residential
THERMOSTAT
Digital
Digital
Thermostat
Thermostat
5+2 Day
5+2 Day
PROGRAMMABLE
PROGRAMMABLE
up to
up to
& 2-cool
& 2-cool
HEAT
COOL
Back-Lit display
One For All Works with
Virtually All Equipment
5 minute Built-In
Compressor Protection
Control up to 2 heat & 2 Cool Stages
4 Settings Per Day
Self-prompting programming
Auto changeover
Separate weekday, Saturday
& Sunday programming
Use with most Air Conditioning & Heating Systems including: 1 or 2 Stage
Electric Cooling & 2 Stage Gas Heating, Heat Pump, Electric or Hydronic Heat.
Non-Volatile memory
Dual setpoint with
adjustable deadband
Keypad lockout
‘O’ or ‘B’ Terminal
Display either F or C
T1050
2-heat
2-heat
HEAT
PUMP
OWNER’S
OWNER’S
MANUAL
MANUAL
Venstar Inc. 08/07
Table Of Contents
FRONT PANEL
DISPLAY
QUICK START Set the clock and go
SELECTING THE HEAT
OR COOL MODE
BASIC OPERATION
PROGRAMMING A DAILY
SCHEDULE
ADVANCED SETUP
ABOUT ADVANCED FEATURES
& OPERATION
WARRANTY
CAUTION
Follow Installation Instructions carefully.
DISCONNECT POWER TO THE HEATER AIR CONDITIONER BEFORE REMOVING
THE OLD THERMOSTAT AND INSTALLING
THE NEW THERMOSTAT.
Venstar Inc. 08/07
2
3
5
6
7
8
11
15
19
WARNING
P/N T1050
Page 1
Front Panel
I2:00
Mo
Am
74
COOL
AUTO
72
HEAT
70
Liquid Crystal Display
with Thermoglow
Up/Down Buttons
Mode Button
Fan Button
Heat or Cool Indicator
Red = Heat, Green = Cool
Page 2
Display
Am
Night
I8:88
SuMoTuWeThFrSa
Pm
Setup
88
o
COOL
AUTO
Locked
ONOFF
Program
Morning
Fan On
Mode Indicators - Page 6
Selects the operational mode of the equipment.
HEAT - Indicates the heating mode.
COOL - Indicates the air conditioning mode.
AUTO - Indicates the system will automatically
changeover between heat and cool modes
as the temperature varies.
PROGRAM ON - Indicates the time period
program is enabled to run.
OFF - Indicates heating and cooling are turned off.
Clock with Day of the Week - Page 5
Indicates the current time and day. This clock is
also used to program the time period schedules.
Day
Evening
On
HEAT
88
Room Temperature Display
Indicates current room temperature.
Desired Set Temperature - Page 7
Indicates desired room temperature(s).
Page 3
Display
Am
Night
I8:88
SuMoTuWeThFrSa
Pm
Setup
88
o
COOL
AUTO
Locked
ONOFF
Program
Morning
Fan On
Morning, Day, Evening & Night icons - Pages 8-10
Indicates the day part of the time period program.
Setup icon - Pages 11-13
Indicates the thermostat is in the setup mode.
Fan On icon - Page 7
Indicates constant, continuous fan operation.
When Fan On is not lit - indicates the fan will only
operate when necessary to heat or to cool.
Day
Evening
On
HEAT
88
Locked icon - Page 18
Indicates the keypad has been locked.
Page 4
Quick Start Set the Clock and Go
MODE FAN
Setting the Clock
Tip: To change hours quickly,
press and hold the FAN
button and press the UP or
DOWN buttons.
Setting the Day
Press the MODE and FAN
buttons at the same time
for two seconds to enter
Setup screens.
Am
I2:00
Setup
SetupMo
During Setup & Programming:
Pressing the UP or DOWN
bu ttons wil l mo dify th e
flashing selection.
To adjust the
Clock or Day use
Press
MODE
buttons.
Press the MODE
and FAN buttons
MODE FAN
at the same time
t o r e t u r n t o
normal operation.
