Honeywell T834C Bedienungsanleitung

® U.S. Registered Trademark

INSTALLATION INSTRUCTIONS

69-1688

T834C Heating and

Cooling Thermostat

APPLICATION

The T834C 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.

Fig. 1. T834C internal view.

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 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

technician.

4. After installation is complete, check out the product

operation as provided in these instructions.

Table 1. T834C Specifications.

Model No. Application Heat Anticipation

Switching

See Fig.

No.System Fan

T834C For use in standard heating-

cooling systems.

0.18A to 1.0A,

adjustable.

Heat-Off-

Cool

On-Auto 2

.18

.25

WITCH

TEMPERATURE

SETTING LEVER

MOUNTING HOLE

SYSTEM

SWITCH

ADJUSTABLE HEA

ANTICIPATOR

INDICATOR

BIMETAL ELEMEN

BEHIND SCALE

MOUNTING HOLE

(THERMOSTAT

TO WALL OR

OUTLET BOX)

M2118

69-1688.fm Page 1 Tuesday, May 6, 2003 10:05 AM

T834C HEATING AND COOLING THERMOSTAT

69-1688 2

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 T834C can be mounted directly on a wall or vertical

outlet box:

Use the 209649A (taupe) or 209650A (white)

Universal Cover Plate (ordered separately) to mount

on outlet box or to cover wall marks left by old

thermostat.

If the cover plate is used, review the instructions pro-

vided with it 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

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. 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 Fig. 2 for internal schematic

and typical hookup diagram.

5. 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.

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 top mounting hole. Adjust the

thermostat so it is approximately level and fasten

the second screw through the bottom 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. 1.

10. Carefully replace the thermostat cover.

IMPORTANT

An incorrectly leveled thermostat causes the

temperature control to deviate from setpoint.

Fig. 2. Internal schematic and typical hookup for T834C in standard heating-cooling system.

TEMP. FALL C1

1POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED. HEAT RELAY

COOL

OFF

HEAT

COOL

OFF

HEAT

SYSTEM

SWITCH

ANTICIPATOR

M21181

(HO

FAN RELAY

FAN

SWITCH

AUTO G

COOL RELAY

69-1688.fm Page 2 Tuesday, May 6, 2003 10:05 AM

T834C HEATING AND COOLING THERMOSTAT

3 69-1688

SETTINGS AND ADJUSTMENTS

Temperature Setting

Push the temperature setting lever to the desired control

point on the temperature scale. The same lever controls

the temperature setting for either heating or cooling.

System and Fan Switching

The T834C has System and Fan switches to control the

heating-cooling systems and fan.

The System switch controls system operation:

Heat: Operates only heating system.

Off: Both heating and cooling systems are

disconnected.

Cool: Operates only cooling system.

The Fan switch controls fan operation:

Auto: For gas-or oil-fired systems; the fan operates in

response to the thermostat in cooling and in

response to the plenum fan control in heating.

On: The fan runs continuously.

To switch positions, use thumb and index finger to slide

lever to desired position. Stop switch lever in detent

directly over desired position. Stop switch lever in detent

directly over desired function indicator mark for correct

circuit operation.

Heat Anticipator Setting

IMPORTANT

The T834C Thermostat has an adjustable heat

anticipator and operates correctly only if the

anticipator is adjusted to match the current draw

of the primary control. Use this thermostat only

on systems with current draw that falls within

the range of the heat anticipator. Do not use this

device on Powerpile® Systems (millivolt).

Look for the current rating stamped on the nameplate of

the primary control. Set the adjustable heat anticipator

indicator to match the value shown on the nameplate.

If the current rating is not available, proceed as follows to

determine the rating:

1. Turn off the power.

2. Wire the thermostat, but do not mount it on the

wall.

3. Connect the ammeter between the W wire and the

W terminal on the thermostat (in series with the

primary control).

4. Prepare the system for operation.

5. Turn on the power.

6. Turn the System switch to Heat.

7. Increase the thermostat setpoint, as necessary, to

begin operating the system.

8. With the system operating through the ammeter,

wait one minute, then read the ammeter.

9. Turn the System switch to Off and turn off the

power.

10. Adjust the heat anticipator to match the ammeter

reading.

11. Disconnect the ammeter, reconnect the W wire,

and mount the thermostat.

