Honeywell T775J User Manual

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T775J

63-2248-4

Electronic Remote Temperature Controller

PRODUCT DATA

FEATURES

• T775 model provides reset control with two

GENERAL

The T775J family of electronic remote temperature controllers provides reset control for chillers, heating and cooling systems, and other applications where electronic accuracy in addition to remote sensing is desired.

temperature inputs and one of either 4 to 20 mA, 0 to 18 Vdc, or Electronic Series 90 modulating output with 0 or 1 relay output stages, or 1 or 2 relay output stages with no modulation.

• -40°F to +220°F (-40°C to +105°C) setpoint temperature range.

• -45°F to +225°F (-43°C to +107°C) sensor display range.

• -30°F to + 140°F (-34°C to +60°C) ambient temperature range.

• Linear platinum temperature sensor.

• Adjustable temperature range and differential.

• Adjustable throttling range of 2° to 30° F or C.

• Adjustable reset ratio.

• Liquid crystal display (LCD) indication for mode and

output status.

• Keypad provides ease of programming and operation.

• Accuracy is within +/- 1°F/C at nominal input voltage, nominal sensor ambient temperature (77°F (25°C) operating ambient). Accuracy can vary as parameters deviate from nominal.

• Stages independently programmed for heating or cooling.

• 24/120/240 Vac voltage inputs.

• Spdt relay outputs.

IMPORTANT

The T775 is an operating control, not a limit or safety control. When used in applications requiring safety or limit controls, use a separate safety or limit control device in conjunction with the T775.

The Electronic Series 90 output provided with T775J models will not drive electromechanical Series 90 slidewire devices.

Proportional + Integral

Contents

General ............................................................................... 1

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

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

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

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

Description/Operation ......................................................... 13

Checkout ............................................................................. 18

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

SPECIFICATIONS

IMPORTANT

Models (See Table 1):

The T775J family of electronic remote temperature controls provides reset control for chillers, heating and cooling systems, and other applications where electronic accuracy in addition to remote sensing is desired.

T775J provides reset control with one of either 4 to 20 mA, Electronic Series 90, or 0 to 18 Vdc Proportional + Integral modulating output with 0 or 1 relay output stages, or 1 to 2 relay output stages with no modulation. Includes two part number 193987GA Sensors.

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 differences in performance can be expected if those conditions are changed.

two

temperature inputs and

Table 1. T775J Model Numbers and Outputs.

Outputs

Model

Number

T775J1001 None 1 T775J1019 Series 90 0 T775J1027 4-20 mA 0 T775J1035 0-18 Vdc 0 T775J1043 Series 90 1 T775J1050 4-20 mA 1 T775J1068 0-18 Vdc 1 T775J1076 None 2

Modulation

Type

Number of Relay

Outputs

Electrical Ratings:

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

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

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).

Temperature Accuracy:

±1° F (0.6° C) (at nominal input voltage, 77°F (25°C) operating ambient, nominal sensor ambient).

Setpoint Adjustment Range:

-40° F to +220° F (-40° C to +105° C).

Operating Ambient Temperature:

Controller: -30°F to + 140°F (-34°C to 60°C). Sensor: -45°F to + 225°F (-43°C to 107°C).

Throttling Range for Modulating Output:

Adjustable 2° to 30° F or C.

Differential Range for Staged Output:

Adjustable 1° to 30° F.

Reset Ratio:

Adjustable between 1 to 30 and 30 to 1.

Operating Humidity:

5 to 95 percent relative humidity, noncondensing.

Sensor:

Positive coefficient platinum type, 4.8 ohms/°F, 1000 feet maximum distance between sensor and solid state controller (requires calibration over 400 feet).

Approvals:

Underwriters Laboratories Inc. Listed: File No. E4436.

Guide XAPX.

Canadian Standards Association Certified: File No.

LR47125.

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 .

1. Model Number

2. Accessory

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 Home and Building Control Sales Office (check 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.

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

Mounting:

Mounts on any suitable horizontal or vertical surface. (See Fig. 5 for mounting hole locations.)

Dimensions:

See Fig. 1.

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.

Accessories:

C7100C1003 Duct Mount Averaging Sensor*. T7047C1090 Wall Mount Sensor Case. 107324A Bulb Holder, duct insertion. 121371A Copper Immersion Well. 121371E Stainless Steel Immersion Well. 107408 Heat Conduction Compound, 4 ounce. C7043A1098 Case and Immersion Well. 203401B Waterproof Sensor. 203531A Panel Mounting Kit. A775A1003 Sensor Simulator. *Use of C7100C1003 decreases accuracy of T775 to ±2°F

(±1°C).

CAUTION

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

Location and Mounting

Mount the controller in any convenient interior location using the two mounting holes provided. Mounting screws are not included. Use controller dimensions in Fig. 1 as a guide.

Sensor Location

The 193987GA Sensor can be used up to 1000 ft (304m) from the T775 using standard AWG 18/2 unshielded wire. If longer than 25 feet in an electrically noisy environment, use shielded cable. Locate the sensor on pipes, in immersion wells, in wall-mounted cases or on a bulb holder.

Multiple sensors can be parallel-series wired to sense average temperature in large spaces. In order to maintain control accuracy, be sure the number of sensors parallelseries wired is of the n2 power (i.e., 1, 4, 9, 16, etc). See Fig. 2.

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)

M344C

Fig. 1. Approximate T775J dimensions in in. (mm).

INSTALLATION

When Installing this Product...

쐃 Read these instructions carefully. Failure to follow them

could damage the product or cause a hazardous condition.

쐇 Check the ratings given in these instructions and on the

product to make sure the product is suitable for your application.

쐋 Installer must be a trained, experienced service

technician.

쐏 After installation is complete, check out the product

operation as provided in these instructions.

SENSORS

TO T775 CONNECTIONS 1 AND 2 (SENSOR A) OR 7 AND 8 (SENSOR B).

