Lennox X4148 Temperature Sensor

The Lennox X4148 Temperature Sensor is a high-precision NTC (Negative Temperature Coefficient) thermistor designed for critical outdoor ambient monitoring. Engineered specifically for integration with Lennox Comfort Sense 5000 thermostats, including the X4146 and X4147 models, this sensor is essential for dual-fuel HVAC systems. It provides the real-time thermal data required for accurate staging and auxiliary heat lockout, ensuring the system toggles between heat pump and gas furnace operation at the optimal balance point. With an operating range of -40 to 120°F, this outdoor temperature sensor maintains consistent resistance values that the control board interprets to optimize energy-efficient HVAC performance. For contractors performing an HVAC sensor replacement, the X4148 features 60-inch leadwires and a dedicated mounting clip for fast, secure installation on the exterior of a structure, preferably on the north side to avoid solar gain interference. Utilizing this Lennox OEM part eliminates the calibration errors often seen with generic thermistors, preserving your client's system logic and preventing erratic compressor cycling.

• System Optimization: Enables critical features like heat pump balance points and fossil fuel kit staging.
• Precision Accuracy: High-grade NTC thermistor provides reliable resistance-to-temperature conversion for precise HVAC temperature monitoring.
• Rugged Durability: Rated for extreme ambient environments from -40°F to 120°F with non-condensing humidity protection.
• Plug-and-Play Compatibility: Specifically calibrated for Comfort Sense 5000 series controls and compatible Lennox residential units.
• Flexible Installation: Includes 5 feet of leadwire, allowing for versatile mounting away from direct sunlight and exhaust vents.

Is the Lennox X4148 compatible with all smart thermostats?
The X4148 is specifically designed for the Lennox Comfort Sense 5000 series (X4146 and X4147). For newer iComfort S40 or communicating systems, verify the resistance curve requirements as they may use different sensor protocols.

Where is the best location to mount this sensor?
Mount the sensor on the north side of the building where it is shielded from direct sunlight and at least one foot away from large inductive loads or high-voltage wiring to prevent electrical noise interference.

What wire gauge should be used if I need to extend the leads?
If the included 60-inch leads are insufficient, use 18-gauge color-coded thermostat wire. Ensure all connections are sealed with non-hardening caulk to prevent moisture from affecting the resistance readings.

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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.