Honeywell T775U 2000 Series, Installation Instructions Manual

Page 1: ...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 of ...

Page 2: ...sors 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...

Page 3: ...terface and Programming overview see page 11 5 Setup see page 14 6 Programming the Controller with no Reset see page 26 or Programming the Controller with Reset page 29 7 Scheduling optional see page 34 Additional topics are Sensor calibration begins on page 11 Interface overview begins on page 11 Summary menu begins on page 38 Troubleshooting begins on page 38 MOUNTING This section describes the ...

Page 4: ...e 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 Connections Access To access the wiring connections remove the two screws on the left side of the enclosure and gently swing open the ...

Page 5: ...ommended 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 on page 2 NOTES 1 Other transmitters can be wired in the same manner For example the 0 10Vdc wiring shown in Fig 5 on page 6 ...

Page 6: ...DITY SENSOR 0 10 VDC CONNECTION SENSOR A 1 SENSOR B C S V T T VO GND VIN C S V SHIELDED CABLE M24890C V S SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND DO NOT GROUND SHIELDED CABLE AT SENSOR END TO MINIMIZE NOISE PICKUP MAKE SENSOR CONNECTION FROM SHIELDED CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY THE T775 HAS AN INTEGRAL LOAD OF 500 OHMS WHICH RESULTS IN A 10V DROP AT 20MA TO USE 4 ...

Page 7: ...d low voltage 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 con...

Page 8: ...V 4 20mA input see Fig 7 on page 6 24 Vac Power T T Temperature Sensor polarity insensitive 24V 24 Vac Hot Common 24 Vac Common Sensor B T T Temperature Sensor polarity insensitive Ground Earth Groundc c A separate earth ground is required for all installations regardless of the power source 24 120 or 240 Vac 120 or 240 Vac Power Input 120 Vac 120 120 Vac Power DI Digital Input dry contact Common ...

Page 9: ...or Two stage Control with 120 Vac 120 Vac Input and 120 Vac Load Fig 15 Wiring for Two stage Control with 240 Vac 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 M24557B MODULATING OUTPUT TERM...

Page 10: ... hours after a power outage After a power loss of more than 24 hours the date and time settings may need to be reentered All other settings are stored permanently M24559 DIGITAL INPUT T1 T2 C R POWER USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC 1 HONEYWELL MODUTROL MOTOR WITH VOLTAGE CONTROL INPUT 1 F M24558B MODULATING OUTPUT TERMINAL MOD 1 B R W B R W M24560B TO VERIFY OUTPUT TEST OPEN CI...

Page 11: ...e F 3 85 Ohms per degree C Fig 20 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 Table 3 Calibration Range Examples Units Min Value Example Max Value Example ...

Page 12: ...e is displayed e g 70 F the up and down arrows increase and decrease the value NOTE Once you select an item from a list or enter a value pressing the t or u or HOME button accepts your selection or value and stores it in the controller s memory Home Screen In the normal run state the LCD home screen displays the current sensed temperatures the modulating outputs status the active status of the out...

Page 13: ...rest 2 The menus can display only those relays that are defined in Setup see 1 3 2 NBR OF RELAYS on page 22 For example if you configure only one relay then only one relay displays on the appropriate menus 3 If you press the HOME button or there is no keypad activity for four minutes you exit Pro gram mode and return to the home screen 4 If you press the MENU button you exit Program mode and retur...

Page 14: ...ntinue with 4 Scheduling on page 34 1 SETUP Setup provides the ability to change the factory default settings for the temperature sensors and outputs to enable disable reset control and to enable disable scheduling NOTE 1 The T775U controller interface is intuitive You may find that you do not need the following setup instructions for the sensors and out puts You may want to use this procedure sim...

Page 15: ...SORS The 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 u button to display the number of sensors 2 Use the p and q buttons to enter the number of sen sors 1 or 2 Default 2 3 Press the u button to accept the value and d...

Page 16: ...1 From the Sensor A selections use the p and q but tons to highlight UNITS 2 Press the u button to display the temperature units 3 Use the p and q buttons to highlight F or C Default F Fahrenheit 4 Press the u button to accept the units and return to the Sensor A selections Continue with 1 2 2 3 CALIBRATE Sensor A or B Fig 30 Setup Sensors Sensor A Units 1 2 2 2 2 UNITS Sensor A only 0 5V 0 10V or...

Page 17: ...ue 3 Use the p and q 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 11 for examples 4 Press the u button to accept the value and return to the Sensor A selections Fig 33 Setup Sensors Sensor A Label 1 2 2 4 LABEL Sensor A or B input For a sensor already ...

Page 18: ...through 1 2 2 4 LABEL Sensor A or B input beginning on page 15 but perform only those steps applicable to Sensor B 4 Press the t button to exit SENSOR B and return to the Sensors menu or Use the p and q buttons to highlight EXIT and press the u button 5 Press the t button to exit the Sensors menu and return to the Setup menu Continue with 1 3 Setting up the Outputs Fig 36 Setup Outputs Menu 1 3 Se...

Page 19: ...ion Using the time clock or digital input to disable the output forces the output to 0 1 From the Mod menu use the p and q buttons to highlight MIN OUT 2 Press the u button to display the Min Out 3 Use the p and q buttons to increase decrease the desired value from 0 to 100 in 1 increments Default 0 Range 0 to 100 4 Press the u button to accept the percentage and return to the Mod menu Fig 40 Setu...