M7431

Fig. 2. Parallel-series wiring of sensors.

Sensor Mounting

Mount the sensor on a wall or panel for sensing space temperature (Fig. 3); strap it to a pipe, or insert it into a well (Fig. 4) for hot/cold water sensing; or tape it to a standard cap or bulb holder for duct air sensing. To prevent moisture or condensation entering the sensor through the leadwire holes, mount the sensor with leadwires exiting the bottom of the sensor.

NOTE: Use heat conductive compound in immersion wells.

See Accessories.

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

Mounting Sensor in T7047C1090 Case

쐃 Run wires from T775J through wall. 쐇 Mount case to wall with screws provided. 쐋 Connect wires from the T775J to two T terminals on the

T7047C Case.

 Cut and strip 193987GA Sensor leads to 3 to 4 inch (76

to 102 mm) length and connect to T terminals in the case.

 Position sensor as shown in Fig. 3; assemble cover and

tighten cover screws.

CAUTION

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

2. Do not run sensor wiring (even if using shielded cable) with building power wiring.

T7047C1090 WALLMOUNT SENSOR CASE (OPTIONAL)

LEADWIRES TO T775

SCREW TERMINAL

193987GA SENSOR

Wiring

CAUTION

Disconnect external power before wiring to prevent electrical shock or equipment damage.

IMPORTANT

The T775J is not intended for safety limit applications. It is an operating control, not a safety control.

Disconnect external power before wiring to prevent electrical shock or equipment damage. All wiring must comply with applicable local codes and ordinances.

Refer to Fig. 4 for locating the appropriate power inputs, remote sensor inputs, relay, modulating output terminals, contact closure input, and sensor selection switch. Access the terminals through standard conduit knockouts (A-C) located around the enclosure perimeter.

NOTE: Hole A should only be used for remote sensor

wiring, low voltage wiring, and access to modulating output.

When wiring the input power, only one source of power can be applied to the T775J (e.g., 24 or 120 or 240 Vac). Knockouts B and C can be used to gain access to 120 or 240 Vac input terminals and the load relay output terminals.

CAUTION: POSITION SENSOR AWAY FROM SCREW TERMINALS.

Fig. 3. Sensor mounted on wall.

COVER SENSOR LEADS WITH HEAT CONDUCTIVE COMPOUND

SENSOR PLACED IN WELL

1/2 NPT

Fig. 4. Sensor inserted in immersion well.

M8109C

IMMERSION WELL

M5249

The T775J can be used to provide reset control of damper and valve actuators that accept 4 to 20 mA, 0 to 18 Vdc or Electronic Series 90 modulating inputs, and to control one onoff load. Depending on the application and the motor or actuator used, the T775J can control up to three Modutrol motors by using resistor kits that are available as accessories for existing motors. Use specified resistor kits to control an Electronic Series 90 (Modutrol®) Motor with a 4 to 20 mA controller. Obtain information on these kits from either the TRADELINE® catalog, motor specification or your local distributors. See Fig. 7 through 15 for typical T775J wiring and applications.

63-2248—4

LCD TEMPERATURE DISPLAY

PROGRAMMING KEYS

SENSOR INPUT, TOD, AND 24V TERMINALS

KNOCKOUT "A"

MODULATING OUTPUT ELECTRONIC SERIES 90, 4-20 mA OR 0-18 VDC DEPENDING ON MODEL

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

C/F

C / OF SELECTION

RESET DIP SWITCHES

MOUNTING HOLE LOCATION

LINE VOLTAGE INPUTS

SELECT

SA TOD 24V SB

SET

45678

ENTER

SA SB

COM

240V

120V

12 3

IMPORTANT

Erratic temperature readings from the 193987GA Sensor can be caused by poor wiring practices that must be avoided to assure proper operation:

a. Do not route temperature sensor wiring with

b. Do not locate temperature sensor wiring next to

c. Do not locate temperature sensor wiring near

d. Do not locate temperature sensor wiring near

e. Make sure good mechanical connections are

f. Do not mount sensor with leadwire end (wire end)

g. Use shielded wiring to connect the sensor to the

OUTPUT 1

KNOCKOUT "B"

RELAY OUTPUT STAGES

NO COM NC

Fig. 5. Feature locations.

building power wiring.

control contactors.

electric motors.

welding equipment.

made to both the sensor and the controller.

pointing up in an area where condensation can occur.

T775 when an electrically noisy environment exists. See Fig. 6.

OUTPUT 2

NO COM NC

GROUND SHIELD TO T775 CASE OR TO GROUNDING SCREW

SHIELDED CABLE

SELECT

SA TOD 24V SB

KNOCKOUT "C"

M8118

T775

SET

45678

ENTER

C/F

SA SB

COM

240V

120V

12 3

OUTPUT 1

SHIELDED CABLE

NOTE: DO NOT GROUND SHIELDED CABLE AT SENSOR END.

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

NO COM NC

Fig. 6. Using shielded cable for cable

runs longer than 25 feet.

OUTPUT 2

NO COM NC

GROUNDING SCREW

SENSOR

M4718

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

C/F

1 2 3

SA SB

COM

240V

SENSOR A

SENSOR B

120V

M8111

SENSOR A

24 VAC

SENSOR B

LOAD 1 LOAD 2

SELECT

1 SA TOD 24V SB

OUTPUT 1

NO COM NC

SET

45678

ENTER

OUTPUT 2

NO COMNC

LOAD 1

SELECT

SA TOD 24V SB

OUTPUT 1

NO COM NC

SET

45678

LOAD 2

ENTER

OUTPUT 2

NO COMNC

C/F

SA SB

COM

240V

120V

1 2 3 4

BLK

240 VAC

RED

M8113

Fig. 7. Reset control with 24 Vac input,

24 Vac loads.

SET

ENTER

OUTPUT 2

NO COMNC

LOAD 2

SENSOR A

SENSOR B

LOAD 1

SELECT

SA TOD 24V SB

OUTPUT 1

NO COM NC

45678

C/F

SA SB

COM

240V

120V

1 2 3 4

BLK

120 VAC

WHT

M8112

Fig. 9. Reset control with 240 Vac input, 240 Vac loads.

