Honeywell T755U User Manual

62-0255-09

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. Humidity, pressure, temperature, or any 0-5 Vdc, 0-10 Vdc, or 4-20 mA input is supported.

A Reset function is available where the Sensor B temperature (e.g. outside temperature) is used to provide reset control for Sensor A (e.g. humidity). For example, as the outside temperature gets colder, the setpoint can automatically be adjusted to prevent condensation.

IMPORTANT

The T775U 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 is required.

Table 1. T775U Controller Configurations.

Controller

Model

T775U2006

T775U2016 N/A Yes 2 2

The T775U includes a digital input for use with the disable or setback option.

The modulating (analog) outputs may be 4-20 mA, 0-10 Vdc, 2-10 Vdc, or Series 90 selectable.

For the H775C1004, H775D1003, and H775E1002 model replacement, the T775U only partially replaces the function of these devices. Check application for suitability.

For the sensor inputs, Sensor A can be 0-10Vdc, 4-20mA, or a standard temperature input. Sensor B is a standard temperature sensor input only. Sensor B is used only for reset on the T775U2006.

The T775U2016 can control Sensor A (universal) and Sensor B (temperature) independently, like other standard T775 controllers.

Description Replaces

H775A1006 H775A1022

Universal: Humidity, Pressure, Temperature, etc.

H775A1048 H775A1063

H775B1005 H775C1004 H775D1003 H775E1002

Output

SPDT Relay

Reset

Outputs

Ye s 2 2

Analog

(Mod)

Outputs

Sensor

Inputs

Nbr of Sensors Included Enclosure

None NEMA 1

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

Temperature Sensorsa (Sensor A or B)

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/N 50001774-001)

• C7031J2009 – 12 foot duct averaging sensor with wiring box

• C7046D1008 – 8 inch duct probe with mounting flange

• C7100D1001 – 12 inch fast response, duct averaging sensor with flange

• C7130B1009 – Room mount sensor

Differential Pressure Sensors

(Sensor A only)

P7640A and PWT pressure transducer models with selectable pressure ranges can be used.

The controller accepts pressure sensors with a signal output of 0-10 Vdc or 4-20 mA for any output range within the following ranges (the minimum and maximum for the sensor output range can be adjusted within the following limits):

• -500 to 500 PSI

• -30.0 to 30.0 inches w.c.

• -3,000 to 3,000 Pa

• -3,000 to 3,000 kPa

Humidity Sensors (Sensor A only)

The controller accepts 0-10 Vdc or 4-20 mA input with a range of 0-100%.

H7625, H7635, and H7655 models (available in 2, 3, and 5% RH accuracy) can be used.

CO2 Sensors

The controller accepts a 0-10 Vdc or 4-20 mA input from C7232 and C7632 CO units.

sensors and is settable in PPM

Universal Sensors (Sensor A only)

The controller accepts 0-5 Vdc, 0-10 Vdc or 4-20 mA input for temperature, pressure, humidity CO 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 +9999.

Actuators

For more information on compatible actuators or other Honeywell products, such as dampers and valves, go to www.customer.honeywell.com select Product Selection Tool under Products.

• Spring return models: ML6425, ML7425, MS4105, MS4110, MS4120, MS7505, MS7510, MS7520, MS8105, MS8110, MS8120

• Non-spring return models: ML4161, ML6174, ML7161, MN6105, MN1010, MN7505, ML7164, MN8810

, etc. They may

. From the home page

Accessories

• 107324A – Bulb Holder, duct insertion

• 107408 – Heat Conductive Compound, 4 ounce

• 50001774-001 – Immersion Well, stainless steel 304, 1/2 in. threading

Product Changes

Below are the changes to T775U models star ting with Series 3 (March 2009). Series 3 can be identified by the sideways 3 after the part number on the device label.

1. Setpoint and Enable options added to the DI options.

2. 0-5 Vdc sensor inputs are now available (for both models).

3. MIN ON time added.

4. HIDE option added to MOD1 and MOD2 (to hide

them on the home screen).

5. PPM and None added to sensors’ unit of measure.

6. With the new T775U2016 model, all outputs can be

controlled to Sensor A or Sensor B. The T775U2006 model controls only to Sensor A.

