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this module regulates the timing of the circulator pump relay and the combustion air blower
the RLY3697 provides the reliable mechanical switching needed to restore OEM-spec performance and protect downstream electronics from voltage spikes
Corrosion Resistance: Utilizes rust-resistant nickel-chromium heating coils for extended operational life in high-airflow environments
Key Benefits Increased Horsepower Capacity: The 358 series design delivers more power in less space than conventional oversized belts
Siemens DDC R540-110 Control Freon this module regulates the timingThe Siemens DDC R540 110 Control is a dedicated Terminal Equipment Controller (TEC) designed for localized management of fan coil units, unit ventilators, and heat pumps. This refurbished unit offers field proven direct digital control, providing stable temperature regulation and energy management within a Siemens APOGEE or TALON network. Built with preprogrammed control algorithms, the R540 110 streamlines HVAC automation by reducing the need for
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