Lux Products TX500U Installation And Operating Instructions Manual page 25

TEMPERATURE CALIBRATION: The internal temperature sensor in this
thermostat is accurately calibrated at the factory, and in most cases
alterations to this setting should not be needed. The Temperature
Calibration feature allows you to manually offset the measured temperature
by as much as plus or minus 5°F (3°C) degrees from its original value. This
feature can be useful to match or synchronize this thermostat to another one
or more, if multiple thermostats are used in the same home.
NOTE: The Temperature Calibration setting need to be performed in a timely
manner, as the thermostat will timeout and automatically exit the adjustment
screen after approximately 10 seconds without a button press.
TO CHANGE THE TEMPERATURE CALIBRATION: Ensure that the System Mode
switch is in the OFF position and the Set Slide switch is in the RUN position.
Press and hold both the UP and DOWN buttons together for at least 5
seconds. The words "SET" and "CAL" will appear on the screen, along with a
single flashing temperature digit. Use the UP/DOWN buttons to change the
number of degrees of adjustment. 0° degrees is the default value, and
means no correction is being applied. Press the NEXT button to accept the
setting.
TEMPERATURE LIMIT STOPS: There are two independent set temperature
limit stops: a maximum heat set temperature, and a minimum cool set
temperature. These stops do not prevent a user from performing normal
actions like Temperature Override or Hold. The Heat Limit Stop prevents the
set temperature from being adjusted higher than the heat limit setting. The
Cool Limit Stop prevents the set temperature from being adjusted lower than
the cool limit setting. Each of these temperature stops is user adjustable in
one-degree increments, and these settings are protected by a selectable 2-
digit code to prevent unauthorized tampering. By default, this 2-digit code is
"00", and the temperature stops can be used as-is with this code.
NOTE: The Temperature Limit Stop settings need to be performed in a timely
manner, as the thermostat will timeout and automatically exit the setting
screens after approximately 10 seconds without a button press.
TO SET THE HEAT LIMIT STOP: Place the System Mode switch in the OFF
position, and the Set Slide switch in the RUN position. Press and hold the
UP button while sliding the System Mode switch from OFF to HEAT. The
words "STOP" and "LOCK CODE" will appear on the screen, along with two
digits. Use the UP/DOWN buttons to select the proper code to access the
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