Page 20: ...lling to a setpoint even with a wide throttling range Fig 41 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 th...

Page 21: ...od 1 2 Hide 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 p and q buttons to highlight HIDE 2 Use the p and q buttons to highlight YES or NO Default YES 3 Press the u 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 scr...

Page 22: ...n to display the schedule selections 2 Use the pand q buttons to highlight YES or NO Default NO 3 Press the u 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 scheduli...

Page 23: ...0 to 990 seconds 3 Press the u button to accept the seconds and display the DI OPTIONS NOTES 1 The minimum off time applies to all relay outputs 2 When minimum off time is active relays waiting to be energized display a flashing square underneath the relay number on the home screen 3 If the minimum off time is not equal to zero 0 the minimum off time activates at power up To manually override pres...

Page 24: ...ays to 100 Use this option carefully IGNORE causes the digital input to have no effect on the Relay or Mod outputs Fig 51 Setup Outputs Options Show Runtime 1 3 3 4 SHOW RT show run time hours 1 Press the u button to display the Show RT values 2 Use the p and q buttons to select YES or NO Default YES 3 Press the u button to accept the value and return to the Options menu Selecting YES shows the RT...

Page 25: ...chedule If NO is selected the Setback selection does not appear in the Program menu for this output Fig 55 Setup Outputs Relay Reset 1 3 4 2 RESET IMPORTANT For relays to use the Reset function of the con troller both modulating outputs MOD 1 and MOD 2 must be set for Reset Relays that have Reset set to YES use the reset curve configured for MOD 1 1 Press the u button to display the Reset values 2...

Page 26: ...tup Press the t button to exit the selected relay set up and return to the Outputs menu To setup the next relay output go to 1 3 4 Setting up the Relays on page 25 When you finish setting up the relay outputs continue with 1 4 Exiting Setup 1 4 Exiting Setup Press the HOME button to exit Setup mode and return to the home screen display or Use the p and q buttons to highlight EXIT from the menu and...

Page 27: ...crease decrease the desired setpoint temperature Default 70 F 21 C Range 40 F to 248 F 40 C to 120 C 4 Press the u button to accept the setpoint tempera ture and display the next option Fig 61 Program Setback 2 1 3 SETBACK The Setback temperature option displays only if scheduling is enabled see Fig 48 on page 22 or the DI Option is set to Setback see Fig 50 on page 24 This is the desired setpoint...

Page 28: ...setpoint setting e g if the setpoint is 72 F and the throttling range is 10 F then the effective throttling temperature range is 67 F to 77 F In heating mode the Differential is below the setpoint The relay de energizes when the temperature rises to the setpoint As the temperature drops to the setpoint minus the Differential the relay energizes In cooling mode the Differential is above the setpoin...

Page 29: ...to record your selection Fig 65 Reset Setup NOTE The first output Mod 1 must be set for Reset to enable the controller s Reset function 3 1 Setting Up the Controller for Reset 1 Press and hold the MENU button for five seconds to enter Setup mode 2 Then choose OUTPUTS u MOD1 u RESET u then select YES BOILER or YES OTHER Fig 65 You can now press the HOME button to exit Setup mode and continue with D...

Page 30: ...E The Setback parameter displays only if scheduling is enabled see Fig 48 on page 22 or the DI Option is set to Setback see Fig 50 on page 24 Fig 68 Program Sensor A Max Setpoint 3 2 1 SP MAX A1 or BOILER MAX Setpoint maximum for Sensor A 1 From the menu use the p and q buttons to highlight BOILER MAX or SP MAX A1 2 Press the u button to display the maximum setpoint value 3 Use the p and q buttons...

Page 31: ... Press the u button to accept the value and display the next option Fig 72 Program Throttling Range or Differential 3 2 5 THROTTLING RANGE or DIFFERENTIAL Throttling Range displays for Modulating outputs Differential is used for the Relay outputs 1 From the menu use the p and q buttons to highlight THROT RNG or DIFFERNTL 2 Press the u button to display the throttling range value 3 Use the p and q ...

Page 32: ... see Fig 50 on page 24 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 p and q buttons to highlight...

Page 33: ...re OFFSET Default 0 F OFFSET Range 150 F to 150 F 101 C to 66 C 4 Press the u 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 31 3 4 Exit Programming with Reset When...

Page 34: ... to the 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 t to scroll backward through the Setup menus Right arrow button u to select the highlighted menu item and display its content Up and Down arrow buttons p and q to scroll up and down through a list of items or to increase or decrease the val...

Page 35: ... the p and q buttons to highlight SET DATE 2 Press the u button to display the current system date setting 3 Use the u button to cycle between the month day and year values 4 Use the p and q buttons to increase decrease the desired value for the month day and year 5 Press the t button to accept the Date and return to the Options menu Fig 81 Schedule Options Daylight Saving Time 4 2 3 DAYLIGHT dayl...

Page 36: ...1 E1 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 83 Schedule Event 1 Setpoint 4 3 1 E1 SETPT setpoint for event 1 1 From the selected time period menu use the p and q buttons to highlight E1 SETPT 2 Press the u button to display the setpoint options 3 Use the p and q buttons to highlight the desired option 4 Pr...

Page 37: ...36 above 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 t 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 pe...

Page 38: ...the same 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 157...

Page 39: ...rence to radio 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...

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