Honeywell T775U User Manual

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				SPDT		Analog			Nbr of
			Output	Relay		(Mod)	b	Sensor	Sensors
a	Description	Replaces				Outputs				Enclosure
Model			Reset	Outputs				Inputs	Included
T775U2006		H775A1006	Yes	2		2		2d	None	NEMA 1
		H775A1022
	Universal:	H775A1048
		H775A1063
	Humidity,	H775B1005
	Pressure,	H775C1004c
	Temperature,	H775D1003c
	etc.	H775E1002c
T775U2016		N/A	Yes	2		2		2e	None	NEMA 1

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

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

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

dFor 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 T775U2001.

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

E4436

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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)

Universal Sensors (Sensor A only)

The controller accepts 0-5 Vdc, 0-10 Vdc or 4-20 mA input for temperature, pressure, humidity CO2, etc. They may 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. From the home page 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

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 starting with Series 3 (March 2009). Series 3 can be identified by the sideways 3 after the part number on the device label.

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 CO2 sensors and is settable in PPM units.

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.

aSee form 62-0265 – Temperature Sensors for the T775 Series 2000 Stand-alone Controller

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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

Controller Dimensions

1 (25.5)						TOP

7/8 (22.5)

2 15/16 (74)

		4 13/32 (112.1)	1/2 (12.4)
	LEFT	3 31/32 (101)	RIGHT
4 1/16 (103.4)
1/64 (3.8)
		8 5/32
		(207.1)
4 1/16 (103.4)		7 23/32
		(196)	2 13/16 (71.8)
2 11/16 (68.1)
7/8 (22.5)		FRONT VIEW	7/8 (22.5)

7/8 (22.5)

											M24546
1 (25.5)							BOTTOM

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

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.

6.Programming the Controller with no Reset – see page 25 or

Programming the Controller with Reset – page 28.

7.Scheduling (optional)— see page 33.

Additional topics are:

•Sensor calibration begins on page 10.

•Interface overview begins on page 11.

•Summary menu begins on page 37.

•Troubleshooting begins on page 37.

MOUNTING

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

Controller Mounting

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.

4.Interface and Programming overview – see page 11.

5.Setup – see page 13.

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.

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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

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.

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.

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.

SENSOR	USE HEAT
PLACED	CONDUCTIVE
IN WELL	COMPOUND
1/2 NPT	IMMERSION
	WELL
	M24379

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.

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Temperature Sensor Wiring

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.

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 parallelseries wired must be of the n2 power (for example, 4, 9, 16, etc.). See Fig. 3.

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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

Temperature Sensor Wire Type and Size

SENSORS				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 10 for
				wire size selection where cable runs are longer than
				25 feet.

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

M24548

Fig. 3. Parallel-series wiring of sensors.

			SHIELDED
			CABLE
	T	SENSOR A	NOTE: SHIELDED CABLE MUST BE
	T
	T	1	CONNECTED TO A SEPARATE EARTH
		SENSOR B	GROUND.
	T		HOWEVER, DO NOT GROUND
		2	SHIELDED CABLE AT SENSOR END.

SHIELDED

CABLE

SENSOR

NOTE: TO MINIMIZE NOISE PICKUP,

MAKE SENSOR CONNECTION FROM

SHIELDED CABLE AS CLOSE AS

POSSIBLE TO SENSOR BODY.

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

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

M24549A

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 3- wire 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:

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.

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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

C

S

SENSOR A

V

1

T SENSOR B T

SHIELDED CABLE

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.

S	C	V	EXAMPLE OF
VO	GND	VIN	H76XX HUMIDITY
			SENSOR;
			0-10 VDC
			CONNECTION

1THE 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.

M24550

C

S

V SENSOR A

T SENSOR B T

SHIELDED CABLE

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.

