Honeywell D User's Manual
Contents
1.2. Too warm or too cool Press Run Program key to check the current temperature setting If desired change the temperature setting See the Owner s Manual SYSTEM ON indicator is lit but no heat Allow time for the furnace to heat up and the fan to come on before is coming from the registers checking for heat at the register Check to make sure the Cycle Rate in the Installation section is correct Thermostat current temperature setting Check that the wiring hole in the wall behind the wallplate has been does not match the display temperature plugged with insulation to prevent drafts that might adversely affect to within 1 thermostat operation Be aware that it is normal for the current setting and display temperature to differ on occasion During recovery from setback or setup setting and display temperatures can differ for up to 30 minutes after recovery period bAtLo remains on display after batteries Remove batteries Wait one hour Install fresh Alkaline batteries are installed NOTICE This equipment is a Class B digital apparatus which complies with Canadian Radio Interference Regulations CRC c 1374 7 69 0917 2 Honeywell Home and Building Control Home and Building Control Honeywell Inc Honeywell Limited Honeywell Limit e Honeywell Plaza 155 Gordon Baker Road P O Box 524 North York Ontario Minneapolis MN 55408 0524 M2H 3N7 69 0917 2 G H Rev 4 98 Printed in Mexico www honeywell com
3. as soon as possible after the indicator starts flashing If the batteries are not replaced sometime during the flashing bAt Lo the indicator eventually stops flashing bAt Lo will stay on without flashing indicating the thermostat and heating cooling system have stopped working and the batteries are almost completely dead After the batteries are completely dead the bAt Lo indicator disappears leaving a completely blank display To remove press down on left ends of batteries If 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 incorrectly installed and the thermostat has to be reprogrammed See Owner s Manual for programming instructions SETTINGS Current Time Day To set time press and release the Set Clock Day key once Press the Time keys until the current time shows To set day press and release the Set Clock Day key again Press the Time keys until the current day shows Press Run Program key See Owner s Manual for complete programming instructions Fan Switch FAN AUTO Normal setting for most homes A single speed fan turns on automatically with the air conditioner of furnace A two speed fan usually runs on high with the air conditioner and on low with the furnace NOTE When Fan Operation Switch on the back of the thermostat is in E position the fan operat
4. i 1 HeaTiNG system FURL SWITCH fl AAN BAN F 1 B FURNACE HOT WATER A OUT B N F 1 BOILER 1TURN i 1 ELECTRIC aN B OUT E 1 FURNACE 1 TURN i I FOR HIGH EFFICIENCY FURNACE 00 AFUE Y GY i ADJUST SCREW A OUT 1 TURN y b J L P 1 BAIN DUM QT i FUEL SWITCH F POSITION GG t a 1 1 FUEL SWITCH ac 1 1 o 1 i i ES PR GAL AC i i 4 9 dun 1 Fig 3 Back view of thermostat Wiring Thermostat All wiring must comply with local electrical codes and ordinances Refer to Fig 4 through 7 for typical hookups A letter code is located near each terminal for identification See Table 1 for terminal cross referencing information N CAUTION Disconnect power before wiring to prevent electrical shock or equipment damage 1 Connect the system wires to the thermostat See Fig 8 A letter code is located near each terminal for identification NOTE Hold the thermostat as shown in Fig 9 to minimize need for wire extenders 2 Securely tighten each terminal screw 3 Push excess wire back into the hole 4 Plug hole with nonflammable insulation to prevent drafts from affecting the thermostat Table 1 Typical Wire Colors and Functions Thermostat Connect to Terminal Wire Colora Function Fea Furnace Power a Wire colors are typical verify at heating cooling equipment connection T8112C D ELECTRONIC PROGRAMMABLE THERMOSTATS 2 WIRE HEAT ONLY JUMPER INTACT JUMPER HEAT
5. Honeywell T8112C D Electronic Programmable Thermostats APPLICATION The T8112C D thermostats provide electronic programmable control for 24 to 30 Vac heating and cooling systems 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 the old thermostat INSTALLATION When Installing this Product 1 Read these instructions carefully Failure to follow them could 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 1 Disconnect power supply to prevent electrical shock or equipment damage 2 After wiring is complete push excess wire back into the hole and plug hole with nonhardening caulk putty or insulation to prevent drafts from affecting thermostat operation GU S Registered Trademark Copyright O 1998 Honeywell Inc QD All Rights Reserved INSTALLATION INSTRUCTIONS Location Install the thermostat about 5 ft 1 5m above the floor in an area with good air circulation at average temperature Do not install the thermostat where it c
