Honeywell T7079A Operation manual

PRODUCT DATA

Put UPC Code Here

63-2572—04

T7079A,B

Solid State

Remote Temperature Controllers

APPLICATION

The T7079 Electronic Remote Sensor Temperature Controller

is capable of providing on-off temperature control for ducts,

tanks, heating and refrigeration units, greenhouses, animal

confinement buildings and other applications where electronic

accuracy in addition to remote sensing is desired.

FEATURES

• Switch selection of heat or cool mode.

• Temperature sensing up to 400 feet.

• Does not require field calibration.

• 10K NTC temperature sensor.

• Wide setpoint temperature range.

• LED annunciation for both power on and relay state.

• Dual setpoint scale (°F and °C).

• Isolation transformer for 24 Vac input.

• Single- or Dual-stage output.

• Dual-stage output models can be configured as

two-heat, two-cool, or one-heat/one-cool.

Contents

Application ........................................................................1

Features ...........................................................................1

Specifications ....................................................................2

Ordering Information .........................................................2

Installation ........................................................................3

Wiring ...............................................................................4

Operation ..........................................................................5

Checkout ..........................................................................6

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

63-2572—04 2

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the

TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or

phone:

1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386

In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.

International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France,

Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

SPECIFICATIONS

Models:

T7079: On-off wall-mount control with one temperature input

and one or two relay output stages. Differential range of

1 to 30°F. Includes one sensor. See Table 1.

Table 1. T7079 models.

Dimensions: See Fig. 1.

Fig. 1. Dimensions of T7079 in in. (mm).

Electrical Ratings:

Voltage Input: 24 Vac, 50/60 Hz (+10%, -15%), Class 2 only.

120/230 Vac, 50/60 Hz (+10%, -15%).

Power Consumption: See Table 2.

Table 2. Power consumption ratings.

Contact Ratings:

At 120 Vac: 1/2 hp, 9.8 FLA, 58.8 LRA.

At 230 Vac: 1/4 hp, 4.9 FLA, 29.4 LRA.

At 120/230 Vac: 125 VA pilot duty.

At 24 Vac (resistive): 8A.

Ambient Ratings:

Operating Temperature: -40°to 140°F (-40°to 60°C).

Storage Temperature: -40°to 180°F (-40°to 82°C).

Operating Humidity: 5% to 95% RH non-condensing.

Temperature Accuracy (at nominal voltage): In 77°F

(25°C) ambient, nominal sensor value: ±2°F.

NOTE: Accuracy can vary based on deviation from nominal

values of input voltage, operating ambient and

sensor ambient.

Sensor: 10k NTC, 400 ft maximum distance between sensor

and electronic controller. See Table 3 for thermistor output.

Approvals:

Underwriters Laboratories, Inc.

Canadian Underwriters Laboratories.

CE.

Accessories:

107048 Heat Conduction Compound, 4 once.

107324A Bulb Holder, duct insertion.

121371A Copper Immersion Well.

121371E Stainless Steel Well.

32004800-001 10K NTC Sensor.

T7047C1090 Wall Mounted Sensor Case.

Voltage (in Vac) Setpoint Range in °F (°C)

24 120/230

-25 to 105

(-32 to 40)

100 to 240

(38 to 116)

T7079A1004 X X

T7079A1012 X X

T7079A1046 X X

T7079A1053 X X

T7079B1028 X X

T7079B1036 X X

T7079B1044 X X

T7079B1051 X X

STAGE1 STAGE2 POWER

2 (50)

2-7/16 (61)

1 (25)

2 (50)

4-1/2

(114)

7-3/16

(183)

2-7/16 (61)

M17560

Voltage Hz Nominal VA Maximum VA

24 50 5.6 6.2

60 5.5 6.1

120 50 7.7 8.5

60 5.6 6.2

230 50 5.0 6.1

60 2.9 4.7

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

363-2572—04

Table 3. 10K thermistor output.

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 product

operation as provided in these instructions.

IMPORTANT

All wiring must agree with applicable codes,

ordinances and regulations.

CAUTION

Electrical Shock or Equipment Damage Hazard.

Can shock individuals or short equipment

circuitry.

Disconnect power supply before installation.

