The refrigerated air dryer won't start; what could be the problem? There are many reasons why a refrigerated air dryer might fail to start, and we need to analyze and troubleshoot based on different situations. Below, we'll follow the steps below to troubleshoot each possibility.
1. Insufficient or excessive refrigerant: Repair leaks, vacuum the system, add sufficient refrigerant, or release excess refrigerant.
2. Internal leakage in the four-way valve, causing malfunction: Replace the valve after confirming damage.
3. Poor condenser ventilation or airflow short circuit: Remove obstructions on the outdoor side and clean the condenser.
4. Clogged capillary tube assembly (including filter): Increased suction temperature: Replace the capillary tube assembly.
5. Malfunction of the protection relay: Use a multimeter to check if its contacts are conductive when the air compressor is not hot. If not, replace the relay. When replacing the air compressor, check the starting capacitor and starting relay (if either is damaged, both must be replaced).
6. Malfunction of the air compressor itself, such as short circuit, open circuit, short circuit to casing, or grounding: Replace the air compressor after checking and confirming the problem.
7. Excessive high pressure: Pressure relay trips. Analyze the cause and troubleshoot accordingly.
8. The system contains non-condensable gases (such as air). Please evacuate and recharge.
9. The air compressor is operating at excessive current. Please identify and eliminate the cause.
10. The outdoor unit is exposed to excessively high ambient temperature. Please keep it away from heat sources and avoid direct sunlight.
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