 type AB Drywall anchors Two conical anchors 3 16 in 5 mm diameter by 34 in 19 mm length 4074 FAB Resistor 1 Kohm 3 Watts Installation Instructions packed with resistor Batteries Not required Finish Premier White Accessories 50000066 001 Decorative Cover Plate Used to cover wall marks or to mount T8775 Thermostat to an electrical box 32007680 001 Cover Ring Dimensions See Fig 1 M19676 Fig 1 T8775 Thermostat dimensions in in mm ORDERING INFORMATION When purchasing replacement and modernization products from your TRADELINE wholesaler or distributor refer to the TRADELINE Catalog or price sheets for complete ordering number If you have additional questions need further information or would like to comment on our products or services please write or phone 1 Your local Honeywell Automation and Control Products Sales Office chec
3. 75 Thermostat only operates when mounted on the wallplate with 24 Vac applied Batteries are not required for operation because the temperature setpoint is permanently retained in memory Sequence of Operations See Table 4 for Sequence of Operations Table 4 Sequence of Operations Fan Switch Settings System Switch Settings Call for Action Energize Terminals Display Icons Auto Off None None None Auto Heat Heating wa Flame Auto Cool Cooling Y G Snowflake Off Fan G None On Heat Heating W G Flame On Cool Cooling Y G Snowflake ae f fuel switch is set to E both W and G are energized in a call for heat CHECKOUT Cooling T8775C only N CAUTION Low Temperature Hazard Operating at too low of an outdoor temperature may cause compressor damage Do not operate cooling if outdoor temperature is below 50 F 10 Refer to manufacturer s recommendations Minimum Off Timer The minimum off timer in the T8775C Thermostat assures that the cooling compressor does not turn on for at least five minutes after it turns off The snowflake will flash in the display if there is a call for cooling during the 5 minute off time The following activates the 5 minute minimum off timer Initial startup Power interruption Compressor turns off Setpoint is raised above the room temperature System switch is changed from the cool mode Thermostat ends the call for cooling
4. HECKOUT SECTION PRESENT SETTING TOO LOW HIGH COUNTER CLOCKWISE SYSTEM SWITCH ON THERMOSTAT IN WRONG POSITION RESET THERMOSTAT SYSTEM SWITCH MINIMUM OFF TIME IN COOLING TO TURN ON INCORRECT WIRING CHECK WIRING DIAGRAMS HEATING OR COOLING EQUIPMENT INOPERATIVE PARTIAL DISPLAY INOPERATIVE THERMOSTAT REPLACE THERMOSTAT NO DISPLAY ON OFF SWITCH FUSE OR CIRCUIT BREAKER LOOSE 24V CONNECTION AT THERMOSTAT AT FURNACE AIR CONDITIONER CHECK POWER TO HEATING AND COOLING EQUIPMENT ADJUST TEMPERATURE BY TURNING DIAL CLOCKWISE OR WAIT UP TO FIVE MINUTES FOR THE COOLING EQUIPMENT CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS NO POWER TO THERMOSTAT CHECK POWER TO HEATING AND COOLING EQUIPMENT INCORRECT WIRING SEE WIRING DIAGRAM THERMOSTAT MOUNTED INCORRECTLY ON WALLPLATE SEE MOUNT THERMOSTAT TO WALLPLATE SECTION TEMPERATURE DISPLAY IS THERMOSTAT IS CONFIGURED FOR RECONFIGURE THE DISPLAY SEE CUSTOMIZE INCORRECT F OR C DISPLAY THERMOSTAT SECTION TEMPERATURE SETTINGS WILL NOT THE UPPER OR LOWER CHECK THE TEMPERATURE SETPOINTS TEMPERATURE CHANGE EX CANNOT SET THE TEMPERATURE LIMITS WERE SETTING RANGE IS 40 F TO 90 F 4 5 C TO 32 C IN HEATING HEATING HIGHER OR THE REACHED AND 45 F TO 99 F 7 C TO 37 C IN COOLING COOLING LOWER FAN DOES NOT OPERATE PROPERLY IN HEAT OR COOL MODES CHECK WIRING DIAGRAMS INCORRECT WIRING CHECK FUEL SWITCH POSITIO
5. Honeywell 1T8775A C The Digital Round Non Programmable Thermostats APPLICATION The T8775A and T8775C Thermostats provide single stage non programmable temperature control for 24 Vac systems with manual changeover from heat to cool The T8775A controls 2 wire heating only systems The T8775C controls gas oil or electric heating and cooling systems U S Registered Trademark Patents Pending Copyright O 2004 Honeywell International Inc All Rights Reserved PRODUCT DATA FEATURES Attractive styling complements any decor Simple to use Turn the dial to adjust the setpoint temperature Large easy to read display The temperature reading is easily seen from a distance Backlit display On demand backlighting makes it easy to read the display in a dark room or hallway No batteries required The setpoint temperature is held permanently in memory in the event of a power failure Powered through heating cooling system controls System and Fan switches on the T8775C model Manual changeover from heat to cool on T8775C model Easyinstallation and set up saves time and increases installer productivity Easily configurable by the use of DIP switches Fahrenheit or Celsius temperature display for added flexibility Selectable heating cycle rates 1 3 6 9 for a variety of applications Cooling cycle rate is fixed at 3 CPH This is the standard compressor s
