reside ntial
THERMOSTAT
Digital
Digital
Thermostat
Thermostat
Single Day
Single Day
PROGRAMMABLE
PROGRAMMABLE
up to
up to
& 2-cool
& 2-cool
Control up to 2 Heat &
2 Cool Stages
HP Stages: 2 Heat, 2 cool
Single Day Programmable
4 Settings Per Day
Auto Changeover
5 min. Built-In Compressor
HEAT
COOL
Use with most Air Conditioning & Heating Systems including: 1 or 2 Stage
Electric Cooling & 2 Stage Gas Heating, Heat Pump, Electric or Hydronic Heat.
HEAT
PUMP
INSTALLATION
INSTALLATION
INSTRUCTIONS
INSTRUCTIONS
Venstar Inc. 08/07
Protection
Back-Lit Display
One For All Works with
Virtually All Equipment
‘O’ or ‘B’ Terminal
Non-Volatile Memory
Keypad Lockout
Display Either F or C
T1010
2-heat
2-heat
Table Of Contents
Step #1: Preparation
Step #2: Remove & Replace
2
3
Old Thermostat
Step #3: Wire Connections
Sample Wiring Diagrams
Step #4: Test Operation
Trouble Shooting
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
WARNING
4
5
12
13
P/N T1010
This device complies with Part 15 of the FCC rules.
Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received,
including interference that may cause undesired operation.
Page 1
STEP #1
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Make sure your Heater/Air Conditioner is
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working properly before beginning installation
of the thermostat.
Carefully unpack the thermostat. Save the
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screws, wall anchors, and instructions.
PREPARATION
Proper installation of the thermostat will be
accomplished by following these step by step
instructions. If you are unsure about any of
these steps, call a qualified technician for
assistance.
Assemble tools.
Drill with 3/16
inch Drill Bit
Flat Blade
Screwdriver
Wire cutter
& Stripper
(when not using
j-box)
Turn off the power to the Heating/Air
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Conditioning system at the main fuse panel.
Most residential systems have a separate
breaker for disconnecting power to the furnace.
Page 2
STEP #2
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COOL
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COOL
AUTO
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68
COOL
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68
REMOVE & REPLACE OLD THERMOSTAT
Remove the cover of the old thermostat.
If it does not come off easily check for
screws.
Loosen the screws holding the thermostat
base or subbase to the wall, and lift away.
Disconnect the wires from the old
thermostat. Tape the ends of the wires
as you disconnect them, and mark them
with the letter of the terminal for easy
reconnection to the new thermostat.
Keep the old thermostat for reference
purposes, until your new thermostat is
functioning properly.
Page 3
STEP #3
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WIRE CONNECTIONS
If the terminal designations on your old
thermostat do not match those on the
new thermostat, refer to the chart below,
or the wiring diagrams that follow.
Wire from the
old thermostat
terminal marked
Function
In s t a ll o n t h e
new t hermos t at
connector marked
G or F Fan G
Y1, Y or C
W1, W or H
Cooling Y1
Heating
W1,O,B
PowerRh, R, M, Vr, A R
C
O/b
Y2
W2
Common
Rev. Valve
2nd Stage Cool
2nd Stage Heat
W1,O,B**
* C may not be used on all systems.
** O/b is used if your system is a Heat Pump.
Page 4
C *
Y2
W2
Sample Wiring DiagramsSample Wiring Diagrams
Gas or Electric Heat
5 Wire, 1 Stage Cooling, 1 Stage Gas Heat
POWER
COMPRESSOR
GAS VALVE
or
STRIP HEAT
COMMON
FAN
R
G
Y
W
C
Residential Gas or Electric Heat*,
Electric Cool, split systems & package
units
B
O
C
Y2
1
W
W2
1
Y
G
R
* If using first stage electric heat, this option must be
selected ON (see page 11, step #6 of Owner’s Manual).
Page 5
Sample Wiring Diagrams
Gas or Electric Heat
4 Wire, 1 Stage Cooling, 1 Stage Gas Heat
POWER
COMPRESSOR
GAS VALVE
or
STRIP HEAT
FAN
R
G
Y
W
Residential Gas or Electric Heat*,
Electric Cool, split systems & package
units
B
O
C
Y2
1
W
W2
1
Y
G
R
* If using first stage electric heat, this option must be
selected ON (see page 11, step #6 of Owner’s Manual).
Page 6
Sample Wiring Diagrams
Gas or Electric Heat
6 Wire, 2 Stage Cooling, 1 Stage Gas Heat
POWER
COMPRESSOR
GAS VALVE
or
STRIP HEAT
2nd STAGE
COOLING
COMMON
FAN
R
G
Y
W
Y2
C
Residential two stage cooling with
Gas or Electric Heat*.
B
O
C
Y2
1
W
W2
1
Y
G
R
* If using first stage electric heat, this option must be
selected ON (see page 11, step #6 of Owner’s Manual).
