Honeywell Air Conditioner 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.  
Analog  
(Mod)  
SPDT  
Output Relay  
Nbr of  
Sensor Sensors  
Controller  
a
b
Model  
Description  
Replaces  
Reset Outputs Outputs Inputs Included Enclosure  
d
T775U2006  
H775A1006  
H775A1022  
H775A1048  
H775A1063  
H775B1005  
Yes  
2
2
None  
NEMA 1  
2
Universal:  
Humidity,  
Pressure,  
Temperature,  
etc.  
c
H775C1004  
H775D1003  
c
c
H775E1002  
N/A  
e
T775U2016  
Yes  
2
2
None  
NEMA 1  
2
a
The T775U includes a digital input for use with the disable or setback option.  
b
c
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.  
d
e
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 T775U2001.  
The T775U2016 can control Sensor A (universal) and Sensor B (temperature) independently, like other standard  
T775 controllers.  
E4436  
62-0255-07  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
Controller Dimensions  
TOP  
1 (25.5)  
7/8 (22.5)  
2 15/16 (74)  
4 13/32 (112.1)  
3 31/32 (101)  
1/2 (12.4)  
LEFT  
RIGHT  
4 1/16 (103.4)  
1/64 (3.8)  
8 5/32  
(207.1)  
7 23/32  
(196)  
4 1/16 (103.4)  
2 11/16 (68.1)  
2 13/16 (71.8)  
FRONT VIEW  
7/8 (22.5)  
7/8 (22.5)  
7/8 (22.5)  
M24546  
1 (25.5)  
BOTTOM  
Fig. 1. T775U Dimensions in inches (mm).  
6. Programming the Controller with no Reset – see page 25  
or  
Programming the Controller with Reset – page 28.  
7. Scheduling (optional)— see page 33.  
BEFORE INSTALLATION  
Review the “Specifications” on page 37 before  
installing the controller.  
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.  
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.  
MOUNTING  
This section describes the mounting procedures for the  
controller and temperature sensor(s).  
Controller Mounting  
IMPORTANT  
INSTALLATION AND SETUP  
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.  
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  
The controller must be mounted in a position that  
allows clearance for wiring, servicing, and  
removal.  
3
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
Use a screwdriver to pry out only the knockouts that you  
will use.  
WIRING  
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.  
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.  
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.  
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.  
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.  
Temperature Sensor Wiring  
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.  
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.  
Temperature Sensor(s) Mounting  
and Location  
IMPORTANT  
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.  
Poor wiring practices can cause erratic readings  
from the sensor. Avoid the following to ensure  
proper operation:  
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.  
•
•
•
•
•
•
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.  
NOTES:  
1.  
The included sensor is not designed for very  
wet applications. For immersion applications,  
an immersion well is used.  
2.  
3.  
Heat conductive compound must be used in  
immersion wells.  
See “Temperature Sensors (Sensor A or B)”  
on page 2 for this type of installation.  
If any of the above conditions cannot be  
avoided, use shielded cable.  
SENSOR  
PLACED  
IN WELL  
USE HEAT  
CONDUCTIVE  
COMPOUND  
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.  
IMMERSION  
WELL  
1/2 NPT  
M24379  
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.  
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.  
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-  
2
series wired must be of the n power (for example, 4, 9,  
16, etc.). See Fig. 3.  
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4
 
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
T
SENSOR A  
NOTE: SHIELDED CABLE MUST BE  
CONNECTED TO A SEPARATE EARTH  
GROUND.  
1
T
T
SENSOR B  
HOWEVER, DO NOT GROUND  
SHIELDED CABLE AT SENSOR END.  
2
SHIELDED  
CABLE  
SENSOR  
NOTE: TO MINIMIZE NOISE PICKUP,  
MAKE SENSOR CONNECTION FROM  
SHIELDED CABLE AS CLOSE AS  
POSSIBLE TO SENSOR BODY.  
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.  
1
2
M24549A  
Fig. 4. Sensor Wiring — 2-wire shielded cable connection from Sensor A to temperature sensor.  
NOTES:  
Humidity, Pressure, and Universal  
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.  
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.  
2.  
The T775U V terminal outputs 18 Vdc.  
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.  
5
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SHIELDED CABLE  
NOTES:  
SHIELDED CABLE  
NOTES:  
C
C
S
V
T
T
1. SHIELDED CABLE MUST BE  
S
1. SHIELDED CABLE MUST BE  
CONNECTED TO A SEPARATE  
EARTH GROUND. HOWEVER,  
DO NOT GROUND SHIELDED  
CABLE AT SENSOR END.  
SENSOR A  
SENSOR A  
SENSOR B  
CONNECTED TO A SEPARATE  
V
1
EARTH GROUND. HOWEVER,  
T
T
SENSOR B  
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.  
2. TO MINIMIZE NOISE PICKUP,  
MAKE SENSOR CONNECTION  
FROM SHIELDED CABLE AS  
CLOSE AS POSSIBLE TO  
SENSOR BODY.  
C
S
EXAMPLE OF  
P7640A  
S
C
V
EXAMPLE OF  
H76XX HUMIDITY  
SENSOR;  
PRESSURE  
SENSOR;  
0-10 VDC  
0-10 VDC  
CONNECTION  
CONNECTION  
1
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  
L1  
(HOT)  
24 VAC  
L2  
ENCLOSURE STYLING AND WIRING AS THE C7600B.  
M24550  
M24551  
Fig. 5. Sensor Wiring — 3-wire shielded cable  
connection from Sensor A to 0-10 Vdc sensor  
(H76xx humidity sensor shown).  
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  
SHIELDED CABLE  
1
C
S
V
T
T
3
SENSOR A  
SENSOR B  
2
S
V
PWR OUT COM ZERO  
1
SHIELDED CABLE MUST BE CONNECTED TO A SEPARATE EARTH GROUND.  
DO NOT GROUND SHIELDED CABLE AT SENSOR END.  
12-30 VDC  
POWER SUPPLY  
S
SHIELDED CABLE  
TO MINIMIZE NOISE PICKUP, MAKE SENSOR CONNECTION FROM SHIELDED  
CABLE AS CLOSE AS POSSIBLE TO SENSOR BODY.  
2
3
+
–
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.  
C
M24890C  
C
S
SENSOR A  
V
Fig. 6. Sensor Wiring — 2-wire shielded cable  
connection from 4-20 mA sensor to  
T
SENSOR B  
T
T775 controller (loop powered wiring).  
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.  
62-0255—07  
6
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
See Fig. 11 on page 8 for locating the appropriate power  
input, remote sensors input, low voltage, contact closure,  
and load output terminals.  
Controller Wiring  
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:  
WARNING  
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.  
Electrical Shock Hazard.  
•
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  
CAUTION  
Wire the sensors and outputs, then wire the power  
connection.  
Do not use 24 Vac power to power any external  
loads if 120 Vac or 240 Vac is used to power  
the T775U.  
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  
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.  
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 ter-  
minal location, twist the wires together a minimum  
of three turns before inserting them to ensure  
proper electrical contact.  
CAUTION  
Equipment Damage Hazard.  
Electrostatic discharge can short equipment  
circuitry.  
Ensure that you are properly grounded before  
handling the unit.  
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.  
1. STRIP 1/2 IN. (13 MM)  
FROM WIRES TO  
BE ATTACHED AT  
ONE TERMINAL.  
1/2 (13)  
1
2. TWIST WIRES  
TOGETHER WITH  
PLIERS (A MINIMUM  
OF THREE TURNS).  
W
C
+
2
NO HIGH VOLTAGE. CLASS 2 WIRING ONLY.  
1
2
EARTH GROUND TERMINAL MUST BE CONNECTED  
TO CONDUIT CLAMP LOCALLY.  
M24296  
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  
Fig. 9. Earth Ground.  
IMPORTANT  
Poor wiring practices can cause erratic readings  
GOOD MECHANICAL CONNECTION.  
M24552  
from the sensor. To ensure proper operation,  
ensure that good mechanical connections are  
made to both the sensor and the controller.  
Fig. 10. Attaching two or more wires at terminal  
blocks.  
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).  
7
62-0255—07  
 
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  
C – T  
SENSOR A  
B
S + T  
MOD 1  
–
+
R
V
T
T
1
W
2
SENSOR B  
B
MOD 2  
–
+
R
W
–
+
DIGITAL  
INPUT  
KNOCKOUT B  
POWER  
3
C
+
24 VAC  
POWER  
120/240 VAC  
1
2
WHEN USED FOR TEMPERATURE OR 4-20mA SENSING, SENSORS  
AND B USE THE TWO TT CONNECTIONS AND ARE POLARITY  
INSENSITIVE.  
A
OUTPUT  
RELAY 2  
NO  
C
NC  
OUTPUT  
RELAY 1  
NO  
C
NC  
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.  
KNOCKOUT C  
KNOCKOUT D  
3
A SEPARATE EARTH GROUND IS REQUIRED FOR ANY POWER  
SOURCE (24, 120, OR 240 VAC)  
KNOCKOUT E  
M24553A  
Table 2. Description of Wiring Terminal Connections.  
Terminal  
Label  
Connection  
Description  
Connection  
Terminal Label  
Outputs  
Description  
Sensors  
C – common 0-10 Vdc input: Universal  
S – signal sensor for humidity, pressure,  
V – voltage temperature, etc.  
Mod 1  
Mod 2  
+ - (Vdc or mA)  
Modulating Output  
b
W R B (Series 90)  
a
Sensor A  
S and V  
4-20mA input; see Fig. 7 on  
page 6  
24 Vac Power  
Temperature Sensor; polarity  
insensitive  
24V +  
+
-
24 Vac Hot  
T T  
T T  
Common  
Ground  
24 Vac Common  
c
Sensor B  
DI  
Temperature Sensor; polarity  
insensitive  
Earth Ground  
120 or 240 Vac Power  
Input  
120 Vac  
Common  
240 Vac  
120  
120 Vac Power  
Common  
+ -  
Digital Input (dry contact)  
Outputs  
COM  
240  
240 Vac Power  
Relay 1  
Relay 2  
NO / COM /  
NC  
120-240 Vac Relay Output  
a
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. 17 on page 10.  
The resistor is included with the controller.  
b
c
A separate earth ground is required for all installations regardless of the power source (24, 120, or 240 Vac).  
62-0255—07  
8
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
WIRING APPLICATION  
EXAMPLES  
C – T  
S + T  
V
1
Fig. 12 – 18 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).  
C
+
120V  
COM  
2
C – T  
1
S + T  
V
NO  
COM  
NO  
C
NC  
NO  
C
NC  
NO  
LOAD 2  
LOAD 1  
COM  
1
2
FOR SPECIFIC SENSOR WIRING (TEMPERATURE, HUMIDITY,  
PRESSURE, ETC), REFER TO THE SENSOR WIRING SECTIONS  
BEGINNING ON PAGE 4.  
L1  
(HOT)  
24 VAC  
FOR 240 VAC LOAD, CONNECT TO 240 TERMINAL.  
M24555A  
L2  
Fig. 14. Wiring for Two-stage Control with 120 or 240  
Vac (120 Vac Input and 120 Vac Load).  
