Honeywell T775B, T775C, T775D User Manual

T775A,B,C,D

Remote Temperature Controller

The T775 family of Electronic Remote Tem­perature Controllers provide on-off temperature
control for ducts, tanks, chillers, heating and re­frigeration units, and other applications where
electronic accuracy in addition to remote sensing
is desired.

In addition, certain models of the T775 family
of controllers provide on-off temperature control
of heating, cooling, and ventilating systems in agri­cultural confinement buildings, storage areas and
heavy industrial applications.

■ T775A models provide staged on-off control with

one temperature input and one to four relay output

stages.

■ T775B models provide staged on-off control with

two temperature inputs and two to four relay output

stages.

■ T775C models provide staged on-off control with

one temperature input and four relay output stages.

■ T775D models provide staged on-off control with

two temperature inputs and four relay output stages.

■ T775C,D models meet National Electrical Code

(Article 547) requirements for animal confinement

buildings.

■ Setpoint temperature range is -40° to +220° F (-40°

to +104°C).

■ Ambient temperature range is -30° to +140°F for

one and two stage models and -30° to +125°F for

three and four stage models.

T775A,B

■ Adjustable temperature range and differential.

■ LCD indication for mode and output status.

■ Keypad provides ease of programming and operation.

■ Accuracy is within +/- 1°F (at nominal operating

ambient temperature of 77°F and voltage input).

■ Stage(s) independently programmed for heating or
cooling.

■ 24/120/240 Vac input voltage.

■ Spdt relay outputs.

IMPORTANT: The T775 is an operating control, not a

limit or safety control. If used in applications requir­ing safety or limit controls, a separate safety or limit
control device should be used in conjunction with the
T775.

T775C,D

■ Linear platinum temperature sensor with T775A,B.

■ Water-tight linear platinum temperature sensor with

T775C,D.

G.R. • 12-94 • ©Honeywell Inc. 1994

CONTENTS

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

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

Installation ..................................................... 5

Description/Operation ................................... 8

Checkout....................................................... 11

1 63-2489

63-2489

T775A,B,C,D
SPECIFICATIONS • ORDERING INFORMATION

Specifications

IMPORTANT: The specifications given in this publication

do not include normal manufacturing tolerances.
Therefore, an individual unit may not exactly match
the listed specifications. Also, this product is tested
and calibrated under closely controlled conditions
and some minor difference in performance can be
expected if those conditions are changed.

MODELS: The T775A,B family of Electronic Temperature

Controllers for ducts, tanks, chillers, heating and refrig­eration units, and other applications where electronic
accuracy is desired in addition to remote sensing.
T775A: Staged on-off control with one temperature input

and one to four relay output stages. Includes one
193987GA Sensor.

T775B: Staged on-off control with two temperature in-

puts and two to four relay output stages. Includes two
193987GA Sensors.

MODELS: The T775C,D family of Electronic Remote Tem-

perature Controllers provides on-off temperature control
of heating, cooling and ventilating systems in agricultural
confinement buildings, storage areas, and heavy indus­trial applications.
T775C: Staged on-off control with one temperature input

and four relay output stages. Mounted in NEMA 4X
enclosure. Includes one 203401B Remote Sensor.

T775D: Staged on-off control with two temperature inputs

and four relay output stages. Mounted in NEMA 4X
enclosure. Includes two 203401B Remote Sensors.

Maximum

Number

Model

Number

T775A1001 1 1 140
T775A1019 1 2 140
T775A1027 1 3 125
T775A1035 1 4 125
T775B1000 2 2 140
T775B1018 2 3 125
T775B1026 2 4 125
T775C1009 1 4 125
T775D1008 2 4 125

ELECTRICAL RATINGS:

Voltage Input: 24/120/240 Vac, 50/60 Hz (+10%/-15%).
Power Consumption:

For one and two stage units:

8 VA maximum at 60 Hz.
10 VA maximum at 50 Hz.

For three and four stage units:

13 VA maximum at 60 Hz.
20 VA maximum at 50 Hz.

Inputs

of

Number
of Relay
Outputs

Operating

Ambient

Temperature (°F)

Ordering Information

When ordering replacement and modernization products from your wholesaler or distributor, refer to the price lists 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 Home and Building Control Sales Office (check the white pages of your phone directory.