The thermostat is preprogrammed from the factory to operate
one or two stage equipment* without the need for further
programming. To optimize the installation of this thermostat,
follow the instructions in the Advanced Setup section.
* The thermostat is not preprogrammed from the factory to operate
electric heat or heat pump systems. To control these systems,
follow the steps in the Advanced Setup section, pages 11 & 12.
Page 5
Selecting the Heat or Cool Mode
Select Mode by Pressing the MODE Button
Pm
I2:00
Heating Only
The HEAT setting indicates the
temperature the room has to
reach before the furnace will
turn on to heat the room.
Cooling Only
The COOL setting indicates the
temperature the room has to
reach before the air conditioner
will turn on to cool the room.
Heating or Cooling
AUTO will automatically select
heat or cool based on room
temperature demand.
Time Schedule for
Heating or Cooling
The Program On setting will
activate the time period
programming for the cooling
or heating setpoint ONLY
(Morning, Day, Evening
& Night Periods).
OFF indicates both heating
and air conditioning
systems are turned off.
Off
Mo
70
Pm
I2:00
Mo
70
Pm
I2:00
Mo
70
Pm
I2:00
Mo
70
Day
Pm
I2:00
Mo
70
HEAT
68
76
COOL
76
COOL
AUTO
HEAT
68
76
COOL
Program
HEAT
68
Press
MODE
Press
MODE
Press
MODE
On
Press
MODE
OFF
Page 6
Basic Operation
Selecting Your Desired Temperature
(adjusting the setpoints)
AUTO OR PROGRAM MODE
Pressing the UP or DOWN buttons in Auto or Program mode will
adjust both the heat and cool set temperatures simultaneously.
I2:00
Mo
Pm
76
COOL
AUTO
Adjust the desired
set temperature with the
70
HEAT OR COOL MODE
Pressing the UP or DOWN buttons in Heat or Cool mode will
adjust only the heat or cool set temperature.
Pm
I2:00
Mo
HEAT
68
76
COOL
buttons.
Adjust the desired
set temperature with the
70
buttons.
Using the Fan Button
Pm
I2:00
Mo
76
COOL
70
Fan On
Press
FAN
Fan On indicates constant fan
operation. You may turn the fan
on even if the thermostat is in the
Off mode. Pressing the FAN button
toggles this feature on or off.
Page 7
Programming a Daily Schedule
MODE
Select day of the week.
MoTuWeThFr = Weekday
schedule
SaSu = Weekend schedule
Adjust the start time
for Morning.
Adjust the cooling
setpoint for Morning.
(35 - 99 )
Adjust the heating
setpoint for Morning.
(35 - 99 )
Press the MODE button. While holding MODE,
press the UP button for two seconds to enter
time period programming.
MoTuWeThFr
MODE
Am
6:00
MoTuWeThFr
Morning
MODE
Am
6:00
MoTuWeThFr
Morning
6:00
MoTuWeThFr
Morning
78
COOL
MODE
Am
78
COOL
HEAT
70
MODE
Press
Press
Press
Press
Page 8
Continued
Programming a Daily Schedule
8:00
MoTuWeThFr
Adjust the start time
for Day.
8:00
MoTuWeThFr
Adjust the cooling
setpoint for Day.
(35 - 99 )
8:00
MoTuWeThFr
Adjust the heating
setpoint for Day.
(35 - 99 )
6:00
MoTuWeThFr
Adjust the start time
for Evening.
6:00
Adjust the cooling
MoTuWeThFr
setpoint for Evening.
(35 - 99 )
Page 9
Am
Day
Am
Day
Am
Day
Pm
Evening
Pm
Evening
85
COOL
85
COOL
HEAT
62
78
COOL
Continued
Press
MODE
Press
MODE
Press
MODE
Press
MODE
Press
MODE
Programming a Daily Schedule
6:00
Adjust the heating
setpoint for Evening.
(35 - 99 )
Adjust the start time
for Night.
Adjust the cooling
setpoint for Night.
(35 - 99 )
Adjust the heating
setpoint for Night.
