Stat
Stat
asy
E
Single Day
Single Day
PROGRAMMABLE
PROGRAMMABLE
residential
T H E R M O S T AT
TSTATEZ
world’s easiest
world’s easiest
PROGRAMMABLE THERMOSTAT
PROGRAMMABLE THERMOSTAT
up to
up to
& 2-cool
& 2-cool
One for All - Can Control:
- Gas / Electric
- Heat Pump
- Electric Heat
- Hydronic Systems
Non-Volatile Memory - Retains settings
in the event of a power failure
Outdoor Sensor Ready Compatible with the
optional wired, or wireless
HEAT
COOL
Outdoor Sensor
Use with most Air Conditioning & Heating Systems including: 1 or 2 Stage
Electric Cooling & 2 Stage Gas Heating, Heat Pump, Electric or Hydronic Heat.
INSTALLATION
INSTALLATION
INSTRUCTIONS
INSTRUCTIONS
Venstar Inc. 08/07
2-heat
2-heat
HEAT
PUMP
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
9
10
P/N TSTAT1100EZ
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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PREPARATION
Proper installation of the thermostat will be
Proper installation of the thermostat will be
accomplished by following these step
accomplished by following these step
by step instructions. If you are unsure
by step instructions. If you are unsure
about any of these steps, call a qualified
about any of these steps, call a qualified
technician for assistance.
technician for assistance.
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These tools will be required:
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Flat Blade
Screwdriver
Make sure your Heater/Air Conditioner
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is working properly before beginning
Wire cutter
& Stripper
installation of the thermostat.
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Carefully unpack the thermostat.
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Save the screws and instructions.
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
REMOVE & REPLACE OLD THERMOSTAT
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Remove the cover of the old thermostat.
If it does not come off easily check for
screws.
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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.
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Keep the old thermostat for reference
purposes, until your new thermostat is
functioning properly.
Page 3
STEP #3
WIRE CONNECTIONS
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Wire from the
old thermostat
terminal marked
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.
Install on the
Function
G or F Fan G
Y1, Y or C
W1, W or H
Cooling Y1
Heating
PowerRh, R, M, Vr, A R
C
O/B
Y2
W2
RS+5 RS+5
RS RS
RS G GND
Common
Rev. Valve
2nd Stage Cool
2nd Stage Heat
Remote Sensor +5vdc
Remote Sensor Signal
Remote Sensor Ground
* C may not be used on all systems.
** O/B is used if your system is a Heat Pump.
new thermostat
connector marked
W1,O,B
C *
W1,O,B**
Y2
W2
Page 4
Sample Wiring Diagrams
5 Wire, 1 Stage Cooling, 1 Stage Gas Heat
O
R
W2
Y2
W1
Y1
C
G
Thermostat
4 Wire, 1 Stage Cooling, 1 Stage Gas Heat
O
R
W2
Y2
W1
Y1
C
G
Thermostat
* If using electric heat this option must be
selected on during advanced setup.
Page 5
Residential Gas or Electric Heat *,
Electric Cool, split systems & package
units
24 vac common
fan relay
compressor relay
1st stage heat circuit
24 vac return
Residential Gas or Electric Heat *,
Electric Cool, split systems & package
units
fan relay
compressor relay
1st stage heat circuit
24 vac return
L
E
C
G
Y1
O
W1
R
Y2
W2
L
E
C
G
Y1
O
W1
R
Y2
W2
Sample Wiring Diagrams
6 Wire, 2 Stage Cooling, 1 Stage Heat
O
R
W2
Y2
W1
Y1
C
G
Thermostat
6 Wire, 1 Stage Cooling, 2 Stage Heat
W2
O
R
W1
Y1
C
G
Y2
Thermostat
Residential 2 Stage Cooling, with
Gas or Electric Heat*
24 vac common
fan relay
compressor relay
1st stage heat circuit
24 vac return
2nd stage compressor relay
Residential & Commercial 1 Stage Cooling,
with 2 Stage Gas or Electric Heat*
24 vac common
fan relay
compressor relay
1st stage heat circuit
24 vac return
2nd stage heat circuit
L
E
C
G
Y1
O
W1
R
Y2
W2
L
E
C
G
Y1
O
W1
R
Y2
W2
* If using electric heat this option must be
selected on during advanced setup.