Location and Mounting

Mount the controller on a convenient interior location using the

three mounting holes provided on the back of the enclosure

(mounting screws are not provided and must be obtained

separately). Use controller dimensions in Fig. 1 as a guide.

Sensor Location

The sensor can be located up to 400 feet (122 meters) from

the T7079 using standard AWG 18/2 unshielded wire. The

sensor may be attached to pipes, in an immersion well, in a

wall-mounted case or on a bulb holder.

NOTES:

— For cable runs greater than 25 feet, shielded cable

is recommended.

— Multiple sensors can be parallel-series wired to

sense average temperatures in large spaces.

See Fig. 2.

— To maintain control accuracy, the number of

sensors wired parallel-series must be n2

(examples: 4, 9, 16).

Fig. 2. Parallel-series wiring of sensors.

Sensor Mounting

IMPORTANT

The T7079 is an operation control, not a limit or safety

control. If used in applications requiring safety or limit

controls, use a separate safety or limit control device

in conjunction with the T7079.

Mount the sensor(s) in one of the following manners:

— Hot/cold water sensing: Strap sensor to a pipe or insert in a

well (see Fig. 3).

— Space temperature sensing: Mount on a wall or panel

(see Fig. 4).

— Duct air sensing: Tape to a standard cap or bulb holder.

Fig. 3. Sensor inserted in an immersion well.

Resistance °C °F

97820 -20 -4

32740 0 32

19920 10 50

12500 20 68

10000 25 77

8056 30 86

5326 40 104

3604 50 122

2491 60 140

1756 70 158

1261 80 176

920.9 90 194

TO T7079

SENSORS

M13129

M5249

SENSOR PLACED

IN WELL

IMMERSION

WELL

1/2 NPT

COVER SENSOR

LEADS WITH

HEAT CONDUCTIVE

COMPOUND

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

63-2572—04 4

Fig. 4. Wall-mounted sensor.

WIRING

CAUTION

Electrical Shock or Equipment Damage Hazard.

Can shock individuals or short equipment

circuitry.

Disconnect power supply before installation.

Refer to Fig. 5 for locating the appropriate power input, remote

sensor input and stage output terminals. To access the

terminals, remove the four cover screws and lift off the cover.

Refer to Fig. 6 and 7 for typical wiring.

IMPORTANT

Erratic temperature readings from the sensor can be

caused by poor wiring practices that must be avoided

to ensure proper operation:

1. Do not route the temperature sensor wiring with build-

ing power wiring.

2. Do not locate the temperature sensor wiring next to

control contactors.

3. Do not locate the temperature sensor wiring near

electrical motors.

4. Do not locate the temperature sensor wiring near

welding equipment.

5. Make sure good mechanical connections are made to

both the sensor and the control.

6. Use 90°C copper wire.

Fig. 5. Board layout for T7079.

NOTES:

1. The larger conduit knockout on the enclosure

bottom is for line-voltage applications.

2. The smaller knockout on the enclosure bottom is

for low-voltage applications.

3. The sensor knockout is at the enclosure top.

Fig. 6. Typical low-voltage (24 Vac) wiring application.

M13130

SENSOR

T7047C1090

WALLMOUNT SENSOR

CASE (OPTIONAL)

CAUTION: POSITION SENSOR AWAY

FROM SCREW TERMINALS.

SCREW

TERMINAL

SCREW

TERMINAL

LEADWIRES

TO T7079

LD1

J5 J4 J3

SENSOR J1

DIFF2

DIFF1

INTER

COOL HEAT

LD2

PWR

NC NO NOCOM NC COM COM120V240V

M17561

24 VAC

1 3

TWO-STAGE MODELS ONLY.

LOW-VOLTAGE MODELS ONLY.

LINE-VOLTAGE MODELS ONLY.

STAGE 2 LED POWER LED

STAGE 1 LED

SENSOR

TERMINALS

STAGE DIFFERENTIAL

ADJUSTMENTS

INTERSTAGE

DIFFERENTIAL

OUTPUT STAGE

SWITCHING

VOLTAGE INPUT

J5 J4

SENSOR J1

NC NO NOCOM NC COM

M17562

24 VAC

STAGE 2

LED

STAGE 1

LED

(HOT) L2

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

563-2572—04

Fig. 7. Typical line-voltage (120 Vac) wiring application.

