{"product_id":"mcdonnell-miller-165300-94-hd-head-mechanism","title":"McDonnell \u0026 Miller 165300 94-HD Head Mechanism","description":"\u003cp\u003eThis reliable head mechanism ensures precise low-water cut-off and pump control functionality for industrial steam boilers. Designed for seamless integration, the \u003cstrong\u003e165300\u003c\/strong\u003e \u003cstrong\u003e94-HD\u003c\/strong\u003e head mechanism is engineered to meet the rigorous demands of professional hydronic heating systems, providing immediate response times and long-term durability in pressurized environments.\u003c\/p\u003e\u003cp\u003eThe mechanism functions by utilizing a sensitive float-actuated switch assembly that monitors boiler water levels in real-time. When water levels shift outside of operational parameters, the internal switch triggers the control circuit to safely manage pump activation or burner cutoff, protecting the boiler from dry-firing damage and potential thermal failure.\u003c\/p\u003e\u003ch4\u003eKey System Performance Baselines:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Response:\u003c\/strong\u003e Optimized for accurate liquid level detection in steam applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built with high-grade components to resist corrosion and thermal fatigue.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Compatibility:\u003c\/strong\u003e Specifically engineered to serve as a direct replacement for 94-HD series controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeamless Operation:\u003c\/strong\u003e Facilitates reliable, automated water level management for safer boiler performance.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e⚠️ \u003cstrong\u003eApplication Profile:\u003c\/strong\u003e Recommended for industrial and commercial low-pressure steam boilers requiring precise level monitoring, safety lockout protocols, and automatic feed pump coordination.\u003c\/p\u003e","brand":"McDonnell \u0026 Miller","offers":[{"title":"Default Title","offer_id":43125879439454,"sku":"165300","price":2235.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/165300_image_bd6734e6-96dd-4f0b-ab66-a6408f29af8a.png?v=1786042693","url":"https:\/\/nationalboilersupply.com\/products\/mcdonnell-miller-165300-94-hd-head-mechanism","provider":"National Boiler Supply","version":"1.0","type":"link"}