See form 62-0265 – Temperature Sensors for the T775

Series 2000 Stand-alone Controller

62-0255—09 2

Controller Dimensions

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

1 (25.5)

7/8 (22.5)

2 15/16 (74)

LEFT RIGHT

4 1/16 (103.4)

1/64 (3.8)

8 5/32 (207.1)

4 1/16 (103.4)

2 11/16 (68.1)

7/8 (22.5)

7 23/32

(196)

7/8 (22.5)

Fig. 1. T775U Dimensions in inches (mm).

BEFORE INSTALLATION

Review the “Specifications” on page 38 before installing the controller.

When Installing This Product

1. Read these instructions carefully. Failure to follow

them could damage the product or cause a hazardous condition.

2. Check ratings 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.

INSTALLATION AND SETUP

The following installation procedures are typically performed in the order listed:

1. Mounting — see “Mounting” below.

2. Wiring — see “Wiring” on this page.

3. Checkout — see page 10.

Interface and Programming overview – see page 11.

5. Setup – see page 14.

TOP

4 13/32 (112.1)

3 31/32 (101)

FRONT VIEW

1 (25.5)

BOTTOM

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.

1/2 (12.4)

MOUNTING

This section describes the mounting procedures for the controller and temperature sensor(s).

Controller Mounting

IMPORTANT

Avoid mounting in areas where acid fumes or other deteriorating vapors can attack the metal parts of the controller circuit board, or in areas where escaping gas or other explosive vapors are present.

IMPORTANT

The controller must be mounted in a position that allows clearance for wiring, servicing, and removal.

2 13/16 (71.8)

7/8 (22.5)

M24546

3 62-0255—09

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

CAUTION

SENSOR PLACED IN WELL

IMMERSION WELL

1/2 NPT

USE HEAT

CONDUCTIVE

COMPOUND

M24379

Use a screwdriver to pry out only the knockouts that you will use.

If mounting on DIN rail, be sure to remove the knockouts before mounting. See “Controller Wiring” on page 7 and Fig. 12 on page 9 for recommended knockout usage and locations. If you do not use an opened knockout be sure to cover it.

Mount the controller on any convenient interior location using the four mounting holes provided on the back of the enclosure using #6 or #8 screws (screws are not provided and must be obtained separately). Use controller dimensions in Fig. 1 on page 3 as a guide.

The controller may be mounted in any orientation. However, mounting in the orientation shown in Fig. 1 on page 3 permits proper viewing of the LCD display and use of the keypad.

Humidity, Pressure, and Universal Sensor(s) Mounting and Location

These sensors may be mounted on a wall or panel. Follow the installation instructions specific to the sensor you are installing.

Temperature Sensor(s) Mounting and Location

Temperature sensors may be located up to 1,000 feet (304 m) from the T775U controller. See Table 4 on page 11 for calibration guidelines.

The sensors may be mounted on a wall or panel for sensing space temperature, strapped to a pipe or inserted in an immersion well (see Fig. 2) for hot or 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 lead wire holes, mount the sensor with the lead wires exiting the bottom of the sensor.

NOTES:

1. The included sensor is not designed for very

wet applications. For immersion applications, an immersion well is used.

2. Heat conductive compound must be used in

immersion wells.

3. See “Temperature Sensors (Sensor A or B)”

on page 2 for this type of installation.

Fig. 2. Sensor inserted in immersion well.

NOTE: Multiple sensors may be parallel-series wired

to sense average temperatures in large spaces. See Fig. 3 on page 5.

WIRING

All wiring must comply with applicable 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 top. Be careful to not stress the ribbon cables that connect the keypad and LCD display to the controller circuit board.

Temperature Sensor Wiring

Electrical Shock Hazard. Can short equipment circuitry.

Make sure that metal tube of sensor does not short against T terminals in wall-mounted case.

IMPORTANT

Poor wiring practices can cause erratic readings from the 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 lead wire end pointing up in an area where condensation can occur.

If any of the above conditions cannot be avoided, use shielded cable.

NOTE: Each T775 controller must be wired to its own

sensor(s). However, a benefit of the T775 controller’s accuracy is that there is no more than a 2°F differential between any two T775 controllers.