(35 - 99 )
MoTuWeThFr
I0:00
MoTuWeThFr
I0:00
MoTuWeThFr
I0:00
MoTuWeThFr
Pm
Evening
Pm
Pm
Pm
Night
Night
Night
78
COOL
HEAT
70
82
COOL
82
COOL
HEAT
62
Press
MODE
Press
MODE
Press
MODE
Press
MODE
To continue Time Period
Progr am mi ng for the
weekend schedule, refer
to the steps on page 8.
Page 10
Su Sa
Press
MODE
To Page 8
Advanced Setup
MODE FAN
Adjust the time of day
clock.
Tip: To change hours quickly, press and
hold the FAN button in and press
the UP or DOWN buttons.
Select the day of the
week.
On
ON = Heat Pump
operation
OFF = Gas Electric
operation
Off
Pr e s s t h e M O D E
button. While holding
MODE, press the FAN
button for 10 seconds
to enter setup screens.
Am
I2:00
Setup
Setup Mo
Setup
Hp
NOTE: Each step # is located at
the top right corner of the
display for easy reference.
I
Press
MODE
2
Press
MODE
3
OFF
Continued
Press
MODE
Page 11
Advanced Setup
b
Select the reversing valve
polarity for Heat Pump
operation:
O = Energize in cooling
b = Energize in heating
O
(Step 4 only appears if
heat pump is on in step 3)
On
Select Electric Heat operation:
On = 1st stage electric heat
Off = 1st stage gas heat
Off
(Step 5 only appears if
heat pump is off in step 3)
Adjust the deadband
for the 1st stage.
(1 - 6 )
Adjust the minimum difference
between cooling & heating
setpoints.
(0 - 6 )
Setup
0
Setup
Eh
Setup
2
Setup
2
Continued
4
5
OFF
6
7
COOL
HEAT
Press
MODE
Press
MODE
Press
MODE
Press
MODE
Page 12
Advanced Setup
Select the cycles per
hour limit:
d=cycles per hour
limit defeated
d1=d + defeat 5 min.
compressor lockout
(d1, d, 2 - 6)
On
Select backlight operation:
ON - Light continuously
OFF - Light for 8 seconds
after a button press
Off
C
Select thermostat
operation in degrees
Fahrenheit or Celsius.
F
Setup
8
6
Cy
Setup
9
ON
L I
Setup
I0
F
After programming is complete,
press the MODE and UP buttons
at the same time for two seconds
to leave the Setup screens. If no
buttons are pressed, the display
will leave the setup screens after
30 seconds.
Press
MODE
Press
MODE
MODE
FAN
Page 13
Advanced Setup
Advanced Setup Table
Step # Description Range Factory Default
1
Time of Day
2
Day of the Week
Heat Pump
3
Reversing Valve Polarity
4
Electric Heat
5
Deadband/Temp. Swing 1st Stage
6
Minimum Heat/Cool Differential
7
Cycles Per Hour
8
Thermoglow Backlight
9
Fahrenheit or Celsius
10
24 hour
Mo - Su
Off / On
O / b
Off / On
1 - 6
0 - 6
d, d1, 2 - 6
Off / On
F / C
12:00 am
Mo
Off
O
Off
2
2
6
On
F
Page 14
About Advanced Features & Operation
CALIBRATION - Under normal circumstances it will not be necessary to
adjust the calibration of the temperature. If calibration is required,
please contact a trained HVAC technician to correctly perform the
following procedure.
Pm
I2:00
Mo
Place the therm-
MODE
ostat in the OFF
mode.
Press
MODE button.
While holding the
MODE
MODE button,
press and hold the
DOWN button for
5 seconds. All icons
will appear on the display.
and hold the
I8:88
SuMoTuWeThFrSa
Morning
Fan On
o
OFF
Am
Night
Pm
Setup
88
o
COOL
AUTO
Locked
ONOFF
Program
On
HEAT
Evening
Day
88
DEADBAND OPERATION - Controls up to two Heat and two Cool stages
(please see the diagram on the next page).
The 1st Stage of heat or cool is turned on when:
(A) The temperature spread from the setpoint is equal to or greater
than: the setpoint plus the 1st stage deadband (step #6, page 12).
This 1st stage deadband is adjustable from 1-6 degrees and the
default is two degrees.
The 2nd Stage of heat or cool is turned on when:
(A) The 1st Stage has been on for a minimum of two minutes.
And
(B) The temperature spread from the setpoint is equal to or greater
than: the setpoint plus the 1st stage deadband (step #6, page 12),
plus the 2nd stage deadband. This 2nd stage deadband is fixed at
two degrees and is not adjustable.
Press the MODE
button once. The
thermostat temperature will be
displayed and
may be calibrated
using the UP or DOWN buttons.
After calibration is
MODE
complete, press
the MODE button
once to save
your changes and
return to normal operation.
I2:00
Mo
o
Pm
o
OFF
Page 15
About Advanced Features & Operation
Heating
Deadband Deadband DeadbandDeadband
(non-adj. 2 ) (non-adj. 2 )
2nd Stage
turn on
The above figure assumes the minimum on time for the prior stage
has been met to allow the next stage to turn on, once the deadbands
have been exceeded.
1st Stage
turn on
DECREASE INCREASE
db 1 db 1db 2 db 2
(adj. 1-6 ) (adj. 1-6 )
Heat
Cool
Setpoint
Setpoint
TEMPERATURE
ELECTRIC HEAT - Selecting Electric Heat (
Cooling
1st Stage
2nd Stage
turn on
turn on
step #5, page 12), will cause
the thermostat to turn on the fan immediately any time there is a heat
demand. Since most gas furnaces control the fan, this feature should be
off unless it is necessary for the thermostat to energize the fan with first
stage heat.
EMERGENCY HEAT - Only available if you have a Heat Pump
installed. To initiate the Emergency Heat feature, press the FAN
button. While holding the FAN button press the UP button. The
Cool setpoint display will read ‘EH’ (emergency heat).
Pm
I2:00
Mo
Press for
Emergency Heat
FAN
73
HEAT
74
Operation - During Emergency Heat operation the thermostat will turn on
the fan and the 2nd stage of heat when there is a demand for heat. Also
during Emergency Heat, the 1st stage of heating or cooling will be
unavailable.
Exit Emergency Heat - Follow the same steps as entering Emergency Heat
by pressing the FAN and UP buttons. During Emergency Heat, only OFF
and HEAT modes are available by pressing the MODE button.
Page 16
About Advanced Features & Operation
FACTORY DEFAULTS -
If, for any reason, you desire to return all the stored
settings back to the factory default settings, follow the instructions below.
WARNING: This will reset all Time Period and Advanced Programming to
the default settings. Any information entered prior to this reset will be
permanently lost.
Place the therm-
MODE
ostat in the OFF
mode.
Press
MODE button.
While holding the
MODE
MODE button, press
and hold the DOWN
button for 5 seconds. All icons will
appear on the display.
and hold the
I2:00
Mo
I8:88
SuMoTuWeThFrSa
Morning
Day
Fan On
Pm
Am
Pm
Evening
Setup
Night
o
88
o
COOL
AUTO
Locked
ONOFF
Program
HEAT
88
OFF
On
After all of the icons
appear, release the
MODE and DOWN
FAN
buttons. Then press
and hold the FAN
button for 5 seconds.
After the letters Fd
appear on the display
(Factory Default),
MODE
release the FAN
button. Press the
MODE button twice
to return to normal
operation.
I2:00
HEAT/COOL DIFFERENTIAL - The Heat and Cool setpoints will not be
allowed to come any closer to each other than the value set in Advanced
Setup step #7, on page 12. This minimum difference is enforced during
Auto-changeover and Program On operation.
Note: To increase the spread between the heating and cooling set-
points, press the MODE button until only the heat setpoint is displayed;
adjust to the desired setpoint. Press the MODE button until only the
cool setpoint is displayed; adjust to the desired setpoint. Press the
MODE button again to enter the Auto-changeover mode where both the
heat and cool setpoints are displayed.
