Honeywell Thermostat T775A User's Manual
Contents
1. Table 3 Default Programming Values Setpoint F Differential F Operating Mode Stage 1 72 2 Heat Stage 2 70 2 Heat Stage 3 68 2 Heat Stage 4 66 2 Heat 1 Forthe T775B and D assign the loads to the appropriate sensor by setting the DIP switch in the upper right corner of the T775 see DIP Switch Selection Fig 9 2 Before programming the T775 verify that the F C selection jumper is properly installed The T775 ships from the factory with the jumper in the F position If C is desired remove the jumper 3 Apply power to the device The device begins counting down from 210 This countdown sequence lasts for approximately 3 1 2 minutes NOTE f upon removing the jumper plug the device does not display a Remove power from the device b Replace power to the device 4 Press Select to override the time delay 5 Press Select and Enter keys simultaneously to begin programming the load operating mode Heat or Cool 6 Press the Set down arrow to change to cooling The Set up arrow changes back to heating 7 Press Enter to program mode displayed into memory T775A B C D REMOTE TEMPERATURE CONTROLLER Press Select to go to the next stage Repeat steps 6 through 9 for additional stages Press Select after setting the last stage to return to the display of the sensed temperature Programming Stage Control Values 1 2 3 4 10 Press Select2. 3 and 4 by the same number of degrees and in the same direction 2 The control rejects any change to the stage 1 setpoint if it results in exceeding control limits 40 to 220 F 40 to 104 C for subsequent stages This allows easy sequential output staging modifications while keeping the margin intact between setpoints 63 2489 2 T775A B C D REMOTE TEMPERATURE CONTROLLER CHECKOUT Error Messages There are seven error messages that can display in response to T775 software or hardware problems The error Codes that can flash on the display are SF Sensor Failure flashing SF indicates an out of range or defective sensor Make sure that the sensors are connected properly For T775A C all loads de energize when this error message flashes For the T775B D the loads controlled by the out of range sensor de energize The display flashes SF to indicate which sensor is defective or in error In the event that only one sensor is defective the remaining sensor and its load s operate normally Only the load s controlled by the defective out of range or unconnected sensor de energize NOTE Sensor values below 40 or above 220 F are out of range EF EEPROM Failure The values read back from the EEPROM are not the same as written into the EEPROM This error cannot be field repaired Replace the device The EEPROM is not intended to be field repaired CF Calibration Failure A calibration
3. controller is installed and wired apply power Make initial adjustments and desired settings 1 Asshown in Fig 10 record the sensed temperatures for both Sensor A and Sensor B as displayed on the device Use the Select key to advance through the programming loop to determine and then write on the Checkout Table Fig 10 the loads controlled by each sensor 2 Write the operating mode heat or cool for each stage in the Checkout Table Fig 10 3 Write the sensed temperature for each load on the Sensed Temp line 4 Write the differential for each load on the Differential line 5 Write the setpoint for each stage Off temperature Cal culate the On Temperature for each stage NOTE On temperature is setpoint plus differential for cooling and it is setpoint minus differential for heating 6 Plotthe on and off open closed values at which the device will energize and de energize each output load Refer to the Device Programming Worksheet 7 Verify which loads are energized by using the Checkout Table Fig 10 As shown in the example the display indicates in the lower right corner energized stages If no stages are energized the words stage energized will not appear NOTE Ifthe sensed temperature is between the On and Off temperatures the load may either be energized or de energized Refer to the Control Algorithm section in Operation for further explanation 8 If an error message flashes refer to th
