The Hoffman Controls 880-20 is a high-performance low ambient head pressure control engineered specifically for modulating energy-efficient EC motors in air conditioning and refrigeration systems. This ECM motor controller utilizes a 10K liquid line temperature sensor to monitor sub-cooled refrigerant temperatures, allowing for precision condenser fan speed regulation without the need for system penetration or refrigerant-specific configurations. By varying the air volume through the condenser, the 880-20 effectively regulates head pressure to maintain the required pressure differential at the expansion valve, ensuring stable HVAC system performance even in extreme environmental conditions. The controller features a 20mA drive capability, typically sufficient for managing two ECM condenser fan motors simultaneously, and includes a 2.5-second full-speed hard start to ensure reliable motor seating in cold starts. Designed for professional-grade reliability, the unit is conformally coated for protection against moisture and condensation within weatherproof enclosures. It offers flexible motor drive options, including jumper-selectable 0-10VDC or 10-0VDC (fail-safe) signals and a 13-17VDC, 80Hz PWM control signal. Technicians can easily field-tune the system via adjustable low and high set points, with a modulation range typically spanning between 50°F and 80°F liquid line temperatures. The inclusion of a self-test mode and LED set point indication simplifies HVAC system diagnostics during installation or routine maintenance, making it an essential component for ventilation system repair and service upgrades in commercial refrigeration and computer room cooling applications. Key Benefits: Dual sensor inputs allow for monitoring two refrigerant circuits, with the hottest sensor automatically taking control. Broad compatibility with PWM and 0-10VDC/10-0VDC signals for versatile integration with major ECM manufacturers. Non-invasive installation uses a 10K Ohm thermistor on the liquid line, eliminating the risk of refrigerant leaks. Adjustable set points ranging from 40°F to 140°F allow for precise tuning of the condenser fan speed control. 2.5s Hard Start feature provides the necessary torque to prevent motor stalling in low-temperature environments. Common Questions: How many motors can the 880-20 drive? This model features a 20mA output, which is generally capable of driving up to two standard ECM motors. Does the 880-20 require a specific refrigerant? No, because it senses liquid line temperature rather than pressure, it is refrigerant independent and compatible with all types. What is the purpose of the 10-0VDC mode? This is a fail-safe configuration where the motor defaults to maximum speed if the control signal is lost, preventing system overheating. 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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