C/F

12 3

SA SB

COM

240V

120V

BLK

120 VAC

WHT

24 VAC

M8114

SENSOR A

SENSOR B

SELECT

SA TOD 24V SB

OUTPUT 1

NO COM NC

LOAD 1

SET

45678

LOAD 2

ENTER

OUTPUT 2

NO COMNC

Fig 8. Reset control with 120 Vac input, 120 Vac loads.

63-2248—4

Fig. 10. Reset control with 120 Vac input, 24 Vac loads.

ELECTRONIC SERIES 90 MODUTROL MOTOR

T1 T2

BRW

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

C/F

1 2 3

SELECT

SET

ENTER

SA SB

POWER INPUT

SENSOR A

24 VAC

SENSOR B

LOAD 1

1 SA TOD 24V SB

BRW

45678

OUTPUT 2

NO COMNC

T775J

USE SEPARATE TRANSFORMER FOR T775 WHEN POWERING FROM 24 VOLTS.

T775J1019, T775J1043 PROVIDE ELECTRONIC SERIES 90 OUTPUT THAT

NOTE:

WILL NOT DRIVE 135 OHM SLIDEWIRE DEVICES.

PROPER OUTPUT LEVELS CAN BE CHECKED BY MEASURING THE OPEN CIRCUIT VOLTAGE BETWEEN TERMINALS 1 (W) AND 2 (R): MINIMUM (DRIVE CLOSED): ≤ 0.17 VDC MAXIMUM (DRIVE OPEN): ≥ 1.7 VDC

Fig. 11. Reset control with 24 Vac input, Series 90 and 24 Vac loads.

4-20mA MODULATING MOTOR OR ACTUATOR

240V

120V

COM

M8115A

C/F

SA SB

COM

240V

120V

3 4

T1 T2

POWER INPUT

SENSOR A

SENSOR B

SELECT

45678

SA TOD 24V SB

SET

ENTER

OUTPUT 2

NO COMNC

LOAD 1

Fig. 12. Reset control with 120 Vac input, 4 to 20 mA and 120 Vac loads.

BLK

120 VAC

WHT

M8116

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

MODULATING MOTOR WITH VOLTAGE CONTROL INPUT

T1 T2 CRF

SELECT

SET

ENTER

C/F

SA SB

12 3

POWER INPUT

SENSOR A

SENSOR B

1 SA TOD 24V SB

45678

OUTPUT 2

NO COMNC

240V

COM

120V

LOAD 1

Fig. 13. Reset control with 240 Vac input, 240 Vac and 0 to 18 Vdc loads.

M954 OR M955 MODUTROL® MOTOR

SELECT

DIP SWITCHES FOR SENSOR TO LOAD SELECTION.

SET

ENTER

C/F

SA SB

12 3

BLK

RED

M8117

240 VAC

L1 (HOT)

63-2248—4

M954 OR M955 MODUTROL® MOTOR

SA TOD 24V SB

45678

BRW

M954 OR M955 MODUTROL® MOTOR

OUTPUT 1

NO COM NC

OUTPUT 2

NO COM NC

240V

COM

120V

NOTE: USE SEPARATE TRANSFORMER FOR T775 WHEN POWERING FROM 24 VAC.

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

2 USE 1300 OHM RESISTOR FOR 2 MOTORS, 910 OHMS RESISTOR FOR 3 MOTORS. 4047EAU RESISTOR KIT (SHIPPED WITH M954, M955 MOTORS) INCLUDES 1300 OHM AND 910 OHM RESISTORS.

Fig. 14. Reset control with Series 90 Modutrol® Motor.

M4717

ML984 ACTUATOR

T1 T2

BRW

250 OHM

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

DIP SWITCHES FOR SENSOR TO LOAD SELECTION.

C/F

12 3

SELECT

SA TOD 24V SB

SET

45678

ENTER

SA SB

POWER INPUT

1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

Fig. 15. Reset control with ML984 Valve Actuator.

Use shielded cable if any of the above conditions cannot be avoided.

Device Setup

쐃 Determine the loads to be controlled and the operating

mode (heat or cool) and enter on the worksheet.

For example: Load 1: Compressor 1 (cool)

Setpt 1 _____ On at _____ Diff 1 _____ Off at _____

쐇 Determine the setpoint (Setpt) and the switching

differential (Diff) temperatures for each on/off load and enter on the worksheet.

For example: Load 1: Compressor 1 (cool)

Setpt 1 Diff 1

쐋 Refer to the Control Algorithm section to calculate the

load on and off temperatures and enter on the worksheet. Remember that on/off outputs are off at setpoint in both the heating and cooling operating modes. When in cooling mode, the load will be turned on at setpoint plus the differential. When in heating mode, the load will be turned on at setpoint minus the differential.

78°F On at 82°F

4°F Off at 78°F

BRW

120V

COM

240V

OUTPUT 1

NO COM NC

OUTPUT 2

NO COM NC

M4716

CAUTION

The T775J will not allow the user to program for both heating and cooling loads to be energized at the same time.

If this situation results, cooling loads will be energized and heating loads will be prevented from also energizing. The number (1,2) of these nonenergized loads will flash, along with the word HEAT, to indicate a call for both heating and cooling loads controlled by one sensor has occurred and to alert the user to reprogram the affected control values.

쐏 To calculate the Reset Ratio to be used, determine the

number of degrees the setpoint for the control sensor A should be reset (Reset Ratio A Value) to compensate for a change in the reset compensation sensor B (Reset Ratio B Value). Enter the values on the Device Programming Worksheet (values should be whole numbers from 1 to 30).

CAUTION

A reset ratio lower than one can result in unstable control. Widening the throttling range and/or differential will minimize this effect.