4. resistor reading was not within the range of the Analog to Digital converter This error cannot be field repaired Replace the device OF Stray Interrupt Failure Anunused interrupt occurred This error cannot be field repaired Replace the device CE Configuration Error The device hardware was configured to a nonexistent device This error cannot be field repaired Replace the device OE ROM Error The internal Read Only Memory ROM of the micro processor is defective This error cannot be field repaired Replace the device AE RAM error The internal Random Access Memory RAM of the microprocessor is defective This error cannot be field repaired Replace the device Setpoint Calibration To maintain temperature accuracy use 18 AWG two conductor sensor wires If the length of the sensor wire exceeds 400 feet recalibration will be necessary to maintain accuracy Table 4 shows the corresponding temperature offset to use for different 63 2489 2 10 sensor wire lengths This temperature offset should be added to the desired temperature setpoint for these applications Refer to programming instructions in the Programming section for entering temperature setpoints Table 4 Temperature Offset Based on Wire Length Sensor Wire Length Calibration Offset 0 to 399 ft None required 400 to 599 ft 1 0 degrees 600 to 799 ft 2 0 degrees 800 to 1000 ft 3 0 degrees After the
5. setpoint minus the differential For example Load 1 Compressor 1 cool Sensor A Setpt 1 78 F On at 82 F Diff 1 4 F Off at 78 F N CAUTION The T775 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 energizing The number 1 2 3 4 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 5 Remove the T775 cover and enter the values listed on the worksheet and the date in the first column on the label inside the T775 cover Keypad Programming and Display The T775 utilizes a Liquid Crystal Display LCD for interactive prompting during programming and display of sensed and assigned setpoint and differential values User programming of the T775 is accomplished through the four programming keys 63 2489 2 8 Programming Keys The four programming keys are Select Up and Down arrows and Enter Select Sequentially prompts the user about what parameter is being displayed After the last parameter value is viewed pressing the Select key again displays the control values from the beginning of the display loop The parameters are setpoint differential stage energized hea
6. to display the current stage setpoint Press Set up arrow to increase or Set down arrow to decrease to the desired setpoint Press Enter to place the displayed value into memory Press Select to display the current stage switching differential Press Set up arrow to increase or Set down arrow to decrease the switching differential Press Enter to place the displayed value into memory Repeat steps 1 through 6 to program an additional stage To return to stage 1 parameters a T775A C Press Select two times b T775B D Press Select four times Scroll through the programming loop a second time to confirm that the appropriate values were entered into memory by pressing Select For the T775A C skip to step 12 NOTE The T775B and D have three display options for the sensed temperature 1 Sensor A only 2 Sensor B only 3 Alternating between Sensor A and Sensor B at approximately five second intervals 11 To change the T775B D display option a Sensor A only Press Select after viewing the final stage switching differential b Sensor B only Press Select a second time c Alternate between A and B Press Select a third time 12 Before replacing the cover on the T775 check to see that the control values were recorded on the label on the backside of the cover IMPORTANT 1 Forthe T775A and C only After initial programming altering the setpoints for stage 1 up or down results in a change in setpoints 2
