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Precision-formed scroll geometry optimizes transitions from the wheel to the supply plenum for maximum static efficiency
Can this ring be used in other brand assemblies
The internal thermal overload protection prevents winding failure during demanding duty cycles
Its solid-state design ensures high-precision temperature control (50-90°F) for both PTAC units and standard HVAC configurations
Caleffi ZVR103 Relay 322838-753 Precision-formed scroll geometry optimizes transitionsThe Caleffi ZVR103 is a high performance 3 zone valve relay designed for professional contractors managing multi zone hydronic heating systems. Engineered for seamless integration, the ZVR103 serves as a direct technical replacement for the HPZC103, providing a robust interface between low voltage 2, 3, and 4 wire thermostats and boiler equipment. This hydronic zone valve controller features a standard 40 VA transformer, which is field expandable to
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