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Electronic Remote Temperature Controller
GENERAL
The T775J family of electronic remote temperature controllers
provides reset control for chillers, heating and cooling
systems, and other applications where electronic accuracy in
addition to remote sensing is desired.
Copyright © 1995 Honeywell Inc. • All Rights Reserved
FEATURES
• T775 model provides reset control with two
temperature inputs and one of either 4 to 20 mA, 0 to
18 Vdc, or Electronic Series 90
modulating output with 0 or 1 relay output stages, or 1
or 2 relay output stages with no modulation.
• -40°F to +220°F (-40°C to +105°C) setpoint temperature
range.
• -45°F to +225°F (-43°C to +107°C) sensor display
range.
• -30°F to + 140°F (-34°C to +60°C) ambient temperature
range.
• Linear platinum temperature sensor.
• Adjustable temperature range and differential.
• Adjustable throttling range of 2° to 30° F or C.
• Adjustable reset ratio.
• Liquid crystal display (LCD) indication for mode and
output status.
• Keypad provides ease of programming 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 safety
or limit controls, use a separate safety or limit control
device in conjunction with the T775.
a
The Electronic Series 90 output provided with T775J
models will not drive electromechanical Series 90 slidewire
devices.
General ............................................................................... 1
Features .............................................................................. 1
Specifications ...................................................................... 2
Ordering Information ........................................................... 2
Installation ........................................................................... 3
Description/Operation ......................................................... 13
Checkout ............................................................................. 18
T775J
PRODUCT DATA
a
Proportional + Integral
Contents
63-2248-4

Summary of Contents

  • Page 1

    GENERAL cooling. • 24/120/240 Vac voltage inputs. • Spdt relay outputs. The T775J family of electronic remote temperature controllers provides reset control for chillers, heating and cooling systems, and other applications where electronic accuracy in IMPORTANT addition to remote sensing is desired.

  • Page 2

    Honeywell Inc., 1885 Douglas Drive North Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 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, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

  • Page 3

    M7431 M344C 7/8 (22) DIAMETER Fig. 2. Parallel-series wiring of sensors. Fig. 1. Approximate T775J dimensions in in. (mm). Sensor Mounting Mount the sensor on a wall or panel for sensing space INSTALLATION temperature (Fig. 3); strap it to a pipe, or insert it into a well (Fig.

  • Page 4

    TERMINAL When wiring the input power, only one source of power can SCREW be applied to the T775J (e.g., 24 or 120 or 240 Vac). TERMINAL Knockouts B and C can be used to gain access to 120 or 240 Vac input terminals and the load relay output terminals.

  • Page 5

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER TEMPERATURE DISPLAY F SELECTION PROGRAMMING KEYS ENTER SELECT SENSOR INPUT, RESET DIP TOD, AND SWITCHES 24V TERMINALS MOUNTING HOLE 1 2 3 4 5 6 7 8 LOCATION SA TOD 24V SB KNOCKOUT "A" MODULATING OUTPUT...

  • Page 6

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER ENTER SELECT ENTER SELECT SENSOR A 1 2 3 4 5 6 7 8 SA TOD 24V SB SENSOR B SENSOR A 1 2 3 4 5 6 7 8 24 VAC SA TOD 24V SB...

  • Page 7

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER ELECTRONIC SERIES 90 MODUTROL MOTOR T1 T2 B R W ENTER SELECT SENSOR A 1 2 3 4 5 6 7 8 24 VAC SA TOD 24V SB SENSOR B POWER INPUT B R W...

  • Page 8

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER MODULATING MOTOR WITH VOLTAGE CONTROL INPUT T1 T2 C R F ENTER SELECT SENSOR A 1 2 3 4 5 6 7 8 SA TOD 24V SB SENSOR B POWER INPUT 240 VAC OUTPUT 2...

  • Page 9

    Use shielded cable if any of the above conditions cannot be avoided. CAUTION Device Setup The T775J will not allow the user to program for both heating and cooling loads to be energized at the same Determine the loads to be controlled and the operating time.

  • Page 10

    Programming Stage Control Values label inside the T775J cover. If you have a 0 to 18 Vdc output T775J, go to the Calibration Procedure for 0 to 18 Vdc Output T775 Device Programming Worksheet before continuing to program the stage control values.

  • Page 11

    T775J etc) is displayed on the voltmeter. (see Fig. 12). Confirm upper voltage level: Loosen the screw in the upper right corner of the T775J • Record the sensed temperature for sensor approximately six turns with a screwdriver (see controlling stage 1.

  • Page 12

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER STEP 1 STEP 2 VOLTAGE SPAN ZEROING SELECTION SWITCH VOLTAGE DIAL 1 2 3 4 OPEN SELECT ENTER 1 2 3 4 5 6 7 8 SA TOD 24V SB MODULATING VOLTAGE OUTPUT SENSOR INPUT,...

  • Page 13

    7 and 8 of the input terminal block, while Sensor A is wired to heating or cooling medium control point caused by a change pins 1 and 2. The T775J is capable of providing modulating or in the outdoor temperature. It is the ratio of outdoor relay outputs for reset control.

  • Page 14

    1/8 of the throttling range. RESET ACTION SWITCH OPEN OPEN CLOSED There are three modulation options available for the T775J (see Fig. 20 for modulating output connecting terminals). RESET DIRECTION SWITCH OPEN Fig. 18. Reset switch configuration. IF THE OUTSIDE SENSOR (B)

  • Page 15

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER SETPOINT "B" (OUTSIDE TEMPERATURE) BELOW ABOVE RESET DIRECTION RESET DIRECTION SWITCH SWITCH RESET ACTION RESET ACTION SWITCH SWITCH RESETS CONTROL SETPOINT A UP RESETS CONTROL SETPOINT A UP WHEN SENSOR B (OUTSIDE WHEN SENSOR B (OUTSIDE TEMPERATURE) IS BELOW SETPOINT.

  • Page 16

    Motors that accept an input selection for 0 to 18 Vdc modulating devices. The span signal of 4-20 mA or other Honeywell Inc motors with the corresponding to each switch is given on the printed wiring use of resistor kits.

  • Page 17

    The error codes that may be seen flashing on the display are: 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- TEMPERATURE (DEGREES) M2829 energized when this error message is flashing for Sensor B.

  • Page 18

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER CHECKOUT Divide Reset Ratio B value by Reset Ratio A value. Multiply the result in step g. by Temp Diff After the controller is installed and wired, apply power. Using (step a.). the programmed control values, verify device operation after If Reset Direction Switch is set to increase, completing Table 3.

  • Page 19

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER Table 3. Checkout Table. Checkout Table Checkout Table Example Reset Reset Reset Reset Heat or Value Value Heat or Load 1 Load 2 Value Value Cool Load 1 Load 2 Load 1 Load 2 Cool...

  • Page 20

    T775J ELECTRONIC REMOTE TEMPERATURE CONTROLLER Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc. Honeywell Limited-Honeywell Limitée 1985 Douglas Drive North 740 Ellesmere Road Golden Valley, MN 55422 Scarborough, Ontario QUALITY IS KEY M1P 2V9 63-2248—4...

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