Proven Reliability: The ZR48K5E frame is a field-tested standard for commercial HVAC systems

Enhanced Thermal Protection: Integrated internal sensors prevent motor burnout by cutting power during excessive heat buildup

it efficiently converts 115VAC 60Hz line voltage into a stable 24 volt AC output at 8 Amps

or a humming sound indicating a bad HVAC capacitor or seized bearings

Whether you are servicing commercial HVAC equipment or upgrading a power distribution panel

Lochinvar & A.O. Smith 100173747 Control 318423-701 Proven Reliability: The ZR48K5E frameThe Lochinvar & A. O. Smith 100173747 Control is a critical safety component designed for high performance hydronic systems and commercial water heaters. This low water cut off with manual reset (LWCO) serves as a fail safe mechanism, monitoring internal water levels to prevent dry firing. Engineered specifically for Lochinvar boiler systems and A. O. Smith commercial units, the 100173747 ensures the burner circuit is interrupted immediately if a low