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Honeywell T8112 Manual
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Honeywell T8112 Manual

Honeywell T8112 Manual

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GENERAL

The T8112 Programmable Thermostat provides energy
savings for single-stage heating and cooling applications
while providing reliable, precise temperature control.
® U.S. Registered Trademark
Copyright © 1996 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
T8112
PRODUCT DATA
Contents
68-0170

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Summary of Contents for Honeywell T8112

  • 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 68-0170 Copyright © 1996 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 Logistics Honeywell Inc., 1985 Douglas Drive North...

  • Page 3: Installation

    Fig. 2. Mounting plate installation. Baseboard Electric (120/240 Line Volt) Heat pumps/Multistage Equipment Wiring Thermostat Compatible with 2-wire Honeywell zone valves. All wiring must comply with local electrical codes and All system types: ordinances. Refer to Fig. 5 through 8 for typical hookups. A Not compatible with any 120/240 volt circuit.
  • Page 4 T8112 PROGRAMMABLE THERMOSTAT 2-WIRE HEAT-ONLY (JUMPER INTACT) CAUTION Disconnect power before wiring to prevent electrical shock or equipment damage. JUMPER Connect the system wires to the thermostat. See Fig. 3. A letter code is located near each terminal for identification.
  • Page 5 T8112 PROGRAMMABLE THERMOSTAT 4-WIRE HEAT/COOL (JUMPER INTACT) THERMOSTAT BACK ADJUST SCREWS THROUGH HOLES TO SELECT OPERATION DESIRED FUEL SWITCH HEATING SYSTEM POSITION WARM AIR A–IN B–IN FURNACE A–OUT HOT WATER B–IN BOILER 1 TURN JUMPER ELECTRIC B–OUT A–IN FURNACE 1 TURN...

  • Page 6: Programming The Thermostat

    T8112 PROGRAMMABLE THERMOSTAT Use two AA alkaline batteries; nonalkaline batteries will Mounting Thermostat not last as long. Engage the tabs at the top of the thermostat and Make sure the thermostat is set to the Off position. mounting plate. See Fig. 12.

  • Page 7: Checkout And Settings

    T8112 PROGRAMMABLE THERMOSTAT After programming, adjust the fan and system switches To check the current temperature setting: as desired. Press the Run Program key. (When using TEMPORARILY Press and release the Run Program key to start the CHANGE or HOLD, pressing this key will cancel the change program.

  • Page 8: Troubleshooting

    T8112 PROGRAMMABLE THERMOSTAT Fan Switch System Switch Auto Cool Heat FAN AUTO: Normal setting for most homes. A COOL: The thermostat controls the air single-speed fan turns on automatically with conditioning system. the air conditioner or furnace. A two-speed fan...