TH146-N-U
User’s Guide
Non-programmable H/C Controller
TH146-N-U
9/12
Press the
Mode
button to place the system in one of the following
modes:
Press the
button to select the fan operating mode.
•
In automatic mode, the fan runs only when heating or cooling is
activated.
NOTE
: For gas-operated HVAC systems, there might
be a delay before the fan starts or stops when heating is acti-
vated or deactivated.
•
In continuous mode, the fan runs continuously and the sym-
bol is displayed.
NOTE
: If Smart Fan is enabled, when the ther-
mostat is in unoccupied mode, the fan runs only when heating
or cooling is activated.
The controller can display either the indoor humidity level or the out-
door temperature (see page 8, item 14).
The actual (measured) indoor temperature is normally displayed. To
view the setpoint temperature, press one of the
buttons once.
The setpoint is displayed for 5 seconds and is indicated by the
symbol.
To modify the temperature setpoint, press one of the
buttons
until the desired temperature is displayed.
NOTE
: If the controller is in automatic heat/cool changeover (see
section 5.1), the setpoint is automatically reduced or raised by 1°C
(1.8°F) when the controller switches to heating mode or to cooling
mode respectively. For example, if the setpoint is 24°C (75°F) in
heating mode, it will become 25°C (77°F) in cooling mode and will
return to 24°C (75°F) when the controller switches back to heating
mode.
NOTE
: Skip this section if you do not have a humidifier connected to
the controller.
The humidity level can be set manually or automatically (see
page 8, item 16).
System fault
indicator
Temperature adjustment
Fan operating
mode selection
System operating
mode selection
System operating mode
Fan is in
continuous mode
Unoccupied
mode is On
Outdoor temperature
or indoor humidity
Indoor temperature
Auxiliary heat is On
Heating is On
Cooling is On
Emergency heat
indicator
Dual energy
Humidifier
is On
Appears when the
temperature setpoint
is displayed
5. Operation
5.1
System Operating Mode
HEAT
The system is in heating mode.
COOL
The system is in cooling mode.
AUTO
The system is in automatic changeover mode. (The
system switches between heating mode and cooling
mode to maintain the desired temperature.)
OFF
The system is off.
EHEAT
The system is in emergency heat mode. Only auxiliary
heating is used when there is a call for heat. (This
mode applies only when the controller is connected to
a heat pump equipped with auxiliary heating).
5.2
Fan Operating Mode
5.3
Indoor Humidity / Outdoor Temperature Display
5.4
Temperature Setting
5.5
Humidity Setting
Outdoor
temperature
Indoor
humidity
Summary of Contents for TH146-N-U
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