7. 20v Qo 240ov o RELAY 1 ENERGIZED SETPOINT 2 DIFFERENTIAL 2 RELAY 1 AND 2 ENERGIZED TEMPERATURE RISE A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A FOR T775B D CONNECT SENSOR B TO PINS 7 AND 8 A DIP SWITCHES FOR SENSOR SELECTION PRESENT OF T775B D ONLY MR Fig 11 Two stage control 24 Vac input 24 Vac load 63 2489 2 12 T775A B C D REMOTE TEMPERATURE CONTROLLER 120 VAC INPUT 120 VAC LOADS SELECT r SETA SENSOR A OUTPUT 1 COOL MODE TEMPERATURE FALL Y DIFFERENTIAL 2 i RELAY 1 AND 2 ENERGIZED SETPOINT2 240 VAC INPUT 240 VAC LOADS RELAY 1 ENERGIZED DIFFERENTIAL 1 t 4 TEMPERATURE SETPOINT 1 RISE SELECT r SET TEMPERATURE FALL HEAT MODE NULL SETPOINT 1 f DIFFERENTIAL 1 SENSOR A RELAY 1 ENERGIZED SETPOINT 2 f DIFFERENTIAL 2 RELAY 1 AND 2 ENERGIZED OUTPUT 1 TEMPERATURE RISE RED 240 VAC A BLK A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A FOR T775B D CONNECT SENSOR B TO PINS 7 AND 8 A DIP SWITCHES FOR SENSOR SELECTION PRESENT OF T775B D ONLY M7422A Fig 12 Two stage control 120 or 240 Vac input 120 or 240 Vac load 13 63 2489 2 T775A B C D REMOTE TEMPERATURE CONTROLLER 120 VAC INPUT 120 VAC LOADS SELECT ENTER r SET A TEMPERATURE FALL OUTPUT 1 DIFFERENTIAL 3 SETPOINT 3 DIFFERENTIAL 2 SETPOINT 2 DIFFEREN
8. 5A B C D REMOTE TEMPERATURE CONTROLLER LCD TEMPERATURE C F Fic SELECTION DISPLAY L l DIP SWITCHES FOR PROGRAMMING Ea SENSOR SELECTION KEYS CE gt 775 SELECT SETS ENTER ONLY SA SB SENSOR INPUT MOUNTING HOLE TOD AND 24VAC O 6 LOCATION TERMINALS 1 8808800l06 HOLEA OUTPUT 2 OUTPUT 1 LINE VOLTAGE e nc 120v Qo INPUTS com Qo eQ com cow Qe 240v KNOCKOUT B NO 44 KNOCKOUT C o2 COM o NC RELAY OUTPUT STAGES NOTE T775A TERMINAL BLOCK CONTAINS ONLY MAXIMUM OF FOUR STAGES TERMINALS 1 6 AND HAS NO DIP SWITCHES FOR SENSOR SELECTION M7423 Fig 3 Feature locations for T775A B LCD TEMPERATURE C F F C SELECTION DISPLAY Nus oe L dc ae DIP SWITCHES FOR m PROGRAMMING WI SENSOR SELECTION KEYS ch 2 PRESENT ON T775D ENTER ONLY SENSOR INPUT SB 24 TERMINALS PSI 388438133 HOLE A Serre re 7p SENSOR TOD 24V SENSOR MOUNTING HOLES EARTH GROUND WIRE OUTPUT 2 OUTPUT 1 nc Qo e nc 120v Qo com Qo o com cow Qe oQ No 240vQo HOLE B oQ NO oo uu LINE VOLTAGE eo INPUTS OUTPUT 4 HOLE C RELAY OUTPUT STAGES NOTE 775 TERMINAL BLOCK CONTAINS ONLY TERMINALS 1 6 AND HAS NO DIP SWITCHES FOR SENSOR SELECTION M7427 Fig 4 Feature locations for T775C D 63 2489 2 4 INSTALLATION When Installing this Product 1 Read thes
9. D REMOTE TEMPERATURE CONTROLLER T7047C1090 WALLMOUNT SENSOR CASE OPTIONAL DI LEADWIRES TO T775 my 193987GA SENSOR SCREW TERMINAL S do o m SCREW TERMINAL s CAUTION POSITION SENSOR AWAY FROM SCREW TERMINALS wgi09C Fig 7 Sensor mounted on wall SENSORS I TO T775 CONNECTIONS 1 AND 2 SENSOR A OR 7 AND 8 SENSOR B MIA Fig 8 Parallel series wiring of sensors 63 2489 2 WIRING N CAUTION Electrical Shock or Equipment Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installation N CAUTION Do not use 24 Vac power at terminals 5 and 6 to power any external loads if 120 Vac or 240 Vac is used to power the T775 IMPORTANT The T775 is an operating control not a limit or safety control If used in applications requiring safety or limit controls use a separate safety or limit control device in conjunction with the T775 Refer to Fig 3 or 4 for locating the appropriate power inputs remote sensor input load output terminals contact closure input and sensor selection switch Access to the terminals can be gained through standard conduit knockouts A through C located around the perimeter of the enclosure NOTE Hole A should only be used for sensor low voltage and contact closure wiring When wiring the input power only one source of power can be applied to the T775 for example 24 Vac or 120 Vac
