Beacon-Morris 11J11R00306-002 High Limit Switch (BM / BTU Series)
Product Overview
The Beacon-Morris 11J11R00306-002 High Limit Switch is a factory-original safety component designed for BM and BTU series unit heaters. This part plays a critical role in protecting your heating system by shutting down the burner if unsafe temperatures are detected, preventing overheating and equipment damage.
This updated switch replaces the older 3-prong design and is wired only to terminals 1 and 2 (terminal 3 is not used). It is compatible with a wide range of Beacon-Morris unit heater models and BTU sizes, making it a dependable choice for both garage heater repair and commercial HVAC maintenance.
Compatible Models: BMF, BMEF, BTU, BMSF, BMSB
Compatible Sizes (BTU): 100, 125, 150, 175, 200, 225, 250, 300, 400
Previous Part #: 21120
ID #: 604731
Features & Benefits
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OEM Replacement: Genuine Beacon-Morris high limit switch ensures compatibility and reliability.
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Safety Assurance: Prevents overheating by shutting down the system at unsafe temperatures.
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Updated Design: Replaces the older 3-prong switch for improved reliability.
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Wide Compatibility: Fits multiple BM and BTU series models across various BTU capacities.
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Durable Construction: Built for long-lasting performance in demanding HVAC environments.
Specifications
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Part Number: 11J11R00306-002
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Alternate Part Numbers: 203675, T-O-D 60T23, A1934 F170-40F
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Previous Part Number: 21120
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Compatible Models: BMF, BMEF, BTU, BMSF, BMSB
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BTU Ranges Supported: 100 – 400
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ID #: 604731
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Design Update: 2-terminal wiring (do not use terminal 3)
Installation Tips
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Always disconnect power before servicing unit heaters.
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Wire only to terminals 1 and 2; do not connect terminal 3.
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Verify compatibility with your unit heater model and BTU rating before installation.
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Inspect wiring and connections for wear before replacing the switch.
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For safety and compliance, professional installation by an HVAC technician is recommended.
FAQs
Q: What does a high limit switch do in a unit heater?
It protects the unit by shutting off the burner if the system temperature exceeds safe limits.
Q: Can this replace the older 3-prong high limit switch?
Yes, this updated version replaces the older 3-prong design. Use only terminals 1 and 2.
Q: Which Beacon-Morris models is this part compatible with?
It works with BMF, BMEF, BTU, BMSF, and BMSB series heaters.
Q: What BTU sizes does this switch support?
It is compatible with sizes from 100,000 to 400,000 BTU.
Q: Do I need a technician to install this part?
Professional installation is recommended to ensure proper function and safety.
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