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

쐄 Determine the desired Reset Direction (up or down)

and enter on the Device Programming Worksheet. This will determine if the setpoint for the control Sensor A will be reset up or down.

쐂 Determine the desired Reset Compensation Setpoint

for Sensor B. Enter the value on the Device Programming Worksheet.

쐆 Determine whether the desired Reset Action should

occur

above

or below the Reset Compensation Setpoint. Enter abo Programming Worksheet.

쐊 Remove the T775J cover and enter the values listed on

the worksheet and the date in the first column on the label inside the T775J cover.

Device Programming Worksheet

Load 1: Setpt 1 ___________ On at __________ Diff 1 or Throttling Range __ Off at __________

Load 2: Setpt 2 ___________ On at __________ Diff 2 ____________ Off at __________

Reset Ratio: Reset Ratio B Value ______ Reset Ratio A Value ______

Reset Direction __________________________ Compensation Setpoint Sensor B ____________ ResetAction _____________________________

below

on the Device

Device Programming

Factory Default Values

When power is initially applied to the T775J, the control points will be at the factory set default values. Default values are:

Differential/

Stage Setpoint

Stage 1 72°F 2°F Heat Stage 2 70°F 2°F Heat

쐃 Set the reset direction determined previously by setting

the DIP switch in the upper right corner of the T775 (see Fig. 5). Switch 1 should be open to reset the control point

down

쐇 Set the reset action determined previously by setting

쐋 Before programming the T775J, verify that the °F/°C

쐏 Apply power to the device. The device will begin

the DIP switch in the upper right corner of the T775J. Switch 2 should be the outdoor temperature is compensation setpoint and occur when the outdoor air temperature is reset compensation setpoint.

selection jumper is properly installed. The T775J is shipped from the factory with the jumper installed in the °F position. If °C is desired, remove the jumper.

counting down from 210. This countdown sequence will last for approximate 3-1/2 minutes.

Throttling Range

and

closed

open

to reset the control point

if the reset is to occur when

below

the reset

closed

if the reset is to

Operating

Mode

above

the

쐄 To avoid this time delay, press Select. 쐂 Press Select and Enter keys simultaneously to begin

programming the load operating mode (heat or cool). The display will indicate heat or cool and the stage number.

쐆 Press Set (down arrow) to change to cooling. Set (up

arrow) will change back to heating.

쐊 Press Enter to program the displayed mode into

memory.

쐎 Press Select to go to the next step. 쐅 Repeat steps 6 through 8 for additional changes.

Programming Stage Control Values

쐃 If you have a 0 to 18 Vdc output T775J, go to the

Calibration Procedure for 0 to 18 Vdc Output T775 before continuing to program the stage control values. The Series 90 and 4-20 mA output T775J Controller does not require calibration, so proceed to step 2.

IMPORTANT

When programming all stages ,it is important to note that the first stage designated on the LCD display is always the modulating output.

쐇 Press Select to display the current stage setpoint. 쐋 Press Set (up arrow) to increase or Set (down arrow) to

decrease the display to the desired setpoint.

쐏 Press Enter to enter the displayed value into memory. 쐄 Press Select to display the current stage throttling

range or switching differential.

쐂 Press Set (up arrow) to increase or Set (down arrow) to

decrease the display to the desired throttling range or switching differential.

쐆 Press Enter to enter the displayed value into memory. 쐊 Repeat steps 2 through 7 to program each additional

stage.

IMPORTANT

After initial programming, altering the setpoint up or down for stage 1 will result in a change in setpoint 2 by the same number of degrees and in the same direction. If increasing or decreasing the setpoint for stage 1 results in exceeding the control limits (-40 to +220

F) for stage 2, the control will not allow the user to enter a value for stage 1 higher or lower than this limit. This will allow for easy sequential output staging to be modified while keeping the margin intact between setpoints.

Programming Reset Values

쐃 Press Select to display the current reset compensation

setpoint (Sensor B).

쐇 Press Set (up arrow) to increase or Set (down arrow) to

decrease the display to the desired setpoint.

쐋 Press Enter to enter the displayed value into memory. 쐏 Press Select to display the current Reset Ratio B

value.

쐄 Press Set (up arrow) to increase or Set (down arrow) to

decrease the display to the desired Reset Ratio B value.

쐂 Press Enter to enter the displayed value into memory. 쐆 Press Select to display the current Reset Ratio A. 쐊 Press Set (up arrow) to increase or Set (down arrow) to

decrease the display to the desired Reset Ratio A value.

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

쐎 Press Enter to enter the displayed value into memory. 쐅 Press Select four times to return to stage 1 parameters.

Scroll through the programming loop a second time to confirm that the appropriate values have been entered into memory.

NOTE: The T775J has three options for displaying the

sensed temperatures:

1. Sensor A only.

2. Sensor B only.

3. Alternating between Sensor A and Sensor B.

쐈 Press Select after viewing the switching differential for

the final stage to display Sensor A temperature only.

쐉 Press Select again to display Sensor B temperature

only.

씈 Press Select again to alternate the display between

Sensor A temperature and Sensor B temperature at approximately five second intervals.

씉 Before replacing the cover on the T775J, check to see

that the control values have been recorded on the label on the back of the cover.

NOTE: The control values programmed into memory will not

be lost because of a power failure.

Calibration Procedure for 0 to 18 Vdc Output T775J

NOTE: The 0-18 Vdc Output T775J models have field

selectable starting voltages and spans and will require calibration. The Series 90 and 4-20 mA output devices require no calibration.

쐃 Disconnect power to the device. 쐇 Remove the device cover and disconnect the load from

the plus and minus outputs. Connect a dc voltmeter to the plus and minus modulating outputs of the T775J (see Fig. 12).

쐋 Loosen the screw in the upper right corner of the T775J

approximately six turns with a screwdriver (see Fig. 12).

쐏 Rotate the display printed wiring board outward from

the device until it is approximately perpendicular to the enclosure (see Fig. 12).

