Venstar T0140 User manual
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
NON-
PROGRAMMABLE
NON-
up to
& 1-cool
up to
& 1-cool
2-heat
2-heat
HEAT
PUMP
HEAT
PUMP
Bi-Color LED (when system powered)
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
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 proper
operation. The “Low Battery” icon will appear on the
thermostat display when it is time to replace the
batteries. If the thermostat is connected to 24v power,
the batteries should still be installed, but are not
required.
When “Low Battery” is displayed the batteries must be
replaced immediately. The manufacturer cannot be
liable for improper operation of the thermostat if the
batteries are not immediately replaced.
Annual battery replacement is especially critical in
locations subject to freezing temperatures. The
thermostat will be unable to turn on the heating system
if the batteries are exhausted.
P/N T0140
OWNER'S MANUAL
T0140
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
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 numbers to switch from the current
room temperature to the desired set temperature.
Current room or set temperature.
Indicates battery life is low; it is recommended to
replace the batteries at this time.
OWNER'S MANUAL
T0140
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).
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 or WARMER buttons.
OWNER'S MANUAL
T0140
On or Auto
FAN SWITCH
COOLER &
WA R M E R
BUTTONS
MODE SWITCH
Cool, Off or 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 cooling operation.
*
AUX HEAT
SWITCH
OWNER'S MANUAL
T0140
Emergency - Disables all compressor
functions* and energizes only Aux
Heat to satisfy the heat demand.
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 R M E R
BUTTONS
MODE SWITCH
Cool, Off or Heat
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, call a qualified
technician for assistance.
Preparation
Make sure your Heat Pump is working
properly before beginning installation
of the thermostat.
OWNER'S MANUAL
T0140
Turn off the power to the Heat Pump
system at the main fuse panel.
70
HEAT
70
HEAT
70
HEAT
70
HEAT
70
HEAT
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.
Remove & Replace
Old Thermostat
Page 10
OWNER'S MANUAL
T0140
70
HEAT
70
HEAT
70
HEAT
70
HEAT
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