C
+
LOAD 1  
LOAD 2  
NO  
COM  
NO  
C
NC  
NO  
C
NC  
COM  
NO  
–
+
DIGITAL  
INPUT  
FOR SPECIFIC SENSOR WIRING (TEMPERATURE, HUMIDITY,  
PRESSURE, ETC), REFER TO THE SENSOR WIRING SECTIONS  
1
M24559  
BEGINNING ON PAGE 4.  
M24554A  
Fig. 15. Wiring for Digital Input (dry contact).  
Fig. 12. Wiring for Two-stage Control – 24 Vac Input  
and 24 Vac Load.  
HONEYWELL MODUTROL MOTOR WITH  
VOLTAGE CONTROL INPUT  
HONEYWELL MODUTROL MOTOR WITH  
4-20 mA MODULATING INPUT  
+
C
–
T1 T2  
R
F
T1 T2  
–
+
1
POWER  
OUTPUT  
POWER  
OUTPUT  
B
R
–
B
R
W +  
B
1
–
+
MODULATING OUTPUT  
TERMINAL (MOD 1)  
W
–
+
R
W
MODULATING OUTPUT  
TERMINAL (MOD 1)  
B
–
+
R
W
1
USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.  
M24558A  
USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.  
M24557A  
1
Fig. 16. Wiring for mod motor or direct coupled  
actuator with 0-10 Vdc control input.  
Fig. 13. Wiring for mod motor or direct coupled  
actuator with 4 to 20 mA control input.  
9
62-0255—07  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
If any wiring changes are required, first be sure to remove  
HONEYWELL ELECTRONIC  
power from the controller before starting work. Pay  
particular attention to verifying the power connection  
(24, 120, or 240 Vac).  
SERIES 90 MODUTROL MOTOR  
1
T1 T2 B R W  
After the controller is mounted and wired, apply power.  
POWER  
OUTPUT  
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.  
2
B
R
–
3
W
+
MODULATING  
B
OUTPUT  
R
–
TERMINAL  
Humidity, Pressure, and Universal  
Sensor Calibration  
W
(MOD 1)  
+
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.  
1
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  
2
3
USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.  
Table 3. Calibration Range Examples.  
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.  
M24560A  
Min.  
Max.  
Value  
Min-Max  
Range  
Value  
Calibration  
Range  
Fig. 17. Wiring for Series 90 Modutrol Motor Control.  
Units Example Example Result  
PSI  
100  
400  
300  
40  
± 30 PSI  
HONEYWELL  
ELECTRONIC SERIES 90  
MODUTROL MOTOR  
MINIMUM POSITION  
POTENTIOMETER  
(Q209)  
Inches  
W.C.  
-20.0  
20.0  
± 4 in. W.C.  
SPDT CHANGEOVER  
(H205 OR H705)  
Pa or  
kPa  
-2,000  
10  
3000  
100  
5000 ± 500 Pa/kPa  
90 ± 9%  
W
R
B
T1 T2 B R W  
2
%
1
POWER  
OUTPUT  
The calibration value is set in section “1.2.2.3.  
CALIBRATE (Sensor A or B)” on page 16.  
B
–
+
R
W
MODULATING OUTPUT  
TERMINAL (MOD 1)  
B
3
–
+
R
Temperature Sensor Calibration  
W
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.  
1
2
USE SEPARATE TRANSFORMER FOR T775 WHEN USING 24 VAC.  
A 250 OHM RESISTOR PROVIDES 40% AUTHORITY WHEN  
USING A 150 OHM MINIMUM POSITION POTENTIOMETER.  
3
INSERT 340 OHM RESISTOR (INCLUDED) ACROSS TERMINALS R AND W.  
M24561A  
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.  
Fig. 18. Wiring for Changeover Relay and  
Minimum Position Potentiometer used with  
Series 90 Modutrol Motors.  
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.  
CHECKOUT  
Inspect all wiring connections at the controller terminals,  
and verify compliance with the installation wiring  
diagrams.  
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).  
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.  
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10  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
Table 4. Temperature Sensor Calibration for  
HOME  
RELAYS 1 2  
ON  
Resistance Loss due to Wire Length.  
MENU AREA  
Temperature Offset in  
a
SENSORS  
SENSOR A  
°F (Feet)  
AWG  
Rating  
mΩ/ft  
2.5  
200 ft  
0.46  
0.72  
1.16  
1.86  
2.92  
500 ft  
1.14  
1.82  
2.90  
4.64  
7.32  
1,000 ft  
2.28  
o
o
F
78  
SENSOR B  
84  
14  
16  
18  
20  
22  
F
4.0  
3.64  
DATA AREA  
LOCK ICON  
6.4  
5.82  
10.2  
16.1  
9.28  
MOD1  
MOD2  
DI ON  
40%  
60%  
14.64  
Temperature Offset in  
a
home  
menu  
°C (Meter)  
AWG  
Rating  
mΩ/m  
8.3  
100 m  
200 m  
0.86  
1.38  
2.18  
3.48  
5.48  
300 m  
6 BUTTON KEYPAD  
M24563  
14  
16  
18  
20  
22  
0.44  
0.68  
1.10  
1.74  
2.74  
1.30  
2.06  
3.28  
5.22  
8.22  
13.2  
21.0  
33.5  
52.8  
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.  
a
This 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).  
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.  
RESISTANCE (OHMS)  
1489  
1403  
1317  
1231  
1145  
NOTE: Pressing and holding the HOME and MENU but-  
tons 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”).  
1059  
973  
887  
801  
1097 0.08 OHMS  
AT 77°F (25°C)  
1
Using the LCD Panel Interface  
The 6-button keypad is used to move through the menus  
and enter or change parameter values.  
-40 -20  
0
20 40 60 80 100 120 140 160 180 200 220  
250 °F  
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.  
-40 -30 -20 -10  
0
10 20 30 40 50 60 70 80 90 100 110 120 °C  
TEMPERATURE (DEGREES)  
POSITIVE TEMPERATURE COEFFICIENT (PTC) OF 2.1 OHMS PER °F  
1
M24304  
Fig. 19. Sensor Resistance vs. Temperature.  
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.  
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.  
Left and Right Arrow Buttons (W and X)  
Use these buttons to move backward (W) and forward (X)  
The following figure describes the display areas of the  
LCD and the keypad.  
through the Program and Setup menus.  
11  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
Up and Down Arrow Buttons (S and T)  
Program, Schedule, and Summary  
Use these buttons to move your selection up and down  
through a menu or list.  
Menus  
To access these menus from the home screen, press the  
MENU button. See Fig. 22.  
•
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.  
MENU DISPLAY WHEN  
SCHEDULING IS SET  
MENU DISPLAY WHEN  
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  
RELAYS  
ON  
1
2
MENU  
MENU  
SENSORS  
SENSOR A  
PROGRAM  
SCHEDULE  
SUMMARY  
EXIT  
PROGRAM  
EXIT  
o
o
F
78  
SENSOR B  
Home Screen  
84  
F
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.  
MOD1  
MOD2  
DI ON  
40%  
60%  
When using Reset, the Heat/Cool setpoint(s) display on  
the home screen for the Mod and Relay outputs; see  
Fig. 21.  
home  
menu  
OR  
Active relays are indicated by the small black square („)  
just below the relay number. Fig. 21 shows the home  
screen with relay 2 energized.  
M24565  
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.  
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).  
HOME  
HOME  
HOME  
RELAYS  
ON  
1
2
RELAYS  
ON  
1
2
RELAYS  
ON  
1
2
SENSORS  
MOD 1  
40%  
REL 2  
ON  
Setup Menu  
To access the Setup menu, press and hold the MENU  
button for five seconds. See Fig. 23.  
SENSOR A  
COOL  
HEAT  
o
o
F
F
SETPOINT  
SETPOINT  
78  
o
o
o
o
F
F
F
F
SENSOR B  
74  
60  
SENSOR A  
SENSOR A  
84  
62  
62  
HOME  
RT 12345 HRS  
RELAYS  
ON  
1
2
MOD1  
MOD2  
DI ON  
40%  
60%  
MOD1  
MOD2  
40%  
60%  
MOD1  
MOD2  
DI ON  
40%  
60%  
SETUP  
SENSORS  
SENSOR A  
SENSORS  
OUTPUTS  
EXIT  
DI ON  
o
o
F
78  
SENSOR B  
84  
F
M24564  
MOD1  
MOD2  
DI ON  
40%  
60%  
Fig. 21. LCD Display - Home Screen Displaying  
Sensors, Mod Outputs, and Active Relays.  
FIVE  
home  
menu  
NOTES:  
1.  
SECONDS  
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 informa-  
tion is a snapshot taken when you press the  
W or X button to display the screen.  
M24566  
Fig. 23. Setup Menu.  
2.  
In Reset mode, the home screen displays the  
effective setpoint.  
Using the Menus  
IMPORTANT  
After four minutes of inactivity (no buttons  
When you are working with the menus, use the:  
pressed), the LCD display reverts to the home  
screen display.  
•
•
•
Left arrow button (W) to scroll backward through the  
menus  
Accessing the Menus  
Right arrow button (X) to select the highlighted menu  
item and display its content  
Menus are used for programming, scheduling, viewing the  
summary settings, and setup of advanced options.  
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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12  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
NOTES:  
1.  
IMPORTANT  
If you press the HOME button or there is no  
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.  
keypad activity for four minutes, you exit  
Program mode and return to the home  
screen.  
If you press the MENU button, you exit and  
return to the menu.  
2.  
Programming the T775U  
Controller  
PROGRAMMING OVERVIEW  
The controller must be programmed before being placed  
into service.  
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:  
IMPORTANT  
During programming, the controller is live at all  
times. For example, the contacts may open and  
close when adjusting the setpoint.  
•
Program the Outputs for No Reset — see  
“2. Programming Outputs (MOD and Relay) with No  
Reset” on page 25.  
•
Program the Outputs for Reset — see  
“3. Programming Outputs (MOD and Relay) with  
Reset” on page 28.  
The Programming process uses a hierarchical menu  
structure that is easy to use. You press the W and X  
arrow buttons to move forward and backward through the  
menus.  
When programming is complete, you may continue with  
“4. Scheduling” on page 33.  
NOTES:  
1.  
The T775U controller interface is intuitive.  
You may find that you do not need the follow-  
ing procedure instructions to program the  
controller. You may want to use this proce-  
dure simply as a reference to locate the par-  
ticular option or parameter of interest.  
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.  
2.  
The menus can display only those relays that  
are defined in Setup (see “1.3.2. NBR OF  
RELAYS” on page 21). For example, if you  
configure only one relay, then only one relay  
displays on the appropriate menus.  
If you press the HOME button or there is no  
keypad activity for four minutes, you exit Pro-  
gram mode and return to the home screen.  
If you press the MENU button, you exit  
Program mode and return to the menu.  
NOTE:  
1.  
The T775U controller interface is intuitive.  
You may find that you do not need the follow-  
ing setup instructions for the sensors and out-  
puts. You may want to use this procedure  
simply as a reference to locate the particular  
option or parameter of interest.  
3.  
4.  
2.  
3.  
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.  
If you press the MENU button, you exit Setup  
mode and return to the menu.  