쐄 The T775 is factory set to a span of 8 Vdc. To select a

different span (3 Vdc, 14 Vdc, or 17 Vdc), change the switch positions on the voltage selection switch by opening the switch for 8 Vdc and closing the switch for the chosen span (see Fig. 12).

쐂 Apply power to the device. 쐆 Press Select until Sensor A temperature is displayed. 쐊 Record the sensed temperature. 쐎 Determine the operating mode for stage 1 (Heat or

Cool). Choose the appropriate example to follow. Calculate the setpoints to be used for calibrating the device in column B, following the example in column A.

Calibration Setpoint for Cooling Mode (Fig. 13)

Setpoint for calibrating the lower voltage level (closed position):

Calibration Setpoint for Heating Mode:

Calibrate the Lower Voltage Level (Closed Position).

쐃 Read displayed temperature of sensor that is controlling

쐇 Press Select until the setpoint for stage 1 is displayed. 쐋 If stage 1 is in the HEAT mode, press Set (down arrow)

쐏 If stage 1 is in the COOL mode, press Set (up arrow)

쐄 Press Enter to enter this value into memory. 쐂 Press Select once so that the throttling range is

쐆 Press Set (up arrow) or Set (down arrow) until the

쐊 Press Enter to enter this value into memory. 쐎 Connect voltmeter as shown in Fig. 8. 쐅 Press Select until Sensor A is displayed (if the sensed

쐈 Turn the zeroing voltage potentiometer with a

쐉 Confirm upper voltage level:

씈 Rotate the display printed wiring board back into the

씉 Disconnect the voltmeter from the modulating outputs

씊 Return to Programming Stage Control Values to enter

Sensed Temperature 78°

Add 3° F or C to above: +3° Calibration Setpoint: 81°

AB Sensed Temperature: 78° Subtract 3° F or C from above: -3° Calibration Setpoint 75°

stage 1.

until the setpoint is at least three degrees below the temperature in step 1.

until the setpoint is at least three degrees above the temperature in step 1.

displayed.

throttling range is two degrees.

temperature has drifted from step 1, you may need to repeat steps 2 through 8).

screwdriver until the desired lower voltage (i.e., 2V, 6V, etc) is displayed on the voltmeter.

• Record the sensed temperature for sensor

controlling stage 1.

• Press Select until stage 1 setpoint is displayed.

• If stage 1 is in the HEAT mode, press Set (up

arrow) until setpoint is at least three degrees above the sensed temperature.

• If stage 1 is in the COOL mode, press Set (down

arrow) until setpoint is at least three degrees below the sensed temperature.

• Press Enter to enter this value into memory.

• Record the (desired) upper voltage level.

• If the value is not correct, make sure the correct

span switch is depressed and the stage is in the correct mode of operation (HEAT or COOL). Verify which sensor is controlling stage 1.

device and tighten the screw in the upper right corner.

and connect the load to the plus and minus terminals of the modulating terminal block.

the desired stage control values.

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

STEP 1

SET

SELECT

45678

24V SB

TOD

OUTPUT 1

NO COM NC

REMOVE FRONT COVER AND LOOSEN SCREW IN UPPER RIGHT CORNER OF DEVICE WITH A SCREWDRIVER.

ENTER

OUTPUT 2

NOCOM NC

SA SB

240V

COM

120V

ZEROING VOLTAGE DIAL

3 4

MODULATING VOLTAGE OUTPUT

SENSOR INPUT, TOD, AND 24 VAC TERMINALS

123

OUTPUT 1

NO COM NC

GENTLY PULL THE TOP PWB UPWARDS AROUND ITS HINGE. STOP WHEN THE PWB IS PERPENDICULAR TO THE ENCLOSURE.

STEP 2

OUTPUT 2

NOCOM NC

240V

123

OPEN

COM

120V

VOLTAGE SPAN SELECTION SWITCH

STEP 3

123

OPEN

120V

COM

240V

OUTPUT 1

NO COM NC

CONNECT THE MODULATING VOLTAGE OUTPUT TO A VOLTMETER. USING A SCREWDRIVER, ADJUST THE LOWER LIMIT OF THE VOLTAGE TO THE DESIRED LEVEL ACCORDING TO THE STEPS OUTLINED IN CLAIBRATION PROCEDURE FOR 0 TO18 VDC OUTPUT.

OUTPUT 2

NOCOM NC

CLOSED

OPEN

WHEN SWITCH IS DEPRESSED, THE

VOLTAGE RANGE IDENTIFIED BY THE VOLTAGE SPAN BELOW THAT SWITCH IS SELECTED. IN THIS CASE, A VOLTAGE SPAN ON 8 VDC HAS BEEN SELECTED. THIS SPAN CAN BE 2-10 VDC, 10-18 VDC, ETC., BY USE OF ZEROING DIAL.

VOLTMETER

1234

OPE

381417

VOLTAGE SPANS

M1345B

63-2248—4

Fig. 16. Voltage span selection.

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

HEATING MODE

MODULATION

SENSED TEMPERATURE = 78

CALIBRATION SETPOINT 75oF

CALIBRATION SETPOINT 81

SENSED TEMPERATURE = 78

MODULATION

* DEADBAND IS 1/8 OF THE THROTTLING RANGE

COOLING MODE

MODULATION

DEAD BAND

THROTTLING RANGE

* DEADBAND IS 1/8 OF THE THROTTLING RANGE

Fig. 17. Explanation of calibration setpoints for heating and cooling modes.

DESCRIPTION/OPERATION

Control Algorithm

Reset Control

The T775J operates as a reset controller with two sensor inputs. The outdoor sensor is designated Sensor B and the control medium sensor is Sensor A. Sensor B is wired to pins 7 and 8 of the input terminal block, while Sensor A is wired to pins 1 and 2. The T775J is capable of providing modulating or relay outputs for reset control. Each stage of the T775J has its own independent setpoint that can be configured to operate in the cooling or heating mode. The mode of operation for each stage is user determined by the programming keys.

