Summary of the content on the page No. 1
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
• Compatible with most 24 Vac standing pilot, gas
electronic ignition, oil or central electric systems.
The T8112D Programmable Thermostat provides energy
savings for single-stage heating and cooling app
Summary of the content on the page No. 2
T8112D PROGRAMMABLE THERMOSTAT Mounting: SPECIFICATIONS Mounts on mounting plate directly on wall. Mounting screws and wall anchors provided. IMPORTANT The specifications given in this publication do not Setpoint Range: include normal manufacturing tolerances; therefore, 45°F to 88°F (7°C to 31°C). an individual unit might not exactly match the listed specifications. Also, this product is tested and Operating Ambient Temperature Range: calibrated under closely controlled conditions, and 40°F to
Summary of the content on the page No. 3
T8112D PROGRAMMABLE THERMOSTAT Mounting Plate Installation (Fig. 2) INSTALLATION 1. Hold mounting plate in position and mark the two holes for mounting. When Installing this Product… 2. Level for appearance only; thermostat functions 1. Read these instructions carefully. Failure to follow the properly even when not level. instructions can damage the product or cause a 3. Tighten the mounting screws. hazardous condition. 4. Set aside the mounting plate. 2. Check the ratings
Summary of the content on the page No. 4
T8112D PROGRAMMABLE THERMOSTAT JUMPER (FACTORY- 3-WIRE COOL-ONLY (JUMPER INTACT) INSTALLED) REMOVE INSERT IF 5-WIRE SYSTEM A C STRAIGHT 5/16 in. UNDER (8 mm) SCREW HEAD STRIP B D W Y G JUMPER END OF WIRE Rc R VISIBLE HERE M1712A Fig. 3. Proper wiring technique. COOLING CONTACTOR COIL FAN L1 RELAY (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
Summary of the content on the page No. 5
T8112D PROGRAMMABLE THERMOSTAT 5-WIRE HEAT/COOL (JUMPER REMOVED) NOTE: This thermostat does not have a setting for steam/ gravity air. Cycles would not be long enough for A C accurate temperature control. B D NOTE: For condensing furnaces, follow manufacturer W Y G instructions. IMPORTANT When using a high efficiency furnace such as a Rc R 90 percent or greater AFUE (Average Fuel Utilization Efficiency) unit, adjust screw A out one turn and screw B In one tu
Summary of the content on the page No. 6
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 s or t until the current time displays. To set the day: 1. Press and release the Clock/Day key again. M5781 2. Press the Time keys s or t until the current day displays. Fig. 10. Removing battery door. 3. Press the Run Program key. INSTALL TWO AA ALKALINE BATTERIES AS SHOWN Heating Program To set the
Summary of the content on the page No. 7
T8112D PROGRAMMABLE THERMOSTAT To check the current temperature setting: Fan Switch Press the Run Program key. (When using TEMPORARILY Auto On FAN AUTO: Normal setting for most homes. A CHANGE or HOLD, pressing this key will cancel the change single-speed fan turns on automatically with or hold.) M1705 the air conditioner or furnace. A two-speed fan usually runs on high with the air conditioner and on low with the furnace. To check the programs: Auto On FAN ON: The fan runs continuously. Use for
Summary of the content on the page No. 8
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-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 IF… THEN… Display will not come
