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Honeywell T8112D Product Data
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Honeywell T8112D Product Data

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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

Programmable Thermostat

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.
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Programming the Thermostat ............................................. 6
Checkout and Settings ........................................................ 7
Troubleshooting ................................................................... 8
T8112D
PRODUCT DATA
Contents
68-0206

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  • Page 1: Table Of Contents

    Features ................1 Specifications ..............2 Ordering Information ............2 Installation ................3 Programming the Thermostat ..........6 Checkout and Settings ............7 Troubleshooting ..............8 ® U.S. Registered Trademark 68-0206 Copyright © 1998 Honeywell Inc. • All Rights Reserved...

  • Page 2: Specifications

    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...

  • Page 3: Installation

    Heat pumps/Multistage Equipment 1. Connect the system wires to the thermostat. See Fig. 3. Compatible with 2-wire Honeywell zone valves. A letter code is located near each terminal for All system types: identification.

  • Page 4: Wiring Diagrams

    T8112D PROGRAMMABLE THERMOSTAT 3-WIRE COOL-ONLY (JUMPER INTACT) JUMPER (FACTORY- INSTALLED) REMOVE INSERT IF 5-WIRE SYSTEM STRAIGHT 5/16 in. UNDER (8 mm) SCREW HEAD STRIP JUMPER END OF WIRE VISIBLE HERE M1712A Fig. 3. Proper wiring technique. COOLING CONTACTOR COIL RELAY (HOT) POWER SUPPLY.

  • Page 5: Install Batteries

    T8112D PROGRAMMABLE THERMOSTAT NOTE: This thermostat does not have a setting for steam/ 5-WIRE HEAT/COOL (JUMPER REMOVED) 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...

  • Page 6: Mounting Thermostat

    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 until the current time displays. To set the day: 1. Press and release the Clock/Day key again.

  • Page 7: Fan/System Switch

    T8112D PROGRAMMABLE THERMOSTAT To check the current temperature setting: Fan Switch Press the Run Program key. (When using TEMPORARILY Auto 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.)

  • Page 8: Minimum Off-Timer

    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.

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