Honeywell T775B Installation guide

E4436
INSTALLATION INSTRUCTIONS
62-0254-03
T775A/B/M Series 2000 Electronic
Stand-Alone Controllers
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.
Five models have analog (modulating) outputs for
actuator and motor control, and NEMA-4 weatherproof
enclosures are available for wet environments.
IMPORTANT
Each T775A/B/M controller 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. T775A/B/M Controller Configurations.
Controller
Modela
aAll models include a digital input for use with the disable or setback option.
Description Replaces
SPDT
Relay
Outputs
Analog
(Mod)
Outputsb
bThe modulating (analog) outputs are 4-20 mA, 0-10 Vdc, 2-10 Vdc, or Series 90 selectable.
Floating
Outputsc
cEach floating output eliminates two SPDT relays.
Sensor
Inputs
Nbr of
Sensors
Included Enclosure
T775A2009 Standard T775A1001 1 None None 1 1 NEMA 1
T775B2016 Standard N/A 2 None 1 2 1 NEMA 4X
T775B2024 Standard T775C1009 T775D1008 4 None 2 2 1 NEMA 4X
T775B2032 Standard T775A1019 T775B1000 2 None 1 2 1 NEMA 1
T775B2040 Standard T775A1027 T775A1035
T775B1018 T775B1026
T775B1042
4None 2 2 1NEMA1
T775M2006 Modulating N/A None 2 N/A 2 1 NEMA 1
T775M2014 Modulating T775G1005 T775G1013
T775G1021 T775G1039
42N/A
2d
dThese models can support a high/low modulating limit at Sensor B for temperature control at Sensor A.
1 NEMA 4X
T775M2022 Modulating N/A 2 2 N/A 2d1 NEMA 4X
T775M2030 Modulating T775E1114 T775F1022
T775F1055 T775F1089
42N/A
2d1 NEMA 1
T775M2048 Modulating T775E1015 T775E1023
T775E1056 T775E1064
T775E1098
22N/A
2d1 NEMA 1

T775A/B/M SERIES 2000 CONTROLLER PRODUCT DESCRIPTION
62-0254–03 2
Temperature Sensorsa
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
Accessories
• 107324A – Bulb Holder, duct insertion
• 107408 – Heat Conductive Compound, 4 ounce
• 50001774-001 – Immersion Well, stainless steel 304,
1/2 in. threading
Controller Dimensions
Fig. 1. T775A/B/M dimensions in inches (mm).
aSee form 62-0265 – Temperature Sensors for the T775
Series 2000 Stand-alone Controller
4 13/32 (112.1) 1/2 (12.4)
3 31/32 (101)
7 23/32
(196)
8 5/32
(207.1)
2 15/16 (74)
7/8 (22.5)
1 (25.5)
4 1/16 (103.4)
4 1/16 (103.4)
1/64 (3.8)
2 11/16 (68.1)
7/8 (22.5)
2 13/16 (71.8)
7/8 (22.5)
1 (25.5)
7/8 (22.5)
M24279
TOP
BOTTOM
LEFT RIGHT
FRONT VIEW

BEFORE INSTALLATION T775A/B/M SERIES 2000 CONTROLLER
3 62-0254–03
BEFORE INSTALLATION
Review the “Specifications” on page 35 before
installing the controller.
When Installing This Product
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check ratings given in instructions and on the prod-
uct to ensure the product is suitable for your appli-
cation.
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.
4. Programming — see page 13.
5. Scheduling (optional) — see page 30.
Additional topics are:
• Temperature sensor calibration begins on page 10.
• Interface overview begins on page 11.
• Setup (for advanced options) begins on page 17.
• Summary menu begins on page 34.
• Troubleshooting begins on page 34.
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.
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.
NEMA 4 Enclosure Mounting
For models with NEMA 4 enclosures, ensure that
waterproof wire/conduit fittings are used at the knockouts
for all wiring attachments. See Fig. 7 on page 6 for
knockout locations.
IMPORTANT
For NEMA 4 enclosures, be sure to cover and
seal all unused open knockouts.
Temperature Sensor(s) Mounting and
Location
Temperature sensors may be located up to 1,000 feet
(304 m) from the T775A/B/M controller. See Table 3 on
page 10 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.
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.
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 T775A/B/M controller wiring.
SENSOR
PLACED
IN WELL
IMMERSION
WELL
1/2 NPT
USE HEAT
CONDUCTIVE
COMPOUND
M24470

