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INTERFACE OVERVIEW

T775U SERIES 2000 CONTROLLER

62-0255–05

Fig. 19 shows how sensor resistance varies with
temperature for a sensor having a positive temperature
coefficient (PTC) of 2.1 Ohms per degree F (3.85 Ohms
per degree C).

Fig. 19. Sensor Resistance vs. Temperature.

INTERFACE OVERVIEW

The T775U controller uses an LCD panel and 6-button
keypad to provide status information and permit user input
of the programming, setup, and scheduling parameters.

The following figure describes the display areas of the
LCD and the keypad.

Fig. 20. LCD Display - Home Screen And Keypad.

Menu Area

– On the home screen, the LCD displays the

configured relays and whether they are active. In
Program, Setup or Schedule mode, the LCD displays the
current menu selection and its order within the menu
hierarchy.

Data Area

– On the home screen, the LCD displays the

sensors and outputs status. In Setup or Program mode,
the LCD displays menu choices, parameter selections,
and data values.

Lock Icon

– The icon indicates the MENU button is

locked and prevents access to the Setup and Program
menus.

NOTE: Pressing and holding the

HOME

and MENU but-

tons simultaneously for five seconds locks/
unlocks the MENU button.

6-Button Keypad

– The keypad is used to access the

menus and enter values (see “Using the LCD Panel
Interface”).

Using the LCD Panel Interface

The 6-button keypad is used to move through the menus
and enter or change parameter values.

Home Button

Pressing the

HOME

button at any time exits the current

Programming or Setup display screen and returns to the
home screen as shown in Fig. 20 and Fig. 21.

Menu Button

• Pressing the MENU button always displays the

Program menu. If you are in Setup mode, you exit
setup and return to the Program menu.

• Pressing and holding the MENU button for five

seconds leaves the current screen and displays
the Setup menu.

Left and Right Arrow Buttons (

and

)

Use these buttons to move backward (

) and forward (

)

through the Program and Setup menus.

Table 4. Temperature Sensor Calibration for

Resistance Loss due to Wire Length.

AWG

Rating

/ft

Temperature Offset in

°F (Feet)

This is the distance from the controller to the sensor
(already accounts for round trip distance).

200 ft

500 ft

1,000 ft

2.5

0.46

1.14

2.28

4.0

0.72

1.82

3.64

6.4

1.16

2.90

5.82

10.2

1.86

4.64

9.28

16.1

2.92

7.32

14.64

AWG

Rating

Temperature Offset in

°C (Meter)

100 m

200 m

300 m

8.3

0.44

0.86

1.30

13.2

0.68

1.38

2.06

21.0

1.10

2.18

3.28

33.5

1.74

3.48

5.22

52.8

2.74

5.48

8.22

M24304

TEMPERATURE (DEGREES)

RESISTANCE (OHMS)

1403

1317

1231

1145

1059

973

80 100 120 140 160 180 200 220

10 20 30 40 50 60 70 80 90 100

°F

°C

-20

-40

120

110

250

-40

-20 -10

-30

1489

887

801

1097 ± 0.08 OHMS

AT 77°F (25°C)

POSITIVE TEMPERATURE COEFFICIENT (PTC) OF 2.1 OHMS PER °F

MOD1 40%

MOD2 60%

DI ON

HOME

RELAYS 1 2

SENSORS

SENSOR A

SENSOR B

MENU AREA

home

DATA AREA

LOCK ICON

6 BUTTON KEYPAD

M24563

Содержание T775U2006

Страница 1: ...ng safety or limit controls a separate safety or limit control device is required Table 1 T775U Controller Configurations Controller Modela a The T775U includes a digital input for use with the disable or setback option Description Replaces Output Reset SPDT Relay Outputs Analog Mod Outputsb b The modulating analog outputs may be 4 20 mA 0 10 Vdc 2 10 Vdc or Series 90 selectable Sensor Inputs Nbr ...

Страница 2: ...rs and is settable in PPM units Universal Sensors Sensor A only The controller accepts 0 5 Vdc 0 10 Vdc or 4 20 mA input for temperature pressure humidity CO2 etc They may be programmed in units of F C Pa kPa PSI In W C PPM or may be unitless none The PPM range is 0 to 9990 Choosing none for units results in no units being displayed on the home screen If no unit is specified the range is 9999 to 9...

Страница 3: ...erface and Programming overview see page 11 5 Setup see page 13 6 Programming the Controller with no Reset see page 25 or Programming the Controller with Reset page 28 7 Scheduling optional see page 33 Additional topics are Sensor calibration begins on page 10 Interface overview begins on page 11 Summary menu begins on page 37 Troubleshooting begins on page 37 MOUNTING This section describes the m...