Setpoint and Differential  
The following describes the relationship between setpoint  
and differential for heating and cooling. These settings are  
programmed for each output relay.  
In heating mode, reverse acting mode, and humidify  
mode, the differential falls 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.  
Once in Setup mode, you use the —  
•
•
•
Left arrow button (W) to scroll backward through the  
Setup menus  
Right arrow button (X) to select the highlighted menu  
item and display its content  
In cooling mode, direct acting mode, and dehumidify  
mode, the differential falls 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.  
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 setup parameter  
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, W, and X 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.  
13  
62-0255—07  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
To change the controller’s sensors and output setup  
parameters, perform the following procedures in the order  
listed:  
1. Enter Setup mode — see “1.1. Entering Setup  
Mode”  
Setup Procedure  
The Setup process uses a hierarchical menu structure  
that is easy to use. You press the W and X arrow buttons  
to move forward and backward through the menus.  
2. Setup Sensors — see “1.2. Setting up the Sensors”  
3. Setup Outputs — see “1.3. Setting up the Outputs”  
on page 17  
4. Exit Setup Mode — see “1.4. Exiting Setup” on  
page 24  
NOTE: The menus can display only those relays that  
are defined in Setup (see “1.3.2. NBR OF  
RELAYS” on page 21). For example, if you con-  
figure only two relays, then only two relays dis-  
play on the appropriate menus.  
1.1. Entering Setup Mode  
To enter Setup mode, press and hold the MENU button  
for five seconds to display the Setup menu. See Fig. 23  
on page 12.  
1.2. Setting up the Sensors  
SETUP  
SETUP  
SENSORS  
SENSORS  
1. From the Setup menu, use the S and T buttons to  
highlight SENSORS.  
2. Press the X button to display the Sensors menu.  
# SENSORS  
SENSOR A  
SENSOR B  
EXIT  
M24586  
Fig. 24. Setup - Sensors Menu.  
1.2.1. Number of SENSORS  
The value entered here determines the number of  
sensors displayed on the home screen.  
SETUP  
SENSORS  
# SENSORS  
SETUP  
SENSORS  
# SENSORS  
NOTE: For applications that do not use Reset, only one  
sensor (Sensor A) is available for use.  
1. From the Sensors menu, highlight # SENSORS then  
2
press the  
X
button to display the number of sensors.  
ENTER  
NUMBER OF  
SENSORS  
2. Use the S and T buttons to enter the number of  
sensors (1 or 2).  
Default: 2  
M24587  
3. Press the X button to accept the value and display  
the SENSOR A selection.  
Fig. 25. Setup - Sensors - Number of Sensors.  
SENSOR A  
TYPE = 0-5V, 0-10V,  
OR 4-20MA  
SENSOR A  
TYPE = PT1000  
1.2.2. 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.  
SETUP  
SENSORS  
SENSOR A  
SETUP  
SETUP  
SENSORS  
SENSOR A  
SENSORS  
SENSOR A  
TYPE  
TYPE  
UNITS  
CALIBRATE  
LABEL  
EXIT  
UNITS  
MIN VAL  
MAX VAL  
CALIBRATE  
LABEL  
1. From the Sensors menu, highlight SENSOR A.  
2. Press the X button to display the Sensor A selec-  
tions.  
EXIT  
The menu selections change depending on whether the  
sensor type is 1097Ω PTC (temperature) or 0-10V / 4-  
20MA.  
M24588A  
Fig. 26. Setup - Sensors - Sensor A Menu.  
62-0255—07  
14  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SETUP  
SENSORS  
SENSOR A  
TYPE  
SETUP  
SENSORS  
SENSOR A  
TYPE  
1.2.2.1. TYPE (Sensor A only)  
1. From the Sensor A selections, use the S and T  
buttons to highlight TYPE.  
PT 1000  
2. Press the X button to display the type values.  
3. Use the S and T buttons to highlight the desired  
value PT1000 (1097Ω PTC), 0-5V, 0-10V, or 4-  
20MA.  
0-5V  
0-10V  
4-20MA  
Default: PT1000  
NOTE: The default label PT1000 refers to a 1097Ω PTC  
temperature sensor.  
SELECT  
TYPE FOR  
SENSOR A  
4. Press the X button to accept the units and return to  
M24589A  
the Sensor A selections.  
5. For PT1000 (1097Ω PTC) temperature sensors, go  
Fig. 27. Setup - Sensors - Sensor A - Type.  
to “1.2.2.2.1. UNITS (Sensor A or B; PT1000  
[1097W PTC)]”.  
For 0-5V, 0-10V, and 4-20MA sensors, go to  
“1.2.2.2.2. UNITS (Sensor A only; 0-5V, 0-10V, or 4-  
20mA)”  
SETUP  
SENSORS  
SENSOR A  
UNITS  
SETUP  
SENSORS  
SENSOR A  
UNITS  
1.2.2.2.1. UNITS (Sensor A or B; PT1000  
[1097Ω PTC)]  
If Sensor A is configured for °F or °C units, then the units  
selection does not appear for Sensor B, since Sensor B  
uses the units specified for Sensor A.  
DEG F  
DEG C  
1. From the Sensor A selections, use the S and T  
buttons to highlight UNITS.  
2. Press the X button to display the temperature units.  
3. Use the S and T buttons to highlight F or C.  
Default: F (Fahrenheit)  
SELECT  
UNITS FOR  
SENSOR A  
4. Press the X button to accept the units and return to  
M24590  
the Sensor A selections.  
Fig. 28. Setup - Sensors - Sensor A - Units.  
Continue with “1.2.2.3. CALIBRATE (Sensor A or B)”.  
SETUP  
SENSORS  
SENSOR A  
UNITS  
SETUP  
SENSORS  
SENSOR A  
UNITS  
1.2.2.2.2. UNITS (Sensor A only; 0-5V, 0-10V, or  
4-20mA)  
DEG F  
1. From the Sensor A selections, use the S and T  
buttons to highlight UNITS.  
2. Press the X button to display the units list.  
3. Use the S and T buttons to scroll through the list  
and highlight the desired unit of measure.  
You may need to scroll up or down to view all units.  
Default: F (Fahrenheit)  
DEG C  
PSI  
IN WC  
% RH  
PA  
KPA  
PPM  
NONE  
SELECT  
UNITS FOR  
SENSOR A  
4. Press the X button to accept the units and return to  
M24591A  
the Sensor A selections.  
Fig. 29. Setup - Sensors - Sensor A - Units.  
15  
62-0255—07  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SETUP  
SENSORS  
SENSOR A  
SETUP  
SENSORS  
SENSOR A  
MIN VAL  
SETUP  
SENSORS  
SENSOR A  
MAX VAL  
1.2.2.2.3. MIN or MAX VALUE (Sensor A only;  
0-5V, 0-10V or 4-20mA)  
MIN VAL  
OR  
MAX VAL  
The minimum and maximum values display only for  
Sensor A when its type is 0-5V, 0-10V or 4-20MA.  
1. From the Sensor A selections, use the S and T  
buttons to highlight MIN VAL or MAX VAL.  
2. Press the X button to display the units.  
3. Use the S and T buttons to increase/decrease the  
desired value.  
o
F
o
F
0.0  
ENTER  
MINIMUM  
VALUE FOR  
SENSOR A  
0.0  
ENTER  
MAXIMUM  
VALUE FOR  
SENSOR A  
Sensor Ranges:  
°F  
°C  
PSI  
-60.0 to 270.0  
-51.0 to 132.0  
-500 to 500  
M24592A  
IN WC -30.0 to 30.0  
Fig. 30. Setup - Sensors - Sensor A - 0-5V, 0-10V, OR  
%
0.0 to 100.0  
-3000 to 3000  
-3000 to 3000  
0 to 9990  
4-20MA - MIN and MAX Value (showing °F).  
PA  
KPA  
PPM  
NONE -9999 to 9999  
4. Press the X button to accept the units and return to  
the Sensor A selections.  
SETUP  
SENSORS  
SENSOR A  
CALIBRATE  
SETUP  
1.2.2.3. CALIBRATE (Sensor A or B)  
Ensure that the wire size calibration value is within the  
limits for the sensor.  
SENSORS  
SENSOR A  
CALIBRATE  
•
For temperature sensors, see “Temperature Sensor  
Calibration” on page 10.  
•
For other sensors, see “Humidity, Pressure, and  
Universal Sensor Calibration” on page 10.  
o
F
0.0  
1. From the Sensor A selections, use the S and T  
buttons to highlight CALIBRATE.  
2. Press the X button to display the calibration value.  
3. Use the S and T buttons to increase/decrease the  
desired calibration value.  
ENTER  
VALUE TO  
CALIBRATE  
SENSOR A  
M24594  
Fig. 31. Setup - Sensors - Sensor A - Calibrate.  
Default: 0.0  
Sensor Range Temperature: +/-10°F (+/-6°C)  
Other Sensor Range: +/-10% of the Min to Max  
values specified previously. See Table 3 on  
page 10 for examples.  
4. Press the X button to accept the value and return to  
the Sensor A selections.  
SETUP  
SETUP  
SENSORS  
1.2.2.4. LABEL (Sensor A or B input)  
SENSORS  
SENSOR  
A
SENSOR  
LABEL  
A
For a sensor already labeled, the display positions to and  
highlights that label.  
LABEL  
SENSOR  
BOILER A  
A
1. From the Sensor A selections, use the S and T  
buttons to highlight LABEL.  
2. Press the X button to display the label list.  
3. Use the S and T buttons to scroll through the list  
and highlight the desired label.  
OUTDOOR A  
DUCT A  
DISCHRG A  
CHILLER A  
ROOM A  
You may need to scroll up or down to view all possi-  
ble labels.  
4. Use the X button to accept the highlighted label  
SELECT  
LABEL FOR  
SENSOR  
A
M24595  
and exit the list.  
Fig. 32. Setup - Sensors - Sensor A - Label.  
NOTE: The label names in list order are: Sensor, Boiler,  
Outdoor, Duct, Dischrg, Chiller, Room, Supply,  
Return, and Animals.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
1.2.2.5. Exit Sensor A Setup  
Press the W button to exit Sensor A selections and return  
SETUP  
SENSORS  
SENSOR A  
to the Sensors menu.  
UNITS  
or  
CALIBRATE  
LABEL  
Use the S and T buttons to highlight EXIT and press the  
EXIT  
X button.  
Continue with “1.2.3. SENSOR B (Temperature only)”  
M24596  
Fig. 33. Setup - Sensors - Sensor A - Exit.  
1.2.3. SENSOR B (Temperature only)  
SETUP  
SENSORS  
SETUP  
For two-sensor reset control, Sensor B must always be  
the controlling temperature. For example, in a reset  
control based on outside temperature, Sensor B must be  
the outside sensor.  
SENSORS  
# SENSORS  
SENSOR A  
SENSOR B  
EXIT  
NOTE: Sensor B is available only for reset on the  
T775U2006, but can be controlled just like Sen-  
sor A on the T775U2016.  
1. From the Sensors menu, use the T button to high-  
light SENSOR B.  
