TXU Energy iThermostat User manual

TXU Energy
iThermostatTM
User Manual

2 iThermostat™User Manual
Copyright May 2008
Data, drawings, and other material contained herein are proprietary to TXU Energy Retail Company, LLC and may not be reproduced
or duplicated in any form without the prior permission of TXU Energy.
iThermostat is a trademark of TXU Energy Retail Company, LLC.
iThermostat is manufactured in partnership with Comverge and White-Rodgers.
Portions © 2008 TXU Energy Retail Company, LLC. All rights reserved. REP Certificate Number 10004.

Contents
Getting Started with Your iThermostat™..........................................................2
Overview.....................................................................................................................................2
iThermostat Buttons ...................................................................................................................3
iThermostat Display ....................................................................................................................4
Selecting Heating or Cooling .......................................................................................................5
Setting the Current Day and Time ...............................................................................................7
Replacing the Batteries in Your iThermostat .............................................................................10
Resetting the FLTR Display .......................................................................................................12
Programming Your iThermostat .......................................................................13
Planning Your Program..............................................................................................................14
Programming Heating and Cooling............................................................................................15
Setting Holds ............................................................................................................................19
Setting Temporary Holds...........................................................................................................19
Setting Permanent Holds ..........................................................................................................21
Setting Timed Holds..................................................................................................................22
Clearing Holds...........................................................................................................................23
Troubleshooting Assistance Guide ..................................................................24

2 iThermostat™User Manual
Getting Started with Your iThermostat™
Overview
Your iThermostat consists of two main parts: the base and the cover (lower portion of iThermostat front as shown below).
You open the cover to access the buttons to operate and program the iThermostat.
Open the iThermostat cover:
•Pull the cover straight out from the base.
Close the iThermostat cover:
•Push the cover up until it lines up with the base. Press gently until the
cover snaps into place.
Base
Cover

iThermostat™User Manual 3
iThermostat Buttons
RUN
•Cancels holds and returns
system to programmed
settings.
•Exits programming and
saves all settings.
HOLD
Holds system at current
temperature setting
until you release by
pressing RUN.
TIME
•Sets current time.
•In programming mode, toggles
between the period start time
and temperature setpoint you
want to program.
PRGM
Allows you to program
your iThermostat
SYSTEM
Selects which system you want to
operate: cooling, heating, auto-
changeover, emergency heat
(applies to heat pumps only), or
OFF.
FAN
Controls your system’s indoor
fan. For energy efficiency, this
is normally set to AUTO but
can be set to ON.
FLTR
Pressing RUN and HOLD
together resets the
FLTR display on your
iThermostat.

iThermostat™User Manual 4
iThermostat™Display
Period of the Day
Indicates the current period of the day
in programming mode.
Day of the week
Indicates the current day of the week.
HOLD
Indicates a permanent system
temperature hold.
Temperature Setpoint
Displays the current temperature
setpoint.
System indicator
Indicates the current system status:
•COOL – Air conditioning
•HEAT – Heat
•HEAT/COOL – Auto-changeover
•EMER – Emergency heat (heat pump only)
•AUX – Auxiliary heat (heat pump only)
•STG 1 – Low speed of 2-stage compressor
•STG 1+2
–
Hi
g
h s
p
eed of 2-sta
g
e com
p
ressor
Time / Current Temperature
Display alternates between the current
time and the current room
temperature.

iThermostat™User Manual 5
Selecting Heating or Cooling
Use the SYSTEM button to select your iThermostat system mode. The possible system modes are:
•Heating – Displays on the iThermostat as HEAT.
•Cooling – Displays on the iThermostat as COOL.
•Auto-changeover (see below) – Both HEAT and COOL icons are on.
•Emergency heat – Displays EMER (flashing) and HEAT.
•Off – Displays on the iThermostat as OFF.
When heating or cooling is called, STG 1 or STG 1+2 will display (depending on how many speeds your heating/cooling
system is capable of using).
Auto-Changeover Mode
When the iThermostat is in auto-changeover mode, it automatically switches between your heating and cooling
programmed schedules to maintain your home temperature within your heating and cooling programs. The iThermostat
will call for heat or cool as needed, but never both at the same time. Auto-changeover is convenient during the fall and
spring when days may be cool in the early morning hours and hot in the afternoons.
Important:
•In auto-changeover mode, the programmed heat setpoint must be 2 degrees lower than the cool setpoint.
•Keep the windows in your home closed when auto-changeover mode is in effect, to avoid wasting heating or cooling
energy.

Selecting Heating or Cooling
6 iThermostat™User Manual
Quick Guide Description IThermostat Display
Press one or more
times to select the
desired mode.
Press the SYSTEM button one or more times to select the desired
mode.
•When heating is selected, HEAT is displayed.
•When cooling is selected, COOL is displayed.
•When auto-changeover mode is selected, both HEAT and
COOL icons are on.
•When emergency heat is selected (heat pump systems only),
EMER HEAT is displayed (EMER flashes).
•When the system is Off, OFF displays to the left.
When heating or cooling is called (compressor turned On), STG 1
or STG 1+2 will display (depending on how many speeds your
heating/cooling system is capable of using).
Cooling On:
System Off:

iThermostat™User Manual 7
Setting the Current Day and Time
Typically the current day and time on your iThermostat will be set automatically by the system. In case the system does
not set the day and time, you may need to set it yourself manually.
Quick Guide Step Description iThermostat Display
Press once. 1 Press the TIME button. The display shows the hour and AM
or PM.
Press to select the
hour. 2
Press and hold the up arrow or down arrow button until
you reach the correct hour and AM or PM.
Note: AM begins at midnight and PM begins at noon.

