Honeywell T775L Series User manual

INSTALLATION INSTRUCTIONS
62-0257-11
E4436
T775L Series 2000 Electronic
Stand-Alone Staging Controller
PRODUCT DESCRIPTION
The T775 electronic stand-alone controllers are the next
generation of commercial and agricultural controls
capable of remote sensing of temperature and providing
switched and/or proportional outputs to various types of
loads. A built-in time clock is standard.
The T775L model can be used to stage multiple relays
from two independent heat or cool setpoints. The number
of stages for each setpoint can be freely chosen, limited
only by the number of relays available.
The T775L can be configured with up to two T775S
Expansion Modules for a maximum of up to 12 stages.
IMPORTANT
The T775L is an operating control, not a limit or
safety control. If used in applications requiring
safety or limit controls, a separate safety or limit
control device is required.
Table 1. T775L Controller Configuration.
Controller Model Description Output Reset
SPDT Relay
Outputs
Digital
Input
Sensor
Inputs
Number of
Sensors
Included
Stage
Control
Addable
T775S Enclosure
T775L2007aStage Sequencer
with Reset
Yes 4b1c21YesYesNEMA1
aThe T775L model can be used to stage multiple relays from two independent heat or cool setpoints. The number of stages for each setpoint can
be freely chosen, limited by the number of relays available (up to 12 stages using two T775S expansion modules).
In addition to the two staged loops, up to two additional relays can be available for independent on-off control.
bThe maximum number of non-sequenced relays is two (2) with each having its own setpoint and its own throttling range. These relays are
available if not being used by the staged relay loops.
cThe T775L includes a digital input for use with the disable or setback option.

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
62-0257—11 2
Temperature Sensorsa
The controller accepts 1,097 Ohms PTC at 77°F (25°C):
• 50021579-001 – Standard sensor (included with all
models except NEMA 4X models)
• T775-SENS-STRAP – Strap-on sensor with wiring box
• T775-SENS-WR – Water resistant with 5 foot leads
(included with NEMA 4X models)
• T775-SENS-WT – Watertight with 6 foot lead
• T775-SENS-OAT – Outdoor air temperature sensor
• C7031B2008 – 6 inch duct mount with wiring box
• C7031D2003 – 5 inch immersion sensor with wiring
box (use immersion well; P/N 50001774-001)
• C7031J2009 – 12 foot duct averaging sensor with
wiring box
• C7046D1008 – 8 inch duct probe with mounting flange
• C7100D1001 – 12 inch fast response, duct averaging
sensor with flange
• C7130B1009 – Room mount sensor
Accessories
• 107324A – Bulb Holder, duct insertion
• 107408 – Heat Conductive Compound, 4 ounce
• 50001774-001 – Immersion Well, stainless steel 304,
1/2 in. threading
Product Changes
Below are the changes to the T775L model starting with
Series 3 (March 2009). Series 3 can be identified by the
sideways 3 after the part number on the device label.
1. MIN ON added.
2. SYNC added.
3. Differential and throttling range increased to 300°F.
4. Setpoint, Enable, and DHW options added to the DI
options.
Controller Dimensions
Fig. 1. T775L Dimensions in inches (mm).
aSee form 62-0265 – Temperature Sensors for the T775
Series 2000 Stand-alone Controller
4 13/32 (112.1) 1/2 (12.4)
3 31/32 (101)
7 23/32
(196)
8 5/32
(207.1)
2 15/16 (74)
7/8 (22.5)
1 (25.5)
4 1/16 (103.4)
4 1/16 (103.4)
1/64 (3.8)
2 11/16 (68.1)
7/8 (22.5)
2 13/16 (71.8)
7/8 (22.5)
1 (25.5)
7/8 (22.5)
M24378
TOP
BOTTOM
LEFT RIGHT
FRONT VIEW

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
3 62-0257—11
BEFORE INSTALLATION
Review the “Specifications” on page 37 before
installing the controller.
