EMERGENCY HEAT (Heat Pump Configuration Only)
While in normal Heat mode with the rotary dial in the RUN position, one single press of the COPY/EMER button will activate Emergency Heat mode. A single press again will end Emergency Heat mode, and return back to normal Heat mode. While in Emergency Heat mode, the word “EMER” will be shown in the temperature portion of the display screen. If a power loss occurs while in Emergency Heat mode, the thermostat will continue to remain in Emergency Heat mode even after the power comes back on.
Emergency Heat mode will prevent the first stage of your heat pump system from turning on, and use only the “W2” second stage heat terminal (Auxiliary Heat) as the primary heating source. It may become too cold in some climates for a heat pump alone to provide adequate heating without a secondary heating device. As every heat pump has different operating characteristics, you should refer to your heat pump manufacturer's recommendations for when to disable the heat pump and run in Emergency Heat mode.
NOTE:
This special Emergency Heat mode of operation only exists if your System Mode hardware option is set to the HP (Heat Pump) setting.
DISPLAY BACKLIGHT
Any button press will illuminate the display screen for about 12 seconds, even if the Keypad Lock is activated. Any button press, mode switch change, or dial change while the backlight is already illuminated, will reset the initial 12 second timeout.
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