Products Description
| Product Name | Carrier HH79NZ031 Temperature Sensor |
| Model | HH79NZ031 |
| Applicable Industries | Construction and Commercial |
| Application | Refrigeration compressor |
| Packaging | Cardboard Box |
| MOQ | 1 Piece |
Core Product Functions:
Precise Acquisition and Display of Chilled/Cooling Water Temperatures
The probe is inserted into a thermowell for direct contact with the water, continuously monitoring supply and return temperatures. Real-time display on the control panel provides the baseline for the master PID logic, which modulates the compressor slide valve or inlet guide vanes (0–100% load) to stabilize the leaving water temperature.
Anti-Freeze Safety Interlock
If the water temperature drops below the anti-freeze threshold, a sudden change in sensor resistance triggers the unit’s anti-freeze protection. This locks out the compressor and activates pipeline heat tracing to prevent the water circuit from freezing and bursting during winter.
Auxiliary Logic for Water Flow Fault Detection
If the temperature difference between supply and return water is abnormal or the temperature remains unchanged for an extended period, the mainboard cross-references the water flow switch status to detect pump stoppage or circuit blockages, triggering a water flow fault alarm.
Superheat Stabilization via Electronic Expansion Valve (EEV) Coordination
In water-cooled screw units, the system coordinates with high- and low-pressure sensors to control ETS-series electronic expansion valves. This precisely regulates refrigerant flow, preventing evaporator icing and compressor liquid hammer (and associated noise).
Rapid Fault Self-Diagnosis and Reporting
The controller detects anomalies—such as open circuits, short circuits, or resistance values outside the standard range—and reports a water temperature sensor fault. The unit then shuts down (or limits load) and allows for rapid identification of wiring or probe failures.
Immersion-Type Temperature Sensing with Superior Accuracy
The probe is directly immersed in the water, eliminating thermal conduction losses caused by pipe-wall scale. This ensures higher temperature measurement accuracy, meeting the high-precision control requirements of large-scale centrifugal and water-cooled screw chillers.
Tags: Carrier chiller spare parts Carrier Temperature Sensor central chiller maintenance spare part Chiller temperature probe commercial air conditioning replacement sensor compressor control accessory cooling system monitoring component HH79NZ031 HVAC temperature detector industrial refrigeration temperature transducer refrigerant pipeline temperature fitting refrigeration system temperature module
Technical parameter
Company Profile
Factory Profile
| Q1:For refrigeration industry, which brands are your products covering? | A1:We produce filter element replacements for brands like,Bitzer, Carrier, York, McQuay, Trane, etc… |
| Q2:Does the price include freight? | A2:The quotation is usually the factory price. We can recommend the most economical logistics plan and calculate the freight according to your destination and quantity. |
| Q3:How to ensure product quality? | A3:We have a strict quality control process, and we will carry out multiple inspections before the products leave the factory to ensure that they meet the standards. |
| Q4:Why choose us? | A4:Product reliability: We are a professional manufacturer . can offer high-quality products at the most competitive prices. Technical support: We provide technical assistance. Industry experience: We have over 10 years of experience in the refrigeration equipment service field. After-sales service: We offer professional after-sales service. Team collaboration: We have a professional team that can provide you with prompt services and delivery schedules. |
Typical product failure symptoms:
The unit reports a water temperature sensor fault immediately upon power-up; the temperature reading on the panel resets to zero, freezes, or drifts significantly.
Inaccurate water temperature readings; the unit locks out or shuts down prematurely before reaching the anti-freeze temperature threshold, or fails to trigger anti-freeze protection in low-temperature conditions.
Scale buildup on the probe rod causes severely high or low temperature readings, resulting in insufficient cooling capacity and failure to meet outlet water temperature targets.
Wiring harness insulation melts due to high heat, causing internal wire breakage; multimeter testing shows no complete resistive circuit.
Damaged shielding layer causes continuous temperature reading fluctuations and erratic load regulation during inverter operation.
NTC sensor element aging causes resistance values to deviate from the standard 10kΩ curve, leading to frequent load limiting and evaporator icing.
