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

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