T775U Series 2000 Electronic Stand-Alone Controller INSTALLATION INSTRUCTIONS PRODUCT DESCRIPTION The T775 electronic stand-alone controllers are the next generation of universal controls capable of remote sensing of temperature, humidity, pressure, etc. and providing switched and proportional outputs to various types of loads. A built-in time clock is standard. The T775U controller allows a wide range of sensors to be configured.
T775U SERIES 2000 CONTROLLER PRODUCT DESCRIPTION Temperature Sensorsa (Sensor A or B) Humidity Sensors (Sensor A only) The controller accepts 1,097 Ohms PTC at 77°F (25°C): • 50021579-001 – Standard sensor (included with all models except NEMA 4X models) • T775-SENS-WR – Water resistant with 5 foot leads (included with NEMA 4X models) • T775-SENS-WT – Watertight with 6 foot lead • T775-SENS-OAT – Outdoor air temperature sensor • C7031D2003 – 5 inch immersion sensor with wiring box (use immersion well; P
BEFORE INSTALLATION BEFORE INSTALLATION Review the “Specifications” on page 35 before installing the controller. When Installing This Product 1. 2. 3. 4. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check ratings given in instructions and on the product to ensure the product is suitable for your application. Installer must be a trained, experienced service technician.
T775U SERIES 2000 CONTROLLER WIRING Temperature Sensor Wiring For example, in a reset control based on outside temperature, Sensor A must be the inside sensor and Sensor B must be the outside sensor. CAUTION Multiple Parallel Temperature Sensors Electrical Shock Hazard. Can short equipment circuitry. Make sure that metal tube of sensor does not short against T terminals in wall-mounted case. Multiple sensors can be parallel-series wired to sense average temperatures in large spaces.
WIRING T775U SERIES 2000 CONTROLLER Humidity, Pressure, and Universal Sensor Wiring SHIELDED CABLE NOTES: Sensors with a with a 0-10Vdc or 4-20mA input to the T775U must be wired to the Sensor A terminal. Sensor B is used only as a temperature input for setpoint reset. C S V T T Sensors use standard AWG 18 unshielded wire. For cable runs greater than 25 feet, shielded cable is recommended. 1. SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND.
T775U SERIES 2000 CONTROLLER WIRING Controller Wiring See Fig. 11 on page 7 for locating the appropriate power input, remote sensors input, low voltage, contact closure, and load output terminals. WARNING Electrical Shock Hazard. Can cause severe injury, death or property damage. Disconnect power supply before beginning wiring, or making wiring connections, to prevent electrical shock or equipment damage. Access to the terminals can be gained through standard conduit knockouts (A through E in Fig.
WIRING T775U SERIES 2000 CONTROLLER Controller Wiring Details The wiring connection terminals are shown in Fig. 11 and are described in Table 2. See Fig. 12 – Fig. 18 beginning on page 8 for typical T775U wiring applications.
T775U SERIES 2000 CONTROLLER WIRING APPLICATION EXAMPLES WIRING APPLICATION EXAMPLES Fig. 12 – 18 illustrate typical controller wiring for various applications. 1 C–T S+T V NOTE: For a wiring example of three Series 90 Modutrol Motors, refer to the T775A/B/M Series 2000 Electronic Stand-alone Controllers Installation Instructions (form 62-0254).
WIRING APPLICATION EXAMPLES T775U SERIES 2000 CONTROLLER HONEYWELL ELECTRONIC SERIES 90 MODUTROL MOTOR HONEYWELL MODUTROL MOTOR WITH VOLTAGE CONTROL INPUT T1 T2 + – C R F T1 T2 B R W MINIMUM POSITION POTENTIOMETER (Q209) W R SPDT CHANGEOVER (H205 OR H705) B 2 1 POWER OUTPUT MODULATING OUTPUT TERMINAL (MOD 1) 1 1 POWER OUTPUT B R– W+ B R– W+ MODULATING OUTPUT TERMINAL (MOD 1) USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC. M24558A Fig. 16.
T775U SERIES 2000 CONTROLLER CHECKOUT CHECKOUT Inspect all wiring connections at the controller terminals, and verify compliance with the installation wiring diagrams. 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 calibrate for wire loss within the limits of the controller. WARNING Electrical Shock Hazard.
