For multi-stage heating

always verify the specific pinout and wire gauge requirements in the technical data sheet

allowing technicians to set exact switching points for sensitive burner and HVAC applications

providing the necessary phase shift for single-phase motor efficiency

The 193D model features alternate tappings

Belimo EXT-OP-5502-250 Sensor R-22 For multi-stage heatingThe Belimo EXT OP 5502 250 is a precision engineered Carbon Monoxide (CO) sensor designed for demanding commercial HVAC applications, specifically targeted at indoor air quality (IAQ) monitoring in parking garages and mechanical spaces. This duct mounted CO sensor utilizes an advanced electrochemical sensing element to provide high accuracy ppm readings, ensuring reliable integration with Building Automation Systems (BAS) via a standard 2 10V or 4