When Installing This Product
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazard-
ous condition.
2. Check ratings given in instructions and on the prod-
uct to ensure the product is suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
INSTALLATION AND SETUP
The following installation procedures are typically
performed in the order listed:
1. Mounting – see “Mounting” below.
2. Wiring – see “Wiring” on this page.
3. Checkout – see page 8.
4. Interface and Programming overview – see page 9.
5. Setup – see page 11.
6. Programming the Controller with no Reset – see
page 22
or
Programming the Controller with Reset – page 25.
7. Scheduling (optional) – see page 31.
Additional topics are:
• Temperature sensor calibration begins on page 8.
• Interface overview begins on page 9.
• Summary menu begins on page 36.
• Troubleshooting begins on page 36.
MOUNTING
This section describes the mounting procedures for the
controller and temperature sensor(s).
Controller Mounting
IMPORTANT
Avoid mounting in areas where acid fumes or
other deteriorating vapors can attack the metal
parts of the controller circuit board, or in areas
where escaping gas or other explosive vapors
are present.
IMPORTANT
The controller must be mounted in a position that
allows clearance for wiring, servicing, and
removal.
Use a screwdriver to pry out only the knockouts that you
will use.
If mounting on DIN rail, be sure to remove the knockouts
before mounting. See “Controller Wiring” on page 5 and
Fig. 7 on page 6 for recommended knockout usage and
locations. If you do not use an opened knockout be sure
to cover it.
Mount the controller on any convenient interior location
using the four mounting holes provided on the back of the
enclosure using #6 or #8 screws (screws are not provided
and must be obtained separately). Use controller
dimensions in Fig. 1 on page 2 as a guide.
The controller may be mounted in any orientation.
However, mounting in the orientation shown in Fig. 1
permits proper viewing of the LCD display and use of the
keypad.
Temperature Sensor(s) Mounting
and Location
Temperature sensors may be located up to 1,000 feet
(304 m) from the T775L controller. See Table 3 on page 8
for calibration guidelines.
The sensors may be mounted on a wall or panel for
sensing space temperature, strapped to a pipe or inserted
in an immersion well (see Fig. 2) for hot or cold water
sensing, or taped to a standard cap or bulb holder for duct
air sensing. To prevent moisture or condensation entering
the sensor through the lead wire holes, mount the sensor
with the lead wires exiting the bottom of the sensor.
NOTES:
1. The included sensor is not designed for very
wet applications. For immersion applications,
an immersion well is used.
2. Heat conductive compound must be used in
immersion wells.
3. See “Temperature Sensors” on page 2 for this
type of installation.
Fig. 2. Sensor inserted in immersion well.
NOTE: Multiple sensors may be parallel-series wired to
sense average temperatures in large spaces.
See Fig. 3 on page 4.
WIRING
All wiring must comply with applicable electrical codes
and ordinances, or as specified on installation wiring
diagrams. Controller wiring is terminated to the screw
terminal blocks located inside the device.
The remainder of this section describes the temperature
sensor wiring and the T775L controller wiring.
Wiring Connections Access
To access the wiring connections, remove the two screws
on the left side of the enclosure and gently swing open the
top. Be careful to not stress the ribbon cables that
connect the keypad and LCD display to the controller
circuit board.
SENSOR
PLACED
IN WELL
IMMERSION
WELL
1/2 NPT
USE HEAT
CONDUCTIVE
COMPOUND
M24379

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
62-0257—11 4
Temperature Sensor Wiring
CAUTION
Electrical Shock Hazard.
Can short equipment circuitry.
Make sure that metal tube of sensor does not
short against T terminals in wall-mounted case.
IMPORTANT
Poor wiring practices can cause erratic readings
from the sensor. Avoid the following to ensure
proper operation:
•Do not route the temperature sensor wiring with
building power wiring.
•Do not locate the temperature sensor wiring
next to control contactors.
