Honeywell T775L Installation Guide

62-0257-13

T775L Series 2000 Electronic Stand-Alone Staging Controller

INSTALLATION INSTRUCTIONS

PRODUCT DESCRIPTION

The T775 electronic stand-alone controllers are the next generation of commercial and agricultural controls capable of remote sensing of temperature and providing switched and/or proportional outputs to various types of loads. A built-in time clock is standard.

The T775L model can be used to stage multiple relays from two independent heat or cool setpoints. The number of stages for each setpoint can be freely chosen, limited only by the number of relays available.

The T775L can be configured with up to two T775S Expansion Modules for a maximum of up to 12 stages.

IMPORTANT

The T775L 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. T775L Controller Configuration.

Controller Model Description Output Reset

T775L2007

The T775L model can be used to stage multiple relays from two independent heat or cool setpoints. The number of stages for each setpoint can be freely chosen, limited by the number of relays available (up to 12 stages using two T775S expansion modules). In addition to the two staged loops, up to two additional relays can be available for independent on-off control.

The maximum number of non-sequenced relays is two (2) with each having its own setpoint and its own throttling range. These relays are available if not being used by the staged relay loops.

The T775L includes a digital input for use with the disable or setback option.

Stage Sequencer with Reset

Yes

SPDT Relay

Outputs

Digital

Input

Number of

Sensor

Sensors

Inputs

Included

21 YesYesNEMA 1

Stage

Control

Addable

T775S Enclosure

E4436

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

Temperature Sensors

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-STRAP – Strap-on sensor with wiring box

• 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

• C7031B2008 – 6 inch duct mount with wiring box

• 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

See form 62-0265 – Temperature Sensors for the T775

Series 2000 Stand-alone Controller

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

• C7130B1009 – Room mount sensor

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 the T775L model 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. MIN ON added.

2. SYNC added.

3. Differential and throttling range increased to 300°F.

4. Setpoint, Enable, and DHW options added to the DI

options.

Controller Dimensions

TOP

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)

1 (25.5)

Fig. 1. T775L Dimensions in inches (mm).

62-0257—13 2

4 13/32 (112.1)

3 31/32 (101)

FRONT VIEW

BOTTOM

1/2 (12.4)

2 13/16 (71.8)

7/8 (22.5)

M24378

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

BEFORE INSTALLATION

Review the “Specifications” on page 37 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 8.

4. Interface and Programming overview – see page 9.

5. Setup – see page 11.

6. Programming the Controller with no Reset – see

page 22 or Programming the Controller with Reset – page 25.

7. Scheduling (optional) – see page 31.

Additional topics are:

• Temperature sensor calibration begins on page 8.

• Interface overview begins on page 9.

• Summary menu begins on page 36.

• Troubleshooting begins on page 36.

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 2 as a guide.

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

Temperature Sensor(s) Mounting and Location

Temperature sensors may be located up to 1,000 feet (304 m) from the T775L controller. See Table 3 on page 8 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” on page 2 for this type of installation.

SENSOR

PLACED IN WELL

USE HEAT

CONDUCTIVE

COMPOUND

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.

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 5 and Fig. 7 on page 6 for recommended knockout usage and locations. If you do not use an opened knockout be sure to cover it.

1/2 NPT

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 4.

IMMERSION WELL

M24379

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 temperature sensor wiring and the T775L 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.

3 62-0257—13

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

CAUTION

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

SENSORS

M24380

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 temperature sensor must be wired to a

single T775 controller. 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 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.).

Fig. 3. Parallel-series wiring of sensors.

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 8 for wire size selection where cable runs are longer than 25 feet.

T T

SENSORS A AND B USE THE TWO TT CONNECTIONS AND ARE POLARITY INSENSITIVE.

Fig. 4. Sensor Wiring — Showing shielded cable connection to Sensor A.

62-0257—13 4

SENSOR A

SENSOR B

SHIELDED CABLE

NOTE: SHIELDED CABLE MUST BE CONNECTED TO AN 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.

SENSOR

M24381

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING 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 T775L.

A separate earth ground is required.

Equipment damage can result if the earth ground is not connected. See Fig. 5 and Table 2 on page 6.

Equipment Damage Hazard. Electrostatic discharge can short equipment circuitry.

Ensure that you are properly grounded before handling the unit.

See Fig. 7 on page 6 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. 7 on page 6) 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

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. 5. 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 T775L (24, 120, 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.

M24382

Fig. 6. Attaching two or more wires at terminal blocks.

5 62-0257—13

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

Controller Wiring Details

The wiring connection terminals are shown in Fig. 7 and are described in Table 2 on page 6.

