Products Description
| Product Name | Carrier AD-718-704 Potentiometer |
| Model | AD-718-704 |
| Applicable Industries | Construction and Commercial |
| Application | Refrigeration compressor |
| Packaging | Cardboard Box |
| MOQ | 1 Piece |
Product Fault Symptoms:
Main controller frequently reports IGV position feedback faults; unit load is limited and capacity reduced.
Carbon film wear and poor brush contact cause the deviation between feedback voltage and commanded opening to exceed limits, locking the unit’s output.
Guide vane adjustment jitters; cooling capacity and outlet water temperature fluctuate significantly.
Intermittent potentiometer signal spikes cause the actuator to oscillate repeatedly; load becomes unstable, and unit power consumption rises.
Impact against full-open/full-close limit stops; actuator motor overheats due to overload.
Shaft slippage and distorted travel detection cause the actuator to drive continuously against mechanical limits, burning out the IGV drive motor.
Guide vanes fail to close fully automatically after unit shutdown; risk of liquid hammer increases.
Lack of a valid opening signal prevents the main controller from identifying vane position, and the fail-safe spring fails to close the vanes precisely.
Wiring harness short-circuit burns out main controller I/O input ports.
Damaged wiring shorts to ground within the 5V signal circuit, significantly increasing repair costs for the PIC main control board.
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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, Yk, 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. |
Core Product Functions:
1. Real-time feedback monitoring of IGV (Inlet Guide Vane) mechanical opening (Core Function)
Synchronously captures the actual opening angle of the compressor’s inlet guide vanes and converts it into a standard analog voltage signal for transmission to the main controller; this serves as the core feedback component for the unit’s stepless capacity regulation.
2. Precise load matching and stable operating parameters
Based on the opening angle feedback from the potentiometer, the main controller coordinates with the IGV actuator to adjust inlet airflow, matching the cooling load at the terminal, stabilizing evaporation and condensation pressures, and reducing the unit’s power consumption.
3. Fault diagnosis and protection for IGV zero-point and travel limits
The main controller compares the commanded opening angle with the actual feedback from the potentiometer in real time; if the deviation exceeds limits, it identifies issues such as IGV mechanism jamming or potentiometer failure, triggering a fault-based load-limiting shutdown to protect the compressor and actuator motor.
4. Automatic full closure of guide vanes during fault shutdown to reduce liquid hammer risk
During power loss or fault conditions, the main controller identifies the guide vane position via the potentiometer and works with the actuator’s spring mechanism to fully close the vanes, thereby minimizing the impact of liquid refrigerant backflow on the rotor.
5. Shielded anti-interference design to eliminate electronic control signal distortion
Shielded wiring harnesses isolate electromagnetic interference from the compressor and variable frequency drive (VFD), preventing signal drift and random false alarms.
