Precision Metering: Size 00 bore provides exact mass flow rates required for low-capacity refrigeration and AC applications

it is not interchangeable with 2-wire models like the F19-0104

specifically within Aaon rooftop units and chillers

providing a fail-safe readout during power cycles

Dwyer Instruments AAFS Switch Refrigerant Precision Metering: Size 00 boreThe Dwyer Instruments AAFS Adjustable Air Flow Paddle Switch is a heavy duty sensing solution engineered to monitor and verify air flow velocity in HVAC and industrial ductwork. Designed to handle air and compatible gases, this unit features a field adjustable SPDT switch, allowing for precise setpoint selection between 200 to 1800 FPM. As the direct replacement for F40AA 2, it offers a drop in upgrade for legacy systems requiring reliable proof of