Honeywell T8112D Owners Manual 68 0170 T8112 Programmable Thermostat
2014-12-11
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T8112D Programmable Thermostat 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. GENERAL The T8112D Programmable Thermostat provides energy savings for single-stage heating and cooling applications while providing reliable, precise temperature control. • 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 ............................................................................... Features .............................................................................. Specifications ...................................................................... Ordering Information ........................................................... Installation ........................................................................... Programming the Thermostat ............................................. Checkout and Settings ........................................................ Troubleshooting ................................................................... ® U.S. Registered Trademark Copyright © 1998 Honeywell Inc. • All Rights Reserved 1 1 2 2 3 6 7 8 68-0206 T8112D PROGRAMMABLE THERMOSTAT Mounting: Mounts on mounting plate directly on wall. Mounting screws and wall anchors provided. 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. 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). Model: T8112D Thermostat: Provides electronic programmable control for 24 to 30 Vac heating and cooling systems. Temperature Display: Fixed or field selectable. Programming Keys: Eight program keys. Operating Relative Humidity: 5 to 90 percent RH; noncondensing. Electrical Rating: Battery operated (2 AA alkaline batteries). Time Indication: 12 hour with AM, PM indication. System and Fan Ratings: 1.2A run; 7.5A inrush. Total cooling and fan load not to exceed 1.2A. Cycles Per Hour Adjustment: Heating: Field adjustable to 3, 6, or 9 cph ±10 percent. Cooling: Factory set at 3 cph ±10 percent (not field adjustable). Dimensions: See Fig. 1. Calibration: Thermostat and thermometer self-calibrating to ±1.25°F. 1(25) 6-7/8 (175) 4 (102) 3/4 (19) 1-1/4 (32) M9349 Fig. 1. T8112 dimensions in in. (mm). ORDERING INFORMATION When purchasing 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 Limitée, 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 2 T8112D PROGRAMMABLE THERMOSTAT INSTALLATION 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. 3. Tighten the mounting screws. 4. Set aside the mounting plate. 5. Drill the two holes in the wall as marked. — Drill 3/16 in. holes for drywall. — Drill 7/32 in. holes for plaster or wood. 6. Reposition the mounting plate over the holes and pull wires through the wiring opening. 7. Loosely insert the two mounting screws into the holes. 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 WALL ANCHORS (2) WIRES THROUGH WALL OPENING Check Table 1 to make sure the thermostat is compatible with the intended system. WALL Table 1. Compatibility Chart. System Type Compatible with T8112D Gas—Standing Pilot Yes Gas—Electronic Ignition Yes Gas-Fired Boilers Yes a Gas— Millivolt MOUNTING PLATE MOUNTING SCREWS (2) No Oil-Fired Boilers Yes a Oil-Fired Furnace Yes Electric Furnace Yes Electric Air Conditioning Yes Baseboard Electric (120/240 Line Volt) No Heat pumps/Multistage Equipment No 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. 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. NOTE: Hold the thermostat as shown in Fig. 4 to minimize the need for wire extenders. 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 thermostat operation. 5. 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 factoryinstalled jumper connecting the terminals R and Rc. 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. 3 68-0206 T8112D PROGRAMMABLE THERMOSTAT Rc R 5/16 in. (8 mm) STRIP 3-WIRE COOL-ONLY (JUMPER INTACT) JUMPER (FACTORYINSTALLED) REMOVE IF 5-WIRE SYSTEM INSERT STRAIGHT UNDER SCREW HEAD A C B D W Y G JUMPER Rc R W Y END OF WIRE VISIBLE HERE G M1712A Fig. 3. Proper wiring technique. COOLING CONTACTOR COIL FAN RELAY L1 (HOT) L2 1 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) A C B D W Y G JUMPER M3002A Fig. 4. Holding thermostat while installing. R 2-WIRE HEAT-ONLY (JUMPER INTACT) A C B D W Y HEATING RELAY OR VALVE COIL COOLING CONTACTOR COIL FAN RELAY JUMPER G Rc L1 (HOT) L2 1 Rc R POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M1710B Fig. 7. 