T841D,E HEATING-COOLING THERMOSTATS
® RECYCLING NOTICE
This control contains mercury in a sealed tube.
Do not place control in the trash at the end of its
useful life.
If this control is replacing a control that contains
mercury in a sealed tube, do not place your old
control in the trash.
Contact your local waste management authority for
instructions regarding recycling and the proper
disposal of this control, or of an old control
containing mercury in a sealed tube.
INSTALLATION
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 gi en in the instructions and on
the product to make sure the product is suitable for
your application.
3. Installer must be a trained, experienced technician.
4. After installation is complete, check out product
operation as pro ided in these instructions.
CAUTION
1. Disconnect power supply to pre ent electrical
shock or equipment damage.
2. Keep wire length to a minimum and run wires
as close as possible to the thermostat.
3. Do not short across coil terminals on relay. This
can burn out the thermostat heat anticipator.
4. Ne er install more than one wire per terminal
unless factory-supplied jumper with spade
terminal is used.
Location
Locate the thermostat about 5 ft (1.5m) abo e the floor in
an area with good air circulation at a erage temperature.
Do not mount the thermostat where it may be affected by:
— drafts, or dead spots behind doors and in corners.
— hot or cold air from ducts.
— radiant heat from sun, appliances or fireplaces.
— concealed pipes and chimneys.
— unheated (uncooled) areas such as an outside wall
behind the thermostat.
This thermostat is a precision instrument and was carefully
adjusted at the factory. Handle carefully.
Mounting and Wiring
The T841 can be mounted directly to a wall or horizontal
outlet box. Choose the method that best fits your
installation.
In replacement applications, check the existing thermo
stat wires for cracked or frayed insulation. Replace any
wires in poor condition. All wiring must comply with local
codes and ordinances.
O Grasp the thermostat co er at the top and bottom
with one hand. Pull out on bottom edge of the co er
until it snaps free of the thermostat base. Carefully
remo e and sa e the packing material surrounding
the mercury switches.
e Run wiring (if necessary) to the location. If the wiring
is plastered into the wall, make a hole next to the
cable and loosen the wires so they can be pushed
back into the wall later. Thread wires through the
hole in packing material sa ed in step 1. Connect
the wires to the terminals on the back of the
thermostat. See Fig. 2 or 3.
© Where applicable, set the adjustable heat anticipator
to match the current draw of the primary heating
control (see Heat Anticipator Setting section).
Q Push the excess wire back through the hole and
plug any opening with packing material to pre ent
drafts that can affect thermostat performance.
0 Loosely secure the thermostat to the wall or outlet
box with screws through the two mounting holes at
the middle of the de ice.
The sheet metal screws included with the thermostat are
designed for use in plaster walls that do not need anchors.
IMPORTANT
An incorrectly leveled thermostat causes
inaccurate temperature control.
0 Exactly le el the thermostat using a spirit le el or
plumb line. Tighten the two mounting screws at the
middle of the de ice.
0 Install two screws in top mounting holes and tighten.
0 Replace the thermostat co er.
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