T775A/B/M SERIES 2000 CONTROLLER WIRING
62-0254–03 4
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
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.
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 n2power (for example, 4, 9,
16, etc.). See Fig. 3.
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 10 for
wire size selection where cable runs are longer than 25
feet.
Fig. 4. Sensor wiring — showing shielded cable connection to Sensor A.
TO T775 CONNECTIONS (SENSOR A) OR (SENSOR B).
SENSORS
M24471
M24472
SHIELDED
CABLE
SHIELDED
CABLE
SENSOR
SENSOR AAND SENSOR B TERMINAL WIRING IS POLARITY INSENSITIVE.
1
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.
T
T
T
T
SENSOR A
SENSOR B
1

WIRING T775A/B/M SERIES 2000 CONTROLLER
5 62-0254–03
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.
CAUTION
Do not use 24 Vac power to power any external
loads if 120 Vac or 240 Vac is used to power
the T775A/B/M controller.
CAUTION
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.
CAUTION
Equipment Damage Hazard.
Electrostatic discharge can short equipment
circuitry.
Ensure that you are properly grounded before
handling the unit.
Fig. 5. 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 T775A/B/M control-
ler (24 Vac or 120 Vac or 240 Vac).
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 inserted into one ter-
minal 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 tighten-
ing the screw.
5. Pull on each wire in all terminals to check for good
mechanical connection.
Fig. 6. Attaching two or more wires at terminal blocks.
C
+
W
1
2
M24296
NO HIGH VOLTAGE. CLASS 2 WIRING ONLY.
EARTH GROUND TERMINAL MUST BE CONNECTED
TO CONDUIT CLAMP LOCALLY.
1
2
1/2 (13)
1. STRIP 1/2 IN. (13 MM)
FROM WIRES TO
BE ATTACHED AT
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.
M24473

T775A/B/M SERIES 2000 CONTROLLER WIRING APPLICATIONS (EXAMPLES)
62-0254–03 6
Controller Wiring Details
The wiring connection terminals are shown in Fig. 7 and
are described in Table 2.
See Fig. 8 – Fig. 20 beginning on page 6 for typical
T775A/B/M wiring applications.
Fig. 7. T775A/B/M terminal and feature locations.
NOTE: Refer to Table 1 on page 1 for the specific con-
figuration of sensors and outputs supported by
the model you are installing.
NOTE: For NEMA 4 enclosures, use waterproof fittings
for wiring/conduit connections at knockouts.
WIRING APPLICATIONS
(EXAMPLES)
Fig. 8 – 20 illustrate typical controller wiring for various
applications.
Fig. 8. Wiring for two-stage control – 24 Vac input and
24 Vac load.
Table 2. Description of Wiring
Terminal Connections.
Connection Terminal Label Description
Sensors
Sensor A T T Temperature Sensor;
polarity insensitive
Sensor B
Outputs
Relay 1
Relay 2
Relay 3
Relay 4
NO
COM
NC
120-240 Vac Relay
Output
Mod 1 + - (Vdc or mA)
W R B (Series 90)aModulating Output
Mod 2
M24474
C
NO
NC
C
NO
NC
C
NC
NO
C
NC
NO
T
T
T
T
B
R
W+
–
+
–
B
R
W+
–
SENSOR A
SENSOR B
MOD 2
MOD 1
KNOCKOUT A
DIGITAL
INPUT
POWER
120/240 VAC
OUTPUT
RELAY 2
KNOCKOUT D
POWER
24 VAC
OUTPUT
RELAY 1
KNOCKOUT C
KNOCKOUT E
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).
1
2
1
2
OUTPUT
RELAY 3
KNOCKOUT B
OUTPUT
RELAY 4
3
3C+
120
COM
240
Input
DI + - Digital Input (dry
contact)
24 Vac Power
24V + + 24 Vac Hot
Common C 24 Vac Common
Ground Earth Groundb
120 or 240 Vac Power
120 Vac 120 120 Vac Power
Common COM Common
240 Vac 240 240 Vac Power
aFor Series 90 connections, you must insert a 340 Ohm
resistor across terminals R and W. See Fig. 17 on
page 8. The resistor is included with the controller.
bA separate earth ground is required for all installations
regardless of the power source (24, 120, or 240 Vac).
See Fig. 5 on page 5.
Table 2. Description of Wiring
Terminal Connections. (Continued)
Connection Terminal Label Description
L1
(HOT)
L2
24 VAC
COM
NO
COM
NO
M24475A
LOAD 2
LOAD 1
SENSOR A
C
NO
NC
C
NO
NC
T
T
C+

