OTHER FUNCTIONS AND CONTROLS
Backlight
The backlight of the RT500 is switched on automatically whenever any of
the keys are pressed. The backlight will remain illuminated for
approximately 5 seconds after the last key press, except if you are
changing the set point temperature – in this case, the backlight will
remain illuminated throughout the setting change process.
The backlight will not illuminate if the RT500 battery is low.
Battery Status
The RT500 checks the battery voltage frequently during normal
operation. If the battery voltage is sensed as being low (this is normally
when the battery voltage falls to a level of around 2.6V), the low battery
indicator will be displayed on the screen.
Although the programmable thermostat will continue to operate
normally at this stage, you should replace the batteries as soon as possible
to prevent any possible operating problems.
Reset Button
The Reset Button is provided as a way to restore the programmable
thermostat to its default factory settings. Pressing this button will
delete any previously entered settings.
RT500 INSTRUCTION MANUAL
18
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