		S	C
EXAMPLE OF
P7640A
PRESSURE	PWR	OUT	COM
SENSOR;
0-10 VDC
CONNECTION

L1

(HOT)

24 VAC

L2

M24551

Fig. 5. Sensor Wiring — 3-wire shielded cable connection from Sensor A to 0-10 Vdc sensor (H76xx humidity sensor shown).

SHIELDED CABLE 1

	C 3
	S	SENSOR A
	V

T SENSOR B

T

2

V	S
PWR	OUT	COM

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

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

3THE 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.

M24890C

Fig. 6. Sensor Wiring — 2-wire shielded cable connection from 4-20 mA sensor to

T775 controller (loop powered wiring).

Fig. 7. Sensor Wiring — 2-wire shielded cable connection from Sensor A to a 0-10 Vdc sensor using separate transformer.

EXAMPLE OF P7640A 4-20 MA SENSOR CONNECTION

PWR OUT COM ZERO

		12-30 VDC
SHIELDED CABLE	S	POWER SUPPLY
		+
		–
		C
C
S	SENSOR A
V
T	SENSOR B
T
		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

Fig. 8. Sensor Wiring — 2-wire 4-20mA sensor input to T775 controller using a separate (Vdc only) transformer.

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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

Controller Wiring

WARNING

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.

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.

CAUTION

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

CAUTION

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.

CAUTION

Equipment Damage Hazard.

Electrostatic discharge can short equipment circuitry.

Ensure that you are properly grounded before handling the unit.

	1
W	C +
	2

1NO HIGH VOLTAGE. CLASS 2 WIRING ONLY.

2EARTH GROUND TERMINAL MUST BE CONNECTED TO CONDUIT CLAMP LOCALLY.

M24296

Fig. 9. Earth Ground.

IMPORTANT

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.

IMPORTANT

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

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 inserted 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	1/2 (13)
ONE TERMINAL.

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 blocks.

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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. 18 beginning on page 9 for typical T775U wiring applications.

Fig. 11. T775U Terminal and Feature Locations.

KNOCKOUT A
		B	C – T		SENSOR A
	MOD 1		S + T
					1
		R –	V
	2	W +	T		SENSOR B
	MOD 2	B	T
		R –
		W +
	DIGITAL	–
		+
	INPUT
KNOCKOUT B
3	POWER	C +
	24 VAC
			120	COM 240	POWER
					120/240 VAC
	OUTPUT	NO	NO		OUTPUT
					RELAY 2
	RELAY 1	C	C
		NC	NC
KNOCKOUT C					KNOCKOUT D

KNOCKOUT E

1WHEN USED FOR TEMPERATURE OR 4-20mA SENSING, SENSORS A AND B USE THE TWO TT CONNECTIONS AND ARE POLARITY INSENSITIVE.

2FOR 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.

3A SEPARATE EARTH GROUND IS REQUIRED FOR ANY POWER SOURCE (24, 120, OR 240 VAC)

M24553A

Table 2. Description of Wiring Terminal Connections.

	Terminal
Connection	Label	Description
		Sensors
	C – common	0-10 Vdc input: Universal
	S – signal	sensor for humidity, pressure,
Sensor Aa	V – voltage	temperature, etc.
	S and V	4-20mA input; see Fig. 7 on
		page 6
	T T	Temperature Sensor; polarity
		insensitive
Sensor B	T T	Temperature Sensor; polarity
		insensitive

		Input
DI	+ -		Digital Input (dry contact)
			Outputs
Relay 1	NO / COM /
	NC		120-240 Vac Relay Output
Relay 2

Connection	Terminal Label	Description
	Outputs
Mod 1	+ - (Vdc or mA)	Modulating Output
Mod 2	W R B (Series 90)b
	24 Vac Power
24V +	+	24 Vac Hot
Common	-	24 Vac Common
Ground		Earth Groundc
	120 or 240 Vac Power
120 Vac	120	120 Vac Power
Common	COM	Common
240 Vac	240	240 Vac Power

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

bFor Series 90 connections, you must insert a 340 Ohm resistor across terminals R and W. See Fig. 17 on page 10. The resistor is included with the controller.