WIRING APPLICATIONS (EXAMPLES) T775A/B/M SERIES 2000 CONTROLLER
7 62-0254–03
Fig. 9. Wiring for four-stage control – 24 Vac input
and 24 Vac load.
Fig. 10. Wiring for two-stage control with 120 or 240
Vac (120 Vac input and 120 Vac load shown).
Fig. 11. Wiring for four-stage control with 120 or 240
Vac (120 Vac input and 120 Vac load shown).
Fig. 12. Wiring for floating output (Relay 1 and Relay 2
pair shown).
L1
(HOT)
L2
24 VAC
M24476
A
SENSOR A
C
NO
NC
C
NO
NC
C
NC
NO
C
NC
NO
T
T
COM
LOAD
4
NO
LOAD
3
LOAD
2
LOAD
1
C+
COM
NO
COM
NO
COM
NO
SENSOR A
C
NO
NC
C
NO
NC
T
T
COM
LOAD 2
LOAD 1
NO
COM
NO
COM
120V
M24477A
1
1FOR 240 VAC LOAD, CONNECT TO 240 TERMINAL.
C+
120
COM
240
POWER SUPPLY
L1 (H OT )
L2
SENSOR A
1FOR 240 VAC LOAD, CONNECT TO 240 TERMINAL.
C
NO
NC
C
NO
NC
C
NC
NO
C
NC
NO
T
T
COM
120V
1
M24478A
LOAD 1
LOAD
3
LOAD
2
COM
NO
LOAD 4
C+
120
COM
240
COM
NO
C
NO
NC
C
NO
NC
BARCODE
M24479
CLOSE RELAY TO DRIVE DEVICE OPEN. RELAY 1 SHOWN.
(RELAYS 1 AND 3 ARE USED FOR OPEN).
CLOSE RELAY TO DRIVE DEVICE CLOSED. RELAY 2 SHOWN.
(RELAYS 2 AND 4 ARE USED FOR CLOSE).
THE RELAYS MUST BE WIRED IN PAIRS WITH RELAYS 1 AND 2
BEING THE FIRST PAIR, AND RELAYS 3 AND 4 BEING THE SECOND PAIR.
12
1
2
120/240 VAC LINE
OPEN
DEVICE
COM
CLOSE
NO
COM
NO
COM

T775A/B/M SERIES 2000 CONTROLLER WIRING APPLICATIONS (EXAMPLES)
62-0254–03 8
Fig. 13. Wiring for ML7984 valve actuator.
Fig. 14. Wiring for Digital Input (dry contact).
Fig. 15. Wiring for mod motor or direct coupled
actuator with 4 to 20 mA control input.
Fig. 16. Wiring for mod motor or direct coupled
actuator with 0 to 10 Vdc control input.
Fig. 17. Wiring for Series 90 Modutrol Motor Control.
Fig. 18. Wiring for changeover relay and
minimum position potentiometer used
with Series 90 Modutrol Motors.
USE SEPARATE TRANSFORMER FOR T775R WHEN USING 24 VAC.
250 OHM RESISTOR
1
2
M24480
MODULATING OUTPUT
TERMINAL (MOD 1)
B
R
W+
–
B
R
W+
–
T1 T2 B WR
POWER
OUTPUT
ML7984 ACTUATOR
1
2
M24482
DIGITAL
INPUT
+
–
USE SEPARATE TRANSFORMER FOR T775R WHEN USING 24 VAC.
1
M24481
MODULATING OUTPUT
TERMINAL (MOD 1)
B
R
W+
–
B
R
W+
–
POWER
OUTPUT
1
T1 T2 – +
HONEYWELL MODUTROL MOTOR WITH
4-20 mA MODULATING INPUT
T1 T2 C R
POWER
OUTPUT
USE SEPARATE TRANSFORMER FOR T775R WHEN USING 24 VAC.
1
HONEYWELL MODUTROL MOTOR WITH
VOLTAGE CONTROL INPUT
1
F
M24483
MODULATING OUTPUT
TERMINAL (MOD 1)
B
R
W+
–
B
R
W+
–
M24484
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 T775R WHEN USING 24 VAC.
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.
1
2
3
MODULATING
OUTPUT
TERMINAL
(MOD 1)
B
R
W+
–
B
R
W+
–
T1 T2 B WR
POWER
OUTPUT
HONEYWELL ELECTRONIC
SERIES 90 MODUTROL MOTOR
1
2
3
M24485
USE SEPARATE TRANSFORMER FOR T775R WHEN USING 24 VAC.
A 250 OHM RESISTOR PROVIDES 40% AUTHORITY WHEN
USING A 150 OHM MINIMUM POSITION POTENTIOMETER.
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.
1
2
MODULATING OUTPUT
TERMINAL (MOD 1)
B
R
W+
–
B
R
W+
–
T1 T2 B WR
POWER
OUTPUT
2
HONEYWELL
ELECTRONIC SERIES 90
MODUTROL MOTOR
1
W R B
MINIMUM POSITION
POTENTIOMETER
(Q209)
SPDT CHANGEOVER
(H205 OR H705)
3
3

