residential THERMOSTAT Digital Thermostat T0140 NON- PROGRAMMABLE up to 2-heat & 1-cool HEAT PUMP 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 MANUAL Venstar Inc.
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
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 THE NEW THERMOSTAT. WARNING CAUTION The two Alkaline “AA” batteries must be replaced at least once every 12 months to ensure proper operation. The “Low Battery” icon will appear on the thermostat display when it is time to replace the batteries.
OWNER'S MANUAL T0140 Front Panel DISPLAY MODE SWITCH Cool, Off or Heat COOLER & WA R M E R BUTTONS 70 BI-COLOR LED Heat or Cool demand indicator when system powered: Red = Heat Green = Cool FAN SWITCH AUX HEAT SWITCH On or Auto Emergency Normal Lockout Page 4 BATTERY DOOR
OWNER'S MANUAL T0140 Display 88 SET TEMP AUX HEAT COOL LOW 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). Current room or set temperature. Desired set temperature indicator.
OWNER'S MANUAL T0140 Normal Operation MODE SWITCH Cool, Off or Heat HEAT COOLER & WA R M E R BUTTONS 70 FAN SWITCH On or Auto 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 or WARMER buttons.
OWNER'S MANUAL T0140 Aux Heat HEAT 70 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. 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 cooling operation.
OWNER'S MANUAL T0140 Fahrenheit or Celsius MODE SWITCH Cool, Off or Heat HEAT COOLER & WA R M E R BUTTONS 24 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 Preparation HEAT 70 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. HEAT 70 These tools will be required: Flat Blade Screwdriver Wire cutter & Stripper HEAT 70 Make sure your Heat Pump is working properly before beginning installation of the thermostat. HEAT 70 Carefully unpack the thermostat. Save the screws and instructions.
OWNER'S MANUAL T0140 Remove & Replace Old Thermostat HEAT 70 Remove the cover of the old thermostat. If it does not come off easily check for screws. HEAT 70 Loosen the screws holding the thermostat base or subbase to the wall, and lift away. HEAT 70 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.
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). Pull out HEAT 70 Press down Battery slot (Bottom View) FIG. 1 FIG. 2 Remove the old batteries and replace with the new AA alkaline batteries (fig. 3). New batteries in Old batteries out FIG.
OWNER'S MANUAL T0140 Wire Connections HEAT 70 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 C (optional) C Common Rc, R, M, Vr, A Power R Y1 or Y Cooling Y W1, W or H Auxiliary Heat W G or F Fan G Rev. Valve B B (Energize to Heat) O Rev.
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 GW Y R C FAN G REVERSING VALVE O COMPRESSOR Y POWER R 4 Conductor 18 to 22 gauge unshielded cable from the thermostat to the equipment. * Common wire is optional in all installations. If a common wire is not used the thermostat must be powered by two AA alkaline batteries.
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 GW Y R C FAN G REVERSING VALVE O AUXILIARY HEAT Y COMPRESSOR W POWER R 5 Conductor 18 to 22 gauge unshielded cable from the thermostat to the equipment. * Common wire is optional in all installations.
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 GW Y R C FAN G REVERSING VALVE B COMPRESSOR Y POWER R 4 Conductor 18 to 22 gauge unshielded cable from the thermostat to the equipment. * Common wire is optional in all installations. If a common wire is not used the thermostat must be powered by two AA alkaline batteries.
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 GW Y R C FAN G REVERSING VALVE B AUXILIARY HEAT Y COMPRESSOR W POWER R 5 Conductor 18 to 22 gauge unshielded cable from the thermostat to the equipment. * Common wire is optional in all installations.
OWNER'S MANUAL T0140 Test Operation HEAT 70 Turn on the power to the Heat Pump. HEAT 70 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 minutes for heating to energize due to the compressor lockout feature. There is a two minute minimum run-time for first stage heating.
OWNER'S MANUAL T0140 Test Operation HEAT 70 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 energize due to the compressor lockout feature. HEAT 70 On the thermostat, slide the Mode Switch to OFF. Slide the Fan Switch to Fan On. The fan should turn on and run continuously (Page 6).
OWNER'S MANUAL T0140 Trouble Shooting 70 SYMPTOM: The slide switches on the thermostat 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. 70 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.
OWNER'S MANUAL T0140 Trouble Shooting HEAT 70 HEAT 70 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 high, the Mode Switch is not set for Heat, the batteries are too weak, or the Aux Heat Switch is set for Emergency.
OWNER'S MANUAL T0140 Warranty One-Year Warranty - This Product is warranted to be free from defects in material and workmanship.
