Lux Products TX500U Installation And Operating Instructions Manual page 19

AUTO / ON, FAN MODE SWITCH: When this switch is in AUTO, the blower fan
(if present in your system) will automatically cycle on and off by itself while
heating or cooling is running. When in the ON position, the blower fan will
run constantly with or without a demand for heating or cooling, even when
the System Mode switch is in the OFF position.
NOTE: The Fan Mode switch only works if your system provides a wire for
the thermostat's "G" wire terminal, to control a blower fan. The Fan Mode
switch has no effect in systems that do not have a blower fan (such as a hot
water radiator system).
MULTI-FUNCTION, SET SLIDE SWITCH: This switch provides an easy way to
quickly access the most commonly used thermostat settings. This switch
has 4 individual positions, and unless a specific setting is being adjusted,
this switch should always remain in the RUN position for the thermostat to
control the room temperature. The other Set Slide switch positions are
described in greater detail in the ADVANCED FEATURES section. NOTE: this
switch is only operable when the thermostat is in "Programmable" mode.
When the thermostat is used in "Manual" control mode, all 4 of the switch
positions will act like the RUN position, except the "AIR FILTER" position.
UP / DOWN BUTTONS: The UP and DOWN buttons are used to adjust any
item that can be changed by the user. Examples are the set temperatures,
clock times, and days of the week. In many cases, an item may be flashing if
it can currently be adjusted.
HOLD BUTTON: This button activates and deactivates the manual
Temperature Hold feature.
EMER BUTTON: When in Normal Run mode, the usage of this button varies
depending upon your specific system configuration. For heat pump systems,
pressing this button enables your emergency heat function, which is
described in greater detail in the OPERATING INSTRUCTIONS section. For
conventional systems, there is no such thing as emergency heat, so this
button will have no effect.
NEXT BUTTON: This button is mostly used while setting items such as
software options, and temperature program periods. When there are several
items on the screen that can be changed, usually one of them is flashing
indicating that it can be adjusted. Pressing the NEXT button will cycle
through which item is flashing.
19