10. Japan Mexico Netherlands Spain Taiwan United Kingdom U S A 63 2489 2 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 Approvals Underwriters Laboratories Inc Listed File no E4436 Canadian Standards Assoc certified File no LR47125 Accessories T775A B A775A1003 Temperature Sensor Simulator C7100C Duct Mount Averaging Sensor 198212CA Water Resistant Sensor 203401B Water Tight Sensor T7047C1090 Wall Mounted Sensor Case 107324A Bulb Holder duct insertion 121371A Copper Immersion Well 121371E Stainless Steel Well 107048 Heat Conduction Compound 4 ounce C7043A1098 Case and Immersion Well for running conduit to sensor T775C D 121371A Copper Immersion Well 121371E Stainless Steel Well 107408 Heat Conduction Compound 4 ounce C7043A1098 Case and Immersion Well for running conduit to sensor lt 6 153 __ gt lt P 5 1 4 133 gt MOUNTING HOLES T775A B C D REMOTE TEMPERATURE CONTROLLER SELECT r SETA ENTER OOV 1 1 4 4 3 13 16 97 32 4 3 4 121 7 8 22 DIAMETER a 2 3 8 60 M344C Fig 1 Approximate dimensions of T775A B in in mm r 3 1 2 89 718 22 DIAMETER M1301B 34 Fig 2 Approximate dimensions of T775C D in in mm 63 2489 2 T77
11. NNECT SENSOR B TO PINS 7 AND 8 AN DIP SWITCHES FOR SENSOR SELECTION PRESENT OF T775B D ONLY M7425A Fig 14 Four stage control 24 Vac input 24 Vac load 15 63 2489 2 Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limit e 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 customer honeywell com U S Registered Trademark Printed in U S A led 2005 Honeywell International Inc RE paper containing at least 1096 63 2489 2 B B Rev 07 05 post consumer paper fibers Honeywell
12. T775A B C D Honeywell Remote Temperature Controller 775 T775AB _ APPLICATION The T775 family of Electronic Remote Temperature Controllers provide on off temperature control for ducts tanks chillers heating and refrigeration units and other applications where electronic accuracy in addition to remote sensing is desired In addition certain models of the T775 family of controllers provide on off temperature control of heating cooling and ventilating systems in agricultural confinement buildings storage areas and heavy industrial applications IMPORTANT The T775 is an operating control not a limit or safety control If used in applications requiring safety or limit controls a separate safety or limit control device should be used in conjunction with the T775 PRODUCT DATA FEATURES T775A models provide staged on off control with one temperature input and one to four relay output stages T775B models provide staged on off control with two temperature inputs and two to four relay output stages T775C models provide staged on off control with one temperature input and four relay output stages T775D models provide staged on off control with two temperature inputs and four relay output stages T775C D models meet National Electrical Code Article 547 requirements for animal confinement buildings Setpoint temperature range is 40 to 220 F 40 to 104 C Ambient temperatu
13. TIAL 1 SETPOINT 1 TEMPERATURE FALL SELECT r SETA A POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A FOR T775B D CONNECT SENSOR B TO PINS 7 AND 8 A DIP SWITCHES FOR SENSOR SELECTION PRESENT OF T775B D ONLY COOL MODE RELAY 1 2 3 AND 4 ENERGIZED RELAY 1 2 AND 3 ENERGIZED RELAY 1 AND 2 ENERGIZED RELAY 1 ENERGIZED TEMPERATURE RISE HEAT MODE NULL SETPOINT 1 RELAY 1 ENERGIZED SETPOINT 2 i DIFFERENTIAL 2 RELAY 1 AND 2 ENERGIZED RELAY 1 2 AND 3 ENERGIZED RELAY 1 2 3 AND 4 ENERGIZ TEMPERATURE RISE M7424A Fig 13 Four stage control 120 or 240 Vac input 120 or 240 Vac load 63 2489 2 14 T775A B C D REMOTE TEMPERATURE CONTROLLER OUTPUT 4 COOL MODE HEAT MODE TEMPERATURE RELAY 1 2 AND 3 NULL ENERGIZED TEMPERATURE FALL SETPOINT 1 RELAY 1 ENERGIZED SETPOINT 3 RELAY 1 AND 2 SETPOINT 2 ENERGIZED porn i DIFFERENTIAL 2 DIFFERENTIAL2 em JpLm L SETPOINT 2 RELAY 1 AND 2 RELAY 1 ENERGIZED ENERGIZED TEMPERATURE RELAY 1 2 AND 3 RISE ENERGIZED TEMPERATURE RISE DIFFERENTIAL 1 SETPOINT 1 NOTE FOR THERMOSTAT APPLICATIONS CONNECT CONTACT NO OF COOLING STAGE TO Y1 AND SECOND STAGE TO Y2 CONNECT CONTACT NO OF HEATING STAGE TO W1 AND SECOND STAGE TO W2 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED A FOR T775B D CO