Reset Temperature Control

If you are implementing two-sensor reset control, Sensor A must always be the controlled temperature and Sensor B must always be the controlling temperature.

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.

Multiple Parallel Temperature Sensors

Multiple sensors can be parallel-series wired to sense average temperatures in large spaces. To maintain control accuracy, the number of sensors to be parallel-series wired must be of the n See Fig. 3.

power (for example, 4, 9, 16, etc.).

62-0255—09 4

Fig. 3. Parallel-series wiring of sensors.

TO T775 CONNECTIONS (SENSOR A) OR (SENSOR B).

SENSORS

M24548

M24549A

SENSORS A AND B ARE POLARITY INSENSITIVE WHEN USING A 1097 OHM PTC TEMPERATURE SENSOR.

SENSOR B IS USED ONLY IN RESET APPLICATIONS ON THE T775U20006.

SHIELDED CABLE

SENSOR

NOTE: SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND. HOWEVER, DO NOT GROUND SHIELDED CABLE AT SENSOR END.

NOTE: TO MINIMIZE NOISE PICKUP, MAKE SENSOR CONNECTION FROM SHIELDED CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY.

T T

SENSOR A

SENSOR B

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

Temperature Sensor Wire Type and Size

Temperature sensors use standard AWG 18/2 unshielded wire. For cable runs greater than 25 feet or where electrical interference may be a problem, shielded cable is recommended. See Fig. 4.

Refer to “Temperature Sensor Calibration” on page 11 for wire size selection where cable runs are longer than 25 feet.

Fig. 4. Sensor Wiring — 2-wire shielded cable connection from Sensor A to temperature sensor.

Humidity, Pressure, and Universal Sensor Wiring

Sensors with a 0-5 Vdc, 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.

Sensors use standard AWG 18 unshielded wire. For cable runs greater than 25 feet, shielded cable is recommended.

The sensors in Fig. 5 – 8 beginning on page 6 are examples and illustrate voltage and current wiring for 3wire 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:

5 62-0255—09

1. Other transmitters can be wired in the same

manner. For example, the 0-10Vdc wiring shown in Fig. 5 on page 6 with the H76XX sensor can also be done with the P7640 or any other transmitter.

2. The T775U V terminal outputs 18 Vdc.

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

M24551

NOTES:

1. SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND. HOWEVER, DO NOT GROUND SHIELDED CABLE AT SENSOR END.

2. TO MINIMIZE NOISE PICKUP, MAKE SENSOR CONNECTION FROM SHIELDED CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY.

EXAMPLE OF

P7640A

PRESSURE

SENSOR;

0-10 VDC

CONNECTION

SENSOR A

SENSOR B

T T

SHIELDED CABLE

PWR

OUT

COM

C S V

(HOT)

24 VAC

SHIELDED CABLE

C S

SENSOR A

SENSOR B

THE T775U WILL ONLY ACCEPT 0-10 VDC AND 4-20 MA SENSORS. IF REPLACING AN H775 CONTROLLER THAT USES A C7600B OR OTHER 2-10 VDC SENSOR, THE SENSOR MUST BE REPLACED. REPLACE THE C7600B2008 SENSOR (2-10VDC OUTPUT) WITH THE H7655A1001 (0-10 VDC OUTPUT) SENSOR. THE H7655A1001 SENSOR USES THE SAME ENCLOSURE STYLING AND WIRING AS THE C7600B.

Fig. 5. Sensor Wiring — 3-wire shielded cable connection from Sensor A to 0-10 Vdc sensor

(H76xx humidity sensor shown).

NOTES:

1. SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND. HOWEVER, DO NOT GROUND SHIELDED CABLE AT SENSOR END.

2. TO MINIMIZE NOISE PICKUP, MAKE SENSOR CONNECTION FROM SHIELDED CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY.

CSV

EXAMPLE OF

GND

VIN

H76XX HUMIDITY SENSOR; 0-10 VDC CONNECTION

M24550

Fig. 7. Sensor Wiring — 2-wire shielded cable

connection from Sensor A to a 0-10 Vdc sensor

using separate transformer.