2. Home and Building Control Customer Logistics
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386

In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, 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.

63-2489 2

T775A,B,C,D

SPECIFICATIONS

CONTACT RATINGS:

1/2 hp; 9.8 FLA, 58.8 LRA at 120 Vac.
1/2 hp; 4.9 FLA, 29.4 LRA at 240 Vac.
125 VA pilot duty at 120/240 Vac.
10A at 24 Vac (resistive).

SENSOR: Positive coefficient platinum type, 4.8 ohms/ °F,

1000 ft maximum distance between sensor and solid
state controller (requires calibration over 400 ft). To
maintain NEMA 4X rating, use environmental proof
cable and sensor.

TEMPERATURE ACCURACY: +/-1°F (at nominal volt-

age in 77°F [25°C] ambient, nominal sensor value). Accu­racy may vary based on deviation from nominal values of
input voltage, operating ambient and sensor ambient.

DISPLAY RESOLUTION: Sensed temperature and other

operating parameters are displayed via a liquid crystal
display (LCD) with a resolution of 1°F or 1°C.

SETPOINT ADJUSTMENT RANGE: -40° to 220°F (-40°

to 104°C).

OPERATING AMBIENT TEMPERATURE:

One and Two Stage units: -30° to 140°F.
Three and Four Stage units: -30° to 125°F.

OPERATING HUMIDITY: 5% to 95% relative humidity

(RH) noncondensing.

APPROVALS:

Underwriters Laboratories Inc. Listed: File no. E4436.
Canadian Standards Assoc. certified: File no. LR47125.

DIMENSIONS: See Fig. 1 and 2.
MOUNTING: Mounts on any suitable horizontal or vertical

surface (see Fig. 3 and 4 for mounting hole locations).

Fig. 1—Approximate dimensions of T775A,B in
in. (mm).

SET

SELECT

3-13/16 (97)

4-3/4 (121)

ENTER

5-7/32
(134)

7/8 (22) DIAMETER

8-1/2
(216)

2-3/8 (60)

1-1/4
(32)

1-1/4
(32)

M344C

Fig. 2—Approximate dimensions of T775C,D in in. (mm)

6 (153)

5-1/4 (133)

MOUNTING
HOLES

6-1/2
(165)

9

(229)

3-1/2 (89)

1-3/8
(34)

7/8 (22)
DIAMETER

1-1/4
(32)

M1301B

3 63-2489

T775A,B,C,D
SPECIFICATIONS

Fig. 3—Feature locations for T775A,B.

LCD TEMPERATURE
DISPLAY

PROGRAMMING
KEYS

SENSOR INPUT,
TOD, AND 24VAC
TERMINALS

HOLE A

OUTPUT 2

KNOCKOUT B

RELAY OUTPUT STAGES

(MAXIMUM OF FOUR STAGES)

Fig. 4—Feature locations for T775C,D.

SENSOR
A

NC

COM

NO

SELECT

12

3
TOD

NO

COM

NC

OUTPUT 3

C \ F

SET

4

5

24V

6

SENSOR
B

ENTER

8

7

OUTPUT 1

NC
COM
NO

NO
COM
NC

120V
COM
240V

SA SB

°F/°C SELECTION

1

DIP SWITCHES FOR

2

3

SENSOR SELECTION.

