the 93-HDLS utilizes a robust mechanical float-operated mechanism to provide reliable boiler pump control and essential low-water protection

technicians should use anti-static protection and verify all terminal connections are secure and free of oxidation before powering the system

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This manual-handle valve is built to survive the rigors of field service

Caleffi ZVR104 Relay 319852-301 the 93-HDLS utilizes a robustThe Caleffi ZVR104 is a professional grade 4 zone valve relay designed for precise control of hydronic heating systems. Serving as a direct HPZC104 replacement, this multi zone controller manages up to four zone valves and features priority zoning functionality, allowing a single zone to be designated for domestic hot water (DHW) production. Engineered with a multi pin selectable priority option, the ZVR104 ensures that space heating loads are