4-wire heat/cool application (jumper intact). HEATING RELAY OR VALVE COIL L1 (HOT) 1 L2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M1709B Fig. 5. 2-wire heat-only application (jumper intact). 68-0206 4 T8112D PROGRAMMABLE THERMOSTAT 5-WIRE HEAT/COOL (JUMPER REMOVED) A C B D W Y G HEATING RELAY OR VALVE COIL FAN RELAY COOLING CONTACTOR COIL 1 NOTE: For condensing furnaces, follow manufacturer instructions. 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). 1 L1 (HOT) L1 (HOT) L2 L2 1 This thermostat does not have a setting for steam/ gravity air. Cycles would not be long enough for accurate temperature control. 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. Rc R NOTE: NOTE: This thermostat does not have a setting for steam/ gravity air. Cycles would not be long enough for accurate temperature control. POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M1711B Fig. 8. 5-wire heat/cool application (jumper removed). Install Batteries Adjust Fan Operation Switch, as Required IMPORTANT Batteries must be installed for programming and operating the thermostat and heating/cooling system. 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. 1. Use two AA alkaline batteries; nonalkaline batteries will not last as long. 2. Make sure the thermostat is set to the Off position. 3. Use a coin to remove the battery door (see Fig. 10). 4. Install the new batteries as shown, making sure positive and negative terminals are oriented correctly (see Fig. 11). 5. Replace the battery door. THERMOSTAT BACK A C B D FOR HIGH EFFICIENCY FURNACE (90%+ AFUE) ADJUST: SCREW A–OUT 1 TURN SCREW B–IN FUEL SWITCH – F POSITION FUEL SWITCH E F ADJUST SCREWS THROUGH HOLES TO SELECT OPERATION DESIRED FUEL SWITCH HEATING SYSTEM POSITION WARM AIR A–IN B–IN F FURNACE HOT WATER A–OUT B–IN F 1 TURN BOILER ELECTRIC B–OUT E A–IN FURNACE 1 TURN W Y R 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. G Rc M3669 Fig. 9. Back view of thermostat. 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 incorrectly installed and the thermostat has to be reprogrammed. See Owner’s Manual for reprogramming instructions. 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. 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. 5 68-0206 T8112D PROGRAMMABLE THERMOSTAT 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 ▲ or ▼ until the current time displays. To set the day: 1. Press and release the Clock/Day key again. 2. Press the Time keys ▲ or ▼ until the current day displays. 3. Press the Run Program key. M5781 Fig. 10. Removing battery door. INSTALL TWO AA ALKALINE BATTERIES AS SHOWN Heating Program To set the system switch to HEAT: AM TU Fan 1. Press and release the Schedule key once. WAKE, Mon-Fri , and SET appear on the display. 2. Press the Time keys ▲ or ▼ to program WAKE time, and Temp keys ▲ or ▼ 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 ▲ or ▼ to program WAKE time, and Temp ▲ or ▼ to program WAKE temperature for Sat-Sun. 6. Repeat this sequence for SLEEP. LEAVE Auto On System Cool Off Heat FAN SWITCH SYSTEM SWITCH M5782 Fig. 11. Installing batteries. Mounting Thermostat Cooling Program 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. 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. NOTE: To remove the thermostat from the wall, first pull out the bottom of the thermostat and then remove the top portion. A. ENGAGE TABS AT TOP OF THERMOSTAT AND MOUNTING PLATE. A Quick Guide for Operating or Making Changes B. PRESS LOWER EDGE OF CASE TO LATCH. NOTE: AM TU LEAVE 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 ▲ or ▼. — 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: M5780 1. Press the Hold Temp key. 2. Press the Temp keys ▲ or ▼. 3. To cancel, press the Run Program key. Fig. 12. Mounting thermostat on mounting plate. 68-0206 6 T8112D PROGRAMMABLE THERMOSTAT To check the current temperature setting: Fan Switch Press the Run Program key. (When using TEMPORARILY CHANGE or HOLD, pressing this key will cancel the change or hold.) 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. To check the programs: 1. Press the Schedule key repeatedly to see each time and temperature. 