•Do not locate the temperature sensor wiring
near electrical motors.
•Do not locate the temperature sensor wiring
near welding equipment.
•Make sure good mechanical connections are
made to both the sensor and the controller.
•Do not mount the sensor with the lead wire end
pointing up in an area where condensation
can occur.
If any of the above conditions cannot be
avoided, use shielded cable.
NOTE: Each temperature sensor must be wired to a sin-
gle T775 controller. However, a benefit of the
T775 controller’s accuracy is that there is no
more than a 2°F differential between any two
T775 controllers.
Reset Temperature Control
If you are implementing two-sensor reset control, Sensor
A must always be the controlled temperature and Sensor
B must always be the controlling temperature.
For example, in a reset control based on outside
temperature, Sensor A must be the inside sensor and
Sensor B must be the outside sensor.
Multiple Parallel Sensors
Multiple sensors can be parallel-series wired to sense
average temperatures in large spaces. To maintain
control accuracy, the number of sensors to be parallel-
series wired must be of the n2power (for example, 4, 9,
16, etc.). See Fig. 3.
Fig. 3. Parallel-series wiring of sensors.
Temperature Sensor Wire Type and Size
Temperature sensors use standard AWG 18/2 unshielded
wire. For cable runs greater than 25 feet or where
electrical interference may be a problem, shielded cable
is recommended. See Fig. 4.
Refer to “Temperature Sensor Calibration” on page 8 for
wire size selection where cable runs are longer than 25
feet.
Fig. 4. Sensor Wiring — Showing shielded cable connection to Sensor A.
TO T775 CONNECTIONS (SENSOR A) OR (SENSOR B).
SENSORS
M24380
M24381
SHIELDED
CABLE
SHIELDED
CABLE
NOTE: SHIELDED CABLE MUST BE
CONNECTED TO AN EARTH
GROUND.
HOWEVER, DO NOT GROUND
SHIELDED CABLE AT SENSOR END.
NOTE: TO MINIMIZE NOISE PICKUP,
MAKE SENSOR CONNECTION FROM
SHIELDED CABLE AS CLOSE AS
POSSIBLE TO SENSOR BODY.
SENSOR
T
T
T
T
SENSOR A
SENSOR B
SENSORS A AND B USE THE TWO TT CONNECTIONS AND
ARE POLARITY INSENSITIVE.
1
1

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
5 62-0257—11
Controller Wiring
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect power supply before beginning wiring,
or making wiring connections, to prevent electrical
shock or equipment damage.
CAUTION
Do not use 24 Vac power to power any external
loads if 120 Vac or 240 Vac is used to power
the T775L.
CAUTION
A separate earth ground is required.
Equipment damage can result if the earth ground
is not connected. See Fig. 5 and Table 2 on
page 6.
CAUTION
Equipment Damage Hazard.
Electrostatic discharge can short equipment
circuitry.
Ensure that you are properly grounded before
handling the unit.
Fig. 5. Earth Ground.
IMPORTANT
Poor wiring practices can cause erratic readings
from the sensor. To ensure proper operation,
ensure that good mechanical connections are
made to both the sensor and the controller.
IMPORTANT
When wiring the input power, only one source of
power can be applied to the T775L (24, 120, or
240 Vac).
See Fig. 7 on page 6 for locating the appropriate power
input, remote sensors input, low voltage, contact closure,
and load output terminals.
Access to the terminals can be gained through standard
conduit knockouts (A through E in Fig. 7 on page 6)
located around the perimeter of the enclosure:
• Knockouts A and B should be used only for sensor and
low-voltage wiring.
• Knockouts C, D, and E can be used to gain access to
the load relay output terminals and 120/240 Vac power
wiring.
Controller Wiring Method
Wire the sensors and outputs, then wire the power
connection.