SHIELDED CABLE

SENSOR A

V T

SENSOR B

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 4-20MA LOOP POWERED WIRING, THE SENSOR MUST BE CAPABLE OF OPERATION WITH 8V OR LESS ACROSS ITS TERMINAL.

Fig. 6. Sensor Wiring — 2-wire shielded cable

connection from 4-20 mA sensor to

T775 controller (loop powered wiring).

62-0255—09 6

PWR

OUT

COM

M24890C

EXAMPLE OF P7640A 4-20 MA SENSOR CONNECTION

PWR ZEROCOMOUT

12-30 VDC

SHIELDED CABLE

C S V T T

Fig. 8. Sensor Wiring — 2-wire 4-20mA sensor input

to T775 controller using a separate (Vdc only)

SENSOR A

SENSOR B

transformer.

POWER SUPPLY

+ –

NOTES:

1. SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND. HOWEVER, DO NOT GROUND SHIELDED CABLE AT SENSOR END.

2. TO MINIMIZE NOISE PICKUP, MAKE SENSOR CONNECTION FROM SHIELDED CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY.

M24889A

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

WARNING

CAUTION

M24296

NO HIGH VOLTAGE. CLASS 2 WIRING ONLY.

EARTH GROUND TERMINAL MUST BE CONNECTED TO CONDUIT CLAMP LOCALLY.

Controller Wiring

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.

Do not use 24 Vac power to power any external loads if 120 Vac or 240 Vac is used to power the T775U.

A separate earth ground is required.

Equipment damage can result if the earth ground is not connected. See Fig. 9 and Table 2 on page 8.

Equipment Damage Hazard. Electrostatic discharge can short equipment circuitry.

Ensure that you are properly grounded before handling the unit.

See Fig. 11 on page 8 for locating the appropriate power input, remote sensors input, low voltage, contact closure, and load output terminals.

Access to the terminals can be gained through standard conduit knockouts (A through E in Fig. 11 on page 8) located around the perimeter of the enclosure:

• Knockouts A and B should be used only for sensor and 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 connections:

Single wire – from 14 to 18 AWG solid or stranded

Using Fig. 10 on page 7 as a guide, prepare wiring for the terminal blocks, as follows:

1. Strip 1/2 in. (13 mm) insulation from the conductor.

2. Cut a single wire to 3/16 in. (5 mm). Insert the wire

in the required terminal location and tighten the screw.

3. If two or more wires are being inser ted into one terminal location, twist the wires together a minimum of three turns before inserting them to ensure proper electrical contact.

4. Cut the twisted end of the wires to 3/16 in. (5 mm) before inserting them into the terminal and tightening the screw.

5. Pull on each wire in all terminals to check for good mechanical connection.

1. STRIP 1/2 IN. (13 MM)

FROM WIRES TO BE ATTACHED AT ONE TERMINAL.

1/2 (13)

IMPORTANT

Fig. 9. Earth Ground.

Poor wiring practices can cause erratic readings from the sensor. To ensure proper operation, ensure that good mechanical connections are made to both the sensor and the controller.

When wiring the input power, only one source of power can be applied to the T775U (24 Vac or 120 Vac or 240 Vac).

2. TWIST WIRES

TOGETHER WITH PLIERS (A MINIMUM OF THREE TURNS).

3. CUT TWISTED END OF WIRES

TO 3/16 IN. (5 MM) BEFORE INSERTING INTO TERMINAL AND TIGHTENING SCREW. THEN PULL ON EACH WIRE IN ALL TERMINALS TO CHECK FOR GOOD MECHANICAL CONNECTION.

M24552

Fig. 10. Attaching two or more wires at terminal

7 62-0255—09

blocks.

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

Controller Wiring Details

The wiring connection terminals are shown in Fig. 11 and are described in Table 2. See Fig. 12 – Fig. 19 beginning on page 9 for typical T775U wiring applications.

Fig. 11. T775U Terminal and Feature Locations.

