Trane THT2855 Limit Switch
The Trane THT2855 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This fixed-temperature limit control is engineered to interrupt the electrical circuit when internal plenum temperatures exceed safety thresholds, preventing heat exchanger damage and potential fire hazards. This specific manually-operated safety switch features a cut-out temperature of 145°F and a cut-in (reset) temperature of 85°F, providing a consistent 60-degree differential for reliable furnace operation. As an OEM replacement part, it ensures exact fitment and calibration for Trane and American Standard air handlers and gas furnaces, maintaining the original equipment’s safety sequence without the need for field modifications. When diagnosing short-cycling or furnace limit circuit lockouts, the Trane THT02855 offers the thermal sensitivity required to protect high-efficiency heating modules while minimizing nuisance tripping under standard airflow conditions.
Key Benefits for Contractors- Critical Thermal Safety: Precisely calibrated 145-degree open setpoint ensures the system shuts down before reaching critical overheat levels.
- OEM Reliability: Direct replacement for PN THT2855, eliminating the risks associated with generic universal switches that may have drifting tolerances.
- Internal Bimetal Logic: Utilizes a high-grade bimetallic disc for snap-action switching, ensuring clean electrical breaks and longevity over thousands of cycles.
- Wide Compatibility: Standard furnace high limit switch footprint allows for rapid installation in existing mounting brackets and wiring harnesses.
What causes a Trane furnace to trip the THT2855 limit switch?
Repeated tripping is typically indicative of restricted airflow, often caused by a heavily loaded air filter, a failing blower motor, or obstructed return air ducts. If the switch remains open, it must be inspected for continuity.
Can this limit switch be used in 24V or 120V circuits?
Yes, this switch is designed to handle the standard voltages found in HVAC control strings, but technicians should always verify the amperage draw against the contact ratings to prevent premature failure.
is the THT2855 an automatic or manual reset switch?
This model is an automatic reset switch, meaning it will close the circuit once the temperature drops below the 85-degree cut-in threshold. If the furnace fails to restart after cooling, the switch may be failed open.
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: $30.57
-65%$30.57
$10.70Trane THT2855 Limit Switch
The Trane THT2855 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This fixed-temperature limit control is engineered to interrupt the electrical circuit when internal plenum temperatures exceed safety thresholds, preventing heat exchanger damage and potential fire hazards. This specific manually-operated safety switch features a cut-out temperature of 145°F and a cut-in (reset) temperature of 85°F, providing a consistent 60-degree differential for reliable furnace operation. As an OEM replacement part, it ensures exact fitment and calibration for Trane and American Standard air handlers and gas furnaces, maintaining the original equipment’s safety sequence without the need for field modifications. When diagnosing short-cycling or furnace limit circuit lockouts, the Trane THT02855 offers the thermal sensitivity required to protect high-efficiency heating modules while minimizing nuisance tripping under standard airflow conditions.
Key Benefits for Contractors- Critical Thermal Safety: Precisely calibrated 145-degree open setpoint ensures the system shuts down before reaching critical overheat levels.
- OEM Reliability: Direct replacement for PN THT2855, eliminating the risks associated with generic universal switches that may have drifting tolerances.
- Internal Bimetal Logic: Utilizes a high-grade bimetallic disc for snap-action switching, ensuring clean electrical breaks and longevity over thousands of cycles.
- Wide Compatibility: Standard furnace high limit switch footprint allows for rapid installation in existing mounting brackets and wiring harnesses.
What causes a Trane furnace to trip the THT2855 limit switch?
Repeated tripping is typically indicative of restricted airflow, often caused by a heavily loaded air filter, a failing blower motor, or obstructed return air ducts. If the switch remains open, it must be inspected for continuity.
Can this limit switch be used in 24V or 120V circuits?
Yes, this switch is designed to handle the standard voltages found in HVAC control strings, but technicians should always verify the amperage draw against the contact ratings to prevent premature failure.
is the THT2855 an automatic or manual reset switch?
This model is an automatic reset switch, meaning it will close the circuit once the temperature drops below the 85-degree cut-in threshold. If the furnace fails to restart after cooling, the switch may be failed open.
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 Trane THT2855 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and light commercial HVAC systems. This fixed-temperature limit control is engineered to interrupt the electrical circuit when internal plenum temperatures exceed safety thresholds, preventing heat exchanger damage and potential fire hazards. This specific manually-operated safety switch features a cut-out temperature of 145°F and a cut-in (reset) temperature of 85°F, providing a consistent 60-degree differential for reliable furnace operation. As an OEM replacement part, it ensures exact fitment and calibration for Trane and American Standard air handlers and gas furnaces, maintaining the original equipment’s safety sequence without the need for field modifications. When diagnosing short-cycling or furnace limit circuit lockouts, the Trane THT02855 offers the thermal sensitivity required to protect high-efficiency heating modules while minimizing nuisance tripping under standard airflow conditions.
Key Benefits for Contractors- Critical Thermal Safety: Precisely calibrated 145-degree open setpoint ensures the system shuts down before reaching critical overheat levels.
- OEM Reliability: Direct replacement for PN THT2855, eliminating the risks associated with generic universal switches that may have drifting tolerances.
- Internal Bimetal Logic: Utilizes a high-grade bimetallic disc for snap-action switching, ensuring clean electrical breaks and longevity over thousands of cycles.
- Wide Compatibility: Standard furnace high limit switch footprint allows for rapid installation in existing mounting brackets and wiring harnesses.
What causes a Trane furnace to trip the THT2855 limit switch?
Repeated tripping is typically indicative of restricted airflow, often caused by a heavily loaded air filter, a failing blower motor, or obstructed return air ducts. If the switch remains open, it must be inspected for continuity.
Can this limit switch be used in 24V or 120V circuits?
Yes, this switch is designed to handle the standard voltages found in HVAC control strings, but technicians should always verify the amperage draw against the contact ratings to prevent premature failure.
is the THT2855 an automatic or manual reset switch?
This model is an automatic reset switch, meaning it will close the circuit once the temperature drops below the 85-degree cut-in threshold. If the furnace fails to restart after cooling, the switch may be failed open.
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.
