In high-side or low-side circuits

this genuine source 1 part provides the precise voltage regulation required for consistent furnace troubleshooting and system longevity

Tamper-Resistant Design: The no-display window and lack of external adjustment knobs prevent unauthorized setpoint changes in high-traffic areas

When power is removed or interrupted by the thermostat or zone panel

Browning 2AK74H Sheave 318423-701 In high-side or low-side circuitsThe Browning 2AK74H Sheave is a precision engineered 7. 25" outside diameter drive component designed for dual groove power transmission systems. Manufactured from high grade ASTM A48 Class 30 gray cast iron, this double groove sheave provides the structural rigidity required to manage belt tension and minimize vibration in demanding HVACR blower and motor applications. Engineered for maximum versatility, it is compatible with 3L, 4L, and A section v