Venstar TSTATEZ Programmable Thermostat
Features
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 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 INSTRUCTIONS
CAUTION Follow Installation Instructions carefully. DISCONNECT POWER TO THE HEATER – AIR CONDITIONER BEFORE REMOVING THE OLD THERMOSTAT AND INSTALLING THE NEW THERMOSTAT.
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions:
- This device may not cause harmful interference, and
- this device must accept any interference received, including interference that may cause undesired operation.
PREPARATION
STEP #1
- Proper installation of the thermostat will beProper installation of the thermostat will be accomplished by following these stepaccomplished by following these step by step instructions. If you are unsureby step instructions. If you are unsure about any of these steps, call a qualifiedabout any of these steps, call a qualified technician for assistance.technician for assistance.
- These tools will be required:
- Make sure your Heater/Air Conditioner is working properly before beginning installation of the thermostat.
- Carefully unpack the thermostat. Save the screws and instructions.
- Turn off the power to the Heating/Air Conditioning system at the main fuse panel. Most residential systems have a separate breaker for disconnecting power to the furnace.
STEP #2
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.
STEP #3
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.
- C may not be used on all systems.
- O/B is used if your system is a Heat Pump.
Sample Wiring Diagrams
5 Wire, 1 Stage Cooling, 1 Stage Gas Heat
Residential Gas or Electric Heat *, Electric Cool, split systems & package units.
4 Wire, 1 Stage Cooling, 1 Stage Gas Heat
Residential Gas or Electric Heat *, Electric Cool, split systems & package units
If using electric heat this option must be selected on during advanced setup.
6 Wire, 2 Stage Cooling, 1 Stage Heat
Residential 2 Stage Cooling, with Gas or Electric Heat*
6 Wire, 1 Stage Cooling, 2 Stage Heat
Residential & Commercial 1 Stage Cooling, with 2 Stage Gas or Electric Heat.
If using electric heat this option must be selected on during advanced setup.
7 Wire, 2 Stage Cooling, 2 Stage Heat
Commercial Gas or Electric Heat *, Electric Cool, split systems & package units including Commercial Heat Pumps
If using electric heat, this option must be selected on during advanced setup.
Commercial Heat Pumps do not have the heat pump turned on in advanced setup.
5 Wire, 1 Stage Cooling, 1 Stage Heat – Heat Pump
No auxiliary heat, Residential Heat Pumps , split systems & package units
If using Residential Heat Pump, this option must be selected on during advanced setup.
6 Wire, 1 Stage Cooling, 2 Stage Heat, Heat Pump
Most residential split and package heat pumps with auxiliary heat
The heat pump option must be selected on during advanced setup.
STEP #4
TEST OPERATION
- 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.
- 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.
- 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.
TROUBLESHOOTING
- SYMPTOM: When using 4 wires (R, G, W, Y), 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.
- SYMPTOM: The air conditioning does not 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 10 of the Owner’s Manual and configure step 8 to defeat the 5- minute compressor lockout. - SYMPTOM: The display is blank.
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. - SYMPTOM: When controlling a Residential Heat 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. - SYMPTOM: When calling for cooling, both 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.
References:
Download Manual
Venstar TSTATEZ Programmable Thermostat Owner Manual
OTHER MANUAL
Venstar TSTATEZ Programmable Thermostat Installation Instruction
