1. DL manuals
  2. Venstar
  3. Thermostat
  4. T0140
  5. Owner's Manual

Venstar T0140 Owner's Manual

Manual is about: Residential

Summary of T0140

  • Page 1

    Venstar inc. 05/08 digital thermostat digital thermostat residential t0140 thermostat owner’s manual owner’s manual use with most 1 or 2 stage heat pump heat and 1 stage heat pump cool units stages: 2-heat, 1-cool battery or system powered auxiliary heat indicator fahrenheit or celsius programmable ...

  • Page 2: Contents

    Page 2 contents page # remove old thermostat safety warnings front panel display normal operation preparation battery replacement warranty test operation troubleshooting wire connections fahrenheit or celsius aux heat owner's manual t0140

  • Page 3: Safety Warnings

    Caution follow installation instructions carefully. Disconnect power to the heater - air conditioner before removing the old thermostat and installing the new thermostat. Warning page 3 safety warnings caution the two alkaline “aa” batteries must be replaced at least once every 12 months to ensure p...

  • Page 4: Front Panel

    70 front panel page 4 emergency normal lockout aux heat switch owner's manual t0140 battery door cooler & wa r m e r buttons mode switch cool, off or heat on or auto fan switch display bi-color led heat or cool demand indicator when system powered: red = heat green = cool.

  • Page 5: Display

    88 set temp heat aux cool low battery page 5 display indicates auxiliary heat is energized. Desired set temperature indicator. When this indicator is on, the large numbers represent the desired room temperature. Pressing the cooler or warmer button during normal operation will cause the large number...

  • Page 6: Normal Operation

    70 heat page 6 normal operation operation select cool or heat with the mode switch. Normally leave the fan switched to auto. In fan auto, the fan will turn on only with a heat or cool demand. When fan on is selected, the fan will run continuously. Adjust the desired set temperature with the cooler o...

  • Page 7: Aux Heat

    70 heat page 7 aux heat normal - aux heat is allowed to run, if necessary, along with the heat pump to satisfy the heat demand. Lockout - aux heat will never turn on regardless of the heat demand. When the aux heat switch is in the emergency position the compressor will also be locked out during coo...

  • Page 8: Fahrenheit Or Celsius

    24 heat page 8 fahrenheit or celsius operation select off with the mode switch. Press and hold the cooler and warmer buttons at the same time until the temperature is displayed in degrees celsius. Repeat this process to display the temperature in degrees fahrenheit. Owner's manual t0140 cooler & wa ...

  • Page 9: Preparation

    Page 9 these tools will be required: flat blade screwdriver wire cutter & stripper carefully unpack the thermostat. Save the screws and instructions. Proper installation of the thermostat will be accomplished by following these step by step instructions. If you are unsure about any of these steps, c...

  • Page 10: Remove & Replace

    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...

  • Page 11: Battery Replacement

    70 heat page 11 battery replacement owner's manual t0140 the batteries must be replaced immediately when the thermostat displays the low battery icon. The batteries are easily accessible from the battery slot located on the front of the thermostat (fig. 1). To open the battery slot, press down on th...

  • Page 12: Wire Connections

    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 install on the new thermostat connector marked (energize to heat) c rc, r,...

  • Page 13: Sample Wiring Diagrams

    Sample wiring diagrams 4 wire, 1 stage cooling, 1 stage heat-heat pump with o reversing valve. Residential heat pumps, split systems & package units, with no auxiliary heat. Page 13 * common wire is optional in all installations. If a common wire is not used the thermostat must be powered by two aa ...

  • Page 14: Sample Wiring Diagrams

    Sample wiring diagrams 5 wire, 1 stage cooling, 2 stage heat-heat pump with o reversing valve. Residential heat pumps, split systems & package units, with auxiliary heat. Page 14 * common wire is optional in all installations. If a common wire is not used the thermostat must be powered by two aa alk...

  • Page 15: Sample Wiring Diagrams

    Sample wiring diagrams 4 wire, 1 stage cooling, 1 stage heat-heat pump with b reversing valve. Residential heat pumps, split systems & package units, with no auxiliary heat. Page 15 * common wire is optional in all installations. If a common wire is not used the thermostat must be powered by two aa ...

  • Page 16: Sample Wiring Diagrams

    Sample wiring diagrams 5 wire, 1 stage cooling, 2 stage heat-heat pump with b reversing valve. Residential heat pumps, split systems & package units, with auxiliary heat. Page 16 * common wire is optional in all installations. If a common wire is not used the thermostat must be powered by two aa alk...

  • Page 17: Test Operation

    Page 17 turn on the power to the heat pump. Test operation on the thermostat, slide the mode switch to heat . Press the cooler or warmer 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 min...

  • Page 18: Test Operation

    Page 18 test operation on the thermostat, slide the mode switch to cool . Press the cooler or warmer button until the set temperature is 10 degrees below room temperature. The hvac unit should energize in the cooling mode (page 6). Note: you may need to wait up to five minutes for cooling to energiz...

  • Page 19: Trouble Shooting

    Page 19 symptom: the air conditioning does not attempt to turn on. Cause: the cooling setpoint is set too high, the mode switch is not set for cool, the batteries are too weak, or the aux. Heat switch is set for emergency. Remedy: consult the normal operation section in this manual to: l ower the co...

  • Page 20: Trouble Shooting

    Page 20 trouble shooting symptom: aux heat does not turn on. Cause: the aux heat switch is set for lockout. Remedy: consult the aux heat section of this manual to slide the aux heat switch to normal (page 7). Symptom: the heating does not attempt to turn on. Cause: the heating setpoint is set too hi...

  • Page 21: Warranty

    Page 21 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 remanufactur...