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Industrial-Grade Built: High-quality materials resist housing cracks and contact pitting for consistent electrical performance
Durable Construction: Oval run capacitor housing is corrosion-resistant for long-term reliability in outdoor condensers
for DC applications
the switch is calibrated to open at 150°F to prevent heat exchanger damage and close at 120°F once safe operating temperatures are restored
it provides the mechanical longevity required for high-cycle applications
McDonnell & Miller 304400 Cover Industrial-Grade Built: High-quality materials resistThe McDonnell & Miller 304400 is a genuine replacement flow switch cover (Model FS4 3COV) engineered specifically for Xylem FS4 3 liquid flow switches and the AF 1, AF 2, and AF 3 airflow switch series. In demanding commercial boiler and process piping environments, maintaining the integrity of the switch housing is critical for protecting the single pole, double throw (SPDT) snap switch and internal sensitivity adjustments from dust, moisture, and
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