Lochinvar & A.O. Smith 100278104 Switch
The Lochinvar & A.O. Smith 100278104 Switch is a critical safety component designed for high-performance hydronic and domestic hot water systems. This 100F manual reset limit switch acts as a primary thermal safeguard, effectively monitoring surface or water temperatures and interrupting the electrical circuit to the gas valve if the 100-degree Fahrenheit threshold is exceeded. Engineering for reliability, this manual reset high limit switch prevents uncontrolled combustion and potential heat exchanger damage by requiring an on-site technician to inspect the system before restoring operation.
A veteren contractor knows that maintaining OEM boiler parts is essential for system integrity. The 100278104 limit switch is frequently utilized in Lochinvar and A.O. Smith equipment, including the CB045 series and similar modulating boiler configurations. Its mechanical relay design provides a fail-safe response to over-temperature conditions, ensuring that your HVACR safety controls meet rigorous operational standards. Whether you are performing a rollout switch replacement or addressing a tripped high limit, this genuine Lochinvar limit switch delivers the precise calibration necessary for commercial and residential boiler safety.
Key Benefits- Precise Thermal Protection: Engineered to trip exactly at 100°F (38°C) to protect sensitive system components from overheating.
- Manual Reset Mechanism: Ensures a mandatory system check following a high-limit event, enhancing overall site safety.
- Broad Compatibility: Directly replaces multiple A.O. Smith and Lochinvar part numbers, including 100278104 and legacy equivalents.
- Durable Construction: Built to withstand the high-cycle demands of professional HVACR environments.
What causes this switch to trip in a Lochinvar boiler?
A trip is typically caused by restricted water flow, a failing circulator pump, or scale buildup within the heat exchanger. Because this is a manual reset switch, you must physically depress the reset button after resolving the underlying heat dissipation issue.
Can this switch be used in place of an automatic reset limit?
No. This component is a safety limit designed to lock out the burner until inspected. Replacing a manual reset with an automatic reset can lead to dangerous short-cycling and equipment failure.
How do I verify if the 100278104 switch is faulty?
Use a multimeter to check for continuity across the terminals. If the switch shows an open loop (no continuity) while the system is cool and the button is depressed, the internal contacts have likely failed and the part requires replacement.
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: $82.40
-65%$82.40
$28.84Lochinvar & A.O. Smith 100278104 Switch
The Lochinvar & A.O. Smith 100278104 Switch is a critical safety component designed for high-performance hydronic and domestic hot water systems. This 100F manual reset limit switch acts as a primary thermal safeguard, effectively monitoring surface or water temperatures and interrupting the electrical circuit to the gas valve if the 100-degree Fahrenheit threshold is exceeded. Engineering for reliability, this manual reset high limit switch prevents uncontrolled combustion and potential heat exchanger damage by requiring an on-site technician to inspect the system before restoring operation.
A veteren contractor knows that maintaining OEM boiler parts is essential for system integrity. The 100278104 limit switch is frequently utilized in Lochinvar and A.O. Smith equipment, including the CB045 series and similar modulating boiler configurations. Its mechanical relay design provides a fail-safe response to over-temperature conditions, ensuring that your HVACR safety controls meet rigorous operational standards. Whether you are performing a rollout switch replacement or addressing a tripped high limit, this genuine Lochinvar limit switch delivers the precise calibration necessary for commercial and residential boiler safety.
Key Benefits- Precise Thermal Protection: Engineered to trip exactly at 100°F (38°C) to protect sensitive system components from overheating.
- Manual Reset Mechanism: Ensures a mandatory system check following a high-limit event, enhancing overall site safety.
- Broad Compatibility: Directly replaces multiple A.O. Smith and Lochinvar part numbers, including 100278104 and legacy equivalents.
- Durable Construction: Built to withstand the high-cycle demands of professional HVACR environments.
What causes this switch to trip in a Lochinvar boiler?
A trip is typically caused by restricted water flow, a failing circulator pump, or scale buildup within the heat exchanger. Because this is a manual reset switch, you must physically depress the reset button after resolving the underlying heat dissipation issue.
Can this switch be used in place of an automatic reset limit?
No. This component is a safety limit designed to lock out the burner until inspected. Replacing a manual reset with an automatic reset can lead to dangerous short-cycling and equipment failure.
How do I verify if the 100278104 switch is faulty?
Use a multimeter to check for continuity across the terminals. If the switch shows an open loop (no continuity) while the system is cool and the button is depressed, the internal contacts have likely failed and the part requires replacement.
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 Lochinvar & A.O. Smith 100278104 Switch is a critical safety component designed for high-performance hydronic and domestic hot water systems. This 100F manual reset limit switch acts as a primary thermal safeguard, effectively monitoring surface or water temperatures and interrupting the electrical circuit to the gas valve if the 100-degree Fahrenheit threshold is exceeded. Engineering for reliability, this manual reset high limit switch prevents uncontrolled combustion and potential heat exchanger damage by requiring an on-site technician to inspect the system before restoring operation.
A veteren contractor knows that maintaining OEM boiler parts is essential for system integrity. The 100278104 limit switch is frequently utilized in Lochinvar and A.O. Smith equipment, including the CB045 series and similar modulating boiler configurations. Its mechanical relay design provides a fail-safe response to over-temperature conditions, ensuring that your HVACR safety controls meet rigorous operational standards. Whether you are performing a rollout switch replacement or addressing a tripped high limit, this genuine Lochinvar limit switch delivers the precise calibration necessary for commercial and residential boiler safety.
Key Benefits- Precise Thermal Protection: Engineered to trip exactly at 100°F (38°C) to protect sensitive system components from overheating.
- Manual Reset Mechanism: Ensures a mandatory system check following a high-limit event, enhancing overall site safety.
- Broad Compatibility: Directly replaces multiple A.O. Smith and Lochinvar part numbers, including 100278104 and legacy equivalents.
- Durable Construction: Built to withstand the high-cycle demands of professional HVACR environments.
What causes this switch to trip in a Lochinvar boiler?
A trip is typically caused by restricted water flow, a failing circulator pump, or scale buildup within the heat exchanger. Because this is a manual reset switch, you must physically depress the reset button after resolving the underlying heat dissipation issue.
Can this switch be used in place of an automatic reset limit?
No. This component is a safety limit designed to lock out the burner until inspected. Replacing a manual reset with an automatic reset can lead to dangerous short-cycling and equipment failure.
How do I verify if the 100278104 switch is faulty?
Use a multimeter to check for continuity across the terminals. If the switch shows an open loop (no continuity) while the system is cool and the button is depressed, the internal contacts have likely failed and the part requires replacement.
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.