For reset control with two outputs, one of which is modulating,

M2149C

the modulating output will be designated as stage 1 on the LCD display. Although the modulating output is designated as stage 1, it can be programmed to energize after the second stage is energized.

The T775J offers four different reset configurations and an adjustable reset ratio between 30 to 1 and 1 to 30.

The reset ratio expresses the amount of change in the heating or cooling medium control point caused by a change in the outdoor temperature. It is the ratio of outdoor temperature change to heating or cooling control point change (Sensor B/Sensor A). The reset ratio can be an inverse ratio (when the outdoor temperature goes down, the control point goes up) or a direct ratio (when the outdoor

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

temperature goes down, the control point goes down). The type of ratio is selected by using the two DIP switches provided.

The four possible reset operating configurations are illustrated and explained in Fig. 18. Switches 1 and 2 are shown but switches 3 and 4 are unused; however, the location of these DIP switches is shown in Fig. 5.

CAUTION

A reset ratio lower than one can result in unstable control. Widening the throttling range and/or differential minimizes this effect.

Proportional + Integral Modulating Control

Proportional + Integral (P+I) control provides fast, responsive operation of the controlled devices in reacting to temperature changes by providing an output signal proportional to the deviation between setpoint and actual temperature. An integral proportion also provides a time dependent output signal that is dependent on the length of time of the deviation between actual set point and sensed temperature.

The P + I algorithm places the control setpoint in the middle of the throttling range. A deadband around setpoint exists and is proportional to the throttling range. For the T775, this deadband is 1/8 of the throttling range.

There are three modulation options available for the T775J (see Fig. 20 for modulating output connecting terminals).

Fig. 18. Reset switch configuration.

OPEN

SWITCH

OPEN

PWB

CLOSED

OPEN

RESET DIRECTION SWITCH RESET DIRECTION SWITCH: WILL RESET

THE COUNTROL POINT UP (WHEN OPEN) OR DOWN (WHEN CLOSED).

RESET ACTION SWITCH RESET ACTION SWITCH: RESET IF THE

OUTDOOR TEMPERATURE (SENSOR B) IS ABOVE (WHEN CLOSED) OR BELOW (WHEN OPEN) THE OUTDOOR TEMPERATURE SETPOINT.

SWITCH

CLOSED

SIDEVIEW

RESET DIRECTION SWITCH OPEN

IF THE OUTSIDE SENSOR (B) TEMPERATURE IS BELOW THE OUTSIDE TEMPERATURE SETPOINT,THE CONTROL POINT WILL BE INCREASED BY THE RESET RATIO.

RESET ACTION SWITCH OPEN

RESET DIRECTION SWITCH CLOSED IF THE OUTSIDE SENSOR (B)

TEMPERATURE IS BELOW THE OUTSIDE TEMPERATURE SETPOINT,THE CONTROL POINT WILL BE DECREASED BY THE RESET RATIO.

RESET ACTION SWITCH OPEN

RESET DIRECTION SWITCH OPEN IF THE OUTSIDE SENSOR (B)

TEMPERATURE IS ABOVE THE OUTSIDE TEMPERATURE SETPOINT,THE CONTROL POINT WILL BE INCREASED BY THE RESET RATIO.

RESET ACTION SWITCH CLOSED

PWB

63-2248—4

RESET DIRECTION SWITCH CLOSED IF THE OUTSIDE SENSOR (B)

TEMPERATURE IS ABOVE THE OUTSIDE TEMPERATURE SETPOINT,THE CONTROL POINT WILL BE DECREASED BY THE RESET RATIO.

RESET ACTION SWITCH CLOSED

OPEN

CLOSED

Fig. 19. Summary of action/direction switches.

M8110A

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

SETPOINT "B" (OUTSIDE TEMPERATURE)

RESET DIRECTION SWITCH

RESET ACTION SWITCH

OPEN

RESETS CONTROL SETPOINT A UP WHEN SENSOR B (OUTSIDE TEMPERATURE) IS BELOW SETPOINT.

UPDOWN

RESETS CONTROL SETPOINT A DOWN WHEN SENSOR B (OUTSIDE TEMPERATURE) IS BELOW SETPOINT.

RESET DIRECTION SWITCH

RESET ACTION SWITCH

A C

OPEN

12 3 4

BELOW ABOVE

B D

12 3 4

B D

RESET DIRECTION

OPEN

RESETS CONTROL SETPOINT A UP WHEN SENSOR B (OUTSIDE TEMPERATURE) IS ABOVE SETPOINT.

RESETS CONTROL SETPOINT A DOWN WHEN SENSOR B (OUTSIDE TEMPERATURE) IS ABOVE SETPOINT.

OPEN

12 3 4

SWITCH

RESET ACTION

SWITCH

RESET DIRECTION SWITCH

RESET ACTION

SWITCH

A. SWITCH 1 CONTROLS THE RESET DIRECTION. LEFT RESETS SENSOR A CONTROL POINT (BOILER OR CHILLER WATER TEMPERATURE UP; RIGHT RESETS IT DOWN.

B. SWITCH 2 CONTROLS THE RESET ACTION. LEFT RESETS AS SENSOR B (OUTDOOR TEMPERATURE) DROPS BELOW SETPOINT B; RIGHT RESETS AS IT RISES ABOVE IT.

C. SWITCHES 3 AND 4 ARE NOT USED.

M4719

• 4-20 mA: This is a general purpose current mode output that can drive a 600 ohm maximum load without output current

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

degradation. This modulation output can be used with Honeywell Inc Modutrol IV signal of 4-20 mA or other Honeywell Inc motors with the use of resistor kits.

