McDonnell & Miller FS7-4D Boiler Control Unit

The McDonnell & Miller FS7-4D is a reliable boiler control unit featuring two SPDT switches, built to handle demanding industrial environments. The FS7-4D (119750) delivers precise signaling for burner, safety, or fault alerts, helping improve system safety and energy efficiency in commercial boiler setups. Designed for easy installation, this unit integrates with standard control panels and wiring harnesses, offering dependable performance across extended duty cycles.

The compact, rugged design stands up to high temperatures and harsh conditions, ensuring long service life and simple maintenance. This replacement part is a practical upgrade for legacy systems and new installations alike, providing flexible control options without rewiring.

• Two SPDT switches for flexible control and independent alarm signaling
• Durable, industrial-grade construction designed for boiler environments
• Easy wiring with standard control panels and quick-install terminals
• Compact, space-saving form factor ideal for tight installations
• Part number 119750 included for easy ordering and fast replacement

Upgrade your boiler system with the McDonnell & Miller FS7-4D to ensure reliable operation and straightforward maintenance.