Страница 4: ...l series wired to sense average temperatures in large spaces See Fig 3 on page 5 WIRING All wiring must comply with applicable electrical codes and ordinances or as specified on installation wiring diagrams Controller wiring is terminated to the screw terminal blocks located inside the device The remainder of this section describes the sensor wiring and the T775U controller wiring Wiring Connectio...

Страница 5: ... as a temperature input Sensors use standard AWG 18 unshielded wire For cable runs greater than 25 feet shielded cable is recommended The sensors in Fig 5 8 beginning on page 6 are examples and illustrate voltage and current wiring for 3 wire and 2 wire sensors to the Sensor A terminal For terminal wiring details see Fig 11 and Table 2 on page 8 Other sensors are supported See sensor descriptions ...

Страница 6: ...SOR 0 10 VDC CONNECTION SENSOR A 1 SENSOR B C S V T T VO GND VIN C S V SHIELDED CABLE M24890A V S NOTES 1 SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND HOWEVER DO NOT GROUND SHIELDED CABLE AT SENSOR END 2 TO MINIMIZE NOISE PICKUP MAKE SENSOR CONNECTION FROM SHIELDED CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY 3 THE T775 HAS AN INTEGRAL LOAD OF 500 OHMS WHICH RESULTS IN A 10V DROP AT 20...

Страница 7: ...ltage wiring Knockouts C D and E can be used to gain access to the load relay output terminals and 120 240 Vac power wiring Controller Wiring Method Wire the sensors and outputs then wire the power connection Each terminal can accommodate the following gauges of wire Single wire from 14 AWG to 22 AWG solid or stranded Multiple wires up to two 22 AWG stranded For 24 120 or 240 Vac power connections...

Страница 8: ...scription of Wiring Terminal Connections Connection Terminal Label Description Connection Terminal Label Description Sensors Outputs Sensor Aa a For applications that do not use Reset only Sensor A is available for use C common S signal V voltage 0 10 Vdc input Universal sensor for humidity pressure temperature etc Mod 1 Vdc or mA W R B Series 90 b b For Series 90 connections you must insert a 340...

Страница 9: ...oad Fig 15 Wiring for Digital Input dry contact Fig 16 Wiring for mod motor or direct coupled actuator with 0 10 Vdc control input L1 HOT L2 24 VAC COM NO COM NO M24554A C S V T T LOAD 2 LOAD 1 C NO NC C NO NC C FOR SPECIFIC SENSOR WIRING TEMPERATURE HUMIDITY PRESSURE ETC REFER TO THE SENSOR WIRING SECTIONS BEGINNING ON PAGE 4 1 1 USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC 1 M24557A MODUL...

Страница 10: ...e amount shown in the Table 4 on page 11 For example a wire run with 18 gauge wire of 1 000 feet requires a calibration offset of 6 0 F IMPORTANT If the calibration value in the table exceeds the controller s calibration limits of 10 F 6 C you must use a heavier gauge wire For example with a wire run of 1 000 feet you must use 20 AWG wire or heavier in order to cal ibrate for wire loss within the ...

Страница 11: ...h the menus and enter or change parameter values Home Button Pressing the HOME button at any time exits the current Programming or Setup display screen and returns to the home screen as shown in Fig 20 and Fig 21 Menu Button Pressing the MENU button always displays the Program menu If you are in Setup mode you exit setup and return to the Program menu Pressing and holding the MENU button for five ...

Страница 12: ...screen displays the effective setpoint IMPORTANT After four minutes of inactivity no buttons pressed the LCD display reverts to the home screen display Accessing the Menus Menus are used for programming scheduling viewing the summary settings and setup of advanced options Program Schedule and Summary Menus To access these menus from the home screen press the MENU button See Fig 22 Fig 22 Menus Dep...

Страница 13: ... energizes Setpoint High Limit You can set an irreversible setpoint high limit maximum value for any single displayed setpoint value Adjust the setpoint at any output to the desired maximum setpoint Then simultaneously press the HOME W and X buttons and continue to press all three buttons for five seconds to set the setpoint high limit maximum to this value NOTE You must press all three buttons at...

Страница 14: ...he value entered here determines the number of sensors displayed on the home screen NOTE For applications that do not use Reset only one sensor Sensor A is available for use 1 From the Sensors menu highlight SENSORS then press the X button to display the number of sensors 2 Use the S and T buttons to enter the number of sensors 1 or 2 Default 2 3 Press the X button to accept the value and display ...

