Refrigerant # Cntrl

a 3/16-inch fitting is standard for 1/4-inch tubing connections

Precise Overpressure Protection: Factory calibrated at 30 PSI for accurate system relief

use the Red and Blue terminals

Zonefirst AOBD-20X8 Damper R-410A Refrigerant # CntrlThe Zonefirst AOBD 20X8 is a high performance automatic opposed blade damper designed for precision airflow management in commercial and residential HVAC zoning. This 20" x 8" unit features a robust 24Vac power open power closed actuator, requiring a 3 wire connection for positive drive control in both directions. Unlike standard gravity or spring return models, the AOBD 20X8 side mount damper utilizes a synchronous motor that draws power only during