165300 Model 94-HD McDonnell & Miller Head Mechanism

The McDonnell & Miller #94-HD Head MECHANISM McDonnell & Miller 165300 (Model 94-HD) Heavy-Duty Head Mechanism — Reliable Boiler & Hydronic Control Component The McDonnell & Miller 165300 — also known as Model 94-HD head mechanism — is a premium industrial-grade control component designed to deliver dependable performance in high-duty boiler and hydronic systems. This robust head mechanism provides precise pressure or temperature actuation when paired with compatible switches or control bodies, ensuring accurate system control and long-term reliability. Manufactured to withstand rigorous operating conditions found in commercial boilers, steam systems, and high-pressure hydraulic loops, the 94-HD head mechanism is a trusted choice among HVAC and mechanical professionals seeking OEM-quality performance and durability. Whether you are servicing existing equipment or specifying new installations, this head mechanism delivers consistent actuation for safety and operational controls. Features • McDonnell & Miller 165300 (Model 94-HD) head mechanism• Heavy-duty construction for extended service life• Precision actuation for pressure or temperature control systems• Designed to work with McDonnell & Miller switch bodies and control assemblies• Engineered for commercial, industrial, and institutional boiler applications• Rugged materials and mechanics for harsh operating environments Benefits & Applications • Provides reliable actuation for safety and system control functions• Heavy-duty design increases uptime and reduces maintenance frequency• Ideal for commercial boilers, steam and hydronic heating systems, and industrial process controls• Trusted OEM component for replacement and retrofit applications• Helps maintain consistent control response to pressure/temperature changes• Attractive solution for contractors, facilities managers, and service technicians Technical Specifications Specification Value / Description Model / Part Number 165300 Alternate Model Name 94-HD head mechanism Brand McDonnell & Miller Product Type Control head / actuation mechanism Typical Use Boiler pressure/temperature actuation, hydronic control systems Application Area Commercial/industrial HVAC, steam systems, boiler controls Construction Heavy-duty mechanical head with precision actuation Compatibility Works with compatible McDonnell & Miller control bodies/switches Applications • Commercial and institutional boiler pressure/temperature control• High-duty hydronic heating systems• Steam system safety and control mechanisms• Industrial mechanical systems requiring robust actuation components• Retrofits of older or worn control heads on compatible switch assemblies Always verify compatibility with your existing McDonnell & Miller switch or controller before purchasing. Installation & Use Notes • Installation should be performed by qualified HVAC, plumbing, or mechanical control professionals• Ensure the head mechanism is correctly seated and aligned with the switch or control body• Follow manufacturer torque and assembly recommendations for proper engagement• Verify actuation range and adjustment settings during commissioning• Test system operation after installation to confirm reliable actuation and control response Why Buy from APEX Controls • OEM McDonnell & Miller head mechanism — no aftermarket or generic substitutes• Durable, long-lasting component designed for heavy-duty service environments• Trusted choice for contractors, service technicians, and maintenance teams• Suitable for replacement or retrofit applications in commercial and industrial systems• Reliable performance for pressure and temperature control actuation