Honeywell T775J Product Data Download Page 19

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T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER

63-2248—4

Table 3. Checkout Table.

Checkout Table

Checkout Table Example

Heat or

Cool

Load 1

Load 2

Reset
Value

Load 1

Reset
Value

Load 2

Heat or

Cool

Load 1

Heat

Load 2

Heat

Reset
Value

Load 1

Reset
Value

Load 2

Sensor
A ____
Sensor
B ____

Sensed
Temp

Sensor A

80°

Sensor B

10°

Sensed

Temp

80° Off

76° On

80°

78° Off

74° On

120° Off
116° On

80°

118° Off

80°

Setpoint B ____________

Reset Direction __________

Setpoint B

Reset Direction

Increase

Sensor B _____________

Reset Action ____________

Sensor B

Reset Action

Below

Reset Ratio A _________

Reset Ratio B ___________

Reset Ratio A

Reset Ratio B

FORMULA 1:

FORMULA 1 EXAMPLE:

Sensor B

Sensor B = 10

-Setpoint B

Setpoint B = 30

Temp Diff = _______________________

Temp Diff =

-20

FORMULA 2:

FORMULA 2 EXAMPLE:

Amount of Reset = Reset Ratio B

Amount of Reset =

2 x (-20) = -40

Reset Ratio A

Summary of Contents for T775J

Page 1: ...ng 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 safe...

Page 2: ...40 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 s...

Page 3: ...3 16 97 4 3 4 121 8 1 2 216 5 7 32 134 1 1 4 32 1 1 4 32 2 3 8 60 7 8 22 DIAMETER 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 ...

Page 4: ...rd 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 The T77...

Page 5: ...r to the T775 when an electrically noisy environment exists See Fig 6 SELECT SET ENTER NO COM NC OUTPUT 1 OUTPUT 2 NO COMNC 120V COM 240V 1 2 3 4 SA SB 1 2 3 1 2 3 4 5 6 7 8 SA TOD 24V SB C F T775 GROUND SHIELD TO T775 CASE OR TO GROUNDING SCREW SHIELDED CABLE SHIELDED CABLE GROUNDING SCREW NOTE DO NOT GROUND SHIELDED CABLE AT SENSOR END NOTE TO MINIMIZE NOISE PICKUP MAKE CONNECTION FROM SHIELDED ...

Page 6: ...NO COMNC 120V COM 240V 1 2 3 4 SA SB 1 2 3 1 2 3 4 5 6 7 8 SA TOD 24V SB C F M8111 SENSOR A 24 VAC SENSOR B LOAD 1 LOAD 2 SELECT SET ENTER NO COM NC OUTPUT 1 OUTPUT 2 NO COMNC 120V COM 240V 1 2 3 4 SA SB 1 2 3 1 2 3 4 5 6 7 8 SA TOD 24V SB C F M8112 SENSOR A 120 VAC SENSOR B LOAD 1 LOAD 2 BLK WHT SELECT SET ENTER NO COM NC OUTPUT 1 OUTPUT 2 NO COMNC 120V COM 240V 1 2 3 4 SA SB 1 2 3 1 2 3 4 5 6 7 ...

Page 7: ...M 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 ELECTRONIC SERIES 90 MODUTROL MOTOR T775J NOTE B R W Fig 11 Reset control with 24 Vac input Series 90 and 24 Vac loads SELECT SET ENTER OUTPUT 2 NO COMNC 120V COM 240V 1 2 3 4 SA SB 1 2 3 1 2 3 4 5 6 7 8 SA TOD 24V SB C...

Page 8: ...WITCHES FOR SENSOR TO LOAD SELECTION M954 OR M955 MODUTROL MOTOR M4717 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 2 B R W SELECT SET ENTER NO COM NC OUTPUT 1 OUTPUT 2 NO COMNC 120V COM 240V 1 2 3 4 SA SB 1 2 ...

Page 9: ...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 repro...

Page 10: ...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 ...

Page 11: ...sed 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 A B Sensed Temperature 78 Add 3 F or C to above 3 Calibration Setpoint 81 Calibration Setpoint for Heating Mode A B Sensed Temperature 78 Subtract 3 F or C from above 3 Calibration Setpoint 75 Calibrate the Lower ...

Page 12: ...NSOR INPUT TOD AND 24 VAC TERMINALS 1 2 34 SA SB 1 2 3 1 2 3 4 5 6 7 8 SA TOD 24V SB VOLTMETER 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 NO COM NC OUTPUT 1 OUTPUT 2 NOCOM NC 120V COM 240V 0 18 STEP 3 1 2 3 1 2 3 4 3 14 17 8 OPEN GE...

Page 13: ...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 the modulating output will be designated as stage 1 on the LCD display Although the modula...

Page 14: ... 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 Fig 19 Summary of action direction switches PWB SWITCH SWITCH PWB OPEN CLOSED SIDEVIEW OPEN CLOSED RESET DIRECTION SWITCH RESET ACTION SWITCH RESET DIRECTION SWITCH WILL RESET THE COUNTROL POINT UP WHEN OPEN OR DOWN WHEN CLO...

Page 15: ...OOR TEMPERATURE DROPS BELOW SETPOINT B RIGHT RESETS AS IT RISES ABOVE IT C SWITCHES 3 AND 4 ARE NOT USED RESETS CONTROL SETPOINT A DOWN WHEN SENSOR B OUTSIDE TEMPERATURE IS BELOW SETPOINT RESETS CONTROL SETPOINT A DOWN WHEN SENSOR B OUTSIDE TEMPERATURE IS ABOVE SETPOINT RESETS CONTROL SETPOINT A UP WHEN SENSOR B OUTSIDE TEMPERATURE IS BELOW SETPOINT RESETS CONTROL SETPOINT A UP WHEN SENSOR B OUTSI...

Page 16: ...e 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...

Page 17: ... 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 de energized when this error message is flashing for Sensor B When this message is flashing for Sensor A only stage 1 will not be de energized EF EEPROM Failure The values read back from the EEPROM are not the same as written into the EEPROM Th...

Page 18: ...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 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 ...

Page 19: ... 80 Off 76 On 80 78 Off 74 On 120 Off 116 On 80 118 Off 80 Setpoint B ____________ Reset Direction __________ Setpoint B 30 Reset Direction Increase Sensor B _____________ Reset Action ____________ Sensor B 10 Reset Action Below Reset Ratio A _________ Reset Ratio B ___________ Reset Ratio A 1 Reset Ratio B 2 FORMULA 1 FORMULA 1 EXAMPLE Sensor B Sensor B 10 F Setpoint B Setpoint B 30 F Temp Diff _...

Page 20: ...rld Home and Building Control Honeywell Limited Honeywell Limitée 740 Ellesmere Road Scarborough Ontario M1P 2V9 63 2248 4 Rev 9 95 Printed in U S A www honeywell com building components QUALITY IS KEY Home and Building Control Honeywell Inc 1985 Douglas Drive North Golden Valley MN 55422 ...

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