Trane CNT4820 Limit
The Trane CNT4820 is a specialized bi-metal disc limit switch designed for critical thermal protection in heating and cooling systems. Engineered as a normally closed (N/C) safety control, this SPST (Single Pole Single Throw) device features an auto-reset (A/R) function, ensuring the circuit automatically closes once temperatures return to a safe range below the 155°F open temperature. As an HVAC high limit switch, the CNT4820 is built to handle the rigors of industrial and residential applications, providing pilot duty reliability with a 125VA rating and compatibility with 120/240V systems.
When troubleshooting a system that is short-cycling or failing to provide heat, verifying the limit switch continuity is a essential first step for any technician. The CNT4820 limit is specifically calibrated to sense abnormal temperature spikes, opening the circuit to prevent equipment damage or hazardous conditions. Its bi-metal disc construction offers precise responsiveness, while the 18 AWG lead wires and female terminals allow for a streamlined installation on the air handler or furnace plenum. For contractors maintaining Trane HVAC systems, using genuine OEM controls like this 155f open limit switch is necessary to maintain specified performance and safety protocols.
Key Benefits- Automatic Reset Function: The A/R limit switch eliminates manual intervention by restoring the circuit once the system cools down, reducing unnecessary service calls for simple over-temperature events.
- Precision Thermal Protection: Calibrated with a 155 degree open setpoint to provide a reliable safety shut-off for blower and burner assemblies.
- Universal Compatibility: Designed for standard HVAC control circuits, supporting 120V and 240V applications with a robust pilot duty construction.
- Simplified Wiring: Features factory-integrated 18 AWG wires and standard terminals for direct OEM replacement in various Trane and American Standard models.
How do I test if the Trane CNT4820 is functioning correctly?
Using a multimeter set to the ohms scale, check for continuity across the terminals at room temperature. Since this is a normally closed limit switch, you should see near-zero resistance. If the circuit stays open at room temperature, the bi-metal disc or internal contacts have failed.
What causes a 155F limit switch to trip frequently?
Frequent tripping usually points to airflow issues, such as a clogged air filter, a failing blower motor, or obstructed ductwork. If the temperature at the sensor exceeds 155 degrees, the switch is performing its intended safety function by interrupting the heating cycle.
Can this limit switch be used in both heating and cooling units?
Yes, the CNT4820 is utilized across various HVAC platforms, including furnaces and air handlers, where over-temperature safety is required to protect the heat exchanger or electrical components.
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: $149.88
-65%$149.88
$52.46Trane CNT4820 Limit
The Trane CNT4820 is a specialized bi-metal disc limit switch designed for critical thermal protection in heating and cooling systems. Engineered as a normally closed (N/C) safety control, this SPST (Single Pole Single Throw) device features an auto-reset (A/R) function, ensuring the circuit automatically closes once temperatures return to a safe range below the 155°F open temperature. As an HVAC high limit switch, the CNT4820 is built to handle the rigors of industrial and residential applications, providing pilot duty reliability with a 125VA rating and compatibility with 120/240V systems.
When troubleshooting a system that is short-cycling or failing to provide heat, verifying the limit switch continuity is a essential first step for any technician. The CNT4820 limit is specifically calibrated to sense abnormal temperature spikes, opening the circuit to prevent equipment damage or hazardous conditions. Its bi-metal disc construction offers precise responsiveness, while the 18 AWG lead wires and female terminals allow for a streamlined installation on the air handler or furnace plenum. For contractors maintaining Trane HVAC systems, using genuine OEM controls like this 155f open limit switch is necessary to maintain specified performance and safety protocols.
Key Benefits- Automatic Reset Function: The A/R limit switch eliminates manual intervention by restoring the circuit once the system cools down, reducing unnecessary service calls for simple over-temperature events.
- Precision Thermal Protection: Calibrated with a 155 degree open setpoint to provide a reliable safety shut-off for blower and burner assemblies.
- Universal Compatibility: Designed for standard HVAC control circuits, supporting 120V and 240V applications with a robust pilot duty construction.
- Simplified Wiring: Features factory-integrated 18 AWG wires and standard terminals for direct OEM replacement in various Trane and American Standard models.
How do I test if the Trane CNT4820 is functioning correctly?
Using a multimeter set to the ohms scale, check for continuity across the terminals at room temperature. Since this is a normally closed limit switch, you should see near-zero resistance. If the circuit stays open at room temperature, the bi-metal disc or internal contacts have failed.
What causes a 155F limit switch to trip frequently?
Frequent tripping usually points to airflow issues, such as a clogged air filter, a failing blower motor, or obstructed ductwork. If the temperature at the sensor exceeds 155 degrees, the switch is performing its intended safety function by interrupting the heating cycle.
Can this limit switch be used in both heating and cooling units?
Yes, the CNT4820 is utilized across various HVAC platforms, including furnaces and air handlers, where over-temperature safety is required to protect the heat exchanger or electrical components.
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 CNT4820 is a specialized bi-metal disc limit switch designed for critical thermal protection in heating and cooling systems. Engineered as a normally closed (N/C) safety control, this SPST (Single Pole Single Throw) device features an auto-reset (A/R) function, ensuring the circuit automatically closes once temperatures return to a safe range below the 155°F open temperature. As an HVAC high limit switch, the CNT4820 is built to handle the rigors of industrial and residential applications, providing pilot duty reliability with a 125VA rating and compatibility with 120/240V systems.
When troubleshooting a system that is short-cycling or failing to provide heat, verifying the limit switch continuity is a essential first step for any technician. The CNT4820 limit is specifically calibrated to sense abnormal temperature spikes, opening the circuit to prevent equipment damage or hazardous conditions. Its bi-metal disc construction offers precise responsiveness, while the 18 AWG lead wires and female terminals allow for a streamlined installation on the air handler or furnace plenum. For contractors maintaining Trane HVAC systems, using genuine OEM controls like this 155f open limit switch is necessary to maintain specified performance and safety protocols.
Key Benefits- Automatic Reset Function: The A/R limit switch eliminates manual intervention by restoring the circuit once the system cools down, reducing unnecessary service calls for simple over-temperature events.
- Precision Thermal Protection: Calibrated with a 155 degree open setpoint to provide a reliable safety shut-off for blower and burner assemblies.
- Universal Compatibility: Designed for standard HVAC control circuits, supporting 120V and 240V applications with a robust pilot duty construction.
- Simplified Wiring: Features factory-integrated 18 AWG wires and standard terminals for direct OEM replacement in various Trane and American Standard models.
How do I test if the Trane CNT4820 is functioning correctly?
Using a multimeter set to the ohms scale, check for continuity across the terminals at room temperature. Since this is a normally closed limit switch, you should see near-zero resistance. If the circuit stays open at room temperature, the bi-metal disc or internal contacts have failed.
What causes a 155F limit switch to trip frequently?
Frequent tripping usually points to airflow issues, such as a clogged air filter, a failing blower motor, or obstructed ductwork. If the temperature at the sensor exceeds 155 degrees, the switch is performing its intended safety function by interrupting the heating cycle.
Can this limit switch be used in both heating and cooling units?
Yes, the CNT4820 is utilized across various HVAC platforms, including furnaces and air handlers, where over-temperature safety is required to protect the heat exchanger or electrical components.
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.
