In a vending machine with low suction pressure and low motor amp draw, what could cause these issues after a filter drier replacement?

The scenario describes issues of low suction pressure and low motor amp draw in a vending machine after a filter drier replacement. The choice indicating that the replacement filter drier is larger than the original is particularly pertinent because using a filter drier that is oversized can lead to improper refrigerant flow and turbulence within the system.

An oversized filter drier may not allow for the necessary amount of refrigerant to pass through effectively, essentially causing a restriction in the line. This restriction can ultimately lead to low suction pressure, as the refrigerant may not be circulating adequately to absorb heat from the environment, which can also contribute to a reduction in motor amp draw since the compressor may not be operating efficiently or may be running under lower load conditions. A properly sized filter drier is crucial for maintaining optimal refrigerant flow and ensuring that the system operates within its intended parameters.

In contrast, excessive oil in the system or extreme ambient temperatures can influence performance, but they don't specifically address the immediate issues related to a filter drier replacement as directly as the size discrepancy does. Therefore, the focus on the size of the filter drier is crucial for understanding the symptom of low suction pressure and low amp draw in the context of this repair.