KNOCKOUT A

–

MOD 1

MOD 2

DIGITAL

INPUT

KNOCKOUT B

POWER

24 VAC

OUTPUT RELAY 1

KNOCKOUT C

KNOCKOUT E

V T T

–

W B

–

– +

120

COM

240

KNOCKOUT D

SENSOR A

SENSOR B

POWER 120/240 VAC

OUTPUT RELAY 2

WHEN USED FOR TEMPERATURE OR 4-20mA SENSING, SENSORS A AND B USE THE TWO TT CONNECTIONS AND ARE POLARITY INSENSITIVE.

FOR MOD 1 AND MOD 2 CURRENT (mA) OR VOLTAGE (VDC) OUTPUT, USE SIGNAL (+) & COMMON (-). FOR MOD 1 AND MOD 2 SERIES 90 OUTPUT, USE W, R, & B.

A SEPARATE EARTH GROUND IS REQUIRED FOR ANY POWER SOURCE (24, 120, OR 240 VAC)

M24553A

Table 2. Description of Wiring Terminal Connections.

Connection

Termi nal

Label Description Connection Terminal Label Description

Sensors Outputs

C – common S – signal V – voltage

Sensor A

S and V 4-20mA input; see Fig. 7 on

T T

Sensor B T T Temperature Sensor; polarity

0-10 Vdc input: Universal

sensor for humidity, pressure,

temperature, etc.

Mod 1

Mod 2

+ - (Vdc or mA) W R B (Series 90)

page 6 24 Vac Power

Temperature Sensor; polarity

insensitive

24V + + 24 Vac Hot

Common - 24 Vac Common

Ground

120 or 240 Vac Power

Modulating Output

Earth Ground

Input 120 Vac 120 120 Vac Power

DI + - Digital Input (dry contact) Common COM Common

Outputs 240 Vac 240 240 Vac Power

Relay 1 NO / COM /

Relay 2

For applications that do not use Reset, only Sensor A is available for use.

For Series 90 connections, you must insert a 340 Ohm resistor across terminals R and W. See Fig. 18 on page 10. The resistor is included with the controller.

A separate earth ground is required for all installations regardless of the power source (24, 120, or 240 Vac).

62-0255—09 8

NC 120-240 Vac Relay Output

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.

M24557B

MODULATING OUTPUT TERMINAL (MOD 1)

B R

–

B R

–

POWER

T1 T2

–

HONEYWELL MODUTROL MOTOR WITH 4-20 mA MODULATING INPUT

COM

LOAD 2

LOAD 1

COM

120V

M33844

FOR SPECIFIC SEN SOR WIRING (TEMPERATURE , HUMIDITY, PRESSURE, ETC), REFER TO THE SENSOR WIRING SECTIONS BEGINNIN G ON PAGE 4.

120

COM

240

C S V

T T

– +

WIRING APPLICATION EXAMPLES

Fig. 12 – 19 illustrate typical controller wiring for various applications.

NOTE: The electronic Series 90 output provided with

modulating T775 models can not drive electro-mechanical slidewire devices like older Series 3 modulating meters (prior to Series

6), V9055s, and S984s.

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).

–

(HOT)

LOAD 1

LOAD 2

24 VAC

COM

Fig. 14. Wiring for Two-stage Control with 120 Vac

(120 Vac Input and 120 Vac Load).

–

FOR SPECIFIC SENSOR WIRING (TEMPERATURE, HUMIDITY,

PRESSURE, ETC), REFER TO THE SENSOR WIRING SECTIONS BEGINNING ON PAGE 4.

Fig. 12. Wiring for Two-stage Control – 24 Vac Input

Fig. 13. Wiring for mod motor or direct coupled

actuator with 4 to 20 mA control input.

and 24 Vac Load.

COM

M24554A

NO COM

FOR SPECIFIC SEN SOR WIRING (TEMPERATURE , HUMIDITY, PRESSURE, ETC), REFER TO THE SENSOR WIRING SECTIONS BEGINNIN G ON PAGE 4.

240V COM

120

240

COM

LOAD 2

COM

LOAD 1

M33845

Fig. 15. Wiring for Two-stage Control with 240 Vac.

9 62-0255—09

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

WARNING

M24560B

TO VERIFY OUTPUT, TEST OPEN CIRCUIT VOLTAGE BETWEEN THE MOD 1 TERMINALS W AND R.