14. Y SIDE VIEW SENSOR B WHEN SWITCH IS DEPRESSED ON THE RIGHT AS SHOWN M3292 Fig 9 DIP switch settings for sensor selection Device Setup 1 Determine loads to be controlled and the operating mode heat or cool and enter them in the Device Programming Worksheet Table 2 Table 2 Device Programming Worksheet Load 1 SetPt 1 On at Diff 1 Off at Load 2 SetPt 2 On at Diff 2 Off at Load 3 SetPt 3 On at Diff 3 Off at Load 4 SetPt 4 On at Diff 4 Off at 63 2489 2 T775A B C D REMOTE TEMPERATURE CONTROLLER For example Load 1 Compressor 1 cool Setpt 1 On at Diff 1 Off at 2 Fortwo sensor models T775B determine which loads will be controlled from sensor A or sensor B and enter on the worksheet For example Load 1 Compressor 1 cool Sensor A Setpt 1 On at Diff 1 Off at 3 Determine setpoint Setpt and switching differential Diff for each load and enter on the worksheet For example Load 1 Compressor 1 cool Sensor A Setpt 1 78 F On at Diff 1 4 F Off at 4 Refer to the Control Algorithm subsection of Operation section to calculate the load on and off temperatures Enter them on the worksheet NOTE Remember that the on off outputs are off at setpoint in both heating and cooling operating modes When in cooling mode the load turns off at setpoint plus the differential When in heating mode the load turns on at
15. acts W7505 or S7005 for example When this override is active The display shows the number of stages that would be energized The words STAGE ENERGIZED flash on the display Energized stages de energize until the override returns to inactive Off T775A B C D REMOTE TEMPERATURE CONTROLLER FI C Selection A single jumper plug controls F C indication of the displayed temperature value See Fig 3 and 4 for the location of this jumper The unit ships with the jumper installed in the F mode To operate the device in the C mode remove the jumper Replacing the jumper reinstates the F mode NOTES If upon removing the jumper plug the device does not display C Remove power from the device Replace power to the device DIP Switch Selections On the T775B D DIP switches are provided for assignment of each relay output stage to its operating sensor If an individual Switch is depressed to the right toward its corresponding load number 1 through 4 on DIP switch Sensor B is the controlling sensor for that output stage If an individual switch is depressed to the left Sensor A is the controlling sensor for the output stage An example of the switches and their corresponding positioning is shown in Fig 9 SENSORA SENSORB SWITCH 1 4 A LOAD 1 PWB LOAD 2 SWITCH LOAD 1 IS CONTROLLED BY SENSOR A WHEN SWITCH IS A DEPRESSED ON THE LEFT PWB A B LOAD 2 IS CONTROLLED B
16. e description of these messages If SF flashes a Check sensor connections b If properly connected and SF continues to flash check the sensor location to make sure it is located in an ambient condition that is within the sensor capability 40 to 220 F If an error message other than SF flashes the device cannot be field repaired Replace the device T775A B C D REMOTE TEMPERATURE CONTROLLER CHECKOUT EXAMPLE WITH SENSOR A 68 AND SENSOR B 73 LOAD 1 LOAD 2 LOAD 3 LOAD 4 HEAT OR COOL HEAT HEAT HEAT HEAT MODE DIFFERENTIAL DESIGNATED SENSOR SETPOINT 68 SENSED TEMPERATURE 68 STAGE ENERGIZED 1 34 SELECT m SET ENTER C Gv2CAJC NOTE RELAYS ARE DE ENERGIZED AT SET POINT CHECKOUT TABLE LOAD 1 LOAD 2 LOAD 3 LOAD 4 HEAT OR COOL MODE DIFFERENTIAL DESIGNATED SENSOR SETPOINT SENSED TEMPERATURE woicates LOAD STATUS WHEN SENSED TEMPERATURE REACHES SETPOINT AA iNDICATES LOAD STATUS WHEN SENSED TEMPERATURE REACHES SETPOINT MINUS DIFFERENTIAL HEAT MODE NAJA Fig 10 Checkout Table and checkout example with Sensor A 68 F and Sensor B 73 F 11 63 2489 2 T775A B C D REMOTE TEMPERATURE CONTROLLER COOL MODE TEMPERATURE FALL E RELAY 1 AND 2 ENERGIZED SELECT r SET3 DIFFERENTIAL t 2 SETPOINT 2 RELAY 1 ENERGIZED es dl 1 ene P TEMPERATURE HOT SETPOINT 1 RISE HEAT MODE TEMPERATURE FALL NULL SETPOINT 1 OUTPUT 1 b DIFFERENTIAL 1 1
