Honeywell T834C2267, T834C2309, T834C1541, T834C1137 User Manual
TRADELINE
T834C
Heating-Cooling Thermostat
Application
T834C Thermostats control 24 to 30 Vac single-stage heating-cooling systems. See Table 1 for specific models and
applications. An spdt mercury switch makes R to W on a temperature fall for heating, and R to Y on a temperature rise for cooling.
See Fig. 1.
TABLE 1—THERMOSTAT MODELS AND APPLICATIONS.
Model Switching Anticipator See
Number Application System Fan Range Comments Fig.
T834C1137 For use in standard HEAT-OFF- ON-AUTO 0.18 to 1.0A TRADELINE; Beige. 3
T834C1541 For use in gas- or SUPER TRADELINE; 4
T834C2267 For use in gas- or SUPER TRADELINE; 5
T834C2309 For use in standard 0.3 to 1.2A TRADELINE; Beige. 3
a
In electric heat applications without fan sequencers, jumper terminals 1 and 2 to control the fan from the thermostat during
heating.
Fig. 1—Internal view of T834C.
heating-cooling COOL
systems.
oil-fired, or central Beige.
electric heata systems.
oil-fired, single-stage Premier White.
heat pump or central (Jumper included.)
electric heata systems.
heating-cooling
systems.
structions regarding recycling and the proper disposal of this
control, or of an old control containing mercury in a sealed
tube.
1502.
Heat
Contact your local waste management authority for in-
If you have questions, call Honeywell Inc. at 1-800-468-
Recycling Notice
M3375
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.
J. H. • Rev. 2-93 • • ©Honeywell Inc. 1993 • Form Number 69-0434—5
Installation
WHEN INSTALLING THIS PRODUCT...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condition.
2. Check the ratings given in the Instructions and on the
product to make sure the product is suitable for your applica-
tion.
3. Installer must be a trained, experienced service technician.
4. After installation is complete, check out product operation as provided in these Instructions.
CAUTION
Disconnect power supply before beginning installation to prevent electrical shock or equipment
damage.
M3375
LOCATION
Locate the thermostat about 5 ft. [1.5 m] 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 corners.
— hot or cold air from ducts.
— radiant heat from the sun, fireplaces, or appliances.
— unheated (uncooled) areas behind the thermostat, such
as outside walls.
This thermostat is a precision instrument and was carefully adjusted at the factory. Handle it carefully.
MOUNTING AND WIRING
Disconnect power supply before beginning installation to
prevent electrical shock or equipment damage.
All wiring must comply with local codes and ordinances.
The T834C can be mounted directly to a wall or vertical
outlet box. Use Honeywell part no. 193121A (beige) or
202689A (gray) Mounting Plate Assembly (order separately) to mount on horizontal outlet box or cover marks left
by old thermostat. If mounting plate assembly is used, review
instructions provided with assembly before wiring and mounting thermostat. To wire and mount thermostat:
1. 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 that they
can be pushed back into the wall later.
2. In new installations, run wiring (if necessary) to the
thermostat location.
3. Set the adjustable heat anticipator indicator to match
the current draw of the primary heating control or as recommended by the equipment manufacturer (see Heat Anticipator Setting).
4. Connect the wires to the terminals on the back of the
thermostat. See Figs. 3-5 for internal schematic and typical
hookup diagrams. If using electric heat-compatible thermostat in central electric heat applications, jumper terminals 1
and 2 to control fan operation from the thermostat during
heating. See Fig. 2.
Fig. 2—Jumpering thermostat terminals to control
fan operation.
5. Remove thermostat cover by pulling outward on bottom edge until it snaps free of the thermostat base. Carefully
remove and discard the foam plastic shipping insert. This
insert protects the switch and bimetal assembly during shipping.
6. Push excess wire back through the hole and plug any
opening with insulation to prevent drafts that may affect
thermostat performance.
7. Fasten the thermostat to the wall or outlet box with a
screw through the top mounting hole. Adjust the thermostat
so that it is approximately level and fasten the second screw
through the bottom mounting hole. Do not tighten.
8. Exactly level the thermostat using a spirit level or
plumb line. Tighten the mounting screws.
Fig. 3—Internal schematic and typical hookup for T834C1137 and T834C2308 in a standard heating-cooling
system.
M1119A
L1
(HOT)
L2
1
FAN SWITCH
H1
H1
ANTICIPATOR
1
C1
TEMP. FALL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
C1
ANTICIPATOR
AUTO
SYSTEM
SWITCH
COOL
OFF
HEAT
ON
HEAT
OFF
COOL
R
G
Y
W
FAN RELAY
COMPRESSOR
CONTACTOR
HEAT RELAY
2
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