• 0-18 Vdc (voltage ranging): This output mode is intended as a general purpose voltage output capable of driving a 2 kohm load minimum. The span of voltage output is user selectable via a DIP switch (see Fig. 14). The spans offered are 3, 8, 14 and 17 volts. A zero adjustment dial is provided to allow the user to select common ranges such as 4-7 Vdc, 6-9 Vdc, 2-10 Vdc, 10.5 -13.5 Vdc, 14.5-17.5 Vdc, 1-15 Vdc, and 1-18 Vdc. This modulation output can be used with Modutrol IV™ Motors that accept a voltage span comparable to any of the above. The device is factory set at the 2 to 10 Vdc span.

Motors that accept an input

Heat Operation Mode

• Throttling range is centered around the setpoint.

• Modulating outputs are at the minimum or closed position at setpoint plus one-half of the throttling range.

• Modulating outputs are at the maximum or open position at setpoint minus one-half of the throttling range.

• Relay outputs are energized at setpoint minus differential and de-energized at setpoint.

Cooling Operation Mode

• The throttling range is centered around the setpoint.

• Modulating outputs are at the minimum or closed position at setpoint minus one-half of the throttling range.

• Modulating outputs are at the maximum or open position at setpoint plus one-half of the throttling range.

• Relay outputs are energized at setpoint plus differential and de-energized at setpoint.

Contact Closure Override Input

A two terminal input is provided to allow the user to override a relay energized condition of all outputs. When used with modulating devices, a contact closure override input causes the output to return to its minimum position. This function is generated by a contact closure between terminal pins 3 and 4 of the terminal block for sensor input shown in Fig. 4. This can be achieved manually or by using an EMS controller or time clock with normally open contacts; i.e., W7505, S7005.

When contact closure override is active, the display will show the number of stages that would have been energized and “STAGE ENERGIZED’’ will flash.

°F/°

C Selection

A single jumper plug controls °F/°C indication of the displayed temperature value. The location of this jumper is shown in Fig.

5. The unit is shipped with the jumper installed in the °F

mode. Remove the jumper plug for the °C mode. Remove and reapply power if the jumper is removed with the device powered.

DIP Switch Selections

DIP switches, see Fig. 18, are provided for assignment of the reset configurations.

A second set of DIP switches provides voltage range selection for 0 to 18 Vdc modulating devices. The span corresponding to each switch is given on the printed wiring board below each switch. Fig. 16 shows the location of this switch, the zeroing dial, and how to set the voltage span. See Fig. 19 for a summary of action/direction switches.

Keypad Programming and Display

The T775J uses a liquid crystal display (LCD) for interactive prompting during programming and display of sensed temperatures and assigned setpoint and differential values. User programming of the T775J is through four programming keys.

321

BRW

Fig. 20. Modulating output terminals.

Programming Keys

The four programming keys are Select, Up arrow, Down arrow and Enter.

• Select key sequentially prompts the user for what parameter is being displayed: setpoint, differential, stage energized, heat or cool (operation mode), 1, 2 (indicating assigned stage). Once the last parameter value is viewed, pressing the Select key will again display the control values from the beginning of the display loop.

• Up and Down arrow keys allow the displayed parameters to be increased or decreased. After pressing the Select key, a control value can be changed by using the arrow keys. Control values will be increased or decreased by 1° F or C each time the arrows are depressed.

• Enter key places the new value into the memory of the microprocessor. A control value or operation will not be effective in the memory until the Enter key is depressed. Control values and operation selection will remain in the device memory even after power is removed.

• The Select and Enter keys must be pressed simultaneously to change the control algorithm from heating to cooling or from cooling to heating. These parameters (heat and cool) are not displayed during normal Select key sequences. The only parameters displayed after pressing the Select and Enter keys at the same time are stage indication and Heat or Cool. To change the operation from heating to cooling or vise versa for a desired output stage, use the arrow keys as required. Once the mode is changed, depressing the Enter key is necessary to enter this change into the microprocessor memory. The next stage of heat or cool assignment will appear after the Select key is pressed. When all stages are selected, the display will revert back to sensed temperature and load energized status.

(SERIES 90) (4-20 mA AND 0-18 Vdc)

M2133A

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

Display

Once power is applied or restored to the device, the display will count down from 210 until the display reads zero, during which time any previously energized outputs will be deenergized. This is intended to protect compressors in the event of a power outage.

To avoid viewing this entire countdown, press the Select key. The LCD display will now show what it normally reads: load (sensed) temperature, stages energized, and which Sensor (A or B) is being read. At any time during the programming or review procedure, the display will revert back to showing the sensed temperature and stage status indication 60 seconds after the last key closure.

The user has three display options to select. The display can be configured to alternately indicate Sensor A and Sensor B sensed temperature at a five second rate or the display can be locked on to sensor A or sensor B to sense temperature continuously.

This selection is accomplished by stopping at Sensor A or Sensor B sensed temperature points in the Select key scrolling loop. To lock on to either sensor, the user must scroll the Select key through the loop to select the sensed temperature prompt desired. The display will stick to that parameter until the Select key is activated to advance the loop. When the loop is stopped at any other prompt, the display will alternately indicate Sensor A and Sensor B sensed temperatures after 60 seconds from the last key closure or immediately after the Select key is pressed at the end of the programming sequence.

Error Messages

There are seven error messages that can be displayed in response to software or hardware problems with the T775J. The error codes that may be seen flashing on the display are:

SF—Sensor Failure.

The display flashing SF indicates an out-of-range sensor. Make sure the sensors are properly connected. For the T775J, stage 2 load will be deenergized when this error message is flashing for Sensor B. When this message is flashing for Sensor A only, stage 1 will

EF—EEPROM Failure.

The values read back from the EEPROM are not the same as written into the EEPROM. The EEPROM is not intended for field repair. Replace the device.

CF—Calibration Failure.

A calibration resistor reading was not within the range of the Analog to Digital converter. This error message can not be field repaired. Replace the device.

OF—Stray interrupt Failure.

An unused interrupt occurred. This error cannot be field repaired. Replace the device.

CE—Configuration Error.

not

be de-energized.