17. e instructions carefully Failure to follow them could damage the product or cause a hazardous condition 2 Checkratings given in instructions and on the product to ensure the product is suitable for your application 3 Installer must be a trained experienced service technician 4 After installation is complete check out product operation as provided in these instructions N CAUTION Electrical Shock or Equipment Damage Hazard Can shock individuals or short equipment circuitry Disconnect power supply before installation Location and Mounting Mount the controller on any convenient interior location using the two mounting holes provided on the back of the metal enclosure mounting screws are not provided and must be obtained separately Use controller dimensions in Fig 1 T775A B or Fig 2 T775C D as a guide Sensor Location The 193987GA Sensor can be located up to 1000 feet 304m from the T775 using standard AWG 18 2 unshielded wire For cable runs greater than 25 feet shielded cable is recommended See Fig 5 It may be located on pipes in an immersion well in a wall mounted case or on a bulb holder See Fig 7 The 193987GA is not a water tight or water resistant sensor For wet applications see the Accessories list in the Specifications section Multiple sensors can be parallel series wired to sense average temperatures in large spaces To maintain control accuracy the number of sensors parallel series wi
18. ermined by programming keys Heating Mode Operation Relay outputs energize at the temperature setpoint minus the differential value Relay outputs de energize at the temperature setpoint value Cooling Mode Operation Relay outputs energize at the temperature setpoint plus differential value Relay outputs de energize at the temperature setpoint value EXAMPLE Using a device with one input and one relay output the corresponding load energizes at the following temperatures based on the initial settings Setpoint 68 F Differential 2 F Outputs Energized Heating Mode Stage One energizes at 66 F Cooling Mode Stage One energizes at 70 F The T775B D have dual sensor inputs and allow two separate controllers to exist within one enclosure Selection of the stage parameters operation mode setpoints and differentials is the same as for a single sensor device after each stage is assigned its operating sensor This assignment is hardware driven via a four position DIP switch An explanation of the DIP switch assignments appears in Fig 9 See Fig 3 and 4 for the DIP switch location Contact Closure Override Input The two terminal input allows the user to override a relay energized condition on all outputs This is done using contact closure between terminal pins 3 and 4 TOD See Fig 3 and 4 for location This can be achieved manually or by using an EMS controller or time clock with normally open cont
19. nic accuracy and remote sensing are desired The T775C D Electronic Remote Temperature Controllers provide staged on off temperature control of heating cooling and ventilating systems in agricultural confinement buildings storage areas and heavy industrial applications Dimensions See Fig 1 and 2 Mounting Mounts on any suitable horizontal or vertical surface see Fig 3 and 4 for mounting hole locations Temperature Accuracy 1 F at nominal voltage in 77 F 25 ambient nominal sensor value Accuracy may vary based on deviation from nominal values of input voltage operating ambient and sensor ambient Setpoint Adjustment Range 40 to 220 F 40 to 104 C 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 Operating Ambient Temperature One and Two Stage units 30 to 140 F Three and Four Stage units 30 to 125 F Operating Humidity 5 to 95 relative humidity rh noncondensing Sensor Positive coefficient platinum type 4 8 ohms F 1000 ft maximum distance between sensor and solid state controller requires calibration over 400 ft To maintain NEMA 4X rating use environmental proof cable and sensor Electrical Ratings Voltage Input 24 120 240 Vac 50 60 Hz 10 15 Power Consumption For one and two stage units 8 VA maximum at 60 Hz 10 VA maximum at 50 Hz For three and f
