Lux Products TX500U Installation And Operating Instructions Manual page 26

heat limit setting. Press the NEXT button to accept the setting. If the code
you tried was not correct, the thermostat will exit and return to the Normal
Run screen with no changes made. If the entered code is correct, the screen
will add the word "SET" and display the current heat set temperature limit.
Use the UP/DOWN buttons to adjust the maximum heat set temperature
value. Press the NEXT button to accept the setting and return to the Normal
Run screen in heat mode.
TO SET THE COOL LIMIT STOP: Place the System Mode switch in the OFF
position, and the Set Slide switch in the RUN position. Press and hold the
DOWN button while sliding the System Mode switch from OFF to COOL. 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
cool limit setting. Press the NEXT button to accept the setting. If the code
you tried was not correct, the thermostat will exit and return to the Normal
Run screen with no changes made. If the entered code is correct, the screen
will add the word "SET" and display the current cool set temperature limit.
Use the UP/DOWN buttons to adjust the minimum cool set temperature
value. Press the NEXT button to accept the setting and return to the Normal
Run screen in cool mode.
TO CHANGE THE TEMPERATURE STOP LOCK CODE: Place the System Mode
switch in the OFF position, and the Set Slide switch in the RUN position.
Press and hold the NEXT button for at least 5 seconds. The words "STOP"
and "LOCK CODE" will appear on the screen, along with two digits. Use the
UP/DOWN buttons to enter the current code ("00" by default) and press the
NEXT button one time. The word "SET" will now be displayed. Use the
UP/DOWN buttons to choose a new 2-digit code between "00" and "99".
Press the NEXT button to accept the setting. The screen will flash briefly to
confirm the code change, and return to the Normal Run screen in Off mode.
IF YOU FORGET YOUR TEMPERATURE STOP CODE: The code can be reset to
the factory default "00" by performing the following steps. Place the System
Mode switch in the OFF position, and the Set Slide switch in the RUN
position. Press and hold the NEXT and HOLD buttons together for at least
10 seconds. The screen will start flashing, and display words "SET", "STOP"
and "LOCK CODE", along with the new code of "00". After a couple seconds,
the screen will automatically return to the Normal Run screen in Off mode.
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