6. ING RELAY OR VALVE COIL A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M1709B Fig 4 Typical hookup in two wire lead only jumper intact application 4 WIRE HEAT COOL JUMPER INTACT JUMPER HEATING COOLING RELAY OR CONTACTOR VALVE COIL COIL L1 7 HOT 2 gt ZA POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED inion Fig 5 Typical hookup in four wire heat and cool jumper intact application 5 WIRE HEAT COOL JUMPER REMOVED HEATING Em RELAY OR EA VALVE COIL COOLING CONTACTOR A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M1711B Fig 6 Typical hookup in five wire heat and cool jumper removed application 3 WIRE COOL ONLY JUMPER INTACT JUMPER COOLING CONTACTOR COIL EA EA 1 HOT 2 A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M848A Fig 7 Typical hookup in three wire cool only jumper intact application 69 0917 2 T8112C D ELECTRONIC PROGRAMMABLE THERMOSTATS JUMPER FACTORY T8112C INSERT INSTALLED REMOVE IF 5 WIRE SYSTEM 5 16 in NECEM A ENGAGE TABS AT TOP OF B PRESS LOWER EDGE 8 mm THERMOSTAT AND MOUNTING PLATE OF CASE TO LATCH SCREW HEAD STRIP GG OF WIRE VISIBLE HERE M1712A Fig 8 Proper wiring technique M5780 T8112D A ENGAGE TABS AT TOP OF B PRESS
7. LOWER EDGE THERMOSTAT AND MOUNTING PLATE OF CASE TO LATCH M3002A Fig 9 Holding thermostat while installing C SWING COVER OPEN TO Mounting Thermostat on Mounting Plate eee es 1 Engage tabs at the top of thermostat and mounting plate See Fig 10 2 Press lower edge of case to latch NOTE To remove the thermostat from the wall first pull out at the bottom of the thermostat remove top last M13063 Fig 10 Mounting thermostat on mounting plate 69 0917 2 4 T8112C D ELECTRONIC PROGRAMMABLE THERMOSTATS Installing Batteries IMPORTANT Batteries must be installed for programming and operation of the thermostat and heating cooling system 1 Use two AA alkaline batteries nonalkaline batteries will not last as long and can leak causing damage to the thermostat or wall surface Energizer batteries are recommended 2 Make sure the thermostat is set in the OFF position 3 Use a coin to remove the battery door See Fig 11 4 Install the new batteries making sure positive and negative terminals are oriented correctly See Fig 12 5 Replace battery door Fig 11 Removing battery door INSTALL TWO AA ALKALINE BATTERIES AS SHOWN FAN SWITCH SYSTEM SWITCH M5782 Fig 12 Installing batteries As the batteries are running low a bAt Lo indicator flash for one to two months before batteries run out completely Replace the batteries
8. am if necessary Heating will not come on Check that switch on thermostat is set to HEAT Allow a minimum of five minutes for time guard protection to expire Check the system fuse or circuit breaker and replace or reset if necessary Check for correct wiring and good connections Disconnect and jumper wires R and W If heat does not come on check out the heating system f display is blank or says bAt Lo install fresh batteries Cooling will not come on Check that switch on thermostat is set to COOL Allow a minimum of five minutes for time guard protection to expire Check the system fuse or circuit breaker and replace or reset if necessary Check for correct wiring and good connections Disconnect and jumper wires R and Y If cooling does not come on check out the cooling system f display is blank or says bAt Lo install fresh batteries The thermostat has a built in time delay on cooling Allow at least five minutes after changing the setting before the air conditioner starts Make sure outdoor disconnect is engaged on If temperature setting is lower than current temperature and SYSTEM ON indicator is lit move system switch from COOL to OFF for ten minutes After ten minutes return switch to COOL position If air conditioner comes on compressor could have reached its high limit temperature protection and shut down If 2 or 4 wire installation verify that R Rc jumper is installed
