Technicians should check for continuity across the terminals when the switch is cold

The Marley Engineered Products 3900-0558-000 is an OEM replacement motor designed for continuous air-over applications

Built for compatibility with the Spence T14 temperature pilot and Type E main valves

it maintains precise control within a 0-5 PSI range

For technicians performing retrofits or maintenance on existing Siemens infrastructure

Siemens Building Technology 274-03054 Valve Assembly 318518-761 Technicians should check for continuityThe Siemens Building Technology 274 03054 Valve Assembly is a precision engineered control solution for commercial HVACR hydronic systems. This factory assembled 2 way normally open valve features a 1 2" NPT connection and a 1. 0 Cv rating, optimized for low flow modulation in fan coil units, air handlers, and reheat coils. The bronze body (UNS CA 844) is paired with stainless steel trim and high temperature packing, enabling the assembly to handle