See Fig. 8 – Fig. 12 beginning on page 7 for typical T775L wiring applications.

KNOCKOUT A

T T

T775 BUS

DIGITAL INPUT

KNOCKOUT B

POWER

24 VAC

OUTPUT RELAY 4

OUTPUT RELAY 1

KNOCKOUT C

SENSORS A AND B USE THE TWO TT CONNECTIONS AND ARE POLARITY INSENSITIVE.

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

– +

KNOCKOUT E

Fig. 7. T775L Terminal and Feature Locations.

120

COM

240

SENSOR A

SENSOR B

OUTPUT RELAY 3

POWER 120/240 VAC

OUTPUT RELAY 2

KNOCKOUT D

M24383

Table 2. Description of Wiring Terminal Connections.

Connection

Terminal

Label Description

Sensors

Sensor A

Sensor B

T T

Temperature Sensor; polarity insensitive

Outputs

Relay 1

Relay 2

Relay 3

NO COMNC120-240 Vac Relay Output

Relay 4

Input

DI + - Digital Input (dry contact)

Interconnect

T775 BUS

Terminal Connection to/from

T775S

24 Vac Power

24V + + 24 Vac Hot

Common - 24 Vac Common

Ground

Earth Ground

120 or 240 Vac Power

120 Vac 120 120 Vac Power

Common COM Common

240 Vac 240 240 Vac Power

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

NOTE: Relays 5–8 are assigned to the first T775S

Expansion Module, if connected. Relays 9–12 are assigned to the second T775S, if connected.

WIRING APPLICATION EXAMPLES

Fig. 8 – 12 beginning on page 6 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.

62-0257—13 6

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

(HOT)

24 VAC

COM

M24384A

LOAD 2

LOAD 1

SENSOR A

T T

(HOT)

24 VAC

M24385A

SENSOR A

T T

COM

LOAD

COM

SENSOR A

T T

Fig. 8. Wiring for Two-stage Control – 24 Vac Input

and 24 Vac Load.

Fig. 9. Wiring for Four-stage Control – 24 Vac Input

and 24 Vac Load.

120V COM

120

240

COM

LOAD 2

COM

NO COM

LOAD 1

FOR 240 VAC LOAD, CON NECT TO 240 TERMINAL .

Fig. 10. Wiring for Two-stage Control with 120 or 240

Vac (120 Vac Input and 120 Vac Load shown).

SENSOR B

T T

LOAD 4

LOAD 1

COM

FOR 240 VAC LOAD, CON NECT TO 240 TERMINAL .

Fig. 11. Wiring for Four-stage Control with 120 or 240

Vac (120 Vac Input and 120 Vac Load shown).

120V COM

120

240

COM

SENSOR A

LOAD

M24386A

M24387A

7 62-0257—13

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

WARNING

M24391

DIGITAL

INPUT

–

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

See “1.1.1.2. CALIBRATE (the sensor)” on page 13 for the instructions to enter the calibration value.

See Table 3 and Fig. 13 on page 8 for temperature resistance information.

Table 3. Temperature Sensor Calibration for Resis-

tance Loss due to Wire Length.

AWG

Fig. 12. Wiring for Digital Input (dry contact).

Rating mΩ/ft

14 2.5 0.46 1.14 2.28

CHECKOUT

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

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

22 16.1 2.92 7.32 14.64

Temperature Offset in

°F (Foot)

200 ft 500 ft 1,000 ft

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.

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.

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 3. 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.

62-0257—13 8

AWG

Rating mΩ/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. 13 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. 13. Sensor Resistance vs. Temperature.

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

DI ON

HOME 1

2 3 4 5 6 7 8 9 10 11 12

SENSORS

SENSOR A

SENSOR B

DI ON

HOME

L1 1-4 ON

HEAT SETPOINT

SENSOR A

RT 1436 HRS

1 2 3 4 5 6 7 8 9 10 11 12

DI ON

HOME

REL 9 OFF

HEAT SETPOINT

SENSOR A

RT 684 HRS

1 2 3 4 5 6 7 8 9 10 11 12

M24398

INTERFACE OVERVIEW

The T775L 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.

HOME

1 2 3 4 5 6 7 8 9 10 11 12

SENSORS

SENSOR A

SENSOR B

DI ON

home menu

Fig. 14. 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”).

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. 14 and Fig. 15.

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.

MENU AREA

DATA AREA

LOCK ICON

6 BUTTON KEYPAD

M24397

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

Left and Right Arrow Buttons ( and )

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

Up and Down Arrow Buttons ( and )

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

• When the desired item is highlighted, you press the  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  or  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 active status of the output loops and relays, and error and status codes.