Страница 15: ...m the Sensor A selections use the S and T buttons to highlight UNITS 2 Press the X button to display the temperature units 3 Use the S and T buttons to highlight F or C Default F Fahrenheit 4 Press the X button to accept the units and return to the Sensor A selections Continue with 1 2 2 3 CALIBRATE Sensor A or B Fig 29 Setup Sensors Sensor A Units 1 2 2 2 2 UNITS Sensor A only 0 5V 0 10V or 4 20m...

Страница 16: ... the S and T buttons to increase decrease the desired calibration value Default 0 0 Sensor Range Temperature 10 F 6 C Other Sensor Range 10 of the Min to Max values specified previously See Table 3 on page 10 for examples 4 Press the X button to accept the value and return to the Sensor A selections Fig 32 Setup Sensors Sensor A Label 1 2 2 4 LABEL Sensor A or B input For a sensor already labeled ...

Страница 17: ... 1 2 2 4 LABEL Sensor A or B input beginning on page 14 but perform only those steps applicable to Sensor B 4 Press the W button to exit SENSOR B and return to the Sensors menu or Use the S and T buttons to highlight EXIT and press the X button 5 Press the W button to exit the Sensors menu and return to the Setup menu Continue with 1 3 Setting up the Outputs Fig 35 Setup Outputs Menu 1 3 Setting u...

Страница 18: ...g the time clock or digital input to disable the output forces the output to 0 1 From the Mod menu use the S and T buttons to highlight MIN OUT 2 Press the X button to display the Min Out 3 Use the S and T buttons to increase decrease the desired value from 0 to 100 in 1 increments Default 0 Range 0 to 100 4 Press the X button to accept the percentage and return to the Mod menu Fig 39 Setup Output...

Страница 19: ...o a setpoint even with a wide throttling range Fig 40 Setup Outputs Mod Out Derivative 1 3 1 4 DERIVATIVE The Derivative default value is factory set to zero no derivative control It is strongly recommended that the derivative remain at zero 0 unless you have a very good reason to adjust it Derivative control is not needed in the vast majority of HVAC applications 1 From the Mod menu use the S and...

Страница 20: ...ide 1 3 1 7 Hide The Hide option is used to prevent the MOD 1 and MOD 2 outputs from displaying on the Home screen 1 From the Mod menu use the S and T buttons to highlight HIDE 2 Use the S and T buttons to highlight YES or NO Default YES 3 Press the X button to accept the selection and return to the MOD menu NOTE The MOD1 and MOD2 outputs are still active even when hidden from the Home screen Fig ...

Страница 21: ...play the schedule selections 2 Use the Sand T buttons to highlight YES or NO Default NO 3 Press the X button to accept the value and display the MIN OFF option Selecting NO disables scheduling for all outputs Selecting YES enables scheduling for all outputs When YES is selected all individual outputs default to follow the schedule However each individual output can be removed from scheduling as de...

Страница 22: ...nt Setback values entered in the Schedule 1 Press the X button to display the DI Option selec tions 2 Use the S and T buttons to highlight DISABLE SETBACK or IGNORE Default DISABLE 3 Press the X button to accept the value and display the SHOW RT option When the digital input DI closes all outputs follow the DI option value Disable Setback or Ignore DISABLE disables the outputs relays return to de ...

Страница 23: ...and T buttons to highlight the desired relay 1 or 2 2 Press the X button to display the selected Relay menu Continue with the remainder of this section to setup the relay outputs Fig 53 Setup Outputs Relay Schedule 1 3 4 1 SCHEDULE This selection displays only if Use Sched YES is selected during the Output Options setup see page 21 When selected individual outputs default to follow the schedule 1 ...

Страница 24: ...to select YES or NO Default NO 3 Press the X button to accept the value and return to the Relay menu Selecting YES immediately resets the output run time hours to zero for this output When you subsequently return to this screen the RESET RT defaults to NO NOTE Run times can be reset to zero for each individ ual relay You must do this for each relay that you want to reset to zero Fig 56 Setup Outpu...

Страница 25: ...s the screens for selecting MOD 1 but other than as noted below the programming is the same for each output NOTE For Relays DIFFRNTL replaces THROT RNG NOTE The Setback parameter displays only if schedul ing is enabled see Fig 47 on page 21 or the DI Option is set to Setback see Fig 49 on page 22 Continue with 2 1 2 SETPOINT Fig 59 Program Setpoint 2 1 2 SETPOINT 1 From the menu use the S and T bu...

Страница 26: ...r DIFFERENTIAL Throttling Range displays for Modulating outputs Differential is used for the Relay outputs 1 From the menu use the S and T buttons to high light THROT RNG or DIFFERNTL 2 Press the X button to display the throttling range value 3 Use the S and T buttons to increase decrease the desired value Default 20 F 6 6 C Range 1 F to 150 F 1 C to 66 C 4 Press the X button to accept the value a...