Page 7
Sample Wiring Diagrams
Gas or Electric Heat
6 Wire, 1 Stage Cooling, 2 Stage Heat
POWER
COMPRESSOR
2nd STAGE
HEATING
GAS VALVE
or
STRIP HEAT
COMMON
FAN
R
G
Y
W2
W
C
Residential & commercial 1 Stage Cooling,
with 2 Stage Gas or Electric Heat*
B
O
C
Y2
1
W
W2
1
Y
G
R
* If using first stage electric heat, this option must be
selected ON (see page 11, step #6 of Owner’s Manual).
Page 8
Sample Wiring Diagrams
Gas or Electric Heat
7 Wire, 2 Stage Cooling, 2 Stage Heat
Commercial Gas or Electric Heat *,
Electric Cool, split systems & package units
including Commercial Heat Pumps **
B
O
C
Y2
1
W
W2
1
Y
G
R
POWER
COMPRESSOR
2nd STAGE
HEATING
GAS VALVE
or
STRIP HEAT
2nd STAGE
COOLING
COMMON
If using first stage electric heat, this option must be
*
FAN
R
G
Y
W2
W
Y2
C
selected ON (see page 11, step #6 of Owner’s Manual).
** Commercial heat pumps do not have the heat pump turned
ON in advanced setup (see page 11, step #4 of Owner’s Manual).
Page 9
Sample Wiring Diagrams
Heat Pump
5 Wire, 1 Stage Cooling, 1 Stage Heat-Heat Pump* with O or b reversing valve**.
Residential Heat Pumps, split systems & package units, with no auxiliary heat.
B
O
C
Y2
1
W
W2
1
Y
G
R
POWER
COMPRESSOR
REVERSING VALVE**
COMMON
FAN
R
G
Y
O/B
C
* This option must be selected ON during advanced setup
(see page 11, step #4 of Owner’s Manual).
** This option must be selected O or b during advanced setup
(see page 11, step #5 of Owner’s Manual).
Page 10
Sample Wiring Diagrams
Heat Pump
6 Wire, 1 Stage Cooling, 2 Stage Heat-Heat Pump* with O or b reversing valve**.
Residential Heat Pumps, split systems & package units, with auxiliary heat.
B
O
C
Y2
1
W
W2
1
Y
G
R
POWER
COMPRESSOR
2nd STAGE
HEATING
REVERSING VALVE**
COMMON
FAN
R
G
Y
W2
O/B
C
* This option must be selected ON during advanced setup
(see page 11, step #4 of Owner’s Manual).
** This option must be selected O or b during advanced setup
(see page 11, step #5 of Owner’s Manual).
Page 11
STEP #4
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TEST OPERATION
Turn the power on to the Heating/Air
Conditioning system.
Press the MODE button repeatedly until
the HEAT icon appears on the display.
Press the UP or DOWN buttons until the set
temperature is 10 degrees above room
temperature. The HVAC unit should
energize in the heating mode.
Press the MODE button repeatedly until
the COOL icon appears on the display.
Press the UP or DOWN buttons until the set
temperature is 10 degrees below room
temperature. The HVAC unit should
energize in the cooling mode.
NOTE: Most equipment has a time delay
of 5 minutes between cool cycles. This
feature is defeatable on the thermostat
(see page 12, step #9 of Owner's Manual).
Press the UP button until the setpoint is
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equal to the room temperature. Press the
FAN button to Fan On. The fan should turn
on and run continuously.
Page 12
TROUBLESHOOTING
SYMPTOM: When using 4 wires (R, G, W, Y),
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the air conditioning equipment tries
repeatedly to turn on, but cannot. At
times the display dims or disappears.
CAUSE: There is not enough power available
to "power share".
REMEDY: Connect a 270 ohm, 10 watt power
resistor at the furnace as shown below.
For Problem A/C For Problem Heat
R G W Y C
R G W Y C
TR300-10w
SYMPTOM: The air conditioning does not
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attempt to turn on.
CAUSE: The compressor timer lockout may
prevent the air conditioner from
turning on, for a period of time.
REMEDY: See page 12 of the Owner's Manual
and configure step #9 to defeat the 5 minute compressor lockout.
SYMPTOM: The display is blank.
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CAUSE: Lack of proper power.
REMEDY: Make sure power is turned on to
the furnace and 24vac between R & W.
If C is used, 24vac between R & C.
Page 13
TR300-10w
TROUBLESHOOTING
SYMPTOM: When controlling a residential heat
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pump, and asking for cooling, the heat
comes on.
CAUSE: Heat pump is not selected "ON" in the
Advanced Setup.
REMEDY: See page 11 of the Owner's Manual
and configure step #4 to enable heat pump
operation.
SYMPTOM: When calling for cooling, both
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the heat and cool come on.
CAUSE: The thermostat is configured to
control a heat pump and the HVAC
system is a "conventional" (non-heat
pump) system.
REMEDY: See page 11 of the Owner's Manual
and set step #4 to OFF to enable gas
electric operation.
4Z95
STAR T1010
Tested to Comply
c
with FCC Standards
C
F
FOR HOME OR OFFICE USE
Page 14
P/N 88-608
Rev. 1
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