Each terminal can accommodate the following gauges of
wire:
• Single wire – from 14 AWG to 22 AWG solid or
stranded
• Multiple wires – up to two 22 AWG stranded
For 24, 120, or 240 Vac power connections:
Single wire – from 14 to 18 AWG solid or stranded
Prepare wiring for the terminal blocks, as follows:
1. Strip 1/2 in. (13 mm) insulation from the conductor.
2. Cut a single wire to 3/16 in. (5 mm). Insert the wire
in the required terminal location and tighten the
screw.
3. If two or more wires are being inserted into one ter-
minal location, twist the wires together a minimum
of three turns before inserting them to ensure
proper electrical contact.
4. Cut the twisted end of the wires to 3/16 in. (5 mm)
before inserting them into the terminal and tighten-
ing the screw.
5. Pull on each wire in all terminals to check for good
mechanical connection.
Fig. 6. Attaching two or more wires at terminal blocks.
C
+
W
1
2
M24296
NO HIGH VOLTAGE. CLASS 2 WIRING ONLY.
EARTH GROUND TERMINAL MUST BE CONNECTED
TO CONDUIT CLAMP LOCALLY.
1
2
1/2 (13)
1. STRIP 1/2 IN. (13 MM)
FROM WIRES TO
BE ATTACHED AT
ONE TERMINAL.
2. TWIST WIRES
TOGETHER WITH
PLIERS (A MINIMUM
OF THREE TURNS).
3. CUT TWISTED END OF WIRES
TO 3/16 IN. (5 MM) BEFORE INSERTING
INTO TERMINAL AND TIGHTENING SCREW.
THEN PULL ON EACH WIRE IN ALL
TERMINALS TO CHECK FOR
GOOD MECHANICAL CONNECTION.
M24382

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
62-0257—11 6
Controller Wiring Details
The wiring connection terminals are shown in Fig. 7 and
are described in Table 2 on page 6.
See Fig. 8 – Fig. 12 beginning on page 7 for typical T775L
wiring applications.
Fig. 7. T775L Terminal and Feature Locations.
NOTE: Relays 5–8 are assigned to the first T775S
Expansion Module, if connected. Relays 9–12
are assigned to the second T775S, if connected.
WIRING APPLICATION
EXAMPLES
Fig. 8 – 12 beginning on page 6 illustrate typical controller
wiring for various applications.
NOTE: The electronic Series 90 output provided with
modulating T775 models can not drive electro-
mechanical slidewire devices like older Series 3
modulating meters (prior to Series 6), V9055s,
and S984s.
C
NO
NC
C
NO
NC
C
NC
NO
C
NC
NO
T
T
T
T
+
–
+
–
SENSOR A
SENSOR B
KNOCKOUT A
DIGITAL INPUT
POWER
120/240 VAC
OUTPUT
RELAY 2
KNOCKOUT D
POWER
24 VAC
OUTPUT
RELAY 1
KNOCKOUT C
KNOCKOUT E
SENSORS A AND B USE THE TWO TT CONNECTIONS AND ARE
POLARITY INSENSITIVE.
A SEPARATE EARTH GROUND IS REQUIRED FOR ANY POWER
SOURCE (24, 120, OR 240 VAC).
1
1
2
M24383
OUTPUT
RELAY 3
T775 BUS
OUTPUT
RELAY 4
2C+
KNOCKOUT B
120
COM
240
Table 2. Description of Wiring Terminal Connections.
Connection
Terminal
Label Description
Sensors
Sensor A T T Temperature Sensor; polarity
insensitive
Sensor B
Outputs
Relay 1
NO
COM
NC
120-240 Vac Relay Output
Relay 2
Relay 3
Relay 4
Input
DI + - Digital Input (dry contact)
Interconnect
T775 BUS + -Terminal Connection to/from
T775S
24 Vac Power
24V + + 24 Vac Hot
Common - 24 Vac Common
Ground Earth Grounda
aA separate earth ground is required for all installations
regardless of the power source (24, 120, or 240 Vac).