Setting the Current Day and Time
8 iThermostat™User Manual
Quick Guide Step Description iThermostat Display
Press again. 3 Press TIME again. The display shows minutes only.
Press to select the
minute. 4 Press and hold the up arrow or down arrow button until
you reach the correct minute.
Press again. 5 Press TIME again. The display shows the day of week.

Setting the Current Day and Time
iThermostat™User Manual 9
Quick Guide Step Description iThermostat Display
Press to select the
day of week. 6 Press and hold the up arrow or down arrow button until
you reach the current day of the week.
Press once. 7 Press RUN. The iThermostat returns to normal display.

iThermostat™User Manual 10
Replacing the Batteries in Your iThermostat™
If BATT appears on your iThermostat display, the batteries are low and need to be replaced.
Batteries are not required to keep your programming or menu data. However, with batteries installed, your iThermostat
will maintain the time and continuously display the temperature during a loss of AC power.
Required Battery Type
AA alkaline batteries Install batteries here.

Replacing the Batteries in Your iThermostat™
iThermostat™User Manual 11
Quick Guide Step Description iThermostat Display
Press until OFF is
displayed. 1 Turn the system off by pressing the SYSTEM button
one or more times until OFF is displayed in the area
where the time is normally displayed.
Remove cover. 2
Gently pull the cover straight off the base.
Note: Forcing or prying on the iThermostat can cause
damage to the unit.
Install batteries. 3 Remove old batteries. Install fresh AA alkaline
batteries along the top of the base with the positive (+)
end to the left (see diagram on page 10).
Press to select the
desired mode. 4 Turn the system back on by pressing the SYSTEM
button one or more times until the desired mode
(COOL, HEAT, or AUTO) is displayed.

iThermostat™User Manual 12
Resetting the FLTR Display
If FLTR appears in your iThermostat display, this is a reminder that you need to change or clean the filter in your HVAC
system. After you change or clean the filter, you can reset the display so FLTR no longer appears.
Quick Guide Description iThermostat Display
Press both
buttons at the
same time.
Press the RUN and HOLD buttons at the same time.
The FLTR display no longer appears on the iThermostat.

iThermostat™User Manual 13
Programming Your iThermostat™
This chapter explains how to program your iThermostat, including programming heating and cooling, and setting and
clearing holds.
Your iThermostat offers the following options for flexible programming:
•Separate programs for heating and cooling.
•Separate programs for weekdays, Saturday, and Sunday.
•Four time periods per day – Morning, Day, Evening, and Night. You can specify start times and temperatures for each
time period.
Conserve Energy While Maximizing Comfort
The iThermostat’s programming options help you maximize comfort during the times when you are typically at home.
You can also conserve energy during the times when you are typically away from home or sleeping by allowing the
temperature in your home to increase (summer) or decrease (winter).

iThermostat™User Manual 14
Planning Your Program
Before you begin programming your iThermostat, you can use the chart below to help you plan your program.
Weekdays
(MO TU WE TH FR)
Saturday
(SA)
Sunday
(SU)
Period
Start Time Temp Start Time Temp Start Time Temp
MOR
DAY
EVE
HEAT
NGT
MOR
DAY
EVE
COOL
NGT

iThermostat™User Manual 15
Programming Heating and Cooling
Quick Guide Step Description iThermostat Display
Press one or
more times to
select HEAT or
COOL.
1 Be sure your screen shows the normal display.
Press the SYSTEM button one or more times to select the
desired mode: HEAT or COOL.
Press once. 2
Press PRGM once. “MO TU WE TH FR” (indicating
weekday program) appears in the display, with the
currently programmed start time for the first
heating/cooling period (MOR) and the currently
programmed temperature flashing.
Temperature will flash:
Press to select
desired
temperature. 3 Press the up or down arrow button to change the
temperature to the desired setting for the first time period
of the day (MOR).
Temperature will flash:

Programming Heating and Cooling
16 iThermostat™User Manual
Quick Guide Step Description iThermostat Display
Press once.
Press to set time
at which MOR
period begins.
4
Press TIME once until time flashes in the display.
Use the arrow buttons to set the time at which you want the
MOR period to begin. The arrow buttons change the time
in 15 minute intervals.
Time will flash:
Press once. 5 Press PRGM once. The current start time and temperature
for the second heating/cooling program period (DAY)
appears in the display.
Temperature will flash:
Repeat Steps 3
and 4. 6 Repeat Steps 3 and 4 to select the start time and
temperature for the DAY period.

Programming Heating and Cooling
iThermostat™User Manual 17
Quick Guide Step Description iThermostat Display
Repeat Steps 3
through 5. 7 Repeat Steps 3 through 5 for the third (EVE) and fourth
(NHT) time periods of the day.
Press once. 8 Press PRGM once. SA (indicating the Saturday program)
will appear in the display, along with the start time for the
MOR period and the currently programmed temperature.
Repeat Steps 3
through 7. 9 Repeat Steps 3 through 7 to complete Saturday
heating/cooling programming.
Press once. 10 Press PRGM once to change to SU (Sunday)
heating/cooling programming.

Programming Heating and Cooling
18 iThermostat™User Manual
Quick Guide Step Description iThermostat Display
Repeat Steps 3
through 7. 11 Repeat Steps 3 through 7 to complete Sunday
heating/cooling programming.
Press once. 12 Press the RUN button once to save and exit programming.