McDonnell & Miller 94-7B-HD Controller
The McDonnell & Miller 94-7B-HD is a high-performance head mechanism only designed for heavy-duty commercial and industrial steam applications. As a critical replacement head mechanism for Series 94 and 194 controllers, this unit integrates a combination low water cut-off and pump controller to maintain precise boiler water level control. Engineered for systems with a maximum pressure of 250 PSI, it utilizes a 7B potentiometer switch to provide a 135-ohm proportional signal, ensuring a constant water line by modulating feedwater flow rather than simple on/off cycling. This 166400 head mechanism features a 10-bolt flange design, allowing technicians to perform a drop-in replacement without disrupting existing piping. By employing magnetic repulsion to actuate the switches, it eliminates the failure points associated with traditional bellows, providing superior reliability in high-pressure environments. This unit is built to withstand rigorous steam boiler safety requirements while optimizing pump efficiency across any steaming capacity.
Key Benefits- Magnetic Repulsion Technology: Eliminates bellows for increased reliability and resistance to mechanical fatigue in high-pressure steam environments.
- Precise Proportional Control: Features a 7B potentiometer switch providing a 135-ohm signal for consistent boiler feedwater management.
- Direct Head Replacement: Designed as a head mechanism only (166400), facilitating fast field service by utilizing the existing 10-bolt float chamber.
- High Pressure Rating: Rated for up to 250 PSI max pressure, making it suitable for demanding industrial steam boiler applications.
- Universal Capacity: Maintains a stable water level regardless of the boiler's steaming rate or operational demand.
Does this unit include the float bowl?
No, the 94-7B-HD is the head mechanism only. It includes the internal works, switch, and mounting flange, but is intended to be bolted onto your existing McDonnell & Miller float chamber.
Can I use this for both low and high pressure boilers?
Yes, the Series 94 is specifically designed for commercial and industrial applications ranging from low pressure up to 250 PSI.
What is the benefit of the potentiometer switch versus a standard snap switch?
The 7B switch provides a proportional signal to a modulating valve or motor, allowing for a more stable water level and reducing the thermal shock and wear caused by frequent pump cycling.
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: $3,018.31
-65%$3,018.31
$1,056.41McDonnell & Miller 94-7B-HD Controller
The McDonnell & Miller 94-7B-HD is a high-performance head mechanism only designed for heavy-duty commercial and industrial steam applications. As a critical replacement head mechanism for Series 94 and 194 controllers, this unit integrates a combination low water cut-off and pump controller to maintain precise boiler water level control. Engineered for systems with a maximum pressure of 250 PSI, it utilizes a 7B potentiometer switch to provide a 135-ohm proportional signal, ensuring a constant water line by modulating feedwater flow rather than simple on/off cycling. This 166400 head mechanism features a 10-bolt flange design, allowing technicians to perform a drop-in replacement without disrupting existing piping. By employing magnetic repulsion to actuate the switches, it eliminates the failure points associated with traditional bellows, providing superior reliability in high-pressure environments. This unit is built to withstand rigorous steam boiler safety requirements while optimizing pump efficiency across any steaming capacity.
Key Benefits- Magnetic Repulsion Technology: Eliminates bellows for increased reliability and resistance to mechanical fatigue in high-pressure steam environments.
- Precise Proportional Control: Features a 7B potentiometer switch providing a 135-ohm signal for consistent boiler feedwater management.
- Direct Head Replacement: Designed as a head mechanism only (166400), facilitating fast field service by utilizing the existing 10-bolt float chamber.
- High Pressure Rating: Rated for up to 250 PSI max pressure, making it suitable for demanding industrial steam boiler applications.
- Universal Capacity: Maintains a stable water level regardless of the boiler's steaming rate or operational demand.
Does this unit include the float bowl?
No, the 94-7B-HD is the head mechanism only. It includes the internal works, switch, and mounting flange, but is intended to be bolted onto your existing McDonnell & Miller float chamber.
Can I use this for both low and high pressure boilers?
Yes, the Series 94 is specifically designed for commercial and industrial applications ranging from low pressure up to 250 PSI.
What is the benefit of the potentiometer switch versus a standard snap switch?
The 7B switch provides a proportional signal to a modulating valve or motor, allowing for a more stable water level and reducing the thermal shock and wear caused by frequent pump cycling.
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 94-7B-HD is a high-performance head mechanism only designed for heavy-duty commercial and industrial steam applications. As a critical replacement head mechanism for Series 94 and 194 controllers, this unit integrates a combination low water cut-off and pump controller to maintain precise boiler water level control. Engineered for systems with a maximum pressure of 250 PSI, it utilizes a 7B potentiometer switch to provide a 135-ohm proportional signal, ensuring a constant water line by modulating feedwater flow rather than simple on/off cycling. This 166400 head mechanism features a 10-bolt flange design, allowing technicians to perform a drop-in replacement without disrupting existing piping. By employing magnetic repulsion to actuate the switches, it eliminates the failure points associated with traditional bellows, providing superior reliability in high-pressure environments. This unit is built to withstand rigorous steam boiler safety requirements while optimizing pump efficiency across any steaming capacity.
Key Benefits- Magnetic Repulsion Technology: Eliminates bellows for increased reliability and resistance to mechanical fatigue in high-pressure steam environments.
- Precise Proportional Control: Features a 7B potentiometer switch providing a 135-ohm signal for consistent boiler feedwater management.
- Direct Head Replacement: Designed as a head mechanism only (166400), facilitating fast field service by utilizing the existing 10-bolt float chamber.
- High Pressure Rating: Rated for up to 250 PSI max pressure, making it suitable for demanding industrial steam boiler applications.
- Universal Capacity: Maintains a stable water level regardless of the boiler's steaming rate or operational demand.
Does this unit include the float bowl?
No, the 94-7B-HD is the head mechanism only. It includes the internal works, switch, and mounting flange, but is intended to be bolted onto your existing McDonnell & Miller float chamber.
Can I use this for both low and high pressure boilers?
Yes, the Series 94 is specifically designed for commercial and industrial applications ranging from low pressure up to 250 PSI.
What is the benefit of the potentiometer switch versus a standard snap switch?
The 7B switch provides a proportional signal to a modulating valve or motor, allowing for a more stable water level and reducing the thermal shock and wear caused by frequent pump cycling.
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.