120 or 240 Vac Power
120 Vac 120 120 Vac Power
Common COM Common
240 Vac 240 240 Vac Power

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
7 62-0257—11
Fig. 8. Wiring for Two-stage Control – 24 Vac Input
and 24 Vac Load.
Fig. 9. Wiring for Four-stage Control – 24 Vac Input
and 24 Vac Load.
Fig. 10. Wiring for Two-stage Control with 120 or 240
Vac (120 Vac Input and 120 Vac Load shown).
Fig. 11. Wiring for Four-stage Control with 120 or 240
Vac (120 Vac Input and 120 Vac Load shown).
L1
(HOT)
L2
24 VAC
COM
NO
COM
NO
M24384A
LOAD 2
LOAD 1
SENSOR A
C
NO
NC
C
NO
NC
T
T
C+
L1
(HOT)
L2
24 VAC
M24385A
SENSOR A
C
NO
NC
C
NO
NC
C
NC
NO
C
NC
NO
T
T
COM
LOAD
4
NO
LOAD
3
LOAD
2
LOAD
1
C+
COM
NO
COM
NO
COM
NO
SENSOR A
C
NO
NC
C
NO
NC
T
T
COM
LOAD 2
LOAD 1
NO
COM
NO
COM
120V
M24386A
1
1FOR 240 VAC LOAD, CONNECT TO 240 TERMINAL.
C+
120
COM
240
SENSOR A
1FOR 240 VAC LOAD, CONNECT TO 240 TERMINAL.
SENSOR B
C
NO
NC
C
NO
NC
C
NC
NO
C
NC
NO
T
T
COM
120V 1
M24387A
LOAD 1
LOAD
3
LOAD
2
COM
NO
LOAD 4
T
T
C+
120
COM
240

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
62-0257—11 8
Fig. 12. Wiring for Digital Input (dry contact).
CHECKOUT
Inspect all wiring connections at the controller terminals,
and verify compliance with the installation wiring
diagrams.
WARNING
Electrical Shock Hazard.
Can cause severe injury, death or property
damage.
Disconnect power supply before beginning wiring
or making wiring connections, to prevent electrical
shock or equipment damage.
If any wiring changes are required, first be sure to remove
power from the controller before starting work. Pay
particular attention to verifying the power connection (24,
120, or 240 Vac).
After the controller is mounted and wired, apply power.
Power Loss
The date and time settings are retained for 24 hours after
a power outage. After a power loss of more than 24 hours,
the date and time settings may need to be reentered. All
other settings are stored permanently.
Temperature Sensor Calibration
As wire length increases, resistance increases and thus
the temperature reading increases. If necessary, calibrate
the sensor input by reducing the value by the amount
shown in the Table 3. For example, a wire run with 18
gauge wire of 1,000 feet, requires a calibration offset of
-6.0°F.
IMPORTANT
If the calibration value in the table exceeds the
controller’s calibration limits of +/-10°F (+/-6°C),
you must use a heavier gauge wire.
For example, with a wire run of 1,000 feet you
must use 20 AWG wire or heavier in order to
calibrate for wire loss within the limits of the
controller.
See “1.1.1.2. CALIBRATE (the sensor)” on page 13 for
the instructions to enter the calibration value.
See Table 3 and Fig. 13 on page 8 for temperature
resistance information.
Fig. 13 shows how sensor resistance varies with
temperature for a sensor having a positive temperature
coefficient (PTC) of 2.1 Ohms per degree F (3.85 Ohms
per degree C).
Fig. 13. Sensor Resistance vs. Temperature.
M24391
DIGITAL
INPUT
+
–
Table 3. Temperature Sensor Calibration for
Resistance Loss due to Wire Length.
AWG
Rating mΩ/ft
Temperature Offset in
°F (Foot)a
aThis is the distance from the controller to the sensor
(already accounts for round trip distance).
