The Johnson Controls P66AAB-1 is a precision-engineered Electronic Fan Speed Control designed to deliver reliable, energy-efficient condenser fan modulation in commercial and light industrial HVAC refrigeration systems. By continuously monitoring system pressure through a single input sensor, the P66AAB-1 automatically adjusts fan motor speed to maintain optimal head pressure — protecting compressors, improving system efficiency, and extending equipment life.
Key Features
- Electronic fan speed control with single input pressure sensor for simplified wiring and installation
- 190–250 Psig operating pressure range for precise head pressure management across a wide range of refrigerants and ambient conditions
- 60″ capillary tube provides flexible sensor placement for remote or hard-to-reach pressure tap locations
- Start voltage set at 10% of supply voltage, enabling smooth, low-inrush motor starts that reduce mechanical stress and extend motor life
- Modulates condenser fan speed in response to refrigerant pressure changes, preventing short-cycling and unnecessary energy consumption
- Compact, field-ready design from Johnson Controls — a trusted name in HVAC controls and building automation
Specifications
- Model: P66AAB-1
- Brand: Johnson Controls
- Control Type: Electronic Fan Speed Control
- Input Sensor: Single
- Operating Pressure Range: 190–250 Psig
- Capillary Length: 60″
- Start Voltage: 10% of Supply Voltage
Applications
- Commercial refrigeration condensing units
- Air-cooled chillers and packaged HVAC equipment
- Rooftop units requiring head pressure control
- Any system requiring condenser fan speed modulation based on refrigerant pressure