M24597  
2. Press the X button to display the Sensor B menu.  
3. Repeat the selections described in “1.2.2. SENSOR  
A” through “1.2.2.4. LABEL (Sensor A or B input)”  
beginning on page 14, but perform only those steps  
applicable to Sensor B.  
Fig. 34. Setup - Sensors - Sensor B Menu.  
4. Press the W button to exit SENSOR B and return to  
the Sensors menu.  
or  
Use the S and T buttons to highlight EXIT and  
press the X button.  
5. Press the W button to exit the Sensors menu and  
return to the Setup menu.  
Continue with “1.3. Setting up the Outputs”.  
SETUP  
OUTPUTS  
MOD 1  
SETUP  
OUTPUTS  
MOD 1  
1.3. Setting up the Outputs  
1. From the Setup menu, use the Sand T buttons to  
highlight OUTPUTS.  
2. Press the X button to display the Outputs menu.  
TYPE  
MIN OUT %  
INTEGRAL  
DERIVATIV  
SCHEDULE  
RESET  
NOTE: The menus (e.g. the Outputs menu shown here)  
can display only those relays that are defined in  
Setup (see page 21). For example, if you config-  
ure only two relays, then only two relays display  
on the appropriate menus.  
HIDE  
EXIT  
M24599A  
The following procedures set up each modulating output  
and relay output.  
Fig. 35. Setup - Outputs Menu.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SETUP  
OUTPUTS  
MOD 1  
SETUP  
OUTPUTS  
MOD 1  
1.3.1. Setting up the Modulating Outputs  
1. From the Output menu, use the S and T buttons to  
highlight the desired modulating output (MOD 1 or  
MOD 2).  
TYPE  
MIN OUT %  
INTEGRAL  
DERIVATIV  
SCHEDULE  
RESET  
2. Press the X button to display the selected MOD  
menu.  
EXIT  
Use the remaining procedures, beginning with “1.3.1.1.  
TYPE (of output signal)”, to set up each modulating  
output. If you have two modulating outputs, repeat these  
procedures for each modulating output.  
M24599  
Fig. 36. Setup - Outputs - Modulating Output Menu.  
SETUP  
OUTPUTS  
MOD 1  
TYPE  
SETUP  
OUTPUTS  
MOD 1  
1.3.1.1. TYPE (of output signal)  
TYPE  
1. From the Mod menu, use the S and T buttons to  
highlight TYPE.  
2. Press the X button to display the Type selections.  
3. Use the Sand T buttons to highlight the desired  
output type.  
4 - 20 mA  
0-10 V  
2-10 V  
SERIES 90  
Default: 4-20 mA  
4. Press the X button to accept the selected type and  
return to the Mod menu.  
SELECT  
TYPE FOR  
MOD 1  
M24600  
Fig. 37. Setup - Outputs - Mod Out - Type.  
SETUP  
OUTPUTS  
MOD 1  
MIN OUT %  
SETUP  
OUTPUTS  
MOD 1  
1.3.1.2. MIN OUT %  
The minimum output % prevents the output from dropping  
below the value entered. This value can be useful to  
maintain minimum damper position.  
MIN OUT %  
Using the time clock or digital input to disable the output  
forces the output to 0%.  
%
0
1. From the Mod menu, use the S and T buttons to  
highlight MIN OUT %.  
2. Press the X button to display the Min Out %.  
3. Use the S and T buttons to increase/decrease the  
desired value from 0% to 100% in 1% increments.  
Default: 0%  
ENTER  
MINIMUM  
PERCENT FOR  
MOD 1  
M24601  
Fig. 38. Setup - Outputs - Mod Out - Minimum Output  
Percentage.  
Range: 0 to 100%  
4. Press the X button to accept the percentage and  
return to the Mod menu.  
SETUP  
OUTPUTS  
MOD 1  
INTEGRAL  
SETUP  
OUTPUTS  
MOD 1  
1.3.1.3. INTEGRAL  
INTEGRAL  
1. From the Mod menu, use the S and T buttons to  
highlight INTEGRAL.  
2. Press the X button to display the Integral seconds.  
3. Use the S and T buttons to increase/decrease the  
value from 0 to 3,600 in 10 second increments.  
Default: 400 seconds  
SEC  
400  
Range: 0 to 3,600 seconds  
ENTER  
INTEGRAL  
TIME FOR  
MOD 1  
4. Press the X button to accept the seconds and  
return to the Mod menu.  
M24602  
See the Notes on page 19 for Integral timing information.  
Fig. 39. Setup - Outputs - Mod Out - Integral.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
NOTES: (Integral Timing)  
1. The Integral time is factory set for 400 seconds. This  
is a good middle range and should satisfy many  
applications. The integral time can be increased for  
applications where sensed response is slow, and can  
be decreased for applications where sensed  
the offset from setpoint during steady state control  
that is often seen in proportional only control.  
3. Keep in mind that control is most sensitive to  
throttling range. Adjust the throttling range first  
before any adjustment to integral time. Adjust  
throttling range to be as wide as possible to start  
since this will provide the most stable control.  
Remember that the integral will eliminate the steady  
state error so you do not need to have a small  
throttling range to have accurate control. (Integral  
action allows for controlling to a setpoint even with a  
wide throttling range).  
response is fast (e.g. discharge air control).  
2. As a starting point, an optimal integral time for  
discharge air typically ranges from 12 to 200  
seconds. An optimal integral time for room control  
typically ranges from 60 to 2,500 seconds. The  
purpose of integral action is to reduce or eliminate  
SETUP  
OUTPUTS  
MOD 1  
DERIVATIV  
SETUP  
OUTPUTS  
MOD 1  
1.3.1.4. DERIVATIVE  
The Derivative default value is factory set to zero (no  
derivative control). It is strongly recommended that the  
derivative remain at zero (0) unless you have a very good  
reason to adjust it. Derivative control is not needed in the  
vast majority of HVAC applications.  
DERIVATIV  
SEC  
0
ENTER  
1. From the Mod menu, use the S and T buttons to  
highlight DERIVATIV.  
2. Press the X button to display the Derivative sec-  
DERIVATIVE  
TIME FOR  
MOD 1  
onds.  
3. Use the S and T buttons to increase/decrease the  
value.  
M24603  
Fig. 40. Setup - Outputs - Mod Out - Derivative.  
Default: 0 (zero)  
Range: 0 to 3,600 seconds  
4. Press the X button to accept the seconds and  
return to the Mod menu.  
SETUP  
OUTPUTS  
MOD 1  
SCHEDULE  
SETUP  
OUTPUTS  
MOD 1  
1.3.1.5. SCHEDULE  
The Schedule option displays only if the USE SCHED  
parameter is set to Yes (see page 21).  
1. From the Mod menu, use the S and T buttons to  
highlight SCHEDULE.  
SCHEDULE  
YES  
NO  
2. Use the S and T buttons to highlight YES or NO.  
Default: YES  
3. Press the X button to accept the selection and  
return to the Mod menu.  
USE  
SCHEDULE  
FOR  
Each output can be set up to follow or ignore the built in  
scheduler. To disable the scheduler for all outputs, see  
“1.3.3.1. USE SCHED” on page 21.  
OUTPUTS  
M24604  
Fig. 41. Setup - Outputs - Mod Out - Schedule.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SETUP  
SETUP  
OUTPUTS  
1.3.1.6. RESET  
OUTPUTS  
MOD 1  
MOD 1  
RESET  
This selection enables the controller’s Reset function, and  
allows each output to be individually programmed for  
Reset or No Reset.  
RESET  
YES-BOILER  
YES-OTHER  
NO  
IMPORTANT  
To use the Reset function of the controller, the  
first modulating output (MOD1) must be set for  
Reset here.  
USE  
RESET  
FOR  
The RESET choice is offered for all outputs in setup  
mode, and you can set any or all of them for Reset=YES  
or Reset=NO. The default is Reset=NO.  
MOD1  
M24605  
Fig. 42. Setup - Outputs - Mod Out - Reset.  
For the remaining outputs, if Reset=YES, then these  
outputs use the reset curve programmed for the first  
output.  
1. From the Mod menu, use the S and T buttons to  
highlight RESET.  
2. Use the S and T buttons to highlight the desired  
value.  
Default: NO  
3. Press the X button to accept the selection and  
return to the Mod menu.  
SETUP  
OUTPUTS  
MOD 1  
HIDE  
SETUP  
OUTPUTS  
MOD 1  
1.3.1.7. Hide  
The Hide option is used to prevent the MOD 1 and MOD 2  
outputs from displaying on the Home screen.  
HIDE  
YES  
NO  
1. From the Mod menu, use the S and T buttons to  
highlight HIDE.  
2. Use the S and T buttons to highlight YES or NO.  
Default: YES  
3. Press the X button to accept the selection and  
return to the MOD menu.  
HIDE MOD 1 ON  
HOME SCREEN  
NOTE: The MOD1 and MOD2 outputs are still active  
even when hidden from the Home screen.  
M28656  
Fig. 43. Setup - Outputs - Mod 1/2- Hide.  
1.3.1.7. Exit Modulating Outputs Setup  
Press the W button (or highlight EXIT and press the X  
button) to exit the Mod menu and return to the Outputs  
menu.  
SETUP  
OUTPUTS  
MOD 1  
TYPE  
MIN OUT %  
INTEGRAL  
DERIVATIV  
SCHEDULE  
EXIT  
To configure the second modulating output, go to “1.3.1.  
Setting up the Modulating Outputs” on page 18.  
When you finish setting up the two modulating outputs,  
continue with “1.3.2. NBR OF RELAYS”.  
M24606  
Fig. 44. Setup - Outputs - Mod Out - Exit.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SETUP  
OUTPUTS  
# RELAYS  
1.3.2. NBR OF RELAYS  
SETUP  
OUTPUTS  
# RELAYS  
1. From the Outputs menu, use the Sand T buttons  
to highlight # RELAYS.  
2. Press the X button to display the number of relays.  
3. Use the S and T buttons to display the number  
from 1 to 2.  
4. Press the X button to accept the value and display  
2
the Outputs menu.  
ENTER  
NUMBER OF  
RELAYS  
The number of relay outputs entered here determines  
how many relays display on the home screen.  
M24607  
Fig. 45. Setup - Outputs - Number of Relays.  
SETUP  
SETUP  
1.3.3. OPTIONS  
OUTPUTS  
OPTIONS  
OUTPUTS  
OPTIONS  
1. From the Outputs menu, use the Sand T buttons  
to highlight OPTIONS.  
2. Press the X button to display the Options menu.  
USE SCHED  
MIN OFF  
MIN ON  
DI OPTS  
SHOW RT  
EXIT  
M24608A  
Fig. 46. Setup - Outputs - Options Menu.  
SETUP  
OUTPUTS  
OPTIONS  
USE SCHED  
SETUP  
OUTPUTS  
OPTIONS  
USE SCHED  
1.3.3.1. USE SCHED  
1. Press the  
X
button to display the schedule selections.  
2. Use the Sand T buttons to highlight YES or NO.  
YES  
NO  
Default: NO  
3. Press the X button to accept the value and display  
the MIN OFF option.  
Selecting NO disables scheduling for all outputs.  
USE  
SCHEDULE  
FOR  
Selecting YES enables scheduling for all outputs. When  
YES is selected, all individual outputs default to follow the  
schedule. However, each individual output can be  
removed from scheduling as desired.  