200 ft 500 ft 1,000 ft
14 2.5 0.46 1.14 2.28
16 4.0 0.72 1.82 3.64
18 6.4 1.16 2.90 5.82
20 10.2 1.86 4.64 9.28
22 16.1 2.92 7.32 14.64
AWG
Rating mΩ/m
Temperature Offset in
°C (Meter)a
100 m 200 m 300 m
14 8.3 0.44 0.86 1.30
16 13.2 0.68 1.38 2.06
18 21.0 1.10 2.18 3.28
20 33.5 1.74 3.48 5.22
22 52.8 2.74 5.48 8.22
M24304
TEMPERATURE (DEGREES)
RESISTANCE (OHMS)
1403
1317
1231
1145
1059
973
20 40 60 80 100 120 140 160 180 200 220
0 10 20 30 40 50 60 70 80 90 100
°F
°C
0-20-40
120
110
250
-40 -20 -10-30
1489
887
801
1097 ± 0.08 OHMS
AT 77°F (25°C)
POSITIVE TEMPERATURE COEFFICIENT (PTC) OF 2.1 OHMS PER °F
1
1

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
9 62-0257—11
INTERFACE OVERVIEW
The T775L controller uses an LCD panel and 6-button
keypad to provide status information and permit user input
of the programming, setup, and scheduling parameters.
The following figure describes the display areas of the
LCD and the keypad.
Fig. 14. LCD Display - Home Screen And Keypad.
Menu Area – On the home screen, the LCD displays the
configured relays and whether they are active. In
Program, Setup, or Schedule mode, the LCD displays the
current menu selection and its order within the menu
hierarchy.
Data Area – On the home screen, the LCD displays the
sensors and outputs status. In Setup or Program mode,
the LCD displays menu choices, parameter selections,
and data values.
Lock Icon – The icon indicates the MENU button is
locked and prevents access to the Setup and Program
menus.
NOTE: Pressing and holding the HOME and MENU 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”).
Using the LCD Panel Interface
The 6-button keypad is used to move through the menus
and enter or change parameter values.
Home Button
Pressing the HOME button at any time exits the current
Programming or Setup display screen and returns to the
home screen as shown in Fig. 14 and Fig. 15.
Menu Button
• Pressing the MENU button always displays the
Program menu. If you are in Setup mode, you exit
setup and return to the Program menu.
• Pressing and holding the MENU button for five
seconds leaves the current screen and displays
the Setup menu.
Left and Right Arrow Buttons (and )
Use these buttons to move backward () and forward ()
through the Program and Setup menus.
Up and Down Arrow Buttons (and )
Use these buttons to move your selection up and down
through a menu or list.
• When the desired item is highlighted, you press the 
arrow button to display that item’s content.
• When a value is displayed (e.g. 70°F), the up and
down arrows increase and decrease the value.
NOTE: Once you select an item from a list or enter a
value, pressing the or or HOME button
accepts your selection or value and stores it in
the controller’s memory.
Home Screen
In the normal run state, the LCD home screen displays
the current sensed temperatures, the active status of the
output loops and relays, and error and status codes.
When using Reset, the Heat/Cool setpoint(s) display on
the home screen for the Loop and Relay outputs; see Fig.
15.
Active relays are indicated by the small black square ()
just below the relay number. Fig. 15 shows the home
screen with relays 1, 2, and 4–6 energized.
Pressing the and buttons from the home screen
cycles through the sensors, loops, and additional relay(s).
Fig. 15. LCD Display - Home Screen Displaying
Sensors, Loops, and additional Relay(s).
NOTES:
1. The loop home screen and the relay home
screen do not dynamically update the active
relay status and sensor values. The informa-
tion is a snapshot taken when you press the
or button to display the screen.
2. In Reset mode, the home screen displays the
effective setpoint.
IMPORTANT
After four minutes of inactivity (no buttons
pressed), the LCD display reverts to the home
screen display.