The device hardware was configured to a nonexistent device. This error cannot be field repaired. Replace the device.

OE—ROM Error.

The internal ROM of the microprocessor is defective. This error cannot be field repaired. Replace the device.

AE—RAM Error

The internal RAM of the microprocessor is defective. This error cannot be field repaired. Replace the device.

Setpoint Calibration

To maintain temperature accuracy, sensor wires should be 18 AWG two-conductor (18/2). If the length of the sensor wire exceeds 400 feet, recalibration will be necessary to maintain accuracy (see Fig. 21). Table 2 shows the corresponding temperature offset that should be used for different sensor wire lengths. This temperature offset should be added to the desired temperature setpoint for these applications.

RESISTANCE (OHMS)

4200

4000

3800

3600

3400

3200

20 40

-7

Fig. 21. Resistance versus temperature

performance characteristics.

Table 2. Sensor Wire Length/Calibration Offset

Sensor Wire Length (ft) Calibration Offset (°)

0-399 None required. 400-599 1 600-799 2

800-1000 3

3484 ± 6.5 OHMS AT 77°F (25°C)

80 100 120

20 30

40 50

TEMPERATURE (DEGREES)

(Using 18 Awg Wire).

140 160

70 80 90

180 200 220

100

M2829

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

CHECKOUT

After the controller is installed and wired, apply power. Using the programmed control values, verify device operation after completing Table 3.

쐃 As illustrated in the example, record the sensed

temperatures for both Sensor A and Sensor B as displayed on the controller. Sensor A senses the temperature for loads 1 and 2. Sensor B senses the temperature that determines the amount of reset.

쐇 Write the operating mode for each stage in the

Checkout Table (heat or cool).

쐋 Write Sensor A temperature for each load on the

Sensed Temp

쐏 Write Sensor B temperature in the space indicated in

the Checkout Table.

쐄 Press Select until Setpoint B is displayed. 쐂 Write Setpoint B in the space indicated in the Checkout

Table.

쐆 Determine the reset direction (up or down) from the

Device Programming Worksheet in the Installation section and enter in the space indicated in the Checkout Table.

쐊 Determine the reset action (above or below) from the

Device Programming Worksheet and enter in the space indicated in the Checkout Table.

쐎 Plot the programmed on and off (open/closed) values at

which the device will energize and deenergize each output load by referring to the Device Programming Worksheet.

쐅 Calculate the amount of reset that exists using

Formula 1.

a. Subtract setpoint B from Sensor B and enter the

result as Temp Diff.

b. If the result is negative, reset will occur only if the

Reset Action Switch is set for reset below setpoint. If the result is positive, reset will occur if the Reset Action switch is set for reset above

setpoint. c. Determine if a reset condition exists. d. If no reset condition exists, On/Off Control Values

have not been changed. e. Go to step 11. f. If a reset condition exists, calculate the amount of

reset using Formula 2.

line.

g. Divide Reset Ratio B value by Reset Ratio A

value.

h. Multiply the result in step g. by Temp Diff

(step a.).

i. If Reset Direction Switch is set to increase,

disregard any negative signs and add the amount of reset calculated in step h. to the on/off values.

j. If the Reset Direction Switch is set to decrease,

disregard any negative signs and subtract the amount of reset calculated in step h. from the on/ off values.

k. Plot the new values on the appropriate Reset

Load in the Checkout Table.

쐈 Verify which loads are energized by using the Checkout

Table. As shown in the example, the display will indicate which stages are energized in the lower right-hand corner. (NOTE: If no stages are energized, the words

stage energized

NOTE: If the sensed temperature is between the on and

off temperatures, the load may be either energized or deenergized. Refer to the Control Algorithm subsection of Description/Operation section for further explanation.

쐉 If an error message flashes, refer to the description of

these messages in Error Messages subsection. If SF flashes, check the sensor connections. If they are properly connected and SF continues to flash, check the sensor location to assure it is located in an ambient condition that is within the sensor’s ambient capability (-40°F to +220°F).

씈 If an error message other than SF flashes, the device

cannot be field repaired. Replace the device.

For the Electronic Series 90 output (T775J1019 and T775J1043), proper output levels can be checked by measuring the open-circuit voltage between terminals 1(W) and 2(R):

Minimum (Drive Closed) signal ≤0.17 Vdc. Maximum (Drive Open) signal ≥1.7 Vdc.

will not appear.)

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

Table 3. Checkout Table.

Checkout Table Checkout Table Example

Heat or

Cool Load 1 Load 2

Value

Load 1

Sensor A ____ Sensor B ____

Sensed Temp

Setpoint B ____________ Reset Direction __________ Setpoint B 30° Reset Direction Increase Sensor B _____________ Reset Action ____________ Sensor B Reset Ratio A _________ Reset Ratio B ___________ Reset Ratio A

FORMULA 1: FORMULA 1 EXAMPLE:

Sensor B Sensor B = 10°F

-Setpoint B Setpoint B = 30°F

Reset

Reset Value

Load 2

Heat or

Cool

Sensor A

80°

Sensor B

10°

Sensed

Temp

Load 1

Heat

Load 2

Heat

Value

Load 1

120° Off 116° On

Reset

80° Off

80°

78° Off

76° On

74° On

10° Reset Action Below 1 Reset Ratio B 2

Reset Value

Load 2

118° Off

80°

Temp Diff = _______________________ Temp Diff = -20°F

FORMULA 2: FORMULA 2 EXAMPLE:

Amount of Reset =

Reset Ratio B Amount of Reset = 2 x (-20) = -40 Reset Ratio A 1

63-2248—4

T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

Home and Building Control

Honeywell Inc. 1985 Douglas Drive North Golden Valley, MN 55422

63-2248—4 Rev. 9-95 Printed in U.S.A. www.honeywell.com/building/components

63-2248—4

Home and Building Control

Honeywell Limited-Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9

Helping You Control Your World

QUALITY IS KEY

Honeywell T775J User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual