Honeywell Thermostat T8112D User's Manual
Contents
1. a program 1 Press the Schedule key until the program to cancel appears 2 Press both the Time keys A and together To permanently change a program Repeat the steps in the Heating Program or Cooling Program section as applicable To return to the normal program Press the Run Program key CHECKOUT AND SETTINGS T8112D PROGRAMMABLE THERMOSTAT Fan Switch FAN AUTO Normal setting for most homes A single speed fan turns on automatically with the air conditioner or furnace A two speed fan usually runs on high with the air conditioner and on low with the furnace FAN ON The fan runs continuously Use for improved air circulation during special occasions or for more efficient electronic air cleaning System Switch COOL The thermostat controls the air conditioning system OFF Both the heating and air conditioning systems are off HEAT The thermostat controls the heating system After the thermostat is mounted on the mounting plate check operation as follows Do not check the heating system operation by jumpering the thermostat terminals at the primary control such as the gas valve zone valve or oil burner control This will damage the thermostat Move the system switch to HEAT and the fan switch to AUTO Press the TEMP key until the setting is about 10 F 6 C above the room temperature After a short delay the heating should start and the fan should run immediately if fan operation switch is set i2. off timer is triggered which operates only during after it turns off The minimum off timer is triggered when the the cooling cycle of the T8112D compressor turns off and when the system switch is changed TROUBLESHOOTING Display will not come on e Set the system switch to OFF remove batteries insert backward for at least five seconds to reset thermostat replace batteries correctly Display should come on e Make sure batteries are fresh and installed correctly Temperature display will not go lower The temperature setting limit has been reached The setting range is 45 F to 88 F than 45 F 7 C or higher than 88 F 7 C to 31 C 31 C during programming Heating will not come on e f the display is blank or displays bAt Lo install fresh batteries e Check that the switch on the thermostat is set to HEAT e Check the system fuse or circuit breaker and replace or reset if necessary e If the temperature setting is higher than the current temperature and SYSTEM ON indicator is lit see the furnace manufacturer instructions Cooling will not come on e If the display is blank or displays bAt Lo install fresh batteries e In 2 or 4 wire installations verify that the R Rc jumper is installed e Check that the switch on the thermostat is set to COOL e Check the system fuse or circuit breaker and replace or reset if necessary e The thermostat has a built in time delay on cooling Allow five to ten minutes after changing
3. 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 Model T8112D Thermostat Provides electronic programmable control for 24 to 30 Vac heating and cooling systems Programming Keys Eight program keys Electrical Rating Battery operated 2 AA alkaline batteries System and Fan Ratings 1 2A run 7 5A inrush Total cooling and fan load not to exceed 1 2A Dimensions See Fig 1 6 7 8 175 Honeywell Mounting Mounts on mounting plate directly on wall Mounting screws and wall anchors provided Setpoint Range 45 F to 88 F 7 C to 31 C Operating Ambient Temperature Range 40 F to 110 F 4 C to 43 C Shipping Temperature Range 20 F to 120 F 29 C to 49 C Temperature Display Fixed or field selectable Operating Relative Humidity 5 to 90 percent RH noncondensing Time Indication 12 hour with AM PM indication Cycles Per Hour Adjustment Heating Field adjustable to 3 6 or 9 coh 10 percent Cooling Factory set at 3 coh 10 percent not field adjustable Calibration Thermostat and thermometer self calibrating to 1 25 F ja 1 25 gt 3 4 19 1 1 4 32 M9349 Fig 1 T8112 dimensions in in mm ORDERING INFORMATION When purcha
4. HIGH EFFICIENCY FURNACE 90 AFUE ADJUST SCREW A OUT 1 TURN SCREW B IN Png FUEL SWITCH F POSITION 1C TETE n o FUEL SWITCH o Chae Ya l E l L l TI Fx 4 Fig 9 Back view of thermostat Adjust System On Time as Required The thermostat on time is factory set for a warm air gas or oil heating system If you are installing it on another type of system the system on time must be adjusted by changing the setting of screws A and B on the back of the thermostat Use the heating system table in Fig 9 as a guide to minimize room temperature swings The system on time should be optimized according to the type of system Setting the screw out one turn means turning the screw approximately 360 or one complete turn T8112D PROGRAMMABLE THERMOSTAT NOTE This thermostat does not have a setting for steam gravity air Cycles would not be long enough for accurate temperature control NOTE For condensing furnaces follow manufacturer instructions IMPORTANT When using a high efficiency furnace such as a 90 percent or greater AFUE Average Fuel Utilization Efficiency unit adjust screw A out one turn and screw B In one turn If you want a longer on time readjust screws A and B as follows refer to Table 1 Compatibility Chart Warm Air Furnace set at the Hot Water setting A out one turn B in Electric Furnace leave at the Warm Air Furnace setting A in B in NOTE This thermostat does
5. Honeywell T8112D Programmable Thermostat GENERAL The T8112D Programmable Thermostat provides energy savings for single stage heating and cooling applications while providing reliable precise temperature control U S Registered Trademark Copyright 1998 Honeywell Inc All Rights Reserved PRODUCT DATA FEATURES HEAT OFF COOL System switch AUTO ON Fan switch Separate programs for weekdays and weekends 5 day 2 day Digital LCD display Easy to program and install Precise temperature control Four daily energy saving programs Compatible with most 24 Vac standing pilot gas electronic ignition oil or central electric systems Requires two AA alkaline batteries LCD flashes bAt Lo indicating low battery power Isolated heating cooling circuits Contents General siesccsssseie ae E E i sieces ter E 1 FOAtUICS e c sscccceshesetepcceg saaesteed edi ssietstenndAciets aaaea E 1 Specifications osii ieina EAEE E AREE EE Eii 2 Ordering Information cc cccessceeeseeeeeseeeeeeseeesseeesseeeess 2 Installation siina eaaa anaa ea Eaa ae eak 3 Programming the Thermostat cccceceeeeeeeeeeeeeeeeeeees 6 Checkout and Settings eceeceeeeeeeseeteeeeeeeeseeeseeeeeaeenaes 7 Troubleshooting aricii ait 8 68 0206 T8112D PROGRAMMABLE THERMOSTAT SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing
6. n E position Press the TEMP key until the setting is about 10 F 6 C below the room temperature The heating equipment should shut off Cooling To avoid possible compressor damage do not operate the cooling system when the outside temperature is below 50 F 10 C See the compressor manufacturer instructions for further information NOTE When the cooling setting is changed the thermostat can delay up to five minutes before turning on the air conditioner to protect the compressor Move the system switch to COOL and the fan switch to AUTO Press the TEMP key until the setting is about 10 F 6 C below room temperature The cooling equipment and fan should start Press the TEMP key until the setting is about 10 F 6 C above the room temperature The cooling equipment and fan should stop Move the system switch to OFF with the fan switch remaining at AUTO The system and fan should be off Cool Off a a aM Auto On CH M1705 Auto On L L M1706 Cool Off Heat L L L CO M1704 Cool Off Heat L Li L aD I on M1707 Cool Off Heat L L L aD M1703 Heat E M1703 Auto On L E M1705 Cool Off Heat a a E M1704 Auto On E E 68 0206 T8112D PROGRAMMABLE THERMOSTAT Minimum Off Timer A minimum off timer for the T8112D assures that the cooling If the compressor turns off when the setpoint is changed then compressor does not come on again for at least five minutes the minimum
7. n U S A least 10 post consumer paper fibers www honeywell com yourhome
8. nly application jumper intact 68 0206 JUMPER 3 WIRE COOL ONLY JUMPER INTACT JUMPER COOLING CONTACTOR COIL KA KA L1 HOT 2 gt A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M848A Fig 6 3 wire cool only application jumper intact 4 WIRE HEAT COOL JUMPER INTACT JUMPER HEATING COOLING RELAY OR CONTACTOR VALVE COIL JCOIL BA BA L1 gt HOT L2 gt A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M1710B Fig 7 4 wire heat cool application jumper intact 5 WIRE HEAT COOL JUMPER REMOVED HEATING RELAY OR VALVE COIL COOLING A CONTACTOR A L1 HoT gt A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M1711B Fig 8 5 wire heat cool application jumper removed Adjust Fan Operation Switch as Required The thermostat fan operation switch labeled FUEL SWITCH see Fig 9 is factory set in the F position This is the correct setting for most systems If you have an electric heat system set the switch to E In systems with the G terminal connected the E setting turns on the fan immediately with heating or cooling THERMOSTAT BACK Saw ADJUST SCREWS THROUGH HOLES TO SELECT OPERATION DESIRED i FUEL SWITCH HEATING SYSTEM POSITION I WARMAIR A IN B IN F FURNACE HOT WATER A OUT B IN F BOILER 1 TURN ELECTRIC A IN B OUT E FURNACE 1 TURN FOR