6. N HEATING OR COOLING EQUIPMENT INOPERATIVE SEE CUSTOMIZE THERMOSTAT SECTION CONSULT EQUIPMENT MANUFACTURER INSTRUCTIONS M19684 Honeywell Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario MIV 479 Printed in U S A on recycled 68 0279 J S 4 04 paper containing at least 10 www honeywell com yourhome post consumer paper fibers
7. THERMOSTAT AND WALL PLATE PRESS UPPER EDGE OF CASE TO LATCH M19498 Fig 14 Mount thermostat to wallplate SET SYSTEM AND FAN SWITCHES T8775C ONLY SYSTEM Switch See Fig 15 Heat The thermostat controls the heating system Off Both the heating and cooling systems are off Cool The thermostat controls the cooling system FAN Switch See Fig 15 Auto The fan only runs with the heating and cooling system On The fan runs continuously Use for improved air circulation FEATURES AND OPERATION Features and operation of The Digital Round Thermostat see Fig 15 and 16 Simple to use Turn the dial to adjust the temperature setting Large easy to read display The temperature reading is easily seen from a distance e Backlit display On demand backlighting makes it easy to read the display in a dark room or hallway No batteries required The temperature setting is held permanently in memory in the event of a power failure 68 0279 6 TURN TO SET SYSTEM ene FAN SWITCH SWITCH N T8775C ONLY T8775C ONLY SELECTS SELECTS ON AUTO COOL OFF HEAT ROOM TEMPERATURE INDICATOR SHOWS THAT THE CURRENT ROOM TEMPERATURE IS WALL PLATE LN ff 7 74 gt 168 27 THAT SHOW THERMOSTAT HAS CALLED FOR X Y DISPLAYED HEATING TEMPERATURE OR COOLING sf SS INDICATOR SHOWS THAT THE CURRENT TEMPERATURE DIGITAL DISSE SETPOINT IS DISPLA
8. UPPLIED TO CONNECT W TO Y Fig 13 DIP switch EITHER OR B FOR HEAT PUMP CHANGEOVER m Set Heat Cycle Rate Fig 11 Typical hookup of T8775C in single stage heat Use DIP switches 1 and 2 to set the heat cycle rate See pump system Table 1 Table 1 Heat Cycle Rate CUSTOMIZE THERMOSTAT Cycles DIP DIP Per Switch Switch Heating System Hour 1 2 Setting Fuel Switch T8775C only Steam Gravity o The fuel switch is preset at the factory in the F position See High Efficiency Warm Air 90 3 Off On Fig 12 This is the correct setting for gas or oil systems If the efficiency Hot Water Heat Pump T8775C is being installed on an electric heat system or a heat Gas or Oil Warm Air factory setting 6 Off Off pump set the switch to the E position The E position allows the fan to turn on immediately with the heating equipment in a Electric Warm Air 3 On off system where the G terminal is connected In Floor Radiant Heat Check with manufacturer for recommended cycle rate 5 68 0279 T8775A C THE DIGITAL ROUND NON PROGRAMMABLE THERMOSTATS Fahrenheit Celsius Indication Use DIP switch 3 to set the desired temperature indication See Table 2 Table 2 Temperature Indication Fahrenheit Celsius Display DIP Switch 3 Fahrenheit factory setting Off Celsius On Mount Thermostat to Wallplate see Fig 14 ENGAGE TABS AT BOTTOM OF
9. YED DISPLAYS ROOM DIAL OR SET TEMPERATURE DISPLAYS AND ADJUSTS TEMPERATURE SETPOINT TURNS BACKLIGHT BUTTON BACKLIGHT ON M19681 Fig 15 T8775 Thermostat features and operation oR MaRy M19582 Fig 16 T8775 Thermostat Backlit Display Push the backlight button to turn on the backlight See Fig 15 Display Temperature Setpoint 1 Turn the dial one click to display the temperature set point An gt indicator points to Set when the tempera ture setpoint is displayed see Fig 17 e ROOM gt 0 2107 19489 Fig 17 Temperature setpoint display 2 Ifa change to the temperature setpoint is not made within five seconds the display will switch to the current room temperature An p indicator points to Room when the room temperature is displayed see Fig 18 T8775A C THE DIGITAL ROUND NON PROGRAMMABLE THERMOSTATS nooM M19490 Fig 18 Room temperature display Adjust Temperature Setpoint Turn the dial clockwise to raise the temperature setpoint Turn the dial counterclockwise to lower the temperature setpoint see Fig 16 Power Stealing The T8775 thermostat steals power from R and W or Rc and Y depending on the system switch position See Table 3 Table 3 T8775 Power Stealing Power Stealing Circuit System Switch T8775A T8775C Heat W W Off R and W Cool Rc and Y The T87