20. o protect compressors in the event of a power failure NOTE To avoid viewing the entire countdown press the Select key The LCD display now shows what it normally reads load sensed temperature stages energized and for two sensor devices the sensor Sensor A or Sensor B being read NOTE At any time during programming a 60 second pause between key presses reverts the display to indicate the sensed temperature and stage status For two sensor applications the user has three options for display of sensed temperature The display can be configured to lock onto continuous Sensor A lock onto continuous Sensor B sensed temperature alternate between Sensor A and Sensor B at approximate five second intervals This selection is accomplished in the Select screen scrolling loop 1 2 3 To lock on to either sensor use the Select key to scroll through the loop to the temperature prompt of interest Stop at Sensor A or Sensor B sensed temperature point When the loop is stopped at any other prompt the dis play alternates between Sensor A and Sensor B sensed temperatures NOTE Pressing the Select key at the end of the pro gramming sequence configures the display for alternating temperature display Device Programming Default Values When power is initially applied to the T775 the control points will be at their default value set at the factory See Table 3 for default values
21. or 240 Vac Knockouts B and C can be used to gain access to 120 Vac or 240 Vac input terminals and the load relay output terminals See Fig 11 through 14 for typical T775 wiring and applications IMPORTANT Poor wiring practices can cause erratic temperature readings from the 193987GA Sensor Avoid the following to ensure proper operation Do not route the temperature sensor wiring with building power wiring Do not locate the temperature sensor wiring next to control contactors Do not locate the temperature sensor wiring near electrical motors Do not locate the temperature sensor wiring near welding equipment Make sure good mechanical connections are made to both the sensor and the controller Do not mount the sensor with the leadwire end wire end pointing up in an area where condensation can If any of the above conditions cannot be avoided use shielded cable NOTE Ground the cable shield at the T775 connection only not at the sensor connection see Fig 5 OPERATION Control Algorithm On Off Control The T775AC operate with one temperature input supplied by the remote sensor while T775B D have two temperature inputs The T775A B C D are all capable of providing up to four stages of on off control relay outputs Each controller stage has its own independent setpoint that can be configured to operate in either the heating or cooling mode The mode of operation for each stage is user det
22. our stage units 13 VA maximum at 60 Hz 20 VA maximum at 50 Hz Table 1 T775 Models Relay Maximum Operating Model Inputs Outputs Ambient Temperature Comments T775A1001 1 1 140 F 60 Includes one 193987GA Sensor T775A1019 1 2 140 F 60 T775A1027 1 3 125 52 T775A1035 1 4 125 52 1777581000 2 2 140 60 1939876 Sensors T775B1018 2 3 125 52 775 1026 2 4 125 52 775 1 4 125 52 NEMA 4 enclosure Includes one 203401B Remote Sensor T775D 2 4 125 F 52 NEMA 4X enclosure Includes two 203401B Remote Sensors 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 If you have additional questions need further information or would like to comment on our products or services please write or phone 1 Your local Honeywell Automation and Control Products Sales Office check white pages of your phone directory 2 Honeywell Customer Care 1885 Douglas Drive North Minneapolis Minnesota 55422 4386 In Canada Honeywell Limited Honeywell Limit e 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
