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Mercury Notice; Installation - Honeywell T834C Installation Instructions Manual

Heating-cooling triple fuel
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If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash. Dispose of properly.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of this control.


When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check the ratings given in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced service
4. After installation is complete, check out product
operation as provided in these instructions.
Disconnect power supply before beginning
installation. Can cause electrical shock or
equipment damage.
Locate the thermostat about 5 ft (1.5m) above the floor on
an inside wall 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 or in a corner.
— hot or cold air from ducts.
— radiant heat from the sun, fireplaces or appliances.
— unheated (uncooled) areas such as outside walls
behind the thermostats.
This thermostat is a precision instrument and was carefully
Handle it carefully
adjusted at the factory.
Wiring and Mounting
All wiring must comply with local codes and ordinances.
The T834C Thermostat can be mounted directly on a wall
or on a vertical or horizontal outlet box. The 209649A
(taupe) Mounting Plate Assembly allows mounting on a
vertical or horizontal outlet box and can also be used to
cover wall marks.
If the mounting plate assembly is used, review the
instructions provided with the assembly before wiring and
mounting the thermostat.
To wire and mount the thermostat:
Disconnect power supply before beginning
installation. Can cause electrical shock or
equipment damage.
In replacement applications, check the existing
thermostat wires for cracked or frayed insulation.
Replace any wires in poor condition. If the wire is
plastered into the wall, make a hole next to the wires
and loosen the wires so they can be pushed back
into the wall later.
In new installations, run wiring (if necessary) to the
thermostat location.
Connect the wires to the terminals on the back of the
thermostat. See Fig. 3 and 4 for internal schematic
and typical wiring diagrams. If using electric-heat
compatible thermostats in electric heat applications
without fan sequencers, jumper terminals 1 and 2 to
control fan operation from the thermostat during
heating. See Fig. 2.
Remove the thermostat cover by pulling outward on
the right edge of the cover until it snaps free of the
thermostat base. Carefully remove and discard the
foam plastic shipping insert protecting the switch
and bimetal assembly.
Set the adjustable heat anticipator indicator to match
the current draw of the primary heating control (see
Heat Anticipator Settings section).
Push the excess wire back through the hole and
plug any opening with insulation to prevent drafts
that may affect thermostat performance.
Loosely fasten the thermostat (with wallplate, if
applicable) to the wall or outlet box with a screw
through the left mounting hole. Adjust the thermostat
so that it is approximately level and fasten the
second screw through the right mounting hole. Do
not tighten.



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