Community theater safety
We ordered this unit as a direct replacement for a smoke detector in the return air duct of our second floor HVAC system. We felt it was a vital part of our safety program in case of fire since our community theater auditorium is on the second floor of a 100+ year old building. We couldn't get the unit to work until we called in an electrical engineer. He determined the unit would not work with the 24v supply from the main HVAC equipment, but would work with a separate 120v supply line. It was easier and quicker for us to run a new 120v line rather than return this unit and start all over again.
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