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

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8

T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

WIRING APPLICATION EXAMPLES

Fig. 12 – 18 illustrate typical controller wiring for various applications.

NOTE: The electronic Series 90 output provided with modulating T775 models can not drive electromechanical 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).

1

L1
(HOT)
24 VAC
L2
		C +
LOAD 1
	NO	NO
	COM
		C
LOAD 2
		NC

C – T

S + T

V

NO

C

NC

C – T

1 S + T

V

	C +			120V
				COM
		120	COM 240	2
NO	NO	NO
COM				NO
	C	C			LOAD 2
	NC	NC		COM

LOAD 1

1FOR SPECIFIC SENSOR WIRING (TEMPERATURE, HUMIDITY, PRESSURE, ETC), REFER TO THE SENSOR WIRING SECTIONS BEGINNING ON PAGE 4.

2 FOR 240 VAC LOAD, CONNECT TO 240 TERMINAL.

M24555A

Fig. 14. Wiring for Two-stage Control with 120 or 240 Vac (120 Vac Input and 120 Vac Load).

COM

NO

1FOR SPECIFIC SENSOR WIRING (TEMPERATURE, HUMIDITY, PRESSURE, ETC), REFER TO THE SENSOR WIRING SECTIONS

BEGINNING ON PAGE 4.	M24554A

DIGITAL INPUT

– +

M24559

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

HONEYWELL MODUTROL MOTOR WITH 4-20 mA MODULATING INPUT

T1 T2 – +

POWER

OUTPUT

1				B
				R –
MODULATING OUTPUT				W +
				B
TERMINAL (MOD 1)				R –
				W +

1 USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.

M24557A

Fig. 13. Wiring for mod motor or direct coupled actuator with 4 to 20 mA control input.

Fig. 15. Wiring for Digital Input (dry contact).

HONEYWELL MODUTROL MOTOR WITH

VOLTAGE CONTROL INPUT

+ –
T1 T2 C R F
1 POWER
OUTPUT
	B
	R –
	W +
MODULATING OUTPUT	B
TERMINAL (MOD 1)	R –
	W +

1 USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.

M24558A

Fig. 16. Wiring for mod motor or direct coupled actuator with 0-10 Vdc control input.

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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

HONEYWELL ELECTRONIC

SERIES 90 MODUTROL MOTOR

T1 T2 B R W			1

POWER
OUTPUT
2	B
	R –	3
	W +
MODULATING	B
OUTPUT	R –
TERMINAL
(MOD 1)	W +

1TO 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

2USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.

3INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.

M24560A

Fig. 17. Wiring for Series 90 Modutrol Motor Control.

HONEYWELL	MINIMUM POSITION		SPDT CHANGEOVER
ELECTRONIC SERIES 90	POTENTIOMETER
MODUTROL MOTOR	(Q209)		(H205 OR H705)
T1 T2 B R W	W R	B
		2
1 POWER
OUTPUT	B
	R –
	W +
MODULATING OUTPUT	B	3
TERMINAL (MOD 1)	R –
	W +

1USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.

2A 250 OHM RESISTOR PROVIDES 40% AUTHORITY WHEN USING A 150 OHM MINIMUM POSITION POTENTIOMETER.

3INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.

M24561A

Fig. 18. Wiring for Changeover Relay and Minimum Position Potentiometer used with Series 90 Modutrol Motors.

CHECKOUT

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

WARNING

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.

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 Table 3.

Table 3. Calibration Range Examples.

	Min.	Max.	Min-Max
Units	Value	Value	Range	Calibration
	Example	Example	Result	Range
PSI	100	400	300	± 30 PSI
Inches	-20.0	20.0	40	± 4 in. W.C.
W.C.
Pa or	-2,000	3000	5000	± 500 Pa/kPa
kPa
%	10	100	90	± 9%

The calibration value is set in section “1.2.2.3. CALIBRATE (Sensor A or B)” on page 16.