- MINIMUM (DRIVE CLOSED) SIGNAL LESS THAN 0.17 VDC

- MAXIMUM (DRIVE OPEN) SIGNAL IS GREATER THAN 1.7 VDC

USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.

INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.

MODULATING OUTPUT TERMINAL (MOD 1)

B R

–

B R W

–

T1 T2 B WR

POWER

HONEYWELL ELECTRONIC SERIES 90 MODUTROL MOTOR

INPUT

– +

M24559

DIGITAL

Fig. 16. Wiring for Digital Input (dry contact).

HONEYWELL MODUTROL MOTOR WITH VOLTAGE CONTROL INPUT

–

T1 T2 C R

POWER

–

MODULATING OUTPUT TERMINAL (MOD 1)

USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.

Fig. 17. Wiring for mod motor or direct coupled

actuator with 0-10 Vdc control input.

W B

–

HONEYWELL

ELECTRONIC SERIES 90

MODUTROL MOTOR

T1 T2 B WR

POWER

MODULATING OUTPUT TERMINAL (MOD 1)

USE SEPAR ATE TRA NSFORMER FOR T775 W HEN USING 24 VAC.

A 250 OHM RES ISTOR PROVIDES 40% AUTH ORITY WHEN

USING A 150 OH M MINIMUM POSIT ION POTENTIOME TER.

INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.

Fig. 19. Wiring for Changeover Relay and

Minimum Position Potentiometer used with

MINIMUM POSITION

POTENTIOMETER

(Q209)

W R B

–

W B

–

Series 90 Modutrol Motors.

CHECKOUT

Inspect all wiring connections at the controller terminals, and verify compliance with the installation wiring

M24558B

diagrams.

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.

If any wiring changes are required, first be sure to remove power from the controller before starting work. Pay particular attention to verifying the power connection (24, 120, or 240 Vac).

After the controller is mounted and wired, apply power.

SPDT CHANGEOVER

(H205 OR H705)

M24561B

Fig. 18. Wiring for Series 90 Modutrol Motor Control.

62-0255—09 10

Power Loss

The date and time settings are retained for 24 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.

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

M24304

TEMPERATURE (DEGREES)

RESISTANCE (OHMS)

1403

1317

1231

1145

1059

973

20 40 60 80 100 120 140 160 180 200 220

0 10 20 30 40 50 60 70 80 90 100

°F

°C

0-20-40

120

110

250

-40 -20 -10-30

1489

887

801

1097 ± 0.08 OHMS AT 77°F (25°C)

POSITIVE TEMPERATURE COEFFICIENT (PTC) OF 2.1 OHMS PER °F

Humidity, Pressure, and Universal Sensor Calibration

A calibration parameter is available using Setup mode. The calibration range is +/- 10% of the Min Value to Max Value range setup for the sensor. See examples in Tabl e 3 .

Table 3. Calibration Range Examples.

Units

Min.

Val ue

Example

Max.

Val ue

Example

Min-Max

Range Result

PSI 100 400 300 ± 30 PSI

Inches W.C .

Pa or kPa

-20.0 20.0 40 ± 4 in. W.C.

-2,000 3000 5000 ± 500 Pa/kPa

% 10 100 90 ± 9%

The calibration value is set in section “1.2.2.3. CALIBRATE (Sensor A or B)” on page 17.

Temperature Sensor Calibration

As wire length increases, resistance increases and thus the temperature reading increases. If necessary, calibrate the sensor input by reducing the value by the amount shown in the Table 4 on page 11. For example, a wire run with 18 gauge wire of 1,000 feet, requires a calibration offset of -6.0°F.

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.

See “1.2.2.3. CALIBRATE (Sensor A or B)” on page 17 for the instructions to enter the calibration value.

NOTE: The resistance output on the temperature

sensors change at the rate of 2.2 Ohms per °F (3.85 Ohms per °C).

Table 4. Temperature Sensor Calibration for Resis-

tance Loss due to Wire Length.

