Honeywell T7079A, T7079B Product Data

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T7079A,B
Solid State
Remote Temperature Controllers

PRODUCT DATA

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.

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.

Contents

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

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

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

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

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

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

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

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

63-2572—04

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

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.

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

-25 to 105

24 120/230

(-32 to 40)

T7079A1004 X X

T7079A1012 X X

T7079A1046 X X

T7079A1053 X X

T7079B1028 X X

T7079B1036 X X

T7079B1044 X X

T7079B1051 X X

Dimensions: See Fig. 1.

2 (50)

1 (25)

2-7/16 (61)

2 (50)

2-7/16 (61)

STAGE1 STAGE2 POWER

100 to 240
(38 to 116)

Power Consumption: See Table 2.

Table 2. Power consumption ratings.

Vol tage Hz No m i n a l VA M a x imum 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

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.

4-1/2
(114)

7-3/16

(183)

Accessories:

107048 Heat Conduction Compound, 4 once.
107324A Bulb Holder, duct insertion.

M17560

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

121371A Copper Immersion Well.
121371E Stainless Steel Well.
32004800-001 10K NTC Sensor.
T7047C1090 Wall Mounted Sensor Case.

Electrical Ratings:

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

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

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.

63-2572—04 2

T7079A,B SOLID STATE REMOTE TEMPERATURE CONTROLLERS

CAUTION

Table 3. 10K thermistor output.

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

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.

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 n

2

(examples: 4, 9, 16).

SENSORS

TO T7079

M13129

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.

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.

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.

COVER SENSOR
LEADS WITH
HEAT CONDUCTIVE
COMPOUND

SENSOR PLACED
IN WELL

1/2 NPT

IMMERSION
WELL

M5249

Fig. 3. Sensor inserted in an immersion well.

3 63-2572—04