OUTPUTS  
M24609  
Fig. 47. Setup - Outputs - Options - Schedule.  
With Scheduling enabled, when you return to Program  
mode, the new option for Scheduling displays. You can  
press the HOME button and then the MENU button to  
view the Schedule options in the menu.  
See “1.3.1.5. SCHEDULE” on page 19.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SETUP  
OUTPUTS  
OPTIONS  
MIN OFF  
SETUP  
OUTPUTS  
OPTIONS  
MIN OFF  
SETUP  
OUTPUTS  
OPTIONS  
MIN ON  
1.3.3.2. MIN OFF or MIN ON  
This is the minimum number of seconds of “off time” or  
“on time” for all relays.  
OR  
MIN ON  
1. Press the X button to display the Min Off/On value.  
2. Use the S and T buttons to increase/decrease the  
desired number of seconds from 0 to 990 seconds  
in 10 second increments.  
Default: 0 (zero)  
Range: 0 to 990 seconds  
3. Press the X button to accept the seconds and  
SEC  
SEC  
0
0
ENTER  
MINIMUM  
OFF TIME  
ENTER  
MINIMUM  
ON TIME  
FOR RELAYS  
FOR RELAYS  
display the DI OPTIONS.  
M24610A  
NOTES:  
Fig. 48. Setup - Outputs - Options - Min Off/On Time.  
1.  
The minimum off time applies to all relay  
outputs.  
2.  
When minimum off time is active, relays  
waiting to be energized display a flashing  
square underneath the relay number on the  
home screen.  
3.  
If the minimum off time is not equal to zero  
(0), the minimum off time activates at power-  
up. To manually override, press the W button  
at any time.  
SETUP  
SETUP  
OUTPUTS  
1.3.3.3. DI OPTIONS (digital input options)  
OUTPUTS  
OPTIONS  
OPTIONS  
DI OPTS  
The DI Option you select applies to all outputs. This  
option overrides any Setpoint/Setback values entered in  
the Schedule.  
DI OPTS  
DISABLE  
SETPOINT  
SETBACK  
ENABLE  
1. Press the X button to display the DI Option selec-  
tions.  
IGNORE  
2. Use the S and T buttons to highlight DISABLE,  
SETBACK, or IGNORE.  
Default: DISABLE  
3. Press the X button to accept the value and display  
SELECT DI  
OPTIONS  
FOR  
OUTPUTS  
M24611A  
the SHOW RT option.  
When the digital input (DI) closes, all outputs follow the DI  
option value (Disable, Setback, or Ignore):  
Fig. 49. Setup - Outputs - Options - DI Options.  
•
•
•
DISABLE disables the outputs; relays return to de-  
energized state and Mod outputs return to 0% output.  
SETPOINT forces the control to the setpoint  
temperature.  
SETBACK enables a setback temperature value to be  
programmed for each output.  
—
To program the Setback temperature with Reset,  
see Fig. 73 on page 31.  
—
To program the Setback temperature without  
Reset, see Fig. 60 on page 26.  
•
•
ENABLE energizes all relays to 100%. Use this option  
carefully.  
IGNORE causes the digital input to have no effect on  
the Relay or Mod outputs.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SETUP  
OUTPUTS  
OPTIONS  
SHOW RT  
SETUP  
1.3.3.4. SHOW RT (show run time hours)  
OUTPUTS  
OPTIONS  
SHOW RT  
1. Press the X button to display the Show RT values.  
2. Use the S and T buttons to select YES or NO.  
Default: YES  
YES  
NO  
3. Press the X button to accept the value and return to  
the Options menu.  
Selecting YES shows the RT (run time) hours for each  
relay on the home screen displays.  
USE  
RUNTIME  
FOR  
NOTE: Run times can be reset to zero for each individ-  
RELAYS  
M24612  
ual relay. You must do this for each relay that  
you want to reset to zero. See “1.3.4.3. RESET  
RT (run time)” on page 24.  
Fig. 50. Setup - Outputs - Options - Show Runtime.  
SETUP  
OUTPUTS  
OPTIONS  
1.3.3.5. Exit Options Setup  
Press the W button to exit the Options set up and return to  
the Outputs menu.  
USE SCHED  
MIN OFF  
DI OPTION  
SHOW RT  
EXIT  
or  
Use the S and T buttons to highlight EXIT and press the  
X button.  
Continue with “1.3.4. Setting up the Relays”.  
M24613  
Fig. 51. Setup - Outputs - Options - Exit.  
SETUP  
SETUP  
1.3.4. Setting up the Relays  
OUTPUTS  
RELAY 1  
OUTPUTS  
RELAY 1  
1. From the Outputs menu, use the S and T buttons  
to highlight the desired relay (1 or 2).  
2. Press the X button to display the selected Relay  
menu.  
SCHEDULE  
RESET  
RESET RT  
EXIT  
Continue with the remainder of this section to setup the  
relay outputs.  
M24614  
Fig. 52. Setup - Outputs - Relay Menu.  
SETUP  
OUTPUTS  
RELAY 1  
SCHEDULE  
SETUP  
OUTPUTS  
RELAY 1  
1.3.4.1. SCHEDULE  
This selection displays only if “Use Sched = YES” is  
selected during the Output Options setup (see page 21).  
When selected, individual outputs default to follow the  
schedule.  
SCHEDULE  
YES  
NO  
1. Press the X button to display the Schedule values.  
2. Use the S and T buttons to select YES or NO.  
Default: YES  
USE  
SCHEDULE  
FOR  
3. Press the X button to accept the value and return to  
the Relay menu.  
An individual output can be selected to be controlled or  
not controlled by the schedule.  
OUTPUTS  
M24615  
Fig. 53. Setup - Outputs - Relay - Schedule.  
If NO is selected, the Setback selection does not appear  
in the Program menu for this output.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
SETUP  
SETUP  
OUTPUTS  
1.3.4.2. RESET  
OUTPUTS  
RELAY 1  
RESET  
RELAY 1  
RESET  
IMPORTANT  
For relays to use the Reset function of the con-  
YES  
NO  
troller, both modulating outputs (MOD 1 and  
MOD 2) must be set for Reset.  
Relays that have Reset set to YES use the reset curve  
configured for MOD 1.  
USE  
RESET  
FOR  
1. Press the X button to display the Reset values.  
2. Use the S and T buttons to select YES or NO.  
Default: NO  
RELAY 1  
M24616  
Fig. 54. Setup - Outputs - Relay - Reset.  
3. Press the X button to accept the value and return to  
the Relay menu.  
•
•
If you select YES, then all other outputs display this  
Setup option and will use the reset curve programmed  
for the first output.  
If you select NO, then No Reset is configured for that  
output and all other subsequent outputs.  
SETUP  
SETUP  
OUTPUTS  
1.3.4.3. RESET RT (run time)  
OUTPUTS  
RELAY 1  
RELAY 1  
RESET RT  
This selection displays only if “Show RT = YES” is  
selected during Output Options setup (see page 23).  
RESET RT  
YES  
NO  
1. Press the X button to display the Reset RT values.  
2. Use the S and T buttons to select YES or NO.  
Default: NO  
3. Press the X button to accept the value and return to  
the Relay menu.  
RESET  
RUN TIME  
FOR  
Selecting YES immediately resets the output run time  
hours to zero for this output. When you subsequently  
return to this screen, the RESET RT defaults to NO.  
RELAY 1  
M24617  
Fig. 55. Setup - Outputs - Relay - Reset Runtime.  
NOTE: Run times can be reset to zero for each individ-  
ual relay. You must do this for each relay that  
you want to reset to zero.  
1.3.4.4. EXIT Relay Setup  
Press the W button to exit the selected relay set up and  
SETUP  
OUTPUTS  
RELAY 1  
return to the Outputs menu.  
RESET  
SCHEDULE  
RESET RT  
EXIT  
To setup the next relay output go to “1.3.4. Setting up the  
Relays” on page 23.  
When you finish setting up the relay outputs, continue  
with “1.4. Exiting Setup”.  
M24618  
Fig. 56. Setup - Outputs - Relay - Exit.  
1.4. Exiting Setup  
Press the HOME button to exit Setup mode and return to  
the home screen display.  
or  
Use the S and T buttons to highlight EXIT from the menu  
and press the X button.  
This completes the Setup procedure.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
NOTE: For applications where Reset is not used, only  
2. PROGRAMMING OUTPUTS  
one sensor (Sensor A) is available for use.  
(MOD AND RELAY) WITH NO  
RESET  
The T775U can be programmed for Reset or No Reset.  
From the factory, the T775U is programmed for No Reset.  
This section describes the steps necessary to program  
the controller for No Reset.  
2.1. Entering Program Mode  
MENU  
PROGRAM  
Press the MENU button, then select PROGRAM and  
MENU  
press the X button to view the Program menu.  
PROGRAM  
MOD 1  
MOD 2  
RELAY 1  
RELAY 2  
EXIT  
M24567  
Fig. 57. Program Menu.  
2.1.1. Program Menu for Outputs with  
No Reset  
MENU  
PROGRAM  
MOD 1  
PROGRAM  
MOD 1  
From the Program menu, select MOD 1, MOD 2,  
RELAY 1, or RELAY 2 to view the parameters. This  
section illustrates the screens for selecting MOD 1, but  
other than as noted below, the programming is the same  
for each output.  
SETPOINT  
SETBACK  
SENSOR  
THROT RNG  
ACTION  
EXIT  
NOTE: For Relays, DIFFRNTL replaces THROT RNG.  
NOTE: The Setback parameter displays only if schedul-  
ing is enabled (see Fig. 47 on page 21) or the DI  
Option is set to Setback. (see Fig. 49 on  
page 22).  
M24580A  
Fig. 58. Program Menu - No Reset.  
Continue with “2.1.2. SETPOINT”.  
MENU  
PROGRAM  
PROGRAM  
2.1.2. SETPOINT  
MOD 1  
SETPOINT  
MOD 1  
SETPOINT  
1. From the menu, use the S and T buttons to high-  
light SETPOINT.  
2. Press the X button to display the setpoint value.  
3. Use the S and T buttons to increase/decrease the  
desired setpoint temperature.  
o
F
Default: 70°F (21°C)  
70  
Range: -40°F to 248°F (-40°C to 120°C)  
4. Press the X button to accept the setpoint tempera-  
ture and display the next option.  
ENTER  
SETPOINT  
FOR  
MOD 1  
M24581  
Fig. 59. Program - Setpoint.  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
MENU  
PROGRAM  
MOD 1  
SETBACK  
2.1.3. SETBACK  
The Setback temperature option displays only if  
scheduling is enabled (see Fig. 47 on page 21) or the DI  
Option is set to Setback. (see Fig. 49 on page 22).  
PROGRAM  
MOD 1  
SETBACK  
This is the desired setpoint temperature that you want to  
use during setback mode for this output. For example, if  
your setpoint is 70°F and you want the temperature to  
drop 10°F during setback mode, enter 60°F as the set-  
point for this output.  
o
F
60  
ENTER  
SETBACK  
SETPOINT  
FOR MOD 1  
1. From the menu, use the S and T buttons to high-  
light SETBACK.  
