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

meeting original manufacturer standards for peak cooling efficiency

this boiler safety relief valve must be installed in a vertical position with the spindle upright

In high-side or low-side circuits

tool-free head replacement without system drainage

Browning 2AK74H Sheave 318423-701 When power is removed orThe 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