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SAFETY FEATURES
AC Power Monitor
■ This thermostat operates on 24V AC, which is provided by your system’s transformer. If
the system loses electricity, then the 24V AC power is lost also.
■ The 2 AAA batteries provide backup operation of the clock, as well as all programs
and settings.
■ If the AC power is lost, then the LCD display will alternate “No AC Pwr” with the day.
■ Without AC power, the following functions are disabled:
- The system is turned off.
- The Backlight function is disabled.
- The remote sensor temperature readings are not available.
No AC Pwr
PM
System Fan
Te mp
3
Low Batt
PM
System Fan
Te mp
3
Low Battery Warning
Your thermostat has a low battery warning system. When the
batteries are detected to be weak, the low battery warning is