M24584  
2. Use the S and T buttons to increase/decrease the  
Fig. 60. Program - Setback.  
desired setpoint temperature.  
Default: 60°F (16°C)  
Range: -40°F to 248°F (-40°C to 120°C)  
3. Press the X button to accept the value and display  
the menu.  
MENU  
2.1.3. SENSOR  
PROGRAM  
MOD 1  
SENSOR  
PROGRAM  
MOD 1  
This sub-menu choice is only available on the T775U2016  
model.  
SENSOR  
SENSOR A  
SENSOR B  
1. From the menu, use the S and T buttons to high-  
light SENSOR A or SENSOR B.  
2. Press the X button to accept the sensor selection  
and display the next option.  
SELECT  
SENSOR  
FOR  
MOD 1  
M28660  
Fig. 61. Program - Sensor.  
MENU  
PROGRAM  
MOD1  
2.1.5. THROTTLING RANGE or  
DIFFERENTIAL  
PROGRAM  
MOD 1  
THROT RNG  
THROT RNG  
Throttling Range displays for Modulating outputs.  
Differential is used for the Relay outputs.  
1. From the menu, use the S and T buttons to high-  
light THROT RNG or DIFFERNTL.  
2. Press the X button to display the throttling range  
value.  
o
F
20  
ENTER  
THROTLLING  
RANGE FOR  
MOD 1  
3. Use the S and T buttons to increase/decrease the  
desired value.  
Default: 20°F (-6.6°C)  
M24582  
Range: 1°F to 150°F (1°C to 66°C)  
4. Press the X button to accept the value and display  
the next option.  
Fig. 62. Program - Throttling Range or Differential.  
The Throttling Range brackets the setpoint setting, e.g., if  
the setpoint is 72°F and the throttling range is 10°F, then  
the effective throttling temperature range is 67°F to 77°F.  
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.  
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.  
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26  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
MENU  
PROGRAM  
MOD 1  
2.1.6. ACTION  
PROGRAM  
MOD 1  
ACTION  
ACTION  
1. From the menu, use the S and T buttons to high-  
light ACTION.  
HEAT  
COOL  
Default: HEAT  
REV ACT  
DIR ACT  
HUMID  
2. Press the X button to display the action selections.  
3. Use the S and T buttons to select the desired  
value.  
DEHUMID  
4. Press the X button to accept the highlighted selec-  
SELECT  
tion and display the next option.  
ACTION  
FOR  
MOD 1  
M24583  
Fig. 63. Program - Action.  
2.2. Program Next Output (Modulating  
Output or Relay)  
For the next output, select the desired MOD or Relay from  
the Program menu (see Fig. 57 on page 25).  
Go to “2.1.2. SETPOINT” on page 25 to continue  
programming.  
When you finish programming the outputs, continue with  
“1.3. Exit Programming without Reset”.  
1.3. Exit Programming without Reset  
Press the HOME button to leave programming mode and  
return to the home screen.  
This completes the programming procedure for  
controllers that do not use Reset.  
27  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
NOTE: Even if the MOD outputs are not used, both  
3. PROGRAMMING OUTPUTS  
(MOD AND RELAY) WITH  
RESET  
MOD 1 and MOD 2 must be set to Reset in order  
to configure Reset for the relay(s).  
The reset curve established when programming the first  
output (MOD 1) is then used for all subsequent outputs  
that are configured for Reset, and each of those outputs  
will be offset from this curve.  
The T775U can be programmed for Reset or No Reset for  
each output. From the factory, the T775U is programmed  
for No Reset. This section describes the steps necessary  
to program the controller for Reset.  
For all outputs that will follow a reset curve, be sure to  
configure for Reset=YES in the setup mode. Choose  
Reset YES or NO for all other outputs you wish to reset,  
then press the HOME button to record your selection.  
To use the Reset feature, the first output (MOD 1) must be  
set to Reset=YES in Setup mode (see “3.1. Setting Up the  
Controller for Reset”).  
SETUP  
OUTPUTS  
MOD 1  
RESET  
SETUP  
NOTE: The first output, Mod 1, must be set for Reset to  
enable the controller’s Reset function.  
OUTPUTS  
MOD 1  
RESET  
YES-BOILER  
YES-OTHER  
NO  
3.1. Setting Up the Controller for Reset  
1. Press and hold the MENU button for five seconds to  
enter Setup mode.  
2. Then choose:  
OUTPUTS X  
MOD1 X  
RESET X  
USE RESET  
FOR  
MOD 1  
then select YES-BOILER or YES-OTHER (Fig. 64).  
M24568  
You can now press the HOME button to exit Setup mode  
and continue with “Determining and Setting the Reset  
Values”.  
Fig. 64. Reset Setup.  
•
With the above settings example, when the outdoor  
temperature is 50°F, the effective setback setpoint is  
170°F (180°F setpoint minus the 10°F setback).  
Determining and Setting the Reset  
Values  
NOTE: A single reset curve is programmed for the  
MOD 1 output and is used by all outputs setup  
with RESET=YES.  
NOTE: When using the Reset feature, Sensor A must  
be sensing the controlled temperature (e.g.  
Boiler), Sensor B must be sensing the resetting  
temperature (e.g. outdoor temp).  
To program an output for Reset, refer to the values as  
shown in the examples below. Choose your own  
appropriate values for Sensor A maximum and minimum  
and Sensor B maximum and minimum.  
CAUTION  
If using the time clock or DI to go to setback,  
the T775P will shift the reset curve up or down  
and cause the controlled setpoint to exceed  
either the entered reset max. temp or min.  
temp (dropping below reset minimum is most  
common, since setback is normally below  
setpoint). If this is not desired, either do not  
use setback, or adjust the min. and max.  
values entered so that critical setpoints are  
not exceeded in the setback mode.  
Reset Example: (see Fig. 65)  
•
•
•
•
Sensor A is the boiler sensor and Sensor B is the  
outdoor sensor.  
Maximum boiler temperature desired is 210°F when  
the outdoor temperature is 20°F.  
Minimum boiler temperature desired is 160°F when the  
outdoor temperature is 70°F.  
With the above settings example, when the outdoor  
temperature is 50°F, the effective setpoint is 180°F.  
When Reset is programmed, the home screen displays  
the calculated Heat/Cool setpoint(s) for the Mod and  
Relay outputs based on the reset curve. See Fig. 21 on  
page 12.  
Setback (optional) Example: (see Fig. 65)  
•
Setback of -10°F is used to drop the temperature at  
night by 10°F.  
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28  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
NOTE: For MOD 2 and the Relays, a setpoint offset is  
used. See “3.3.1. SETPOINT OFFSET (MOD 2  
only)” on page 32.  
°F  
220  
SP MAX A1  
The remainder of this section beginning with “3.2.  
Program Menus for Outputs with Reset” on page 29  
describes the individual parameters for configuring  
outputs with Reset.  
(BOILER MAX)  
210  
200  
190  
180  
170  
160  
150  
140  
S
E
N
S
O
R
For your reference, the following Reset programming  
procedure uses the values in Fig. 65 above.  
A
SETBACK  
OFFSET  
-10°F  
SP MIN A2  
(BOILER MIN)  
10  
30 40 50 60  
80 °F  
20  
70  
RESET B1  
(OUTSD MIN)  
RESET B2  
(OUTSD MAX)  
SENSOR B  
Fig. 65. Reset Curve for MOD 1 with Setback Offset.  
M24570  
MOD 1 RESET:  
YES-OTHER AND  
MOD 1 RESET:  
YES-BOILER AND  
3.2. Program Menus for Outputs with  
Reset  
DI OPTION = SETBACK  
DI OPTION = SETBACK  
Press the MENU button, select PROGRAM, then highlight  
MENU  
PROGRAM  
MOD 1  
MENU  
PROGRAM  
MOD 1  
MOD 1 and press the X button to view the parameters.  
PROGRAM  
MOD 1  
OR  
The Reset curve settings (Fig. 67 through Fig. 70) are  
programmed for the first output (MOD 1) and these  
settings apply to all outputs that are configured for Reset.  
See Fig. 65 for the reset curve values used in the  
following section.  
SP MAX A1  
RESET B1  
SP MIN A2  
RESET B2  
THROT RNG  
ACTION  
BOILR MAX  
OUTSD MIN  
BOILR MIN  
OUTSD MAX  
THROT RNG  
ACTION  
SETBACK  
EXIT  
SETBACK  
EXIT  
NOTE: The Setback parameter displays only if schedul-  
ing is enabled (see Fig. 47 on page 21) or the DI  
Option is set to Setback (see Fig. 49 on  
page 22).  
M24571  
Fig. 66. Setpoint Values for Reset and Setback.  
MENU  
3.2.1. SP MAX A1 or BOILER MAX  
PROGRAM  
MOD 1  
SP MAX A1  
PROGRAM  
MOD 1  
(Setpoint maximum for Sensor A)  
SP MAX A1  
1. From the menu, use the S and T buttons to high-  
light BOILER MAX or SP MAX A1.  
2. Press the X button to display the maximum setpoint  
value.  
210 o  
ENTER  
MAXIMUM  
SETPOINT FOR  
SENSOR A  
F
3. Use the S and T buttons to increase/decrease the  
desired maximum setpoint temperature.  
Default: 180°F (82°C)  
Range: -40°F to 248°F (-40°C to 120°C)  
4. Press the X button to accept the setpoint tempera-  
ture and display the next option.  
M24572  
Fig. 67. Program - Sensor A Max. Setpoint.  
MENU  
PROGRAM  
PROGRAM  
3.2.2. RESET B1 or OUTSD MIN  
MOD 1  
RESET B1  
MOD 1  
RESET B1  
(Sensor B value when at SP MAX A1 Setpoint)  
1. From the menu, use the S and T buttons to high-  
light RESET B1 or OUTSD MIN.  
2. Press the X button to display the setpoint value.  
3. Use the S and T buttons to increase/decrease the  
desired setpoint temperature.  
o
F
20  
Default: 10°F (-12°C)  
Range: -40°F to 248°F (-40°C to 120°C)  
4. Press the X button to accept the value and display  
the next option.  
ENTER  
SENSOR B VALUE  
FOR MAXIMUM  
SETPOINT  
M24573  
Fig. 68. Program -Sensor B Max. Setpoint.  
29  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
MENU  
PROGRAM  
MOD 1  
SP MIN A2  
3.2.3. SP MIN A2 or BOILER MIN  
PROGRAM  
MOD 1  
(Setpoint minimum for Sensor A)  
SP MIN A2  
1. From the menu, use the S and T buttons to high-  
light BOILER MIN or SP MIN A2.  
2. Press the X button to display the setpoint value.  
3. Use the S and T buttons to increase/decrease the  
desired minimum setpoint temperature.  
Default: 140°F (60°C)  
Range: -40°F to 248°F (-40°C to 120°C)  
4. Press the X button to accept the setpoint tempera-  
ture and display the next option.  
160 o  
ENTER  
MINIMUM  
SETPOINT FOR  
SENSOR A  
F
M24574  
Fig. 69. Program - Sensor A Min. Setpoint.  
