Honeywell T8034C User Manual

T8034C Heating and

Cooling Thermostat

INSTALLATION INSTRUCTIONS

APPLICATION

The T8034C Thermostat (see Fig. 1) controls 24 to 30 Vac single-stage heating-cooling systems. See Table 1 for
application information. An spdt mercury switch makes R to W on a temperature fall for heating, and R to Y on a
temperature rise for cooling.

Table 1. T8034C Specifications.

Heat-Off­Cool

Switching

Comments

On-Auto TRADELINE® 3

See Fig.

No.System Fan

Model No. Application

T8034C1085 For use in gas- or

oil-fired heating
systems.

Heat

Anticipation

0.18A to 1.0A,
adjustable.

MOUNTING HOLE
(THERMOSTAT
TO WALL OR
OUTLET BOX)

ADJUSTABLE HEAT
ANTICIPATOR INDICATOR

BIMETAL ELEMENT
BEHIND HEAT
ANTICIPATOR
SCALE

.18

.9

.2

.7

.5

.25

L

O

G

N

.35

.3

FAN
SWITCH

SYSTEM
SWITCH

TEMPERATURE
SETTING LEVER

MOUNTING
HOLE

M5601

Fig. 1. T8034C internal view.

® U.S. Registered Trademark
Copyright © 2001 Honeywell • • All Rights Reserved

MERCURY NOTICE

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 an old control.

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 application.

3. Installer must be a trained, experienced service
technician.

4. After installation is complete, check out the product
operation as provided in these instructions.

69-1596

T8034C HEATING AND COOLING THERMOSTAT

Location

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 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 adjusted at the factory. Handle it carefully.

Wiring and Mounting

CAUTION

Electrical Shock Hazard.
Can cause personal electrical shock and
equipment damage.

Disconnect power supply before beginning
installation.

IMPORTANT

All wiring must comply with local codes and
ordinances.

The T8034C can be mounted directly on a wall or
horizontal outlet box:
— Use the 200581 (beige) or 202895A (gray) Horizontal

Wallplate to cover mounting marks from an old

thermostat.
— Use the 19312A (beige) or 202689A (gray) Mounting

Plate Assembly to mount on vertical outlet box or to

cover wall marks where larger plate is needed.

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.

2. In new installations, run wiring (if necessary) to the
thermostat location.

3. Connect the wires to the terminals on the back of
the thermostat. See Fig. 3 for internal schematic
and typical hookup diagram.

4. Remove thermostat cover by pulling outward on
right edge of cover until it snaps free of the thermo­stat base. Carefully remove and discard the foam
plastic shipping insert that protects the switch and
bimetal assembly during shipping.

5. Set the adjustable heat anticipator indicator to
match the current draw of the primary heating con­trol (see Heat Anticipator Setting section).

6. Push excess wire back through the hole and plug
any opening with insulation to prevent drafts that
can affect thermostat performance.

7. 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 it is approximately level and fasten the sec­ond screw through the right mounting hole. Do not
tighten.

8. For optimum performance, level the thermostat
using a spirit level or plumb line. Tighten the
mounting screws.

9. Adjust temperature setting lever so mercury bulb is
in horizontal position as shown in Fig. 2.

10. Carefully replace the thermostat cover.

IMPORTANT

An incorrectly leveled thermostat causes the
temperature control to deviate from setpoint.

The SUPER TRADELINE® T8034C includes the 200581
Horizontal Wallplate. For other T8043C models, order the
horizontal wallplate or mounting plate assembly.

If the horizontal wallplate is used, align the thermostat
and wallplate. See Fig. 2. Press firmly together until
wallplate snaps in place, then wire and mount the
thermostat.

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:

1. In replacement applications, check the existing
thermostat wires for cracked or frayed insulation.
Replace any wires in poor condition. If the wire is

69-1596 2

UP

l

o

o

C

f

f

O

Heat

90
80
70
60

Auto

FAN

n

O

M20287

Fig. 2. Mounting T8034C Thermostat on wallplate.