Operation in Heat Mode
When the outdoor temperature is below the
Compressor Lockout Temperature, only the
Auxiliary Heat operates.
When the outdoor temperature is above the
Auxiliary Lockout Temperature, only the
Compressor operates. See Fig. 33.
Operation in Emergency Heat Mode
Once the thermostat is placed into the
Emergency Heat mode, the compressor
and auxiliary lockout features are turned
off. In the Emergency heat mode, the
compressor is locked out. The first stage of
heat is whatever is connected to the E
terminal. The second stage of heat is
connected to the Aux. terminal. Usually the
emergency and auxiliary heat sources are
electric strip heat in these cases.
Operating Sequence
The thermostat energizes specific
terminal(s), depending on the demand for
heating, cooling or fan. The thermostat
screen shows the time, inside temperature,
system and fan selections. Additional
indicators are shown when the heating,
cooling or fan is energized. See Tables 7 - 9
for specification information.
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