DI ON
HOME
1234567891011 12
SENSORS
SENSOR A
78
SENSOR B
84
MENU AREA
home menu
F
o
F
o
DATA AREA
LOCK ICON
M24397
6 BUTTON KEYPAD
DI ON
HOME
12345678910 11 12
SENSORS
SENSOR A
78
SENSOR B
84
o
o
F
F
DI ON
HOME
oF
oF
L1 1-4 ON
HEAT
SETPOINT
60
SENSOR A
78
RT 1436 HRS
12345678910 11 12
DI ON
HOME
oF
oF
REL 9 OFF
HEAT
SETPOINT
60
SENSOR A
78
RT 684 HRS
12345678910 11 12
M24398

T775L SERIES 2000 ELECTRONIC STAND-ALONE STAGING CONTROLLER
62-0257—11 10
Accessing the Menus
Menus are used for setup, programming, scheduling, and
viewing the summary settings.
Program, Schedule, and Summary
Menus
To access these menus from the home screen, press the
MENU button. See Fig. 16.
Fig. 16. Menus.
Depending on whether scheduling is enabled or not, the
LCD displays one of two menus as shown in Fig. 16.
Scheduling is enabled from the Setup menu’s Output
settings (see “1.3.3.1. USE SCHED” on page 15).
Setup Menu
To access the Setup menu, press and hold the MENU
button for five seconds. See Fig. 17.
Fig. 17. Setup Menu.
Using the Menus
When you are working with the menus, use the:
• Left arrow button () to scroll backward through the
menus
• Right arrow button ()to select the highlighted menu
item and display its content
• Up and Down arrow buttons (and ) to scroll up
and down through a list of items or to increase or
decrease the value of a displayed parameter
NOTES:
1. If you press the HOME button or there is no keypad
activity for four minutes, you exit Program mode and
return to the home screen.
2. If you press the MENU button, you exit and return to
the menu.
PROGRAMMING OVERVIEW
The controller must be programmed before being placed
into service.
IMPORTANT
During programming, the controller is live at all
times. For example, the contacts may open and
close when adjusting the setpoint.
The programming process uses a hierarchical menu
structure that is easy to use. You press the
 and  arrow
buttons to move forward and backward through the menus.
NOTES:
1. The T775L controller interface is intuitive. You may
want to use this procedure simply as a reference to
locate the particular option or parameter of interest.
2. The menus can display only those relays that are
defined in Setup (see “1.3.1. Number of RELAYS” on
page 14). For example, if you configure only one
relay, then only one relay displays on the appropriate
menus.
3. If you press the HOME button or there is no keypad
activity for four minutes, you exit Program mode and
return to the home screen.
4. If you press the MENU button, you exit Program
mode and return to the menu.
Control Loops
The T775L provides the capability to have up to two PID
control loops, which allow multiple stages to be assigned
to a single setpoint in each loop.
Setpoint and Differential
The following describes the relationship between setpoint
and differential for heating and cooling. These settings are
programmed for each output relay.
Heating Mode Setpoint and Differential
In heating mode, the differential is below the setpoint. The
relay de-energizes when the temperature rises to the
setpoint. As the temperature drops to the setpoint minus
the differential, the relay energizes.
Cooling Mode Setpoint and Differential
In cooling mode, the differential is above the setpoint. The
relay de-energizes when the temperature falls to the
setpoint. As the temperature rises to the setpoint plus the
differential, the relay energizes.
MENU
PROGRAM
EXIT
home menu OR
MENU DISPLAY WHEN
SCHEDULING IS NOT SET
MENU DISPLAY WHEN
SCHEDULING IS SET
MENU
DI ON
HOME
F
o
F
o
SENSORS
SENSOR A
78
SENSOR B
84
PROGRAM
SCHEDULE
SUMMARY
EXIT
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M24399
home menu
SETUP
DI ON
HOME
FIVE
SECONDS
F
o
F
o
SENSORS
SENSOR A
78
SENSOR B
84
SENSORS
OUTPUTS
EXIT
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M24400A