T8112 PROGRAMMABLE THERMOSTAT
68-0170
3
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.
Accessories:
205013 Isolation Relay Kit.
205014 Transformer Plug-in Kit.
205015 International Organization for Standardization
Relay and Transformer.
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
Compatible
with T8112
Gas—Standing Pilot Yes
Gas—Electronic Ignition Yes
Gas-Fired Boilers Yes
a
Gas—
Millivolt 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
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 Valves.
Isolating relay required for 3-wire thermostats for zone valves.
WARNING
ELECTROCUTION HAZARD CAN CAUSE
PROPERTY DAMAGE, SEVERE INJURY, OR
DEATH.
Disconnect power supply before wiring to prevent
electrical shock or equipment damage.
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.
Mounting Plate Installation (Fig. 2)
A Hold mounting plate in position and mark the two holes
for mounting.
B Level for appearance only; thermostat functions
properly even when not level.
C Tighten the mounting screws.
D Set aside the mounting plate.
E 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.
F Reposition the mounting plate over the holes and pull
wires through the wiring opening.
G Loosely insert the two mounting screws into the holes.
WALL
WIRES THROUGH
WALL OPENING
WALL ANCHORS (2)
MOUNTING
PLATE
MOUNTING
SCREWS (2)
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.
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