Overview
The Johnson Controls P66AAB-1C is a refrigerant pressure-actuated electronic fan speed control designed for single-phase permanent split-capacitor motors in HVAC/R systems. It provides condenser pressure control by directly sensing refrigerant pressure and adjusting fan motor speed, serving as a reliable alternative to traditional fan cycling.
Features
- Built-in pressure transducer for rapid response to condenser pressure changes
- Soft start capability to reduce startup noise and abrupt speed shifts
- Integrated voltage surge protection and radio frequency interference suppression
Specifications
- Operating Range: 190 to 250 psig
- Start Voltage: 10% of line voltage
- Capillary Length: 60 inches
- Control Voltage: 24 VAC, Class 2
- Ambient Temperature Range: -40 to 54 degrees Celsius
Applications
- Commercial air conditioning and refrigeration systems
- Computer room environmental control units
- Condenser fan motor speed regulation replacing fan cycling controls


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