MENU  
3.2.4. RESET B2 or OUTSD MAX  
PROGRAM  
MOD 1  
RESET B2  
PROGRAM  
MOD 1  
(Sensor B value when at MIN A2 Setpoint)  
RESET B2  
1. From the menu, use the S and T buttons to high-  
light RESET B2.  
2. Press the X button to display the setpoint value.  
3. Use the S and T buttons to increase/decrease the  
desired setpoint temperature.  
o
F
70  
Default: 60°F (16°C)  
ENTER  
Range: -40°F to 248°F (-40°C to 120°C)  
4. Press the X button to accept the value and display  
the next option.  
SENSOR B VALUE  
FOR MINIMUM  
SETPOINT  
M24575  
Fig. 70. Program - Sensor B Min. Setpoint.  
MENU  
PROGRAM  
PROGRAM  
3.2.5. THROTTLING RANGE or  
DIFFERENTIAL  
MOD 1  
MOD  
1
THROT RNG  
THROT RNG  
Throttling Range displays for Modulating outputs.  
Differential is used for the Relay outputs.  
1. From the menu, use the S and T buttons to high-  
light THROT RNG or DIFFERNTL.  
2. Press the X button to display the throttling range  
value.  
o
F
20  
ENTER  
THROTTLING  
RANGE FOR  
FOR MOD 1  
3. Use the S and T buttons to increase/decrease the  
desired value.  
Default: 20°F (-6.6°C)  
M24577  
Range: 1°F to 150°F (1°C to 66°C)  
4. Press the X button to accept the value and display  
the next option.  
Fig. 71. Program - Throttling Range or Differential.  
The Throttling Range brackets the setpoint setting, e.g., if  
the setpoint is 72°F and the throttling range is 10°F, then  
the effective throttling temperature range is 67°F to 77°F.  
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.  
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.  
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30  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
MENU  
PROGRAM  
RELAY 1  
ACTION  
3.2.6. ACTION  
PROGRAM  
RELAY 1  
ACTION  
For the MOD 1 output (and for outputs with RESET=NO),  
the ACTION selection displays.  
HEAT  
COOL  
For all other outputs with RESET=YES, the ACTION  
selection does not display; continue with “3.2.7.  
SETBACK OFFSET (if configured)” on page 31.  
REV ACT  
DIR ACT  
HUMID  
DEHUMID  
1. From the menu, use the S and T buttons to high-  
light ACTION.  
Default: HEAT  
2. Press the X button to display the action selections.  
SELECT  
ACTION  
FOR  
RELAY 1  
M24578  
3. Use the S and T buttons to select the desired  
value.  
Fig. 72. Program - Action Selection.  
4. Press the X button to accept the highlighted selec-  
tion and display the next option.  
MENU  
PROGRAM  
PROGRAM  
3.2.7. SETBACK OFFSET (if configured)  
The Setback temperature option displays only if  
scheduling is enabled (see Fig. 47 on page 21) or the DI  
Option is set to Setback. (see Fig. 49 on page 22).  
RELAY 1  
SETBACK  
RELAY 1  
SETBACK  
This value is the number of degrees plus (+) or minus (-)  
that you want the temperature to be offset from the  
setpoint.  
o
F
-10  
ENTER  
SETBACK  
SETPOINT  
FOR RELAY 1  
For example, If you want the temperature to be 10°F less  
than the setpoint during setback mode, enter -10°F. In  
normal operations for heating, the offset will be negative.  
For cooling, the offset will be a positive value.  
M24579  
Fig. 73. Program - Setback (Offset).  
1. From the menu, use the S and T buttons to high-  
light SETBACK.  
2. Use the S and T buttons to increase/decrease the  
desired setpoint temperature.  
Default: 0°F  
Range: -150°F to 150°F (-101°C to 66°C)  
3. Press the X button to accept the value and display  
the menu.  
This completes the programming of the MOD 1 output.  
To program the second Modulating output and the two  
relays, continue with “3.3. Second Modulating Output and  
Relays”.  
31  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
MENU  
3.3. Second Modulating Output and  
Relays  
MENU  
PROGRAM  
MOD 2  
PROGRAM  
MOD 2  
PROGRAM  
MOD 2  
OFFSET  
For the second Modulating Output and the two Relays (if  
they are configured for Reset), the Offset parameter  
displays on the Program menu as shown in Fig. 74.  
OFFSET  
THROT RNG  
ACTION  
SETBACK  
EXIT  
o
F
-10  
3.3.1. SETPOINT OFFSET (MOD 2 only)  
ENTER  
SETPOINT  
OFFSET  
FOR  
This value is the number of degrees plus (+) or minus (-)  
that you want the temperature to be offset from the  
MOD 1 setpoint. See Fig. 75. For example, If you want  
the MOD 2 setpoint to be 10°F less than the MOD 1  
setpoint, enter -10°F.  
MOD 2  
M24547  
Fig. 74. Program - Setpoint Offset (MOD 2 only).  
1. From the menu, use the S and T buttons to  
highlight OFFSET.  
2. Press the X button to display the value.  
3. Use the S and T buttons to increase/decrease the  
desired temperature.  
°F  
220  
SP MAX A1  
OFFSET Default: 0°F  
(BOILER MAX)  
210  
OFFSET Range: -150°F to 150°F (-101°C to 66°C)  
4. Press the X button to accept the value and display  
the next option.  
MOD 1  
S
200  
SETPOINT  
E
N
190  
S
O
R
180  
170  
3.3.2. Second Modulating Output and  
Relays Programming  
To complete the programming of MOD 2 or a Relay,  
perform the procedures in “3.2.5. THROTTLING RANGE  
or DIFFERENTIAL” through “3.2.7. SETBACK OFFSET  
(if configured)” beginning on page 30.  
A
MOD 2  
SETPOINT  
OFFSET  
-10°F  
SP MIN A2  
(BOILER MIN)  
160  
150  
140  
10  
30 40 50 60  
80 °F  
20  
70  
RESET B1  
(OUTSD MIN)  
RESET B2  
(OUTSD MAX)  
3.4. Exit Programming with Reset  
When you finish programming the Modulating outputs and  
the Relays, press the HOME button to leave programming  
mode and return to the home screen.  
SENSOR B  
M24569  
Fig. 75. Reset Curve with Offset for MOD 2.  
This completes the programming procedure for  
controllers that use Reset.  
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32  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
4. SCHEDULING  
Scheduling provides the ability to set daily temperature  
settings for up to two events per day. Typically, these are  
the daytime (setpoint) and the nighttime (setback)  
settings.  
1.  
2.  
If you press the HOME button or there is no  
keypad activity for four minutes, you exit  
Scheduling mode and return to the home  
screen.  
If you press the MENU button, you exit  
Scheduling mode and return to the menu.  
IMPORTANT  
To enable Scheduling, you must first enter Setup  
mode (press and hold the MENU button for 5  
seconds), select OUTPUTS, select OPTIONS,  
select USE SCHED, and then select YES. (see  
“1.3.3.1. USE SCHED” on page 21).  
To create or change a schedule, you use the —  
•
•
•
Left arrow button(W) to scroll backward through the  
Setup menus  
Right arrow button (X) to select the highlighted menu  
item and display its content  
IMPORTANT  
To properly account for Daylight Saving time, be  
sure to set the Date before setting the Time.  
See “4.2.2. SET DATE” on page 34.  
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 setup parameter  
NOTE: The T775U controller interface is intuitive. You  
may find that you do not need the following  
scheduling instructions. You may want to use  
this procedure simply as a reference to locate  
the particular option or parameter of interest.  
Creating a Schedule  
To create a schedule, perform the following in the order  
listed:  
1. Enable Scheduling in Setup mode - see “1.3.3.1.  
USE SCHED” on page 21  
2. Enter Schedule mode — see “4.1. Entering Sched-  
ule Mode”  
3. Set the Schedule Options — see “4.2. OPTIONS”  
4. Set Individual Schedules — begin with “4.3. Setting  
Individual Schedules” on page 35  
5. Exit Schedule Mode — see “4.4. Exiting Scheduling  
Mode” on page 36  
NOTE: Each output is independently configurable to  
follow the schedule or not. For modulating  
outputs, see “1.3.1.5. SCHEDULE” on page 19.  
For relay outputs, see “1.3.4.1. SCHEDULE” on  
page 23.  
NOTES:  
4.1. Entering Schedule Mode  
MENU  
SCHEDULE  
MENU  
SCHEDULE  
Press the MENU button, then select SCHEDULE and  
press the X button to view the Schedule menu.  
OPTIONS  
MON-FRI  
SAT-SUN  
MONDAY  
TUESDAY  
WEDNESDAY  
THURSDAY  
FRIDAY  
SATURDAY  
SUNDAY  
EXIT  
M24620  
Fig. 76. Schedule - Menu.  
MENU  
4.2. OPTIONS  
MENU  
SCHEDULE  
OPTIONS  
SCHEDULE  
OPTIONS  
1. From the Schedule menu, use the S and T buttons  
to highlight OPTIONS.  
2. Press the X button to display the Options menu.  
SET TIME  
SET DATE  
DAYLIGHT  
EXIT  
M24621  
Fig. 77. Schedule - Options Menu.  
33  
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T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
MAIN  
MAIN  
4.2.1. SET TIME  
Setting the system time is required to enable the  
controller to follow daylight saving time.  
SCHEDULE  
OPTIONS  
SET TIME  
SCHEDULE  
OPTIONS  
SET TIME  
IMPORTANT  
Set the Date before setting the Time. See  
“4.2.2. SET DATE”.  
08:12 AM  
1. From the Options menu, use the S and T buttons  
to highlight SET TIME.  
2. Press the X button to display the current system  
time setting.  
3. Use the X button to cycle between the hour,  
minute, and AM/PM values.  
4. Use the S and T buttons to increase/decrease the  
desired value for the hour, minute, and AM/PM.  
5. Press the W button to accept the Time and return to  
the Options menu.  
SET  
SYSTEM  
TIME  
M24622  
Fig. 78. Schedule - Options - System Time.  
MAIN  
MAIN  
4.2.2. SET DATE  
Setting the system date is required to enable the  
controller to follow daylight saving time.  
SCHEDULE  
OPTIONS  
SET DATE  
SCHEDULE  
OPTIONS  
SET DATE  
IMPORTANT  
To properly account for Daylight Saving time, be  
sure to set the Date before setting the Time.  
01/01/2007  
1. From the Options menu, use the S and T buttons  
to highlight SET DATE.  
2. Press the X button to display the current system  
SET  
SYSTEM  
DATE  
date setting.  
M24623  
3. Use the X button to cycle between the month, day,  
and year values.  
4. Use the S and T buttons to increase/decrease the  
desired value for the month, day, and year.  
5. Press the W button to accept the Date and return to  
the Options menu.  
Fig. 79. Schedule - Options - System Date.  
MAIN  
MAIN  
SCHEDULE  
SCHEDULE  
4.2.3. DAYLIGHT (daylight saving time)  
OPTIONS  
OPTIONS  
DAYLIGHT  
DAYLIGHT  
1. From the Options menu, use the S and T buttons  
to highlight DAYLIGHT.  
2. Press the X button to display the current system  
YES  
NO  
setting for daylight saving time.  