23. re range is 30 to 140 F for one and two stage models and 30 to 125 F for three and four stage models Linear platinum temperature sensor with T775A B Water tight linear platinum temperature sensor with T775C D Adjustable temperature range and differential LCD indication for mode and output status Keypad provides ease of programming and operation Accuracy is within 1 F at nominal operating ambient temperature of 77 F and voltage input Stage s independently programmed for heating or cooling 24 120 240 Vac input voltage Spdtrelay outputs Contents Application eee enne 1 Ia it 1 SPSCIICALIONS e S 2 Ordering Information uuu 2 Iac E E E A 5 6 hrec 10 63 2489 2 T775A B C D REMOTE TEMPERATURE CONTROLLER SPECIFICATIONS IMPORTANT Specifications given in this publication do not include normal manufacturing tolerances Therefore an individual unit may not exactly match the listed specifications Also this product is tested and calibrated under closely controlled conditions and some minor difference in performance can be expected if those conditions are changed Models see Table 1 The T775A B Electronic Temperature Controllers provide staged on off temperature control for ducts tanks chillers heating and refrigeration units and other applications where electro
24. red must be of the n2 power for example 4 9 16 etc See Fig 8 Sensor Mounting Sensors can be mounted on a wall or panel for sensing space temperature Fig 7 strapped to a pipe or inserted in a well Fig 6 for hot cold water sensing or taped 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 the lead wires exiting the bottom of the sensor T775A B C D REMOTE TEMPERATURE CONTROLLER T775 SELECT r SETA GROUND SHIELD TO T775 CABLE OR TO GROUNDING SCREW SHIELDED CABLE OUTPUT 2 OUTPUT 1 oQ Nc 120 0 com Qo eQ com com Qe no Qo o No 240V Go NO Qo o 2 NO com Qo o COM NC Qo o 2 NC SHIELDED CABLE OUTPUT 3 OUTPUT 4 GROUNDING ERE NOTE DO NOT GROUND SHIELDED CABLE AT SENSOR END SENSOR NOTE TO MINIMIZE NOISE PICKUP MAKE CONNECTION FROM SHIELDED CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY M7430 Fig 5 Using shielded cable cable runs longer than 25 ft NOTE Use heat conductive compound in immersion wells See Accessories in the Specifications section N CAUTION Electrical Shock Hazard Can short equipment circuitry Make sure that metal tube of sensor does not short against T terminals in wall mounted case COVER SENSOR LEADS WITH HEAT CONDUCTIVE db WELL M5249 Fig 6 Sensor inserted in immersion well 63 2489 2 T775A B C
25. t or cool operation mode 1 2 3 4 indicating assigned stage Up and Down Allow the displayed parameter to be increased or decreased After pressing Select a control value can be changed using these keys Control values increase or decrease by 1 F or 1 C each time an arrow key is pressed Enter Places the new value in the microprocessor memory IMPORTANT Control values operations are not placed in the micro processor memory until the Enter key is pressed Press the Select and Enter keys at the same time to change the control algorithm from heating to cooling or from cooling to heating Heating and cooling parameters are not displayed during normal Select key sequences The only parameters displayed after pressing the Select and Enter keys at the same time are the stage indication and the word heat or cool To change the operation from heating to cooling or vice versa for a desired output stage use the arrow keys The next stage of heat or cool assignment appears after pressing the Select key When all stages are programmed the display reverts to sensed temperature and load energized status NOTE Control values and operation selection remain in the device memory even after the power is removed Display Once power is applied or restored to the device the display counts down from 210 until the display reads zero During this time all previously energized outputs de energize This is intended t
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