Tantalus ST-1480 Smart Thermostat
Operating and
Installation Manual
© All Rights Reserved
Operating and
Installation Manual
Congratulations on the purchase of your new thermostat. It has been designed for easy
programming to save you on energy costs and allow a comfortable living environment.
Features:
• Auto Mode programming of your yearly Heating and Cooling needs
• Easy adjustment of temperature and schedule
• EnergyStar® compliant presets to help reduce heating and cooling costs
• Wirelessly communicates with your utility
• Notifies you and automatically responds to utility demand response programs
• Single button Conserve Mode operation
• Large, easy to read backlit display
• Silent operation
• Protection against installation short circuits
Table of Contents
OPERATING THE THERMOSTAT...........................................................................7
WORKING MODES..............................................................................................................7
NORMAL OPERATING MODE............................................................................................8
NAVIGATING THE CONTROLS ..........................................................................................8
HOME SCREEN...................................................................................................................9
TITLE BAR.........................................................................................................................10
HELP BUTTON..................................................................................................................10
SETTING THE TIME ..........................................................................................................11
DEFAULT SCHEDULE......................................................................................................12
TEMPORARY HOLD..........................................................................................................13
HEATING AND COOLING MODES ...................................................................................14
FAN MODES ......................................................................................................................15
TEMPERATURE SETTINGS .............................................................................................16
SCHEDULE........................................................................................................................18
PERMANENT, TIMED, AND VACATION HOLDS..............................................................19
TEMPERATURE UNITS AND CALIBRATION ...................................................................21
SERVICE INFORMATION.................................................................................................22
USER OPTIONS ................................................................................................................23
LANGUAGES .................................................................................................................23
SCHEDULE....................................................................................................................23
CHANGE FILTER REMIND ER.......................................................................................24
POWER OUTAGES ...........................................................................................................24
THERMOSTAT CONSERVATION MODE.........................................................................25
USER CONSERVE MODE.............................................................................................26
UTILITY CONSERVE MODE .........................................................................................28
INSTALLATION AND MAINTENANCE..................................................................30
MOUNTING THE THERMOSTAT ......................................................................................30
MOUNTING THE REMOTE SENSORS .............................................................................30
CLEANING THE THERMOSTAT.......................................................................................30
REMOVING THERMOSTAT FRONT HOUSING FROM BACKPLATE..............................31
REPLACING THE BATTERY..........................................................................................31
WIRING CONFIGURATION...............................................................................................32
SETUP MENU OPTIONS...................................................................................................34
PASSWORD...................................................................................................................34
SETPOINT RANGE........................................................................................................35
EQUIPMENT TYPE ........................................................................................................35
EQUIPMENT SETTINGS...................................................................................................36
CONVENTIONAL SYSTEMS .........................................................................................36
HEAT PUMP SYSTEMS.................................................................................................37
CONTROL OPTIONS.........................................................................................................38
RESET...............................................................................................................................39
CONVENTIONAL SYSTEM TEST .....................................................................................40
HEAT-PUMP SYSTEM TEST............................................................................................41
PRODUCT CONFORMITY.................................................................................................42
NOTES...............................................................................................................................43
OPERATING THE THERMOSTAT
Working Modes
The thermostat has two working modes:
• Normal Operating Mode: In this mode you can program the SETPOINT temperatures,
the schedules and remaining parameters of the thermostat configuration.
• Conservation Mode: When set in this mode by either you or through a remote request
from your utility, the scheduled SETPOINT values are modified to save energy; you
cannot modify any settings that may affect the objective temperatures or the HVAC
equipment operation.
NORMAL OPERATING MODE
Navigating the Controls
The function of the LEFT and RIGHT TAB buttons appears on the bottom of the display screen.
Use the SCROLL (? ?) buttons to move through the menu items and options, and to change
highlighted values. Press the SELECT (v) button to select or accept highlighted menu items. You
can always go back or cancel prior to saving changes.
Home Screen
The Home Screen displays current temperature and operation data. To view this screen when the
backlight is off just press any of the buttons. Icons such as the heat or fan are animated when the
equipment is running.
Title Bar
The current time is displayed in the upper right corner of the Title Bar while in the upper left corner
there is an icon showing the communications link status between the thermostat and the utility
meter:
means Link OFF, means Link ON,
The Title Bar also displays messages sent through the communications link to you by your utility
(e.g., the Electricity Rate).
HELP button
The HELP button provides you with information on how to navigate through the individual menu
screens. It will help you quickly change settings without referring to this user manual; howeve r, it
does not replace it so please keep this manual for future reference.
? ?
Setting the Time
The current date and time need to be set at initial installation and after battery replacement. You
can change the day, time, enable a 24h clock readout, and change from daylight saving to standard
time by selecting TIME from the Main Menu. You can always change between 12H or 24H clock
format.
Press the Left Tab button on the home screen to view the Main
Menu
Use the SCROLL buttons to select the TIME menu.
Press SELECT to enter the TIME menu.
Use the SCROLL buttons to select between the ADJUST
DATE/TIME and the CLOCK FORMAT menus.
To change between 12 and 24 hour clock formats, press SELECT
on the CLOCK FORMAT menu item. The setting will be
underlined. You can change it using the SCROLL buttons and
then pressing SELECT.
To adjust the date and time, press SELECT on the ADJUST
DAY/TIME menu item.
The underlined selection will be changed using the SCROLL
buttons.
Press SELECT to move between hour and minute adjustment.
Press SAVE CHANGES to accept the new settings and return to
the TIME menu.
Default Schedule
The thermostat’s Schedule is factory programmed in accordance with EnergyStar guidelines which
define the START TIMES and SETPOINTS listed below (Note that a SETPOINT is defined by a
NAME, and HEAT & COOL temperatures). The thermostat anticipates the time required to reach a
desired temperature prior to the start of the SETPOINT time; therefore, you only need to set the
desired time for the SETPOINT temperature.
SCHEDULE
Mon. to Fri. Sat. & Sun.
SETPOINT SETPOINT
START
TIMES
NAME HEAT COOL
START
TIMES
NAME HEAT COOL
6:00 am Wake 70°F (21°C) 78°F (26°C)
8:00 am Leave 62°F (17°C) 85°F (29°C)
8:00 am Wake 70°F (21°C) 78°F (26°C)
6:00 pm Return 70°F (21°C) 78°F (26°C)
10:00 pm Sleep 62°F (17°C) 82°F (28°C)
11:00 pm Sleep 62°F (17°C) 82°F (28°C)
Temporary HOLD
You temporarily adjust the temperature warmer or cooler, without affecting the pre-set
programming, through the use of a temporary hold. The thermostat will remain at the temporary
HOLD temperature until the next scheduled SETPOINT.
From the home screen, press either of the SCROLL buttons to
view this screen. Continue to press either of the SCROLL buttons
to highlight the operating target SETPOINT (HEAT or COOL),
which will be underlined.
Press the SELECT button to toggle between the HEAT and COOL
temperatures.
Set the desired temperature using the SCROLL buttons.
Press the LEFT TAB to ENGAGE HOLD, or RIGHT TAB to
CANCEL and return to the normal Home Screen.
When TEMPORARY HOLD is engaged the screen will be as shown below:
To cancel a HOLD, press a SCROLL button to return to this
screen.
Press the RIGHT TAB to CANCEL HOLD, or LEFT TAB to
ENGAGE HOLD (continue the HOLD) and return to the normal
Home Screen.
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