SR208C Solar Water Heater Temperature Differential Controller with Automatic Pump Control and Energy Saving

SR208C Solar Water Heater Temperature Difference Controller Overview A compact controller designed to automate circulation in solar water heating systems by monitoring temperature difference between the solar collector and the storage tank. The SR208C starts and stops the circulation pump based on temperature inputs to ensure heat is transferred when available and to avoid unnecessary pump operation. Key benefits Automates pump control so the system runs only when useful, reducing unnecessary pump runtime and wear. Simple integration with existing solar thermal systems and standard circulation pumps. Clear controls for setting switching differential and delays to match system behavior and prevent short cycling. Compact, panelfriendly design that fits into common installation layouts. Main functions and attributes Function: Monitors temperatures from two sensors and switches the pump on when the collector is sufficiently hotter than the tank, and off when the difference falls below the set threshold. Inputs and outputs: Accepts two temperature sensor inputs and provides a relay output to drive a circulation pump or external control relay. User settings: Adjustable temperature difference and time delay settings to prevent frequent switching and allow fine tuning for specific system conditions. Compatibility: Works with typical solar water heater collectors, storage tanks, circulation pumps, and standard temperature sensors used in solar thermal systems. Size and material: Built in a compact enclosure suitable for wall or panel mounting in equipment cabinets; materials selected for typical indoor installation environments. Performance: Designed for reliable, repeatable switching based on measured temperature difference, with straightforward configuration and visible status indicators. Practical applications Domestic solar hot water: Automate pump operation for a rooftop collector and household storage tank to transfer heat when available. Retrofit projects: Add differential control to existing solar thermal systems that currently rely on manual switching or lack a controller. Small commercial or agricultural setups: Manage circulation for small guesthouses, workshops, or livestock water heating where solar collectors feed a storage tank. What is included 1 piece SR208C temperature difference controller. Installation notes Intended for integration with two temperature sensors positioned at the collector outlet and the storage tank. Ensure the pump and wiring comply with local electrical codes and that a suitable relay or contactor is used when switching larger pump loads. This controller provides straightforward, automatic temperature differential control for a wide range of solar water heating systems, enabling consistent heat transfer while minimizing unnecessary pump operation.