WIRING APPLICATIONS (EXAMPLES) T775A/B/M SERIES 2000 CONTROLLER
9 62-0254–03
Fig. 19. Wiring for three Series 90 Modutrol Motors.
Fig. 20. Wiring for unison control of M9184 or M9185 Modutrol IV Motor using one minimum position
potentiometer for all motors.
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
USE A 1300 OHM RESISTOR FOR TWO MOTORS, 910 OHM RESISTOR FOR THREE MOTORS.
THE 407EAU RESISTOR KIT, WHICH IS SHIPPED WITH THE M9184 AND M9185 MOTORS,
INCLUDES BOTH RESISTORS.
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.
1
2
1
2
M9184 OR M9185
MODUTROL MOTOR
W
R
B
TR
TR
W
R
B
TR
TR
W
R
B
TR
TR
M9184 OR M9185
MODUTROL MOTOR
M9184 OR M9185
MODUTROL MOTOR
L1
(HOT) L2
M24486
MODULATING OUTPUT
TERMINAL (MOD 1)
B
R
W+
–
B
R
W+
–
3
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
UP TO SIX SIMILAR MOTORS CAN BE CONNECTED IN UNISON.
USE RESISTOR BETWEEN R AND B ON THE MOD 1 TERMINAL: 1300 OHMS FOR TWO MOTORS; 910 OHMS FOR THREE MOTORS (4074EAU KIT).
IF COMMON TRANSFORMER IS USED, ALL MOTORS MUST BE IN PHASE. CONNECT THE SAME TRANSFORMER LEAD TO T1 ON EACH MOTOR,
CONNECT THE OTHER TRANSFORMER LEAD TO T2 ON EACH MOTOR.
USE TEMPERATURE CONTROLLER SUCH AS H205 OR H705, OR T675A FOR CHANGEOVER CONTROL.
AUTHORITY OF MINIMUM POSITION POTENTIOMETER, IF USED, INCREASES WITH THE NUMBER OF MOTORS IN PARALLEL. WITH ONE MOTOR,
50% STROKE; WITH TWO MOTORS, 100% STROKE; WITH THREE MOTORS, 100% STROKE WITH 1/3 OF FULL POTENTIOMETER ROTATION.
REVERSING THE B AND W TERMINALS ON ONE OR MORE MOTORS WILL NOT AFFECT CONTROL PERFORMANCE ON THE OTHER MOTORS.
THE SYSTEM CAN BE CONFIGURED TO HAVE SOME MOTORS BE REVERSE ACTING AND OTHER MOTORS BE DIRECT ACTING.
USE SEPARATE TRANSFORMER FOR T775 WHEN POWERING FROM 24 VAC.
THE SYSTEM IS SHOWN CONNECTED FOR COOLING. FOR HEATING, REVERSE THE W AND B LEADS OF THE MODULATING OUTPUT ON THE
T775 CONTROLLER.
1
1
2
M9184 OR M9185
MODUTROL MOTOR
W
R
B
TR
TR
W
R
B
TR
TR
W
R
B
TR
TR
M9184 OR M9185
MODUTROL MOTOR
M9184 OR M9185
MODUTROL MOTOR
L1 (HOT) L2
W
R
B
MINIMUM
POSITION
POTENTIOMETER
(Q209/S963)
1
2
3
W
B
R
CHANGEOVER
CONTROLLER
64
2
2
2
5
7
3
9
6
4
5
7
3
8
9
M24487
MODULATING OUTPUT TERMINAL (MOD 1)
B
R
W+
–
+
–
B
R
W+
–
POWER
24 VAC
8
C+

T775A/B/M SERIES 2000 CONTROLLER CHECKOUT
62-0254–03 10
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 installed 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 cal-
ibrate for wire loss within the limits of the control-
ler.
See “2.2.2.2. CALIBRATE (the sensor)” on page 18 for
the instructions to enter the calibration value.
Fig. 21 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. 21. Sensor Resistance vs. Temperature.
Table 3. Temperature Sensor Calibration for
Resistance Loss due to Wire Length.
AWG
Rating mΩ/ft
Temperature Offset in
°F (Foot)a
aThis is the distance from the controller to the sensor
(already accounts for round trip distance).
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
AWG
Rating mΩ/m
Temperature Offset in
°C (Meter)a
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
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
1
1