2. Press the Run Program key. To cancel a program: Auto On M1705 Auto On M1706 System Switch 1. Press the Schedule key until the program to cancel appears 2. Press both the Time keys ▲ and ▼ together. COOL: The thermostat controls the air conditioning system. Cool Off Heat M1704 To permanently change a program: OFF: Both the heating and air conditioning systems are off. Repeat the steps in the Heating Program or Cooling Program section as applicable. Cool Off Heat M1707 To return to the normal program: HEAT: The thermostat controls the heating system. Press the Run Program key. Cool Off Heat M1703 CHECKOUT AND SETTINGS After the thermostat is mounted on the mounting plate, check operation as follows: Heating Cool Off Heat 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. M1703 Auto On Move the system switch to HEAT and the fan switch to AUTO. M1705 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 in E position). Temp Press the TEMP key until the setting is about 10°F (6°C) below the room temperature. The heating equipment should shut off. Temp Cool Cooling Off Heat 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. M1704 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. Auto Move the system switch to COOL and the fan switch to AUTO. On M1705 Press the TEMP key until the setting is about 10°F (6°C) below room temperature. The cooling equipment and fan should start. Temp Press the TEMP key until the setting is about 10°F (6°C) above the room temperature. The cooling equipment and fan should stop. Temp Move the system switch to OFF with the fan switch remaining at AUTO. The system and fan should be off. Cool Off Heat M1707 Auto On M1705 7 68-0206 T8112D PROGRAMMABLE THERMOSTAT Minimum Off-Timer If the compressor turns off when the setpoint is changed, then the minimum-off timer is triggered, which operates only during the cooling cycle of the T8112D. A minimum off-timer for the T8112D 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 and when the system switch is changed. TROUBLESHOOTING IF… Display will not come on. Temperature display will not go lower than 45°F (7°C) or higher than 88°F (31°C) during programming. Heating will not come on. Cooling will not come on. THEN… • 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. • Make sure batteries are fresh and installed correctly. • The temperature setting limit has been reached. The setting range is 45°F to 88°F (7°C to 31°C). • • • • • • • • • • SYSTEM ON indicator is lit, but no heat is coming from the registers. • Furnace or air conditioner cycles too frequently. The system on-time is too short or too long. The thermostat current setting does not match the display temperature. • bAt Lo remains on the display after fresh batteries have been installed. Home and Building Control Honeywell Inc. 1985 Douglas Drive North Golden Valley, MN 55422 68-0206 L.C. 2-98 Printed in U.S.A. If the display is blank or displays bAt Lo, install fresh batteries. Check that the switch on the thermostat is set to HEAT. Check the system fuse or circuit breaker and replace or reset if necessary. If the temperature setting is higher than the current temperature, and SYSTEM ON indicator is lit, see the furnace manufacturer instructions. If the display is blank or displays bAt Lo, install fresh batteries. In 2- or 4-wire installations, verify that the R-Rc jumper is installed. Check that the switch on the thermostat is set to COOL. Check the system fuse or circuit breaker and replace or reset if necessary. The thermostat has a built-in time delay on cooling. Allow five to ten minutes after changing the setting before the air conditioner starts. If the temperature setting is lower than the current temperature, and the SYSTEM ON indicator is lit, see the air conditioner manufacturer instructions. Allow time for the furnace to heat up and the fan to come on before checking for heat at the register. Check to make sure system on-time is set correctly according to the instructions in the Installation section. Readjust according to the instructions in the Installation Section. • Readjust according to the instructions in the Installation Section. • Check that the wiring hole in the wall behind the wallplate was plugged with insulation to prevent drafts that could adversely affect thermostat operation. • It is normal for the current setting and display temperature to differ occasionally. • Remove batteries. Wait one hour. Install fresh alkaline batteries. Home and Building Control Honeywell Limited-Honeywell Limitée 155 Gordon Baker Road North York, Ontario M2H 3N7 8 Printed on recycled paper containing at least 10% post-consumer paper fibers. www.honeywell.com/yourhome
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