Operating at 240VAC 60Hz (or 220VAC 50Hz)

while the 21V51U-843 is formulated for ECM variable-speed motors

The unit includes a standard 3/16" x 3/32" keyway for secure shaft mounting

Always check the service manual for your specific serial number to confirm the correct thermistor lead length and connector type

Resideo VCZMR6100 Valve R-407A Operating at 240VAC 60Hz (orThe Resideo VCZMR6100 is an industrial grade 1" NPT three way cartridge cage valve engineered for precise control in hydronic systems. Designed with a bronze body and a stainless steel stem, this mixing diverting valve handles chilled or hot water applications with up to 60% glycol concentration. The stem up to close A port configuration ensures reliable flow management, while the 8. 3 Cv rating provides sufficient capacity for commercial fan coil and