Page 6
Sample Wiring Diagrams
7 Wire, 2 Stage Cooling, 2 Stage Heat
O
R
Y2
W2
* If using electric heat, this option must
be selected on during advanced setup.
5 Wire, 1 Stage Cooling, 1 Stage Heat - Heat Pump***
Y2
W2
*** If using Residential Heat Pump, this option
must be selected on during advanced setup.
Y1
W1
O
R
W1
C
G
Y1
C
G
Commercial Gas or Electric Heat *,
Electric Cool, split systems & package units
including Commercial Heat Pumps **
Thermostat
1st stage heat circuit
2nd stage compressor relay
** Commercial Heat Pumps do not have
the heat pump turned on in advanced setup.
Thermostat
2nd stage heat circuit
No auxiliary heat,
Residential Heat Pumps ,
split systems & package units
24 vac common
fan relay
compressor relay
24 vac return
24 vac common
fan relay
compressor relay
reversing valve
24 vac return
L
E
C
G
Y1
O
W1
R
Y2
W2
L
E
C
G
Y1
O
W1
R
Y2
W2
Page 7
Sample Wiring Diagram
6 Wire, 1 Stage Cooling, 2 Stage Heat, Heat Pump *
O
R
W1
Y1
C
G
Y2
W2
* The heat pump option must be selected
on during advanced setup.
Most residential split and package heat pumps
with auxiliary heat
Thermostat
compressor relay
1st stage heat circuit
2nd stage heat circuit
24 vac common
fan relay
24 vac return
L
E
C
G
Y1
O
W1
R
Y2
W2
Page 8
STEP #4
TEST OPERATION
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Turn the power on to the Heating/Air
Conditioning system.
On the thermostat, press the MODE/NEXT
button repeatedly until the HEAT icon
appears on the display. Press the UP or
DOWN button until the set temperature is 10
degrees above room temperature. The
HVAC unit should energize in the heating
mode. Note: You may need to wait up to five
minutes for heating to energize due to the
compressor lockout feature.
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On the thermostat, press the MODE/NEXT
button repeatedly until the COOL icon
appears on the display. Press the UP or
DOWN button until the set temperature is 10
degrees below room temperature. The
HVAC unit should energize in the cooling
mode. Note: You may need to wait up to five
minutes for cooling to energize due to the
compressor lockout feature.
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Press the UP button until the setpoint is
equal to the room temperature. Press
the FAN button to Fan On. The fan should
turn on and run continuously.
Page 9
TROUBLESHOOTING
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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
TR300-10w
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SYMPTOM: The air conditioning does not
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attempt to turn on.
R G W Y C
TR300-10w
CAUSE: The compressor timer lockout may
prevent the air conditioner from
turning on, for a period of time.
REMEDY: See page 10 of the Owner's Manual
and configure step 8 to defeat the 5 minute compressor lockout.
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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 there are 24vac
between R & W. If C is used, there
needs to be 24vac between R & C.
Page 10
TROUBLESHOOTING
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SYMPTOM: When controlling a Residential Heat
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Pump, cooling energizes with a demand for
heat.
CAUSE: Heat pump is not selected "YES" in the
Advanced Setup.
REMEDY: See page 9 of the Owner's Manual
and configure step 4 to enable heat pump
operation.
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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 9 of the Owner's Manual
and set step 4 to "NO” to enable gas
electric operation.
Slimline
F
FOR HOME OR OFFICE USE
4Z95
Tested to Comply
c
with FCC Standards
C
TSTAT1100EZ
Page 11
P/N 88-612
Rev. 1
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