Temperature Offset in

AWG

Rating m /ft

200 ft 500 ft 1,000 ft

°F (Feet)

14 2.5 0.46 1.14 2.28

16 4.0 0.72 1.82 3.64

18 6.4 1.16 2.90 5.82

20 10.2 1.86 4.64 9.28

Calibration

Range

Table 4. Temperature Sensor Calibration for Resis-

tance Loss due to Wire Length. (Continued)

AWG

Rating m /ft

Temperature Offset in

200 ft 500 ft 1,000 ft

°F (Feet)

22 16.1 2.92 7.32 14.64

AWG

Rating m /m

Temperature Offset in

°C (Meter)

100 m 200 m 300 m

14 8.3 0.44 0.86 1.30

16 13.2 0.68 1.38 2.06

18 21.0 1.10 2.18 3.28

20 33.5 1.74 3.48 5.22

22 52.8 2.74 5.48 8.22

This is the distance from the controller to the sensor (already accounts for round trip distance).

Fig. 20 shows how sensor resistance varies with temperature for a sensor having a positive temperature coefficient (PTC) of 2.1 Ohms per degree 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.

11 62-0255—09

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

RELA

HOME

YS 1 2

MENU AREA

SENSORS

SENSOR A

SENSOR B

DATA AREA

MOD1 40% MOD2 60% DI ON

home menu

LOCK ICON

6 BUTTON KEYPAD

M24563

Fig. 21. LCD Display - Home Screen And Keypad.

Menu Area – On the home screen, the LCD displays the

configured relays and whether they are active. In Program, Setup or Schedule mode, the LCD displays the current menu selection and its order within the menu hierarchy.

Data Area – On the home screen, the LCD displays the sensors and outputs status. In Setup or Program mode, the LCD displays menu choices, parameter selections, and data values.

Lock Icon – The icon indicates the MENU button is locked and prevents access to the Setup and Program menus.

NOTE: Pressing and holding the HOME and MENU

buttons simultaneously for five seconds locks/unlocks the MENU button.

6-Button Keypad – The keypad is used to access the

menus and enter values (see “Using the LCD Panel Interface”).

Up and Down Arrow Buttons (p and q)

Use these buttons to move your selection up and down through a menu or list.

• When the desired item is highlighted, you press the u arrow button to display that item’s content.

• When a value 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 output relays, and error and status codes.

When using Reset, the Heat/Cool setpoint(s) display on the home screen for the Mod and Relay outputs; see Fig. 22.

Active relays are indicated by the small black square (¢) just below the relay number. Fig. 22 shows the home screen with relay 2 energized.

Pressing the t and u buttons from the home screen cycles through each modulating output that is paired with the sensor it controls and the active output relays.

HOME RELAYS 1 2 ON

SENSORS SENSOR A

SENSOR B 84

MOD1 40% MOD2 60%

DI ON

HOME RELAYS 1 2 ON

MOD 1 40% COOL SETPOINT

SENSOR A 62

MOD1 40% MOD2 60%

DI ON

HOME RELAYS 1 2 ON

REL 2 ON

HEAT SETPOINT

60 SENSOR A

RT 12345 HRS

MOD1 40% MOD2 60%

DI ON

Using the LCD Panel Interface

The 6-button keypad is used to move through the menus and enter or change parameter values.

Home Button

Pressing the HOME button at any time exits the current Programming or Setup display screen and returns to the home screen as shown in Fig. 21 and Fig. 22.

Menu Button

• Pressing the MENU button always displays the Program menu. If you are in Setup mode, you exit setup and return to the Program menu.

• Pressing and holding the MENU button for five seconds leaves the current screen and displays the Setup menu.

Left and Right Arrow Buttons (t and u)

Use these buttons to move backward (t) and forward (u) through the Program and Setup menus.

62-0255—09 12

M24564

Fig. 22. LCD Display - Home Screen Displaying

Sensors, Mod Outputs, and Active Relays.

NOTES:

1. The modulating output home screen and the relay home screen do not dynamically update the active relay status, sensor values, and modulating output percentages. The information is a snapshot taken when you press the t or u button to display the screen.

2. In Reset mode, the home screen displays the effective setpoint.

IMPORTANT

After four minutes of inactivity (no buttons pressed), the LCD display reverts to the home screen display.

Accessing the Menus

Menus are used for programming, scheduling, viewing the summary settings, and setup of advanced options.

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