3. Use the S and T buttons to select YES or NO.  
Default: YES  
4. Press the X button to accept the value and return to  
USE  
DAYLIGHT  
SAVING  
TIME  
the Options menu.  
5. From the Options menu, use the Use the S and T  
buttons to highlight EXIT.  
M24624  
6. Press the X button to return to the Schedule menu.  
Fig. 80. Schedule - Options - Daylight Saving Time.  
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34  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
MENU  
4.3. Setting Individual Schedules  
MENU  
SCHEDULE  
MON-FRI  
SCHEDULE  
MON-FRI  
As shown in the Schedule menu (Fig. 76 on page 33),  
schedules can be set for the following time periods:  
E1 SETPT  
•
•
•
Monday through Friday  
Saturday and Sunday  
Individual days of the week  
E1 TIME  
E2 SETPT  
E2 TIME  
EXIT  
1. From the Schedule menu, use the S and T buttons  
to highlight the desired time period.  
2. Press the X button to display the Schedule menu  
for the selected time period.  
M24625  
For each selected time period, the schedule event (E1  
and E2) parameters are exactly the same as shown in  
Fig. 81.  
Fig. 81. Schedule Event Menu (Showing MON-FRI).  
SCHEDULING EXAMPLE  
Setting the schedule is independent of the temperature  
settings for the relay outputs. Table 5 illustrates a weekly  
schedule for daytime (setpoint) and night time (setback)  
use and shows the factory default settings.  
Table 5. Mon-Fri Schedule Defaults  
DAY  
EVENT  
SETPT ACTION  
TIME  
6:00 AM  
6:00 PM  
a
b
Mon-Fri Event 1 (E1)  
Mon-Fri Event 2 (E2)  
Setpoint  
Setback  
Sat-Sun  
Not used; remains in Setback from the  
Mon-Fri E2 settings  
a
Setpoint time span is 6:00 AM until 5:59 PM because  
setback starts at 6:00 PM.  
b
Setback time span is 6:00PM until 5:59 AM because  
setpoint starts at 6:00 AM.  
To set a schedule, continue with “4.3.1. E1 SETPT  
(setpoint for event 1)”.  
The following figures show the MON-FRI menu, but the  
menu selections are the same for any time period.  
MAIN  
MENU  
SCHEDULE  
SCHEDULE  
4.3.1. E1 SETPT (setpoint for event 1)  
MON-FRI  
MON-FRI  
E1 SETPT  
E1 SETPT  
1. From the selected time period menu, use the S and  
T buttons to highlight E1 SETPT.  
2. Press the X button to display the setpoint options.  
3. Use the S and T buttons to highlight the desired  
option.  
SETPOINT  
SETBACK  
NOT USED  
4. Press the X button to accept the value and return to  
the selected time period menu.  
SELECT  
SETPOINT  
FOR  
EVENT 1  
M24626  
Fig. 82. Schedule - Event 1 Setpoint.  
35  
62-0255—07  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
MAIN  
MAIN  
4.3.2. E1 TIME (time for event 1)  
SCHEDULE  
MON-FRI  
E1 TIME  
SCHEDULE  
MON-FRI  
E1 TIME  
1. From the selected time period menu, use the S and  
T buttons to highlight E1 TIME.  
2. Press the X button to display the current time set-  
ting for event 1.  
3. Use the X button to cycle between the hour,  
minute, and AM/PM values.  
6:00 AM  
4. Use the S and T buttons to increase/decrease the  
desired value for the hour, minute, and AM/PM.  
5. Press the W button to accept the time and return to  
the selected time period menu.  
SET  
TIME  
FOR  
EVENT 1  
M24627  
Fig. 83. Schedule - Event 1 Time.  
4.3.3. E2 SETPOINT (setpoint for event 2)  
Creating the setpoint for event 2 is accomplished the  
same way as the first event. See “4.3.1. E1 SETPT  
(setpoint for event 1)” on page 35 above.  
4.3.4. E2 TIME (time for event 2)  
Creating the time for event 2 is accomplished the same  
way as the first event. See “4.3.2. E1 TIME (time for event  
1)” above.  
4.3.5. EXIT (exit from selected time period  
settings)  
After entering the time for event 2, use the W button to exit  
the schedule time period and return to the Schedule menu  
to select a different time period.  
When you finish scheduling the time periods, continue  
with “4.4. Exiting Scheduling Mode”.  
4.4. Exiting Scheduling Mode  
Press the HOME button to exit the Schedule menu and  
return to the home screen display.  
or  
Press the W button to return to the menu, then use the S  
and T buttons to highlight EXIT from the menu and press  
the X button.  
MENU  
PROGRAM  
SCHEDULE  
SUMMARY  
EXIT  
This completes the Scheduling procedure.  
M24628  
Fig. 84. Scheduling Mode Exit.  
62-0255—07  
36  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
Error Message  
There is a two-character error code that displays in  
response to controller software problems:  
SUMMARY MENU  
The Summary menu provides the ability to view the  
schedule (E1 and E2 times) for each relay for each day of  
the week.  
EE  
EEPROM Failure— The values read back from  
NOTE: Scheduling must be enabled for the Summary  
menu to display. Enabling the schedule is  
determined in the Setup process for the Output  
Options (see page 21).  
the EEPROM are not the same as written into the  
EEPROM. This error cannot be field repaired. Replace  
the device.  
Diagnostic Messages  
There are two diagnostic messages that can display in  
response to sensor problems. The diagnostic codes that  
can flash on the display are:  
MENU  
MENU  
SUMMARY  
SUMMARY  
– –  
MONDAY  
Sensor Open or Shorted — Two dashes display  
when a sensor (typically temperature) is open or  
shorted. An open circuit is considered anything  
greater than 1570 ohms (greater than 300F), shorted  
anything less than 770 ohms (less than -73F). Which-  
ever stages are operating with this sensor cease to  
control (meaning relays go to OFF and proportional  
outputs go to zero percent).  
RELAY 1-2  
E1: 06:00AM (72)  
E2: 06:00PM (65)  
M24629  
Fig. 85. Summary Example - Monday Settings.  
This message can also mean that the sensor is pro-  
grammed, but not physically connected.  
For each relay, the Summary display indicates the time  
and temperature (in parenthesis) for each of the two  
scheduled events E1 and E2.  
-60°F or 270°F (-51°C or 132°C) Blinking  
Temperature Out of Range — The temperature  
display blinks when the sensed temperature range is  
outside of the display range, below -60°F (-51°C) or  
above 270°F (132°C). The displayed value remains at  
that displayed limit and control continues. Controller  
continues to function unless an open or shorted state  
is detected.  
1. Press the MENU button to view the menu.  
2. Use the S and T buttons to highlight SUMMARY.  
3. Press the X button to display the Summary  
settings.  
4. Use the X button to scroll forward through each day  
of the week (Monday, Tuesday, Wednesday,  
Thursday, Friday, Saturday, and Sunday).  
5. While viewing a specific day, use the S and T  
buttons to cycle through the individual relay  
schedules for that day.  
Blinking relay status  
Relay Minimum Off Time is Active — On the home  
screen, each relay’s indicator („) blinks while the  
relay’s minimum off time is active.  
When finished, press the HOME button to return to the  
home display screen.  
SPECIFICATIONS  
If programmed for Reset control, the Summary setpoints  
display as “RES” instead of a temperature value. For  
example, the display would show:  
MONDAY  
Power: 24, 120, or 240 Vac; 50/60 Hz  
A separate earth ground is required for any power  
source.  
STAGES  
Power Consumption:  
E1: 06:00AM (RES) - indicating Reset  
E2: 06:00PM (05)  
•
•
8 VA maximum at 60 Hz  
10 VA maximum at 50 Hz  
- setback/offset degrees  
Operating & Storage Temperature Ambient Rating:  
TROUBLESHOOTING  
•
•
-40°F to 125°F (-40°C to 52°C) @ 50 Hz  
-40°F to 140°F (-40°C to 60°C) @ 60 Hz  
Power Loss  
Relative Humidity: 5% to 95% non-condensing  
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.  
Relay Contact Output Ratings (N.O. and N.C.):  
•
•
•
•
1/2 hp; 9.8 AFL, 58.8 ALR @ 120 Vac  
1/2 hp; 4.9 AFL, 29.4 ALR @ 240 Vac  
125 VA pilot duty @ 120/240 Vac  
10A @ 24 Vac (resistive)  
Errors and Diagnostics  
The controller provides an error message and diagnostic  
status as described below.  
Modulating Outputs:  
•
•
•
•
•
0-10 Vdc; drive a minimum of 2,000 Ohms  
2-10 Vdc; drive a minimum of 2,000 Ohms  
4-20 mA; drive a maximum of 600 Ohms  
Electronic Series 90  
Floating  
37  
62-0255—07  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
reasonable protection against harmful interference in  
DoC  
residential installations. This equipment generates, uses,  
and can radiate radio frequency energy, and if not  
installed and used in accordance with the instructions,  
may cause harmful interference to radio communications.  
Emissions Compliance  
EN 55022: 2006  
CISPR 22: 2006  
VCCI V-3/2006.04  
ICES-003, Issue 4: 2004  
FCC PART 15 SUBPART B Class B Limit  
However, there is no guarantee that interference will not  
occur in a particular installation. If this equipment does  
cause interference to radio or television equipment  
reception, which can be determined by turning the  
equipment off and on, the user is encouraged to try to  
correct the interference by one or more of the following  
measures:  
— Reorient or relocate the receiving antenna  
— Move the equipment away from the receiver  
— Plug the equipment into an outlet on a circuit different  
from that to which the receiver is connected  
— Consult the dealer or an experienced radio/television  
technician for additional suggestions  
Immunity Compliance  
EN 61000-6-1: 2001 covering  
EN 61000-4-2: 1995 + A1: 1998 + A2: 2001  
EN 61000-4-3: 2002  
EN 61000-4-4: 2004  
EN 61000-4-5: 1995 + A1: 2001  
EN 61000-4-6: 1996 + A1: 2001  
EN 61000-4-8: 1993 + A1: 2001  
EN 61000-4-11 2nd Ed.: 2004  
You are cautioned that any change or modifications to the  
equipment not expressly approve by the party responsible  
for compliance could void Your authority to operate such  
equipment.  
Safety Compliance  
UL 60730-1 for US and Canada  
This device complies with Part 15 of the FCC Rules.  
Operation is subjected to the following two conditions 1)  
this device may not cause harmful interference and 2) this  
device must accept any interference received, including  
interference that may cause undesired operation.  
FCC Compliance Statement:  
This equipment has been tested and found to comply with  
limits for a Class B digital device, pursuant to Part 15 of  
the FCC rules. These limits are designed to provide  
62-0255—07  
38  
 
T775U SERIES 2000 CONTROLLER  
39  
62-0255–07  
 
T775U SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLER  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
Golden Valley, MN 55422  
Honeywell Limited-Honeywell Limitée  
35 Dynamic Drive  
® U.S. Registered Trademark  
© 2009 Honeywell International Inc.  
62-0255—07 E.K. Rev. 10-09  
Printed in U.S.A.  
Toronto, Ontario M1V 4Z9  
customer.honeywell.com  
 

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