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Mode of Operation
The SC2811 is a three-stage heat, two-stage cool thermostat. It functions with air conditioning, heat pumps,
gas, oil or electric heat.
The thermostat activates the first stage heat when the room temperature is below the heat set
temperature (by the differential temperature). Second stage heat will be activated if the room temperature
continues to drop. Third stage heat is activated (on some systems) if the room temperature drops further.
The heat outputs are staged off (configurable, setting 10, Page 24) as the room temperature increases. For
heat pump systems, the thermostat will not let the compressor come on for five minutes after it turns off.
This protects your compressor.
When the room temperature is greater than the cool set temperature (by the differential temperature),
the cooling device is activated. Second stage cool will be activated if the room temperature continues to
rise. The cool outputs are staged off (configurable, setting 10, Page 24) as the room temperature drops.
The thermostat will not let the compressor come on for five minutes after it turns off. This protects your
compressor.
The SC2811 has the following operating modes: OFF, Heat, Emergency Heat, Cool and Auto. In OFF mode,
the thermostat will not turn on heating or cooling devices. In the Heat mode, the thermostat controls the
heating system. For heat pump systems, Emergency Heat mode is used to bypass the compressor (only
backup heat operates). In the Cool mode, the thermostat controls the cooling system. In the Auto mode, the
thermostat operates as an auto changeover thermostat. It will turn on heating or cooling as required. The
indoor fan can be turned on in all operating modes using the Fan switch.
The SC2811 has an air filter check option also. When the fan run time exceeds the time set in the
configuration (step 15, page 25), the filter reminder will be displayed. To reset the filter counter to zero
and clear the filter reminder from the display, press the and buttons in simultaneously for 5 seconds.
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