What does a temperature differential across a filter dryer typically indicate?

A temperature differential across a filter dryer indicates that there is a difference in temperature between the inlet and outlet sides of the filter dryer. This differential is a significant diagnostic tool in HVAC systems. When this differential is larger than expected, it typically points to a restriction within the filter dryer.

In a functioning system, the temperature on the outlet side should be relatively close to the inlet side, indicating that refrigerant is flowing freely and that heat exchange is normal. However, if there is a substantial difference, it suggests that the filter dryer is clogged or restricted, preventing the normal flow of refrigerant and causing a buildup of pressure. This restriction could lead to decreased system efficiency and could eventually result in system failure if not addressed. Understanding this concept is crucial for maintaining HVAC systems and ensuring they operate within safe and efficient parameters.