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As an HVAC safety switch
though chronic tripping usually points to an underlying airflow or combustion issue
it provides superior resistance to corrosion and structural fatigue
meaning both part numbers serve as direct replacements without modification
Hoffman Controls 706-123S Control As an HVAC safety switchThe Hoffman Controls 706 123S is a high performance electronic fan motor speed controller engineered for manual, proportional speed regulation of single phase motors. Specifically designed for Permanent Split Capacitor (PSC) and Shaded Pole motors, this unit provides precise control for direct connected propeller fans or centrifugal blowers. Operating on a multiple voltage range from 120V to 277V, it supports up to a 5A resistive inductive load,