Table of Contents
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Digital
Digital
Thermostat
Thermostat
Stages: 2-Heat, 1-Cool
Battery or System Powered
Auxiliary Heat Indicator
Fahrenheit or Celsius
Bi-Color LED
(when system powered)
Use with most 1 or 2 Stage Heat Pump Heat and 1 stage Heat Pump Cool units
OWNER'S
OWNER'S
MANUAL
MANUAL
Venstar Inc. 05/08
residential
THERMOSTAT
T0140
NON-
NON-
PROGRAMMABLE
PROGRAMMABLE
up to
2-heat
up to
2-heat
& 1-cool
& 1-cool
HEAT
HEAT
PUMP
PUMP
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Table of Contents
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Summary of Contents for Venstar T0140
- Page 1 Stages: 2-Heat, 1-Cool Battery or System Powered Auxiliary Heat Indicator Fahrenheit or Celsius Bi-Color LED (when system powered) Use with most 1 or 2 Stage Heat Pump Heat and 1 stage Heat Pump Cool units OWNER’S OWNER’S MANUAL MANUAL Venstar Inc. 05/08...
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Page 2: Table Of Contents
OWNER'S MANUAL T0140 Contents Page # Safety Warnings Front Panel Display Normal Operation Aux Heat Fahrenheit or Celsius Preparation Remove Old Thermostat Battery Replacement Wire Connections Test Operation Troubleshooting Warranty Page 2... -
Page 3: Safety Warnings
OWNER'S MANUAL T0140 Safety Warnings P/N T0140 CAUTION Follow Installation Instructions carefully. DISCONNECT POWER TO THE HEATER - AIR CONDITIONER BEFORE REMOVING THE OLD THERMOSTAT AND INSTALLING WARNING THE NEW THERMOSTAT. CAUTION The two Alkaline “AA” batteries must be replaced at least once every 12 months to ensure proper operation. -
Page 4: Front Panel
OWNER'S MANUAL T0140 Front Panel MODE SWITCH DISPLAY Cool, Off or Heat COOLER & WA R M E R BUTTONS BI-COLOR LED Heat or Cool demand indicator when system powered: Red = Heat Green = Cool FAN SWITCH AUX HEAT... -
Page 5: Display
OWNER'S MANUAL T0140 Display SET TEMP HEAT COOL BATTERY Heat and Cool indicators. In normal operation, Heat or Cool appears, depending on the Mode Switch position. When heat or cool is energized, the Heat or Cool indicator will flash. If the thermostat is system powered the bi-color LED will also illuminate (red for heating and green for cooling). -
Page 6: Normal Operation
OWNER'S MANUAL T0140 Normal Operation MODE SWITCH Cool, Off or Heat COOLER & WA R M E R BUTTONS HEAT FAN SWITCH On or Auto Operation Select Cool or Heat with the Mode Switch. Normally leave the fan switched to Auto. -
Page 7: Aux Heat
OWNER'S MANUAL T0140 Aux Heat HEAT AUX HEAT SWITCH Emergency - Disables all compressor functions* and energizes only Aux Heat to satisfy the heat demand. Normal - Aux Heat is allowed to run, if necessary, along with the heat pump to satisfy the heat demand. -
Page 8: Fahrenheit Or Celsius
OWNER'S MANUAL T0140 Fahrenheit or Celsius MODE SWITCH Cool, Off or Heat COOLER & WA R M E R BUTTONS HEAT 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. -
Page 9: Preparation
OWNER'S MANUAL T0140 Preparation Proper installation of the thermostat will be HEAT accomplished by following these step by step instructions. If you are unsure about any of these steps, call a qualified technician for assistance. These tools will be required:... -
Page 10: Remove Old Thermostat
OWNER'S MANUAL T0140 Remove & Replace Old Thermostat Remove the cover of the old thermostat. HEAT If it does not come off easily check for screws. Loosen the screws holding the thermostat HEAT base or subbase to the wall, and lift away. -
Page 11: Battery Replacement
OWNER'S MANUAL T0140 Battery Replacement 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 the battery cover (fig. 1) and pull out (fig. 2). -
Page 12: Wire Connections
OWNER'S MANUAL T0140 Wire Connections If the terminal designations on your old HEAT thermostat do not match those on the new thermostat, refer to the chart below or the wiring diagrams that follow. Install on the Wire from the new thermostat... -
Page 13: Sample Wiring Diagrams
OWNER'S MANUAL T0140 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. Common wire optional O B G W Y R C... - Page 14 OWNER'S MANUAL T0140 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. Common wire optional O B G W Y R C...
- Page 15 OWNER'S MANUAL T0140 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. Common wire optional O B G W Y R C...
- Page 16 OWNER'S MANUAL T0140 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. Common wire optional O B G W Y R C...
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Page 17: Test Operation
OWNER'S MANUAL T0140 Test Operation Turn on the power to the Heat Pump. HEAT On the thermostat, slide the Mode Switch HEAT 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. - Page 18 OWNER'S MANUAL T0140 Test Operation On the thermostat, slide the Mode Switch HEAT 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).
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Page 19: Trouble Shooting
OWNER'S MANUAL T0140 Trouble Shooting SYMPTOM: The slide switches on the thermostat HEAT are very difficult to move. CAUSE: The backplate of the thermostat is screwed too tightly into a wall that is not perfectly flat. REMEDY: Loosen the screws holding the thermostat into the wall. - Page 20 OWNER'S MANUAL T0140 Trouble Shooting SYMPTOM: Aux Heat does not turn on. HEAT 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).
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Page 21: Warranty
OWNER'S MANUAL T0140 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...