What would be a common cause of evaporator icing?

Evaporator icing can occur due to several factors, each contributing to the cooling process being compromised. One common cause is low outdoor temperatures, which can lead to the refrigerant inside the evaporator coil dropping below freezing. This drop in temperature allows moisture in the air to condense on the coil and subsequently freeze, resulting in icing.

Additionally, moisture in the system itself can lead to icing. When there is excessive moisture present, it can condense on the evaporator coils and freeze, particularly if the temperature drops. This moisture could come from various sources, including leaks or insufficient system maintenance that fails to remove humidity effectively.

Dirty coils are another common cause of evaporator icing. When coils accumulate dirt and debris, they lose efficiency, leading to inadequate heat exchange. This inefficiency can cause the coils to drop below the freezing point, allowing moisture to freeze on their surface and create icing.

Each of these factors—low outdoor temperatures, moisture in the system, and dirty coils—can lead to sufficient icing in the evaporator, emphasizing that all are common causes of evaporator icing. This interconnectedness of causes reinforces the choice that recognizes them as contributing factors.