The International Environmental 71520318 is a high-performance digital non-programmable fan coil thermostat engineered for precise climate control in commercial and residential 2-pipe and 4-pipe hydronic systems. As the direct replacement for 71520304, this unit offers a seamless retrofit for technicians servicing legacy IEC fan coil units. Operating on 24VAC low voltage, it features 3-speed fan control capabilities (Low, Medium, High) and auto-changeover functionality to maintain tight setpoint tolerances without manual intervention. Built with a large LCD display and a "No Logo" VenStar faceplate, the 71520318 prioritizes functional clarity and durability. The solid-state sensor ensures 1-degree accuracy, while the non-volatile memory preserves all installer configurations during power interruptions. This thermostat is compatible with auxiliary sensors for unoccupied mode via dry contact, making it a reliable solution for energy-efficient zone management in hospitality and multi-family applications. Key Benefits: Universal Compatibility: Supports both 2-pipe and 4-pipe fan coil configurations with adjustable deadbands. Enhanced System Reliability: OEM 71520318 digital thermostat provides stable communication with relay boards to prevent short-cycling. Technician-Friendly Setup: Features a locking keypad to prevent unauthorized setpoint tampering in public spaces. Flexible Installation: Designed for wall or unit mounting; fits standard junction boxes when used with an optional mounting plate. Precision Control: Fahrenheit or Celsius display options with a soft-glow backlight for high visibility in low-light utility areas. Common Questions: Is the 71520318 a direct fit for the older 71520304 model? Yes, the 71520318 is the official replacement for 71520304. It utilizes the same wiring footprint for low voltage fan coil control, ensuring a fast swap-out during service calls. Does this unit require batteries for memory retention? No, this IEC fan coil thermostat is hardwired for 24V power and uses internal memory to save settings indefinitely, eliminating the need for battery replacements. Can I use this thermostat to control 3-speed fans? Yes, it is designed specifically for 3-speed fan operation. The technician can configure the fan to run continuously or only during heating and cooling cycles through the advanced setup menu. Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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