Pm
Mo
o
OFF
MEMORY BACKUP - In the event of a power loss, the thermostat will
retain the stored program settings without external power or batteries.
Page 17
About Advanced Features & Operation
KEYPAD LOCKOUT - To prevent unauthorized use of the thermostat, the
front panel buttons may be disabled. To disable, or ‘lock’ the keypad,
press and hold the MODE button. While holding the MODE button,
press the UP and DOWN buttons together. The LOCKED icon will
appear on the display, then release the buttons.
Press all three
buttons in the order
outlined above for
keypad lockout
MODE
To unlock the keypad, press and hold the MODE button. While holding
the MODE button, press the UP and DOWN buttons together. The
LOCKED icon will disappear from the display, then release the buttons.
I2:00
Mo
Fan On
Day
Pm
76
o
COOL
Locked
Program
On
HEAT
68
Page 18
Warranty
One-Year Warranty - This Product is warranted to be free from defects in material and
workmanship. If it appears within one year from the date of original installation, whether or not
actual use begins on that date, that the product does not meet this warranty, a new or
remanufactured part, at the manufacturer’s sole option to replace any defective part, will be
provided without charge for the part itself provided the defective part is returned to the distributor
through a qualified servicing dealer.
THIS WARRANTY DOES NOT INCLUDE LABOR OR OTHER COSTS incurred for diagnosing, repairing,
removing, installing, shipping, ser vicing or handling of either defective parts or replacement
parts. Such costs may be covered by a separate warranty provided by the installer.
THIS WARRANTY APPLIES ONLY TO PRODUCTS IN THEIR ORIGINAL INSTALLATION LOCATION AND
BECOMES VOID UPON REINSTALLATION.
LIMITATIONS OF WARRANTIES – ALL IMPLIED WARRANTIES (INCLUDING IMPLIED WARRANTIES OF
FITNESS FOR A PARTICULAR PURPOSE AND MERCHANTABILITY) ARE HEREBY LIMITED IN DURATION TO
THE PERIOD FOR WHICH THE LIMITED WARRANTY IS GIVEN. SOME STATES DO NOT ALLOW LIMITATIONS
ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE MAY NOT APPLY TO YOU. THE
EXPRESSED WARRANTIES MADE IN THIS WARRANTY ARE EXCLUSIVE AND MAY NOT BE ALTERED,
ENLARGED, OR CHANGED BY ANY DISTRIBUTOR, DEALER, OR OTHER PERSON WHATSOEVER. ALL
WORK UNDER THE TERMS OF THIS WARRANTY SHALL BE PERFORMED DURING NORMAL WORKING
HOURS. ALL REPLACEMENT PARTS, WHETHER NEW OR REMANUFACTURED, ASSUME AS THEIR
WARRANTY PERIOD ONLY THE REMAINING TIME PERIOD OF THIS WARRANTY.
1. Normal maintenance as outlined in the installation and servicing instructions or owner’s
manual, including filter cleaning and/or replacement and lubrication.
2. Damage or repairs required as a consequence of faulty installation, misapplication,
abuse, improper servicing, unauthorized alteration or improper operation.
3. Failure to start due to voltage conditions, blown fuses, open circuit breakers or other
damages due to the inadequacy or interruption of electrical service.
4. Damage as a result of floods, winds, fires, lightning, accidents, corrosive environments or
other conditions beyond the control of the Manufacturer.
5. Parts not supplied or designated by the Manufacturer, or damages resulting from their use.
6. Manufacturer products installed outside the continental U.S.A., Alaska, Hawaii, and
Canada.
7. Electricity or fuel costs or increases in electricity or fuel costs for any reason whatsoever
including additional or unusual use of supplemental electric heat.
8. ANY SPECIAL INDIRECT OR CONSEQUENTIAL PROPERTY OR COMMERCIAL DAMAGE OF ANY
NATURE WHATSOEVER. Some states do not allow the exclusion of incidental or
consequential damages, so the above may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which may
vary from state to state.
THE MANUFACTURER WILL NOT BE RESPONSIBLE FOR:
Page 19
P/N 88-609
Rev. 1
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