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INTERFACE OVERVIEW
INTERFACE OVERVIEW
The T775A/B/M controllers use an LCD panel and
6-button keypad to provide status information and permit
user input of the programming, setup, and scheduling
parameters.
The following figure describes the display areas of the
LCD and the keypad.
HOME
RELAYS 1 2 3 4
ON
SENSORS
SENSOR A
78
o
F
SENSOR B
84
o
F
MOD1
40%
MOD2
60%
DI ON
home
menu
Fig. 22. 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. 22 and Fig. 23.
Menu Button
• Pressing the MENU button always displays the
• Pressing and holding the MENU button for five
Left and Right Arrow Buttons (
Use these buttons to move backward ( ) and forward ( )
through the Program and Setup menus.
Up and Down Arrow Buttons (
MENU AREA
Use these buttons to move your selection up and down
through a menu or list.
• When the desired item is highlighted, you press the
• When a value is displayed (e.g. 70°F), the up and
DATA AREA
NOTE: Once you select an item from a list or enter a
LOCK ICON
Home Screen
In the normal run state, the LCD home screen displays
the current sensed temperatures, the modulating outputs
status, the active status of the output relays, and error and
6 BUTTON KEYPAD
status codes.
Active relays are indicated by the small black square ( )
M24488
just below the relay number. Fig. 23 shows the home
screen with relays 1, 2, and 4 energized.
Pressing the
cycles through each modulating output that is paired with
the sensor it controls and the active output relays.
RELAYS 1 2 3 4
SENSOR A
SENSOR B
MOD1
MOD2
DI ON
NOTE: The modulating output home screen and the
IMPORTANT
11
T775A/B/M SERIES 2000 CONTROLLER
Program menu. If you are in Setup mode, you exit
setup and return to the Program menu.
seconds leaves the current screen and displays
the Setup menu.
arrow button to display that item's content.
down arrows increase and decrease the value.
value, pressing the
or
accepts your selection or value and stores it in
the controller's memory.
and
buttons from the home screen
HOME
HOME
RELAYS 1 2 3 4
ON
ON
SENSORS
MOD 1
COOL
78
o
F
SETPOINT
74
84
o
F
SENSOR A
62
40%
MOD1
40%
MOD2
60%
60%
DI ON
Fig. 23. LCD Display - Home Screen Displaying
Sensors, Active Relays, and Mod Outputs.
relay home screen do not dynamically update
the active relay status, sensor values, and
modulating output percentages. The information
is a snapshot taken when you press the
button to display the screen.
After four minutes of inactivity (no buttons
pressed), the LCD display reverts to the home
screen display.
)
and
)
and
or HOME button
HOME
RELAYS 1 2 3 4
ON
40%
REL 1
ON
HEAT
SETPOINT
60
o
o
F
F
SENSOR A
62
o
F
o
F
RT 12345 HRS
MOD1
40%
MOD2
60%
DI ON
M24489
or
62-0254–03
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Troubleshooting
