Why does American Standard AC experience refrigerant flow restriction?

 
Refrigerant Contamination and Debris
 

• The refrigerant circuit in American Standard AC units can become contaminated with particles, moisture, or oil. These contaminants may be introduced during installation, servicing, or from wear and tear, and eventually accumulate to partially block the refrigerant flow.
• Debris in the system can form deposits inside the tubing and components, limiting the free movement of the refrigerant and reducing overall system efficiency.

 
Faulty or Misadjusted Expansion Valve
 

• The expansion valve is critical in regulating the flow of refrigerant between the high-pressure and low-pressure sides of the system. If it malfunctions or is misadjusted, it can cause a restricted flow.
• An improperly functioning expansion valve may remain partially closed, leading to an inadequate amount of refrigerant entering the evaporator, thus impairing cooling performance.

Service providers in St. Louis have observed that issues with refrigerant flow can be subtle yet have a significant impact on overall system performance.

 
Design and Installation Issues
 

• The inherent design or installation practices sometimes create conditions that promote refrigerant flow restrictions. For example, overly long or too narrow refrigerant lines, sharp bends, or poorly routed piping can increase resistance.
• Errors during system installation can introduce kinks or even oil slugging that may obstruct the intended refrigerant pathways, further hampering performance.

 
Improper Refrigerant Charge
 

• A refrigerant charge that is either too low or too high can disturb the pressure balance within the system. An incorrect charge can lead to operational inefficiencies that simulate a flow restriction.
• An undercharged system may not achieve the proper pressure differential required for optimal expansion valve operation, while an overcharged system can induce higher pressures that lead to restrictions in some areas.

 
Lack of Regular Maintenance
 

• Regular maintenance is crucial for ensuring all components are clean and free from potential obstructions. Neglected parts, such as clogged filter driers and dirty coils, can accumulate contaminants that promote flow restriction.
• Without periodic servicing, any minor issues such as corrosion or particulate buildup become significant over time, leading to increased resistance and compromised refrigerant circulation.

Many commercial and residential clients in St. Louis benefit from routine maintenance to avoid the complications associated with cooling system inefficiencies.