Carrier 33ZCT55SPT Temperature Sensor

The Carrier 33ZCT55SPT is a commercial-grade space temperature sensor designed for high-precision environmental monitoring in Carrier Comfort Network (CCN) and i-Vu systems. As a veteran-verified 10K ohm thermistor, this unit provides exceptional stability, effectively eliminating the common issues of calibration drift often seen in lower-tier wall sensors. The integrated push-button override is a critical feature for field applications, allowing occupants to signal a temporary schedule change directly to the HVAC zone controller without the need for complex thermostat adjustments. Engineered with a low-profile, beige housing, the 33ZCT55SPT mounts to a standard 2x4 NEMA junction box and requires only a single twisted shielded pair (TSP) for both temperature data and override signals, significantly reducing wiring labor for technicians. This sensor is fully compatible with Carrier fan coil controllers and VAV systems, ensuring seamless integration into existing BAS (Building Automation Systems). By utilizing authentic OEM HVAC replacement parts, contractors can maintain the original engineering specs of the system, ensuring optimal response times and long-term diagnostic accuracy in light commercial and industrial environments.

Key Benefits

• Ensures high-accuracy temperature monitoring with a 10K ohm thermistor designed to resist signal degradation.
• Includes a manual override button that allows for immediate occupancy schedule overrides at the zone level.
• Streamlines HVAC sensor installation using labeled screw terminals and a single TSP wire run for dual functionality.
• Provides a low-maintenance cooling and heating solution by eliminating the drift and frequent re-calibration required by mechanical thermostats.
• Specifically designed for commercial HVAC systems, maintaining compatibility across Carrier’s broader controls portfolio.

Common Questions

Does this sensor require a separate wire for the override button?
No, the 33ZCT55SPT is designed to share the zone temperature input. When the button is pressed, it momentarily shorts the internal thermistor, signaling the HVAC controller to initiate an override via the same wire pair.

How do I ensure the sensor is calibrated for my specific controller?
This Carrier space sensor is a precision-engineered 10K ohm thermistor. Because it is an electronic sensor rather than a mechanical thermostat, it does not require field calibration, which reduces the potential for technician error during commissioning.

Can this unit be mounted in a high-humidity environment?
The sensor is rated for 0% to 95% non-condensing relative humidity. For best results in commercial zones, ensure the wall cavity is sealed behind the temperature sensor to prevent false readings from unconditioned air infiltrating the junction box.

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.