McDonnell & Miller 354001 Switch
The McDonnell & Miller 354001 is a professional-grade E-11M 24V 2-SPST M/R Switch engineered for critical low water cut-off (LWCO) applications in residential and commercial boiler systems. This manual reset switch (M/R) provides high-reliability safety by latching open during a low water condition, requiring a technician to physically depress the reset button only after the proper water level has been restored. Built for durability in demanding mechanical rooms, the 354001 replacement switch features dual single-pole, single-throw (SPST) contacts, allowing for simultaneous control of the burner circuit and an auxiliary alarm or low water signal. It is specifically designed as a drop-in HVAC manual reset control for McDonnell & Miller Series 67, 61, 64, 69, 764, and 767 low water cut-offs. The 24VAC configuration is ideal for modern low-voltage control strings, ensuring seamless integration with existing 24V burner circuits and secondary safety limits.
Key Benefits for Technicians- System Safety: Manual reset functionality prevents automatic boiler cycling in dangerous dry-fire conditions, ensuring the root cause of water loss is addressed.
- Broad Compatibility: Direct replacement for the legacy 11M and 309151 models across multiple LWCO series.
- Internal Redundancy: Features dual SPST switches to manage both the primary burner safety circuit and an external alarm.
- Precision Engineering: Rated for a maximum boiler pressure of 20 psi, making it a standard choice for low-pressure steam and hot water systems.
- Reliable Switching: Snap-action contacts ensure crisp, dependable operation even in high-temperature environments near the boiler vessel.
Can the E-11M 24V switch be used to control an electric water feeder?
No, terminal 4 on the E-11M is intended for alarm or signal use only and is not rated to power an electric water feeder directly. A standard #11 switch should be used for feeder applications.
What is the difference between the 11-M and the 11-MV switches?
While both are manual reset, the 11-M (354001) is designed for 24V or 120V pilot duty (depending on the specific model wiring), whereas the 11-MV is specifically tailored for millivolt gas valve systems or 24V burners with special contact requirements.
How do I verify the switch is properly set during installation?
Ensure the "TOP" indicator on the switch is oriented correctly and the U-shaped notch aligns with the float mechanism roller. The switch housing can be rotated, but the 11M reset button orientation must remain vertical for proper mechanical latching.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
Original: $410.90
-65%$410.90
$143.81McDonnell & Miller 354001 Switch
The McDonnell & Miller 354001 is a professional-grade E-11M 24V 2-SPST M/R Switch engineered for critical low water cut-off (LWCO) applications in residential and commercial boiler systems. This manual reset switch (M/R) provides high-reliability safety by latching open during a low water condition, requiring a technician to physically depress the reset button only after the proper water level has been restored. Built for durability in demanding mechanical rooms, the 354001 replacement switch features dual single-pole, single-throw (SPST) contacts, allowing for simultaneous control of the burner circuit and an auxiliary alarm or low water signal. It is specifically designed as a drop-in HVAC manual reset control for McDonnell & Miller Series 67, 61, 64, 69, 764, and 767 low water cut-offs. The 24VAC configuration is ideal for modern low-voltage control strings, ensuring seamless integration with existing 24V burner circuits and secondary safety limits.
Key Benefits for Technicians- System Safety: Manual reset functionality prevents automatic boiler cycling in dangerous dry-fire conditions, ensuring the root cause of water loss is addressed.
- Broad Compatibility: Direct replacement for the legacy 11M and 309151 models across multiple LWCO series.
- Internal Redundancy: Features dual SPST switches to manage both the primary burner safety circuit and an external alarm.
- Precision Engineering: Rated for a maximum boiler pressure of 20 psi, making it a standard choice for low-pressure steam and hot water systems.
- Reliable Switching: Snap-action contacts ensure crisp, dependable operation even in high-temperature environments near the boiler vessel.
Can the E-11M 24V switch be used to control an electric water feeder?
No, terminal 4 on the E-11M is intended for alarm or signal use only and is not rated to power an electric water feeder directly. A standard #11 switch should be used for feeder applications.
What is the difference between the 11-M and the 11-MV switches?
While both are manual reset, the 11-M (354001) is designed for 24V or 120V pilot duty (depending on the specific model wiring), whereas the 11-MV is specifically tailored for millivolt gas valve systems or 24V burners with special contact requirements.
How do I verify the switch is properly set during installation?
Ensure the "TOP" indicator on the switch is oriented correctly and the U-shaped notch aligns with the float mechanism roller. The switch housing can be rotated, but the 11M reset button orientation must remain vertical for proper mechanical latching.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
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Description
The McDonnell & Miller 354001 is a professional-grade E-11M 24V 2-SPST M/R Switch engineered for critical low water cut-off (LWCO) applications in residential and commercial boiler systems. This manual reset switch (M/R) provides high-reliability safety by latching open during a low water condition, requiring a technician to physically depress the reset button only after the proper water level has been restored. Built for durability in demanding mechanical rooms, the 354001 replacement switch features dual single-pole, single-throw (SPST) contacts, allowing for simultaneous control of the burner circuit and an auxiliary alarm or low water signal. It is specifically designed as a drop-in HVAC manual reset control for McDonnell & Miller Series 67, 61, 64, 69, 764, and 767 low water cut-offs. The 24VAC configuration is ideal for modern low-voltage control strings, ensuring seamless integration with existing 24V burner circuits and secondary safety limits.
Key Benefits for Technicians- System Safety: Manual reset functionality prevents automatic boiler cycling in dangerous dry-fire conditions, ensuring the root cause of water loss is addressed.
- Broad Compatibility: Direct replacement for the legacy 11M and 309151 models across multiple LWCO series.
- Internal Redundancy: Features dual SPST switches to manage both the primary burner safety circuit and an external alarm.
- Precision Engineering: Rated for a maximum boiler pressure of 20 psi, making it a standard choice for low-pressure steam and hot water systems.
- Reliable Switching: Snap-action contacts ensure crisp, dependable operation even in high-temperature environments near the boiler vessel.
Can the E-11M 24V switch be used to control an electric water feeder?
No, terminal 4 on the E-11M is intended for alarm or signal use only and is not rated to power an electric water feeder directly. A standard #11 switch should be used for feeder applications.
What is the difference between the 11-M and the 11-MV switches?
While both are manual reset, the 11-M (354001) is designed for 24V or 120V pilot duty (depending on the specific model wiring), whereas the 11-MV is specifically tailored for millivolt gas valve systems or 24V burners with special contact requirements.
How do I verify the switch is properly set during installation?
Ensure the "TOP" indicator on the switch is oriented correctly and the U-shaped notch aligns with the float mechanism roller. The switch housing can be rotated, but the 11M reset button orientation must remain vertical for proper mechanical latching.
This item is not eligible for free shipping.
Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.