9. not have a setting for steam gravity air Cycles would not be long enough for accurate temperature control Install Batteries IMPORTANT Batteries must be installed for programming and operating the thermostat and heating cooling system 1 Use two AA alkaline batteries nonalkaline batteries will not last as long Make sure the thermostat is set to the Off position Use a coin to remove the battery door see Fig 10 Install the new batteries as shown making sure positive and negative terminals are oriented correctly see Fig 11 Replace the battery door ao FON When the batteries are running low a bAt Lo indicator will flash for one to two months before batteries run out completely Replace the batteries as soon as possible after the indicator starts flashing If the batteries are not replaced when the bAt Lo indicator is flashing the indicator eventually stops flashing When the batteries are almost completely dead bAt Lo will stay on without flashing indicating that the thermostat and heating cooling system have stopped working The thermostat will not function after the batteries are completely dead and the bAt Lo indicator disappears leaving a completely blank display To remove the batteries press down on the left ends When the new batteries are installed within 20 to 30 seconds of removing the old ones the thermostat does not have to be reprogrammed If the display is blank the batteries are dead or incorrectl
10. re the thermostat is compatible with the intended system Table 1 Compatibility Chart System Type a Compatible with 2 wire Honeywell zone valves All system types Not compatible with any 120 240 volt circuit Not designed for steam or gravity systems Not compatible with 2 wire White Rodgers no 1361 zone valves Isolating relay required for 3 wire thermostats for zone valves CAUTION Damage to Heating Cooling System Possible Be careful when handling wires during installation Disconnect power at furnace or main breaker fuse box Location Locate the thermostat about 5 ft 1 5m above the floor in an area with good air circulation at average temperature Do not mount the thermostat where it can be affected by drafts or dead spots behind doors and in corners hot or cold air ducts concealed pipes and chimneys unheated uncooled areas such as an outside wall behind the thermostat T8112D PROGRAMMABLE THERMOSTAT Mounting Plate Installation Fig 2 1 Hold mounting plate in position and mark the two holes for mounting 2 Level for appearance only thermostat functions properly even when not level Tighten the mounting screws Set aside the mounting plate Drill the two holes in the wall as marked Drill 3 16 in holes for drywall Drill 7 82 in holes for plaster or wood 6 Reposition the mounting plate over the holes and pull wires through the wiring opening 7 Loosel
11. sing replacement and modernization products from your TRADELINE wholesaler or your distributor refer to the TRADELINE Catalog or price sheets for complete ordering information or specify 1 Model Number 2 Accessories as 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 Honeywell Home and Building Control Sales Office check white pages of phone directory 2 Home and Building Control Customer Relations Honeywell 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 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 68 0206 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 and in the compatibility chart Table 1 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 Compatibility Check Table 1 to make su
12. splay 2 Press the Time keys A or W to program WAKE time and Temp keys A or W to program WAKE temperature for Mon Fri 3 Repeat this sequence for LEAVE RETURN and SLEEP 4 Press the Schedule key until SAT SUN WAKE and SET appear on the display 5 Press the Time keys A or W to program WAKE time and Temp A or to program WAKE temperature for Sat Sun 6 Repeat this sequence for SLEEP Cooling Program 1 Set the system switch to COOL and follow the same procedure as for the Heating Program 2 After programming adjust the fan and system switches as desired 3 Press and release the Run Program key to start the program A Quick Guide for Operating or Making Changes NOTE The system switch must be set to Heat or Cool to perform the following To temporarily change the temperature for the current period only 1 Press the Temp keys A or V The temporary indicator shows on the display and cancels itself at the next scheduled change 2 To cancel sooner press the Run Program key To hold a temperature indefinitely 1 Press the Hold Temp key 2 Press the Temp keys A or V 3 To cancel press the Run Program key To check the current temperature setting Press the Run Program key When using TEMPORARILY CHANGE or HOLD pressing this key will cancel the change or hold To check the programs 1 Press the Schedule key repeatedly to see each time and temperature 2 Press the Run Program key To cancel