NOTE: For best performance, the heat anticipator may

require further adjustment. To lengthen burner-

on time, move the indicator in the direction of

the longer arrows but not more than one-half

scale marking at one time. To shorten burner-on

time, move the indicator in the opposite

direction.

CHECKOUT

CAUTION

Equipment Damage Hazard.

Heat anticipator can be damaged.

Do not check operation by shorting across

system control terminals.

IMPORTANT

To assure accurate temperature control, do not

touch or breathe on bimetal or thermometer.

Heating

With System switch set at Heat, and Fan switch set at

Auto, move the temperature setting lever about 10°F

(6°C) above room temperature:

Gas or oil-fired systems: heating should start; fan

should start after a short delay.

Move the temperature setting lever about 10°F (6°C)

below room temperature:

Gas or oil-fired systems: heating should shut off and

fan should shut off after a short delay.

69-1688.fm Page 3 Tuesday, May 6, 2003 10:05 AM

69-1688 G.H. 05-03 www.honeywell.com/yourhome

T834C HEATING AND COOLING THERMOSTAT

Printed in U.S.A. on recycled

paper containing at least 10%

post-consumer paper fibers.

Automation and Control Solutions

Honeywell International Inc. Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North 35 Dynamic Drive

Golden Valley, MN 55422 Scarborough, Ontario

M1V 4Z9

Cooling

CAUTION

Equipment Damage Hazard.

Air conditioning equipment (compressor) can

be damaged.

Do not operate cooling when outdoor

temperature is below 50°F (10°C). Refer to

manufacturer’s recommendations.

IMPORTANT

To prevent compressor short cycling, some

manufacturer’s equipment includes a minimum-

off timer to provide a five-minute time delay

from when the thermostat last turned off the

compressor, or from when the system first

received power. This delay protects the com-

pressor.

WIth the System switch set at Cool and the Fan switch

set to Auto, move the temperature setting lever about

10°F (6°C) below room temperature. Cooling and fan

should start (see Important above). Move the

temperature setting lever about 10°F (6°C) above room

temperature. Cooling and fan should shut off.

Fan

With the System switch set to Off and the Fan switch set

to On, the fan should run continuously. Move the Fan

switch to Auto. In gas- or oil-fired systems, fan operation

is controlled by the plenum fan control in heating and by

the thermostat in cooling.

Recalibration

These thermostats are calibrated at the factory and

should not need recalibration. If the thermostat seems

out of adjustment, first check for accurate leveling.

To check calibration:

1. Move the temperature setting lever to the lower

end of the temperature scale. Place the System

switch to the Off position. Wait at least five min-

utes.

2. Remove the thermostat cover. Move the setting

lever until the switch just makes contact. (The mer-

cury in the switch rolls to the left end of the tube.)

3. Replace the cover and wait five minutes for the

cover and the thermostat to lose the heat it has

gained from your hands. If the thermometer pointer

and the setting lever indicator read approximately

the same, no recalibration is needed.

If recalibration appears necessary:

1. Place the temperature setting lever at the same

setting as the thermometer. Remove the cover by

pulling out on the right edge of the cover until it

snaps free of the thermostat base.

2. Insert the 104994A Calibration Wrench (ordered

separately) onto the hex nut under the coil. (See

Fig. 3.) Holding the setting lever so it does not

move, turn the wrench clockwise until the mercury

rolls to the right end of the tube. Remove the

wrench and replace the cover.

IMPORTANT

To assure accurate temperature control, do not

touch or breathe on bimetal or thermometer.

3. Move the setting lever to a lower setting. Wait at

least five minutes for the temperature to stabilize.

4. Slowly move the setting lever until it reads the

same as the thermometer.

5. Remove the cover. Holding the setting lever so it

does not move, reinsert the wrench and carefully

turn it counterclockwise just until the mercury rolls

to the left end of the tube but no farther.

6. Recheck the calibration. Set the thermostat

System switch for the desired operation.

7. Adjust the temperature setting lever so the mercury

bulb is in position as shown in Fig. 3.

8. Carefully replace the thermostat cover.

Fig. 3. Recalibrating the thermostat.

CALIBRATION

WRENCH

COIL SHOWN WITHOU

HEAT ANTICIPATOR

M2044A

69-1688.fm Page 4 Tuesday, May 6, 2003 10:05 AM

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