INTERFACE OVERVIEW T775U SERIES 2000 CONTROLLER INTERFACE OVERVIEW Left and Right Arrow Buttons (W and X) 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. Up and Down Arrow Buttons (S and T) The following figure describes the display areas of the LCD and the keypad.
T775U SERIES 2000 CONTROLLER PROGRAMMING OVERVIEW Accessing the Menus Using 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.
1. SETUP T775U SERIES 2000 CONTROLLER Setpoint High Limit may want to use this procedure simply as a reference to locate the particular option or parameter of interest. 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.
T775U SERIES 2000 CONTROLLER SETUP SENSORS # SENSORS 1. SETUP 1.2.1. Number of SENSORS SETUP SENSORS # SENSORS 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. 2 ENTER NUMBER OF SENSORS M24587 Fig. 25. Setup - Sensors - Number of Sensors.
1. SETUP SETUP SENSORS SENSOR A UNITS T775U SERIES 2000 CONTROLLER SETUP SENSORS SENSOR A UNITS 1.2.2.2.2. UNITS (Sensor A only; 0-10V or 4-20mA) 1. From the Sensor A selections, use the S and T buttons to highlight UNITS. 2. Press the X button to display the units list. 3. Use the S and T buttons to highlight the desired value. Default: F (Fahrenheit) 4. Press the X button to accept the units and return to the Sensor A selections. DEG F DEG C PSI IN WC % PA KPA SELECT UNITS FOR SENSOR A M24591 Fig.
T775U SERIES 2000 CONTROLLER SETUP SENSORS SENSOR A CALIBRATE 1. SETUP SETUP SENSORS SENSOR A CALIBRATE 0.0 1.2.2.3. CALIBRATE (Sensor A or B) Ensure that the wire size calibration value is within the limits for the sensor. • For temperature sensors, see “Temperature Sensor Calibration” on page 10. • For other sensors, see “Humidity, Pressure, and Universal Sensor Calibration” on page 10. oF ENTER VALUE TO CALIBRATE SENSOR A M24594 Fig. 32. Setup - Sensors - Sensor A - Calibrate.
1. SETUP T775U SERIES 2000 CONTROLLER SETUP SENSORS 1.2.3. SENSOR B (Temperature only) SETUP SENSORS For two-sensor reset control, Sensor B must always be the controlling temperature. For example, in a reset control based on outside temperature, Sensor B must be the outside sensor. # SENSORS SENSOR A SENSOR B EXIT Sensor B is available only for applications that use Reset, and is a temperature sensor input only. M24597 Fig. 35. Setup - Sensors - Sensor B Menu. 1.
T775U SERIES 2000 CONTROLLER SETUP OUTPUTS MOD 1 TYPE 1. SETUP SETUP OUTPUTS MOD 1 TYPE 1.3.1.1. TYPE (of output signal) 1. From the Mod menu, use the S and T buttons to highlight TYPE. 2. Press the X button to display the Type selections. 3. Use the Sand T buttons to highlight the desired output type. Default: 4-20 mA 4. Press the X button to accept the selected type and return to the Mod menu. 4 - 20 mA 0-10 V 2-10 V SERIES 90 SELECT TYPE FOR MOD 1 M24600 Fig. 38. Setup - Outputs - Mod Out - Type.
1. SETUP SETUP OUTPUTS MOD 1 DERIVATIV T775U SERIES 2000 CONTROLLER SETUP OUTPUTS MOD 1 DERIVATIV 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. 0 SEC ENTER DERIVATIVE TIME FOR MOD 1 M24603 Fig. 41. Setup - Outputs - Mod Out - Derivative.
T775U SERIES 2000 CONTROLLER 1. SETUP 1.3.1.7. Exit Modulating Outputs Setup SETUP OUTPUTS MOD 1 Press the W button (or highlight EXIT and press the X button) to exit the Mod menu and return to the Outputs menu. TYPE MIN OUT % INTEGRAL DERIVATIV SCHEDULE EXIT To configure the second modulating output, go to “1.3.1. Setting up the Modulating Outputs” on page 17. When you finish setting up the two modulating outputs, continue with “1.3.2. NBR OF RELAYS”. M24606 Fig. 44.
