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Hvac Pro
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Doesn't sound like your installer is too familiar with them. A true 2 stage thermostat will send an extra signal down the Y2 wire to initiate the second stage. A knowledgeable tech can test that at the outdoor unit with a meter. As it is new and under warranty he should make it work and have it wired properly also. There may also be a programming code/setting in the thermostat for it to be used as a 2 stage. By default most are set for 1 stage. Read the installation manual for more info.

Good Luck
 
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