13. the setting before the air conditioner starts e If the temperature setting is lower than the current temperature and the SYSTEM ON indicator is lit see the air conditioner manufacturer instructions SYSTEM ON indicator is lit but no e Allow time for the furnace to heat up and the fan to come on before checking for heat is coming from the registers heat at the register Check to make sure system on time is set correctly according to the instructions in the Installation section Furnace or air conditioner cycles too Readjust according to the instructions in the Installation Section frequently The system on time is too short or too Readjust according to the instructions in the Installation Section long The thermostat current setting does e Check that the wiring hole in the wall behind the wallplate was plugged with not match the display temperature insulation to prevent drafts that could adversely affect thermostat operation e Itis normal for the current setting and display temperature to differ occasionally bAt Lo remains on the display after e Remove batteries Wait one hour Install fresh alkaline batteries fresh batteries have been installed Honeywell Home and Building Control Home and Building Control Honeywell Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 155 Gordon Baker Road Golden Valley MN 55422 North York Ontario M2H 3N7 Printed on recycled paper containing at 68 0206 L C 2 98 Printed i
14. y insert the two mounting screws into the holes oar OW MOUNTING SCREWS 2 M1718 Fig 2 Mounting plate installation Wiring Thermostat All wiring must comply with local electrical codes and ordinances Refer to Fig 5 through 8 for typical hookups A letter code is located near each terminal for identification 1 Connect the system wires to the thermostat See Fig 3 A letter code is located near each terminal for identification NOTE Hold the thermostat as shown in Fig 4 to minimize the need for wire extenders Securely tighten each terminal screw Push excess wire back into the hole Plug the hole with nonflammable insulation to prevent drafts from affecting thermostat operation Run the required number of wires to the thermostat location Refer to Fig 5 through 8 for typical wiring diagrams 6 In 5 wire installations only be sure to remove the factory installed jumper connecting the terminals R and Rc PON a 68 0206 T8112D PROGRAMMABLE THERMOSTAT JUMPER FACTORY INSERT INSTALLED REMOVE ar IF 5 WIRE SYSTEM 5 16 in STRAIGHT 8 mm UNDER Ore SCREW HEAD t S END OF WIRE VISIBLE HERE M1712A Fig 3 Proper wiring technique M3002A Fig 4 Holding thermostat while installing 2 WIRE HEAT ONLY JUMPER INTACT HEATING RELAY OR VALVE COIL A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M1709B Fig 5 2 wire heat o
15. y installed and the thermostat has to be reprogrammed See Owner s Manual for reprogramming instructions IMPORTANT Although the thermostat has a low battery indicator replace the batteries once a year to prevent the thermostat from losing time and programming due to lack of battery power 68 0206 T8112D PROGRAMMABLE THERMOSTAT Fig 10 Removing battery door INSTALL TWO AA ALKALINE BATTERIES AS SHOWN FAN SWITCH SYSTEM SWITCH M5782 Fig 11 Installing batteries Mounting Thermostat 1 Engage the tabs at the top of the thermostat and mounting plate See Fig 12 2 Press the lower edge of the case to latch NOTE To remove the thermostat from the wall first pull out the bottom of the thermostat and then remove the top portion B PRESS LOWER EDGE OF CASE TO LATCH A ENGAGE TABS AT TOP OF THERMOSTAT AND MOUNTING PLATE int Ti aa LY MY M5780 Fig 12 Mounting thermostat on mounting plate 68 0206 PROGRAMMING THE THERMOSTAT Set the Current Time Day To set the time 1 Press and release the Clock Day key once 2 Press the Time keys A or until the current time displays To set the day 1 Press and release the Clock Day key again 2 Press the Time keys A or W until the current day displays 3 Press the Run Program key Heating Program To set the system switch to HEAT 1 Press and release the Schedule key once WAKE Mon Fri and SET appear on the di
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