Belimo CQKB24-RR Actuator 328140-751 The 621679R is a 4-pole

The 621679R is a 4-pole sequencer designed for specific multi-stage element banks

The Robertshaw 700 series is recognized for its multi-position mounting flexibility—horizontal

this unit is the direct manufacturer-specified replacement for both the VFD66EBA-1 and VFD66EBA-2

requiring a physical inspection of the combustion blower and heat exchanger integrity before the system can be restored to operation

Stable Flame Production: Optimized natural gas flow regulation provides a consistent flame for reliable ignition

Belimo CQKB24-RR Actuator 328140-751 The 621679R is a 4-poleFor contractors demanding reliable zone control, the Belimo CQKB24 RR Actuator delivers robust performance. This 24V electronic fail safe actuator is engineered for precise on off control in HVAC applications, specifically designed for direct mounting on Belimo ZoneTight ball valves without requiring additional linkage or specialized tools. Operating on AC DC 24 V, it features a low power consumption of 2. 5 W running and 0. 5 W in rest position,