Spence Engineering D550 Pilot Els PW 29614 This part number typically refers

This part number typically refers to the controller itself

This differential pressure switch is built for the rugged environment of a boiler cabinet and is rated for altitudes from 0' to 1999'

This unit features a robust steel frame equipped with high-grade nickel-chromium resistive heating coils

and a retainer

The housing includes molded terminal numbers and a circuit diagram on top for rapid wiring identification and diagnostic troubleshooting

Spence Engineering D550 Pilot Els PW 29614 This part number typically refersThe Spence Engineering D550 Pilot is a heavy duty, spring operated pressure pilot designed to interface with Type E and Type C main valves for high accuracy steam regulation. Constructed with a rugged cast iron body, this normally closed pilot is specifically engineered for secondary pressure control in steam heating systems and industrial vapor applications. It features a 5 50 PSI spring range, allowing contractors to field adjust delivery setpoints