Страница 27: ...2 Program Next Output Modulating Output or Relay For the next output select the desired MOD or Relay from the Program menu see Fig 57 on page 25 Go to 2 1 2 SETPOINT on page 25 to continue programming When you finish programming the outputs continue with 1 3 Exit Programming without Reset 1 3 Exit Programming without Reset Press the HOME button to leave programming mode and return to the home scre...

Страница 28: ...t be sensing the controlled temperature e g Boiler Sensor B must be sensing the resetting temperature e g outdoor temp To program an output for Reset refer to the values as shown in the examples below Choose your own appropriate values for Sensor A maximum and minimum and Sensor B maximum and minimum Reset Example see Fig 65 Sensor A is the boiler sensor and Sensor B is the outdoor sensor Maximum ...

Страница 29: ...X or SP MAX A1 2 Press the X button to display the maximum setpoint value 3 Use the S and T buttons to increase decrease the desired maximum setpoint temperature Default 180 F 82 C Range 40 F to 248 F 40 C to 120 C 4 Press the X button to accept the setpoint tempera ture and display the next option Fig 68 Program Sensor B Max Setpoint 3 2 2 RESET B1 or OUTSD MIN Sensor B value when at SP MAX A1 Se...

Страница 30: ...odulating outputs Differential is used for the Relay outputs 1 From the menu use the S and T buttons to high light THROT RNG or DIFFERNTL 2 Press the X button to display the throttling range value 3 Use the S and T buttons to increase decrease the desired value Default 20 F 6 6 C Range 1 F to 150 F 1 C to 66 C 4 Press the X button to accept the value and display the next option The Throttling Rang...

Страница 31: ...t to Setback see Fig 49 on page 22 This value is the number of degrees plus or minus that you want the temperature to be offset from the setpoint For example If you want the temperature to be 10 F less than the setpoint during setback mode enter 10 F In normal operations for heating the offset will be negative For cooling the offset will be a positive value 1 From the menu use the S and T buttons ...

Страница 32: ...ed temperature OFFSET Default 0 F OFFSET Range 150 F to 150 F 101 C to 66 C 4 Press the X button to accept the value and display the next option 3 3 2 Second Modulating Output and Relays Programming To complete the programming of MOD 2 or a Relay perform the procedures in 3 2 5 THROTTLING RANGE or DIFFERENTIAL through 3 2 7 SETBACK OFFSET if configured beginning on page 30 3 4 Exit Programming wit...

Страница 33: ...he home screen 2 If you press the MENU button you exit Scheduling mode and return to the menu To create or change a schedule you use the Left arrow button W to scroll backward through the Setup menus Right arrow button X to select the highlighted menu item and display its content Up and Down arrow buttons S and T to scroll up and down through a list of items or to increase or decrease the value of...

Страница 34: ... S and T buttons to highlight SET DATE 2 Press the X button to display the current system date setting 3 Use the X button to cycle between the month day and year values 4 Use the S and T buttons to increase decrease the desired value for the month day and year 5 Press the W button to accept the Date and return to the Options menu Fig 80 Schedule Options Daylight Saving Time 4 2 3 DAYLIGHT daylight...

Страница 35: ...SETPT setpoint for event 1 The following figures show the MON FRI menu but the menu selections are the same for any time period Fig 82 Schedule Event 1 Setpoint 4 3 1 E1 SETPT setpoint for event 1 1 From the selected time period menu use the S and T buttons to highlight E1 SETPT 2 Press the X button to display the setpoint options 3 Use the S and T buttons to highlight the desired option 4 Press t...

Страница 36: ...bove 4 3 4 E2 TIME time for event 2 Creating the time for event 2 is accomplished the same way as the first event See 4 3 2 E1 TIME time for event 1 above 4 3 5 EXIT exit from selected time period settings After entering the time for event 2 use the W button to exit the schedule time period and return to the Schedule menu to select a different time period When you finish scheduling the time period...

Страница 37: ...ame as written into the EEPROM This error cannot be field repaired Replace the device Diagnostic Messages There are two diagnostic messages that can display in response to sensor problems The diagnostic codes that can flash on the display are Sensor Open or Shorted Two dashes display when a sensor typically temperature is open or shorted An open circuit is considered anything greater than 1570 ohm...

Страница 38: ...adio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause interference to radio or television equipment reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna M...

Страница 39: ...T775U SERIES 2000 CONTROLLER 39 62 0255 05 ...

Страница 40: ...ns 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 U S Registered Trademark 2009 Honeywell International Inc 62 0255 05 M S Rev 02 09 ...

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