Honeywell T8112D User Manual

Programmable Thermostat

GENERAL

The T8112D Programmable Thermostat provides energy savings for single-stage heating and cooling applications while providing reliable, precise temperature control.

T8112D

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.

• Compatible with most 24 Vac standing pilot, gas electronic ignition, oil or central electric systems.

• Requires two AA alkaline batteries.

bAt Lo

• LCD flashes

indicating low battery power.

• Isolated heating/cooling circuits.

Contents

General ............................................................................... 1

Features .............................................................................. 1

Specifications ...................................................................... 2

Ordering Information ........................................................... 2

Installation ........................................................................... 3

Programming the Thermostat ............................................. 6

Checkout and Settings ........................................................ 7

Troubleshooting ................................................................... 8

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T8112D PROGRAMMABLE THERMOSTAT

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.

Model:

T8112D Thermostat: Provides electronic programmable control for 24 to 30 Vac heating and cooling systems.

Programming Keys:

Eight program keys.

Electrical Rating:

Battery operated (2 AA alkaline batteries).

System and Fan Ratings:

1.2A run; 7.5A inrush. Total cooling and fan load not to exceed 1.2A.

Dimensions:

See Fig. 1.

Mounting:

Mounts on mounting plate directly on wall. Mounting screws and wall anchors provided.

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).

Temperature Display:

Fixed or field selectable.

Operating Relative Humidity:

5 to 90 percent RH; noncondensing.

Time Indication:

12 hour with AM, PM indication.

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).

Calibration:

Thermostat and thermometer self-calibrating to ±1.25°F.

3/4 (19)

6-7/8 (175)

(102)

1(25)

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, 18 Minneapolis, Minnesota 55422-4386

85 Douglas Drive North

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.

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T8112D PROGRAMMABLE THERMOSTAT

INSTALLATION

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

Check Table 1 to make sure the thermostat is compatible with the intended system.

Table 1. Compatibility Chart.

System Type

Gas—Standing Pilot Yes Gas—Electronic Ignition Yes Gas-Fired Boilers Yes Gas—

Millivolt No

Oil-Fired Boilers Yes Oil-Fired Furnace Yes Electric Furnace Yes Electric Air Conditioning Yes

Baseboard Electric (120/240 Line Volt) No Heat pumps/Multistage Equipment No

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.

Compatible

with T8112D

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 .

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.

WALL ANCHORS (2)

WIRES THROUGH WALL OPENING

WALL

MOUNTING PLATE

MOUNTING SCREWS (2)

Fig. 2. Mounting plate installation.

M1718

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.

NOTE: Hold the thermostat as shown in Fig. 4 to

minimize the need for wire e xtenders .

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.

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.

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