Marley Engineered Products 4520-2025-000 High Limit
For service technicians maintaining Marley high-output heating systems, the Marley Engineered Products 4520-2025-000 High Limit is a critical safety component designed for open on rise circuit protection. This SPST (Single Pole Single Throw) limit switch is engineered to trip and interrupt the heating circuit when temperatures reach 180°F, preventing heat exchanger damage and potential fire hazards. As an automatic reset control, it restores continuity once the ambient temperature drops to 40°F, ensuring the system can resume operation without manual intervention once the thermal event has dissipated. Also identified as the L180-40F, this Marley replacement part is essential for refurbishing Berko and QMark electric heaters where accurate thermal monitoring is required. The rugged construction and precise setpoints make it a reliable HVAC high limit switch for demanding multi-stage units, providing the over-temperature protection necessary to meet strict safety standards in residential and commercial installations.
Key Benefits- Automatic Reset Logic: Eliminates the need for manual resets by automatically closing the circuit when temperatures normalize at 40°F.
- Precise Thermal Cut-off: Features a fixed 180°F opening temperature to ensure immediate high limit protection during airflow obstruction or blower failure.
- OEM Compatibility: Designed specifically for Marley Engineered Products, Berko, and QMark heating units, ensuring exact fit and electrical alignment.
- SPST Configuration: Standard single-pole design allows for straightforward integration into existing control loops.
Is the 4520-2025-000 a manual or automatic reset switch?
This specific model is an automatic reset switch. It will reset itself once the temperature reaches the 40°F closing threshold.
What causes this high limit switch to trip frequently?
Frequent tripping usually indicates restricted airflow, such as a clogged filter, a failing blower motor, or blocked discharge grilles. If the switch stays open even after cooling, it may have reached its end-of-life and requires replacement.
Can I use this 180-40F limit in any heater?
No, high limits are rated for specific BTU outputs and internal clearances. You must verify that your unit specifies an L180-40F to maintain the safety profile of the equipment.
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: $12.44
-65%$12.44
$4.35Marley Engineered Products 4520-2025-000 High Limit
For service technicians maintaining Marley high-output heating systems, the Marley Engineered Products 4520-2025-000 High Limit is a critical safety component designed for open on rise circuit protection. This SPST (Single Pole Single Throw) limit switch is engineered to trip and interrupt the heating circuit when temperatures reach 180°F, preventing heat exchanger damage and potential fire hazards. As an automatic reset control, it restores continuity once the ambient temperature drops to 40°F, ensuring the system can resume operation without manual intervention once the thermal event has dissipated. Also identified as the L180-40F, this Marley replacement part is essential for refurbishing Berko and QMark electric heaters where accurate thermal monitoring is required. The rugged construction and precise setpoints make it a reliable HVAC high limit switch for demanding multi-stage units, providing the over-temperature protection necessary to meet strict safety standards in residential and commercial installations.
Key Benefits- Automatic Reset Logic: Eliminates the need for manual resets by automatically closing the circuit when temperatures normalize at 40°F.
- Precise Thermal Cut-off: Features a fixed 180°F opening temperature to ensure immediate high limit protection during airflow obstruction or blower failure.
- OEM Compatibility: Designed specifically for Marley Engineered Products, Berko, and QMark heating units, ensuring exact fit and electrical alignment.
- SPST Configuration: Standard single-pole design allows for straightforward integration into existing control loops.
Is the 4520-2025-000 a manual or automatic reset switch?
This specific model is an automatic reset switch. It will reset itself once the temperature reaches the 40°F closing threshold.
What causes this high limit switch to trip frequently?
Frequent tripping usually indicates restricted airflow, such as a clogged filter, a failing blower motor, or blocked discharge grilles. If the switch stays open even after cooling, it may have reached its end-of-life and requires replacement.
Can I use this 180-40F limit in any heater?
No, high limits are rated for specific BTU outputs and internal clearances. You must verify that your unit specifies an L180-40F to maintain the safety profile of the equipment.
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
For service technicians maintaining Marley high-output heating systems, the Marley Engineered Products 4520-2025-000 High Limit is a critical safety component designed for open on rise circuit protection. This SPST (Single Pole Single Throw) limit switch is engineered to trip and interrupt the heating circuit when temperatures reach 180°F, preventing heat exchanger damage and potential fire hazards. As an automatic reset control, it restores continuity once the ambient temperature drops to 40°F, ensuring the system can resume operation without manual intervention once the thermal event has dissipated. Also identified as the L180-40F, this Marley replacement part is essential for refurbishing Berko and QMark electric heaters where accurate thermal monitoring is required. The rugged construction and precise setpoints make it a reliable HVAC high limit switch for demanding multi-stage units, providing the over-temperature protection necessary to meet strict safety standards in residential and commercial installations.
Key Benefits- Automatic Reset Logic: Eliminates the need for manual resets by automatically closing the circuit when temperatures normalize at 40°F.
- Precise Thermal Cut-off: Features a fixed 180°F opening temperature to ensure immediate high limit protection during airflow obstruction or blower failure.
- OEM Compatibility: Designed specifically for Marley Engineered Products, Berko, and QMark heating units, ensuring exact fit and electrical alignment.
- SPST Configuration: Standard single-pole design allows for straightforward integration into existing control loops.
Is the 4520-2025-000 a manual or automatic reset switch?
This specific model is an automatic reset switch. It will reset itself once the temperature reaches the 40°F closing threshold.
What causes this high limit switch to trip frequently?
Frequent tripping usually indicates restricted airflow, such as a clogged filter, a failing blower motor, or blocked discharge grilles. If the switch stays open even after cooling, it may have reached its end-of-life and requires replacement.
Can I use this 180-40F limit in any heater?
No, high limits are rated for specific BTU outputs and internal clearances. You must verify that your unit specifies an L180-40F to maintain the safety profile of the equipment.
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.