1. SETUP SETUP OUTPUTS OPTIONS MIN OFF T775U SERIES 2000 CONTROLLER SETUP OUTPUTS OPTIONS MIN OFF 0 1.3.3.2. MIN OFF (minimum off time for all relays) This is the minimum number of seconds of “off time” for all relays. SEC ENTER MINIMUM OFF TIME FOR RELAYS M24610 Fig. 48. Setup - Outputs - Options - Min Off Time. 1. Press the X button to display the Min Off value. 2. Use the S and T buttons to increase/decrease the desired number of seconds from 0 to 990 seconds in 10 second increments.
T775U SERIES 2000 CONTROLLER SETUP OUTPUTS OPTIONS SHOW RT 1. SETUP SETUP OUTPUTS OPTIONS SHOW RT 1.3.3.4. SHOW RT (show run time hours) 1. Press the X button to display the Show RT values. 2. Use the S and T buttons to select YES or NO. Default: YES 3. Press the X button to accept the value and return to the Options menu. YES NO USE RUNTIME FOR RELAYS Selecting YES shows the RT (run time) hours for each relay on the home screen displays. M24612 Fig. 50. Setup - Outputs - Options - Show Runtime.
1. SETUP T775U SERIES 2000 CONTROLLER SETUP OUTPUTS RELAY 1 RESET SETUP OUTPUTS RELAY 1 RESET 1.3.4.2. RESET IMPORTANT For relays to use the Reset function of the controller, both modulating outputs (MOD 1 and MOD 2) must be set for Reset. YES NO USE RESET FOR RELAY 1 Relays that have Reset set to YES use the reset curve configured for MOD 1. M24616 Fig. 54. Setup - Outputs - Relay - Reset. 1. Press the X button to display the Reset values. 2. Use the S and T buttons to select YES or NO.
T775U SERIES 2000 CONTROLLER 2. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH NO RESET 1.4. Exiting Setup Press the HOME button to exit Setup mode and return to the home screen display. or Use the S and T buttons to highlight EXIT from the menu and press the X button. SETUP SENSORS OUTPUTS EXIT This completes the Setup procedure. M24619 Fig. 57. Setup Exit. 2. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH NO RESET The T775U can be programmed for Reset or No Reset.
2. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH NO RESET PROGRAM MOD 1 SETPOINT MENU PROGRAM MOD 1 SETPOINT 70 T775U SERIES 2000 CONTROLLER 2.1.2. SETPOINT 1. From the menu, use the S and T buttons to highlight SETPOINT. 2. Press the X button to display the setpoint value. 3. Use the S and T buttons to increase/decrease the desired setpoint temperature. Default: 70°F (21°C) Range: -40°F to 248°F (-40°C to 120°C) 4. Press the X button to accept the setpoint temperature and display the next option.
T775U SERIES 2000 CONTROLLER PROGRAM MOD 1 SETBACK 2. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH NO RESET MENU PROGRAM MOD 1 SETBACK 60 ENTER SETBACK SETPOINT FOR MOD 1 Fig. 63. Program - Setback. 2.1.5. SETBACK The Setback temperature option displays only if scheduling is enabled (see Fig. 47 on page 20) or the DI Option is set to Setback. (see Fig. 49 on page 21). This is the desired setpoint temperature that you want to use during setback mode for this output.
3. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH RESET 3. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH RESET The T775U can be programmed for Reset or No Reset for each output. From the factory, the T775U is programmed for No Reset. This section describes the steps necessary to program the controller for Reset. To use the Reset feature, the first output (MOD 1) must be set to Reset=YES in Setup mode (see “3.1. Setting Up the Controller for Reset”).
T775U SERIES 2000 CONTROLLER PROGRAM MOD 1 3. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH RESET MOD 1 RESET: YES-OTHER AND DI OPTION = SETBACK MOD 1 RESET: YES-BOILER AND DI OPTION = SETBACK MENU PROGRAM MOD 1 MENU PROGRAM MOD 1 SP MAX A1 RESET B1 SP MIN A2 RESET B2 THROT RNG ACTION SETBACK EXIT OR 3.2. Program Menus for Outputs with Reset Press the MENU button, select PROGRAM, then highlight MOD 1 and press the X button to view the parameters. The Reset curve settings (Fig. 67 through Fig.
3. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH RESET PROGRAM MOD 1 RESET B2 MENU PROGRAM MOD 1 RESET B2 70 T775U SERIES 2000 CONTROLLER 3.2.4. RESET B2 or OUTSD MAX (Sensor B value when at MIN A2 Setpoint) oF ENTER SENSOR B VALUE FOR MINIMUM SETPOINT M24575 1. From the menu, use the S and T buttons to highlight RESET B2. 2. Press the X button to display the setpoint value. 3. Use the S and T buttons to increase/decrease the desired setpoint temperature.
T775U SERIES 2000 CONTROLLER 3. PROGRAMMING OUTPUTS (MOD AND RELAY) WITH RESET MENU PROGRAM RELAY 1 SETBACK PROGRAM RELAY 1 SETBACK -10 3.2.7. SETBACK OFFSET (if configured) The Setback temperature option displays only if scheduling is enabled (see Fig. 47 on page 20) or the DI Option is set to Setback. (see Fig. 49 on page 21). This value is the number of degrees plus (+) or minus (-) that you want the temperature to be offset from the setpoint. oF ENTER SETBACK SETPOINT FOR RELAY 1 M24579 Fig.
4. SCHEDULING T775U SERIES 2000 CONTROLLER 4. SCHEDULING Scheduling provides the ability to set daily temperature settings for up to two events per day. Typically, these are the daytime (setpoint) and the nighttime (setback) settings. IMPORTANT To enable Scheduling, you must first enter Setup mode (press and hold the MENU button for 5 seconds), select OUTPUTS, select OPTIONS, select USE SCHED, and then select YES. (see “1.3.3.1. USE SCHED” on page 20).
T775U SERIES 2000 CONTROLLER MAIN SCHEDULE OPTIONS SET TIME 4. SCHEDULING MAIN SCHEDULE OPTIONS SET TIME 4.2.1. SET TIME Setting the system time is required to enable the controller to follow daylight saving time. IMPORTANT Set the Date before setting the Time. See “4.2.2. SET DATE”. 08:12 AM SET SYSTEM TIME M24622 Fig. 78. Schedule - Options - System Time. MAIN SCHEDULE OPTIONS SET DATE MAIN SCHEDULE OPTIONS SET DATE 4.2.2.
4. SCHEDULING MENU SCHEDULE MON-FRI T775U SERIES 2000 CONTROLLER 4.3. Setting Individual Schedules MENU SCHEDULE MON-FRI As shown in the Schedule menu (Fig. 76 on page 31), schedules can be set for the following time periods: • Monday through Friday • Saturday and Sunday • Individual days of the week E1 SETPT E1 TIME E2 SETPT E2 TIME EXIT 1. From the Schedule menu, use the S and T buttons to highlight the desired time period. 2.
T775U SERIES 2000 CONTROLLER MAIN SCHEDULE MON-FRI E1 TIME 4. SCHEDULING MAIN SCHEDULE MON-FRI E1 TIME 4.3.2. E1 TIME (time for event 1) 6:00 AM SET TIME FOR EVENT 1 M24627 1. From the selected time period menu, use the S and T buttons to highlight E1 TIME. 2. Press the X button to display the current time setting for event 1. 3. Use the X button to cycle between the hour, minute, and AM/PM values. 4. Use the S and T buttons to increase/decrease the desired value for the hour, minute, and AM/PM. 5.
SUMMARY MENU T775U SERIES 2000 CONTROLLER SUMMARY MENU Error Message The Summary menu provides the ability to view the schedule (E1 and E2 times) for each relay for each day of the week. EE NOTE: Scheduling must be enabled for the Summary menu to display. Enabling the schedule is determined in the Setup process for the Output Options (see page 20).
DOC T775U SERIES 2000 CONTROLLER CO2 PPM to Percent (%) Conversion DoC If a CO2 sensor is used, cut out Table 6 and leave with the installed T775U. The T775U can display the sensor output as a percentage (%). Use this table to convert from a percentage to PPM. Emissions Compliance NOTE: The example in Table 6 applies when the CO2 sensor is set for 0-2,000 PPM (full range).