9. an be affected by drafts or dead spots behind doors and in corners hot or 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 Mounting Plate Installation Position mounting plate on the wall Use a level to make sure mounting plate is level Use a pencil to mark the two mounting holes See Fig 1 WALL ANCHORS 2 WIRES THROUGH el WALL OPENING MOUNTING SCREWS 2 Fig 1 Mounting plate installation M1718 69 0917 2 T8112C D ELECTRONIC PROGRAMMABLE THERMOSTATS 1 Remove mounting plate from the wall and drill 3 16 inch holes in wall if drywall as marked For firmer material such as plaster or wood drill 7 32 inch holes Gently tap anchors provided into drilled holes until flush with the wall 2 Reposition mounting plate over holes pulling wires through wiring opening Loosely insert two mounting screws into holes 3 Level for appearance only the thermostat will function properly even when not level Tighten mounting screws See Fig 2 LEVEL M1714A Fig 2 Leveling mounting plate Adjust Fan Operation Switch as Required The Thermostat fan operation switch labeled FUEL SWITCH is factory set in the F position See Fig 4 This is the correct setting for most systems If your system is an electric heat system set the switch to E The E set
10. eating should start and the fan should run after a short delay immediately if fan operation switch is set in E position Press key until setting is about 10 F 6 C below room temperature The heating equipment should shut off Move the system switch to COOL and the fan switch to AUTO Press key until setting is about 10 F 6 C below room temperature The cooling equipment and fan should start Press key until the setting is about 10 F 6 C above room temperature The cooling equipment and fan should stop Move the system switch to OFF and the fan switch to AUTO The system and fan should be off T8112C D ELECTRONIC PROGRAMMABLE THERMOSTATS TROUBLESHOOTING GUIDE Display will not come on Set the system switch to OFF Remove batteries Insert batteries backward for at least five seconds to reset thermostat Correctly replace batteries Display should come on Make sure batteries are fresh and installed correctly Gently clean battery contacts using a soft pencil eraser Do not use anything abrasive on the clips Temperature display will not go lower The temperature setting limit is reached The setting range is 45 F to than 45 F 7 C or higher than 88 F 88 F 7 C to 31 C 31 C during programming Temperature change occurs at the Check the program times for the period in question Be sure that AM and wrong times PM indications are correct Make sure the current day and time are correct Reprogr
11. es with the furnace only FAN ON The fan runs continuously Used for improved air circulation during special occasions or for more efficient electronic air cleaning System Switch System switching positions control thermostat operation as follows 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 69 0917 2 T8112C D ELECTRONIC PROGRAMMABLE THERMOSTATS CHECKOUT Heating Do not check heating system operation by jumpering thermostat terminals at the primary control such as the gas valve zone valve or oil burner control This will damage the thermostat Instead you could jumper R and R wires at the thermostat Cooling To avoid possible compressor damage do not operate the cooling system when outside temperature is below 50 F 10 C See compressor manufacturer instructions for further information NOTE When cooling setting is changed thermostat can delay up to five minutes before turning on the air conditioner This delay protects the compressor 69 0917 2 Fan Move the thermostat system switch to OFF and the fan switch to ON The fan should run continuously With the system switch still in the OFF position move the fan switch to AUTO the fan should stop Move the system switch to HEAT and the fan switch to AUTO Press key until the setting is about 10 F 6 C above room temperature H
12. ting allows the fan to turn on immediately with the heating or cooling in a system where the G terminal is connected Adjust System On time as Required The system 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 accordingly by setting screws A and B on the back of the thermostat Use the heating system table shown in Fig 3 as a guide The system on time should be optimized according to the type of system to minimize room temperature swings Setting the screw out one turn means turning the screw approximately 360 or one complete turn Setting the screw in means tightening the screw completely down In the event that you want longer furnace on time readjust the screws A and B as follows 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 not have a setting for steam gravity air Cycles would not be long enough for accurate temperature control 69 0917 2 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 THERMOSTAT BACK ADJUST SCREWS THROUGH HOLES TO SELECT OPERATION DESIRED A C Q p WARMAIR i 1
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