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 16 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).

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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

Table 4. Temperature Sensor Calibration for Resistance Loss due to Wire Length.

		Temperature Offset in
AWG			°F (Feet)a
Rating	mΩ/ft	200 ft	500 ft		1,000 ft
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
22	16.1	2.92	7.32		14.64
		Temperature Offset in
AWG			°C (Meter)a
Rating	mΩ/m	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

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

Fig. 19 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).

RESISTANCE (OHMS)

1489

1403

1317

1231

1145

1059		1097 ± 0.08 OHMS
		AT 77°F (25°C)

973	1
887

801

-40			-20		0		20		40		60		80			100		120		140		160		180		200		220			250 °F
-40			-30		-20		-10		0		10		20 30			40		50		60		70		80		90		100 110			120 °C

TEMPERATURE (DEGREES)

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

M24304

Fig. 19. 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.

HOME

RELAYS 1 2 MENU AREA

ON

SENSORS
SENSOR A
78	oF
SENSOR B
84	oF
		DATA AREA
MOD1	40%
MOD2	60%	LOCK ICON
DI ON
home	menu
		6 BUTTON KEYPAD
		M24563

Fig. 20. 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. 20 and Fig. 21.

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 (W and X)

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

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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER

Up and Down Arrow Buttons (S and T)

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

•When the desired item is highlighted, you press the X 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.

Program, Schedule, and Summary Menus

To access these menus from the home screen, press the MENU button. See Fig. 22.

MENU DISPLAY WHEN	MENU DISPLAY WHEN
SCHEDULING IS SET	SCHEDULING IS NOT SET

NOTE: Once you select an item from a list or enter a value, pressing the W or X 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. 21.

Active relays are indicated by the small black square ( ) just below the relay number. Fig. 21 shows the home screen with relay 2 energized.

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

HOME

HOME

HOME

RELAYS 1 2

RELAYS 1 2

RELAYS 1 2

ON

ON

ON

SENSORS

MOD 1

40%

REL 2

ON

SENSOR A

COOL

HEAT

78

oF

SETPOINT

SETPOINT

SENSOR B

74

oF

60

oF

84

oF

SENSOR A

SENSOR A

62

oF

62

oF

RT 12345 HRS

MOD1

40%

MOD1

40%

MOD1

40%

MOD2

60%

MOD2

60%

MOD2

60%

DI ON

DI ON

DI ON

M24564

Fig. 21. 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 W or X 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.

HOME
RELAYS 1 2
ON				MENU		MENU
SENSORS				PROGRAM		PROGRAM
SENSOR A
78		oF		SCHEDULE		EXIT
				SUMMARY
SENSOR B				EXIT
84		oF
MOD1		40%
MOD2		60%
DI ON

home menu OR

M24565

Fig. 22. Menus.

Depending on whether scheduling is enabled or not, the LCD displays one of two menus as shown in Fig. 22. Scheduling is enabled from the Setup menu’s Output settings (see “1.3.3.1. USE SCHED” on page 21).

Setup Menu

To access the Setup menu, press and hold the MENU button for five seconds. See Fig. 23.

HOME

RELAYS 1 2

ON

SETUP

SENSORS

SENSORS

SENSOR A

78

oF

OUTPUTS

EXIT

SENSOR B

84

oF

MOD1

40%

MOD2

60%

DI ON

menu

FIVE

home

SECONDS

M24566

Fig. 23. Setup Menu.

Using the Menus

When you are working with the menus, use the:

•Left arrow button (W) to scroll backward through the menus

Accessing the Menus

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

•Right arrow button (X) to select the highlighted menu item and display its content

•Up and Down arrow buttons (S and T) to scroll up and down through a list of items or to increase or decrease the value of a displayed parameter

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