Venstar T0140 User Manual
residential
THERMOSTAT
Digital
Digital
Thermostat
Thermostat
NON-
NON-
PROGRAMMABLE
PROGRAMMABLE
up to
up to
& 1-cool
& 1-cool
HEAT
HEAT
PUMP
PUMP
Stages: 2-Heat, 1-Cool
Battery or System Powered
Auxiliary Heat Indicator
Fahrenheit or Celsius
Bi-Color LED (when system powered)
T0140
2-heat
2-heat
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
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
Safety Warnings
T0140
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. 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.
Page 3
OWNER'S MANUAL
Front Panel
T0140
DISPLAY
70
FAN SWITCH
On or Auto
MODE SWITCH
Cool, Off or Heat
AUX HEAT
SWITCH
Emergency
Normal
Lockout
COOLER &
WA R M E R
BUTTONS
BI-COLOR LED
Heat or Cool demand
indicator when system
powered: Red = Heat
Green = Cool
BATTERY
DOOR
Page 4
OWNER'S MANUAL
SET TEMP
AUX
HEAT
COOL
T0140
Display
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.
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.
Indicates battery life is low; it is recommended to
replace the batteries at this time.
Indicates auxiliary heat is energized.
88
Page 5
OWNER'S MANUAL
Normal Operation
HEAT
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.
T0140
MODE SWITCH
Cool, Off or Heat
COOLER &
WA R M E R
BUTTONS
Page 6
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.
Page 7
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