OPERATION

Control Algorithm

On/Off Control

When used in heating mode, the relay is:

— Energized at setpoint minus differential on temperature fall.

— De-energized at setpoint on temperature rise.

When used in cooling mode, the relay is:

— Energized at setpoint plus differential on temperature rise.

— De-energized at setpoint on temperature fall.

NOTE: Each stage LED lights when its stage is energized.

The power LED lights when the controller is

connected to 120/230 or 24 Vac.

Differential (Stage and Interstage)

Adjustment

The stage and interstage differential values are adjusted using

the internal potentiometers (see Fig. 8). Values for setting are

marked on the inside cover:

— Minimum stage differential (DIFF1 or DIFF2): 1°F.

— Interstage differential: 0°F to 35°F.

NOTES:

— Actual minimum differential is typically between

1°F and 4°F. It is influenced by device tolerances

and the rate of temperature change.

— The setpoint knob setting is the stage 1 setpoint.

— The stage 2 setpoint is created using the stage 1

setpoint and the interstage differential:

— When stage 2 is used for heating, the stage 2

setpoint is the stage 1 setpoint minus the inter-

stage differential.

— When stage 2 is used for cooling, the stage 2

setpoint is the stage 1 setpoint plus the inter-

stage differential.

Fig. 8. Adjustments (potentiometers and switches).

TWO-STAGE HEAT

1. Set ST1 and ST2 switches to HEAT.

2. Set interstage (INTER) and differential (DIFF1, DIFF2) to

desired settings.

3. Position the setpoint knob at the setting for stage 1.

TWO-STAGE COOL

1. Set ST1 and ST2 switches to COOL.

2. Set interstage (INTER) and differential (DIFF1, DIFF2) to

desired settings.

3. Position the setpoint knob at the setting for stage 1.

ONE-STAGE HEAT/ONE-STAGE COOL

1. Set ST1 switch to HEAT and ST2 switch to COOL.

2. Set interstage (INTER) and differential (DIFF1, DIFF2) to

desired settings.

3. Position the setpoint knob at the setting for stage 1.

NOTE: See Fig. 9 for an example setup.

Fig. 9. Example one-stage heat/one-stage cool setup.

NOTE: Keep in mind that, based on the terminal board

labels, the stage 1 relay is J4; the stage 2 relay is J5.

J5 J4

SENSOR J1

M17563

STAGE 2

LED

STAGE 1

LED

(HOT) L2

NC NO NOCOM NC COM COM120V240V

DIFF2

ST2

ST1

DIFF1

INTER

COOL HEAT

M17573

ST1: HEAT

ST2: COOL

DIFF1: 2°F

DIFF 2: 4°F

INTER: 6°F

80°F

76°F

70°F

68°F

SETPOINT

KNOB SETTING:

M21062

STAGE 2 DIFFERENTIAL 2

DIFFERENTIAL 1

INTERSTAGE

STAGE 1

COOL ON

COOL OFF

HEAT OFF

HEAT ON

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

63-2572—04 6

CHECKOUT

CAUTION

Compressor Damage Possible.

Rapid cycling can damage compressor and

overload electrical circuits.

When controlling a compressor, allow at least 5

minutes between cycles to equalize internal pressure.

NOTES:

— Checkout will depend on the type of hookup and

controlled equipment.

— Keep in mind that, based on the terminal board

labels, the stage 1 relay is J4; the stage 2 relay is

J5.

With the controller installed and wired, use the following

procedure:

1. Verify all settings.

2. Apply power.

3. Check for proper equipment response.

a. Cooling applications: turn the setpoint knob

counterclockwise until the stage LED lights.

b. Heating applications: turn the setpoint knob

clockwise until the stage LED lights.

NOTE: The stage LED indicates a call for cool/heat.

When it lights, the equipment should respond.

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

763-2572—04

Automation and Control Solutions

Honeywell International Inc. Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North 35 Dynamic Drive

Golden Valley, MN 55422 Toronto, Ontario M1V 4Z9

customer.honeywell.com

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

® U.S. Registered Trademark

63-2572—04 K.K. Rev. 07-09

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