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

15.

Active relays are indicated by the small black square () just below the relay number. Fig. 15 shows the home screen with relays 1, 2, and 4–6 energized.

Pressing the  and  buttons from the home screen cycles through the sensors, loops, and additional relay(s).

Fig. 15. LCD Display - Home Screen Displaying

Sensors, Loops, and additional Relay(s).

NOTES:

1. The loop home screen and the relay home screen do not dynamically update the active relay status and sensor values. The information is a snapshot taken when you press the  or  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.

9 62-0257—13

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

Accessing the Menus

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

Program, Schedule, and Summary Menus

To access these menus from the home screen, press the MENU button. See Fig. 16.

HOME 1 2 3 4 5 6 7 8 9 10 11 12

SENSORS

SENSOR A

SENSOR B

DI ON

home

MENU DISPLAY WHEN

SCHEDULING IS SET

PROGRAM

SCHEDULE

SUMMARY EXIT

Fig. 16. Menus.

Depending on whether scheduling is enabled or not, the LCD displays one of two menus as shown in Fig. 16. Scheduling is enabled from the Setup menu’s Output settings (see “1.3.3.1. USE SCHED” on page 15).

Setup Menu

To access the Setup menu, press and hold the MENU button for five seconds. See Fig. 17.

HOME 1 2 3 4 5 6 7 8 9 10 11 12

SENSORS

SENSOR A

SENSOR B

DI ON

home

FIVE

SECONDS

Fig. 17. Setup Menu.

Using the Menus

When you are working with the menus, use the:

• Left arrow button () to scroll backward through the

menus

• Right arrow button () to select the highlighted menu

item and display its content

SENSORS

OUTPUTS EXIT

MENU DISPLAY WHEN

SCHEDULING IS NOT SET

PROGRAM

EXIT

M24399

SETUP

M24400A

• Up and Down arrow buttons ( and ) to scroll up

and down through a list of items or to increase or decrease the value of a displayed parameter

NOTES:

1. If you press the HOME button or there is no keypad activity for four minutes, you exit Program mode and return to the home screen.

2. If you press the MENU button, you exit and return to the menu.

PROGRAMMING OVERVIEW

The controller must be programmed before being placed into service.

IMPORTANT

During programming, the controller is live at all times. For example, the contacts may open and close when adjusting the setpoint.

The programming process uses a hierarchical menu structure that is easy to use. You press the buttons to move forward and backward through the menus.

NOTES:

1. The T775L controller interface is intuitive. You may want to use this procedure simply as a reference to locate the particular option or parameter of interest.

2. The menus can display only those relays that are defined in Setup (see “1.3.1. Number of RELAYS” on page 14). For example, if you configure only one relay, then only one relay displays on the appropriate menus.

3. If you press the HOME button or there is no keypad activity for four minutes, you exit Program mode and return to the home screen.

4. If you press the MENU button, you exit Program mode and return to the menu.

Control Loops

The T775L provides the capability to have up to two PID control loops, which allow multiple stages to be assigned to a single setpoint in each loop.

Setpoint and Differential

The following describes the relationship between setpoint and differential for heating and cooling. These settings are programmed for each output relay.

Heating Mode Setpoint and Differential

In heating mode, the differential is below the setpoint. The relay de-energizes when the temperature rises to the setpoint. As the temperature drops to the setpoint minus the differential, the relay energizes.

Cooling Mode Setpoint and Differential

In cooling mode, the differential is above the setpoint. The relay de-energizes when the temperature falls to the setpoint. As the temperature rises to the setpoint plus the differential, the relay energizes.



and  arrow

62-0257—13 10

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

M24297A

THROTTLING RANGE

STAGE 2 ON

STAGE 3 ON

STAGE 1 ON

-25%

STAGES

HYST.

75%

205°F 185°F

200°F

25%

195°F

STAGE 4 ON

50%

190°F

STAGE 1

STAGE 2

STAGE 3

STAGE 4

STAGE ENERGIZES STAGE DE-ENERGIZES

Setpoint High Limit

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, , and  buttons and continue to press all three buttons for five seconds to set the setpoint high limit maximum to this value.

NOTE: You must press all three buttons at exactly

the same time for this action to occur.

IMPORTANT

1. This action sets the maximum setpoint value of all outputs to the setpoint high limit maximum.

2. Setting the high limit setpoint maximum is irre- versible. If you perform the action inadvertently and this setpoint adversely affects the control of your system, you must replace the controller.

Staged Operation

Staging occurs as illustrated in Fig. 18 for a Heat setpoint of 200°F and a throttling range of 20°F when the Integral value is zero (0). When the Integral is not zero, then the actual temperatures at which stages energize and deenergize will vary from this example; see “1.3.4.2. INTEGRAL” on page 18.