4

PRESENT ON T775B
ONLY

MOUNTING HOLE
LOCATION

LINE VOLTAGE
INPUTS

KNOCKOUT C

OUTPUT 4

NOTE: T775A TERMINAL BLOCK CONTAINS ONLY
TERMINALS 1-6 AND HAS NO DIP SWITCHES
FOR SENSOR SELECTION

M7423

LCD TEMPERATURE
DISPLAY

PROGRAMMING
KEYS

SENSOR INPUT,
TOD, AND 24VAC
TERMINALS

HOLE A

EARTH
GROUND
WIRE

HOLE B

RELAY OUTPUT STAGES

SELECT

12

SENSOR

A

OUTPUT 2

NC

COM

NO

NO

COM

NC

OUTPUT 3

3
TOD

SET

C \ F

ENTER

1
2
3
4

°F/°C SELECTION

DIP SWITCHES FOR
SENSOR SELECTION.
PRESENT ON T775D
ONLY

SA SB

6

4

5

8

7

SENSOR

24V

B

MOUNTING
HOLES

OUTPUT 1

120V

NC

COM

COM

240V

NO

NO
COM
NC

OUTPUT 4

NOTE: T775C TERMINAL BLOCK CONTAINS ONLY
TERMINALS 1-6 AND HAS NO DIP SWITCHES
FOR SENSOR SELECTION

LINE VOLTAGE
INPUTS

HOLE C

M7427

63-2489 4

T775A,B,C,D

SPECIFICATIONS • INSTALLATION

ACCESSORIES:

T775A,B:

A775A1003 Temperature Sensor Simulator.
C7100C Duct Mount Averaging Sensor.
198212CA Water Resistant Sensor.
203401B Water Tight Sensor.
T7047C1090 Wall Mounted Sensor Case.
107324A Bulb Holder, duct insertion.
121371A Copper Immersion Well.
121371E Stainless Steel Well.

WHEN INSTALLING THIS PRODUCT…

1. Read these instructions carefully. Failure to fol-

low 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.

WARNING

Disconnect power before installation to prevent
electrical shock or equipment damage.

LOCATION AND MOUNTING

Mount the controller on any convenient interior location
using the two mounting holes provided on the back of the
metal enclosure (mounting screws are not provided and
must be obtained separately). Use controller dimensions in
Fig. 1 (T775A,B) or Fig. 2 (T775C,D) as a guide.

SENSOR LOCATION

The 193987GA Sensor can be located up to 1000 feet
(304 meters) from the T775 using standard AWG 18/2
unshielded wire. For cable runs greater than 25 feet shielded
cable is recommended. See Fig. 5. It may be located on pipes,
in an immersion well, in a wall-mounted case or on a bulb
holder. See Fig. 6. The 193987GA is not a water tight or
water resistant sensor. For wet applications, see the Accesso­ries list in the Specifications section.

Multiple sensors can be parallel-series wired to sense
average temperatures in large spaces.

To maintain control accuracy, the number of sensors
parallel-series wired must be of the n2 power (for example, 4,
9, 16, etc.). See Fig. 7.

107048 Heat Conduction Compound, 4 ounce.
C7043A1098 Case and Immersion Well for running

conduit to sensor.

T775C,D:

121371A Copper Immersion Well.
121371E Stainless Steel Well.
107408 Heat Conduction Compound, 4 ounce.
C7043A1098 Case and Immersion Well for running

conduit to sensor.

Installation

cap or bulb holder for duct air sensing. To prevent moisture
or condensation entering the sensor through the leadwire
holes, mount the sensor with the lead wires exiting the bot­tom of the sensor.

Fig. 5—Using shielded cable for cable runs
longer than 25 feet.

T775

C \ F

1
2
3

4

3
TOD

SET

4

5

24V

SENSOR

ENTER

6

8

7

SENSOR
B

OUTPUT 1

NC
COM
NO

OUTPUT 4

GROUNDING SCREW

NO
COM
NC

120V
COM
240V

SA SB

M7430

GROUND
SHIELD
TO T775
CABLE OR TO
GROUNDING
SCREW

SHIELDED
CABLE

SHIELDED
CABLE

NOTE: DO NOT GROUND
SHIELDED CABLE AT
SENSOR END.

NOTE: TO MINIMIZE NOISE PICKUP, MAKE CONNECTION
FROM SHIELDED CABLE AS CLOSE TO
SENSOR BODY AS POSSIBLE.

SELECT

12

SENSOR
A

OUTPUT 2

NC

COM

NO

NO

COM

NC

OUTPUT 3

NOTE: Use heat conductive compound in immersion wells.

See optional Accessories in the Specifications section.

SENSOR MOUNTING

Sensors can be mounted on a wall or panel for sensing
space temperature (Fig. 6), strapped to a pipe or inserted in a
well (Fig. 8) for hot/cold water sensing, or taped to a standard

CAUTION

Make sure that metal tube of sensor does not short
against T terminals in wall-mounted case.

5 63-2489