10. es in the wall if drywall at the locations you marked For materials such as plaster drill 7 32 in 6 mm holes where marked 3 68 0279 T8775A C THE DIGITAL ROUND NON PROGRAMMABLE THERMOSTATS 4 Tapthe provided wall anchors into the drilled holes until they are flush with the wall 5 Pull the thermostat wires through the wiring hole on the wallplate and reposition the wallplate over the wall anchors 6 Attach the wallplate to the wall with the screws pro vided 7T After wiring the wallplate plug the hole to prevent drafts from affecting the thermostat see Wiring section WIRING IMPORTANT Use 18 gauge wire to wire the T8775A C Thermostats All wiring must comply with local electrical codes and ordinances Disconnect the power supply to prevent electrical shock or equipment damage NOTE To ensure proper mounting of thermostat restrict all wiring to the shaded area See Fig 5 MOUNTING HOLES gt Qv SENS U vo mum A v C WIRING RESTRICT WIRING HOLE TO SHADED AREA M19680 Fig 5 Restrict T8775 wiring to shaded area The shape of the terminals permits insertion of straight or wraparound wiring connections either method is acceptable See Fig 6 FOR STRAIGHT INSERTION STRIP 5 16 IN 8 MM FOR WRAPAROUND INSERTION STRIP 7 16 IN 11 MM M19496 Fig 6 T8775 wiring connections 68 0279 4 Refer to Fig 7 through 11 for t
11. etting Minimum off time for the compressor in the cooling mode Protects and extends the life of the equipment Decorative cover plate is available to cover marks on the wall or to mount the T8775 Thermostat to an electrical box Contents PC 1 Features iiie enne Ae ae 1 Specifications sssssssssssseseeeeeeenenn 2 Ordering Information esssseseeeeeeeeenre 2 2 toti detta re Ree oar RES Rambo cts 3 Inno 4 Customize 5 Set System and Fan Switches 6 Parole ene 7 Troubleshooting Guide 8 68 0279 T8775A C THE DIGITAL ROUND NON PROGRAMMABLE THERMOSTATS 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 cali brated under closely controlled conditions and some minor differences in performance can be expected if those conditions are changed Models T8775A and T8775C TRADELINE models include a thermostat wallplate for mounting and wiring mounting hardware 4074FAB resistor installation instructions and an owner s guide Electrical Ratings 24 Vac nominal 18 Vac to 30 Vac
12. k white pages of your phone directory 2 Honeywell Customer Care 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 35 Dynamic Drive Scarborough Ontario M1V 479 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 0279 2 T8775A C THE DIGITAL ROUND NON PROGRAMMABLE THERMOSTATS INSTALLATION n 1 5 METERS 1 M19716A Fig 2 Typical thermostat location Separate Wallplate from Thermostat Mount wallplate to wall See Fig 4 as follows 1 Place your thumbs on top of the thermostat and wall plate Use your thumbs to pull the thermostat away from the wallplate See Fig 3 WALL ANCHORS 2 WALL PLATE WALL PLATE M19679 WIRING HOLE 1 INCH SCREW 2 M19499 Fig 3 Separate wallplate from thermostat ween USING WALL ANCHORS DRILL 3 16 IN HOLES FOR DRYWALL 7 32 IN HOLES FOR PLASTER Mount Wallplate to Wall Fig 4 Mount wallplate to wall NOTE Level wallplate for appearance only The thermostat 1 Pullthe thermostat wires through the wiring hole on the functions normally even when not mounted level wallplate 2 Use a pencil to mark the center of the screw holes on the left and right sides of the wallplate 3 Remove the wallplate from the wall and drill two 3 16 in b mm hol
13. ypical wiring diagrams HEATING RELAY OR VALVE COIL POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M19513 Fig 7 Typical hookup of T8775A in a heat only system HEATING FAN RELAY OR RELAY VALVE COIL NPOWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED FACTORY INSTALLED JUMPER M19514 Fig 8 Typical hookup of T8775C in heat only system with fan HEATING RELAY OR VALVE COIL Power SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED FactorY INSTALLED JUMPER M19515 Fig 9 Typical hookup of T8775C in heat cool system with single transformer T8775A C THE DIGITAL ROUND NON PROGRAMMABLE THERMOSTATS COMPRESSOR CONTACTOR HEATING RELAY OR VALVE COIL FUEL SWITCH M19497 Fig 12 Fuel switch power SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED DIP S witc h REMOVE FACTORY INSTALLED JUMPER BETWEEN R AND RC 7 M19517 To adjust the heat cycle rate or the Fahrenheit Celsius temperature display locate DIP switch 1 2 and 3 on the back Fig 10 Typical hookup of T8775C in heat cool system of the thermostat See Fig 13 with two transformers BACK OF THERMOSTAT N SUPPLY PROVIDE DISCONNECT MEANS ES AND OVERLOAD PROTECTION AS REQUIRED DIP SWITCH A A Factory INSTALLED JUMPER A use A JUMPER WIRE NOT S
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