NOTE: A non-zero integral causes the control to

move toward the setpoint value.

Fig. 18. Staging Behavior

(when effective Setpoint = 200°F).

Programming the T775L Controller

In addition to the two staged loops, up to two additional relays can be available for independent on-off control. Examples of Loop and Relay configurations are:

• Number of relays = 8. Loop 1 uses relays 1-3, and

• Number of relays = 11. Loop 1 uses relays 1-5, and

• Number of relays = 12. Loop 1 uses relays 1-4, and

Loop 2 uses relays 4-6. The remaining two relays (7 and 8) are available for use.

Loop 2 uses relays 6-10. The remaining relay (11) is available for use.

Loop 2 uses relays 5-8. Relays 9 and 10 are available for use, but in this case, relays 11 and 12 are not usable.

• Number of relays = 8. Loop 1 uses relays 1-6, and Loop 2 uses relays 7-8. There are no additional relays available for use.

IMPORTANT

If you change the number of relays, the controller resets the number of relays per loop to zero (0) for all loops. You must use Setup mode to reconfigure all loops and additional relays. See page 11.

To program the controller, perform the setup configuration (see “1. Setup”) and then select one of the following procedures depending on whether the Reset function is to be used:

• Program the Outputs for No Reset — see “2. Programming Output (Loops and Additional Relays) with No Reset” on page 22.

• Program the Outputs for Reset — see “” on page 25.

When programming is complete, you may continue with “4. Scheduling” on page 31.

1. SETUP

Setup provides the ability to change the factory default settings for the temperature sensors and outputs, to enable/disable reset control, and to enable/disable scheduling.

IMPORTANT

If you change the number of relays, the controller resets the number of relays per loop to zero (0) for all loops. You must use Setup mode to reconfigure all loops and additional relays.

NOTE: The T775L controller interface is intuitive.

You may want to use this procedure simply as a reference to locate the particular option or parameter of interest.

NOTES:

1. If you press the HOME button or there is no keypad activity for four minutes, you exit Setup mode and return to the home screen.

2. If you press the MENU button, you exit Setup mode and go to the Program menu.

Once in Setup mode, you use the —

• Left arrow button() to scroll backward through the

Setup menus

• Right arrow button () to select the highlighted menu

item and display its content

• Up and Down arrow buttons ( and ) to scroll up

and down through a list of items or to increase or decrease the value of a displayed setup parameter

Setup Procedure

The Setup process uses a hierarchical menu structure that is easy to use. You press the  and  arrow buttons to move forward and backward through the menus.

NOTE: The menus can display only those relays that

are defined in Setup (see “1.3.1. Number of RELAYS” on page 14). For example, if you configure only two relays, then only two relays display on the appropriate menus.

11 62-0257—13

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER

SETUP SENSORS

SENSOR A

SETUP

SENSORS

SENSOR A

UNITS

CALIBRATE LABEL EXIT

M24430

To change the controller’s sensors and output setup parameters, perform the following procedures in the order listed:

1. Enter Setup mode — see “Entering Setup Mode”.

2. Setup Sensors — see “1. Setting up the Sensors”.

3. Setup Outputs — see “1.3. Setting up the Outputs”

on page 14.

4. Exit Setup Mode — see “1.4. Exiting Setup” on page 22.

SETUP

SENSORS

SETUP

SENSORS

# SENSORS

SENSOR A SENSOR B EXIT

M24428

Fig. 19. Setup - Sensors Menu.

SETUP SENSORS

# SENSORS

SETUP

SENSORS

# SENSORS

ENTER

NUMBER OF

SENSORS

Fig. 20. Setup - Sensors - Number of Sensors.

M24429

Entering Setup Mode

To enter Setup mode, press and hold the MENU button for five seconds to display the Setup menu. See Fig. 17 on page 10.

1. Setting up the Sensors

1. From the Setup menu, use the  and  buttons to

highlight SENSORS.

2. Press the  button to display the Sensors menu.

1.1. Number of SENSORS

The value entered here determines the number of sensors displayed on the home screen.

1. From the Sensors menu, highlight # SENSORS

then press the  button to display the number of sensors.

2. Use the  and  buttons to enter the number of

sensors (1 or 2).

Default: 2

3. Press the  button to accept the value and display

the SENSOR A selection.

Fig. 21. Setup - Sensors - Sensor A Menu.

62-0257—13 12

1.1.1. SENSOR A

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.

1. From the Sensors menu, highlight SENSOR A.

2. Press the  button to display the Sensor A selec-

tions.

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