What happens when the contactor is energized and there is 220V on the input side but only 110V on the load side?

When the contactor is energized and shows a discrepancy in voltage between the input side and the load side, specifically having 220V on the input side but only 110V on the load side, this typically indicates that there is an obstruction or problem with the contacts within the contactor.

When the contacts of a contactor are not fully engaging due to dirt, corrosion, or physical damage, they can result in a high resistance connection. This high resistance can cause a significant drop in voltage across the load side, preventing the necessary voltage from reaching the compressor or other connected components. As a result, the load may not operate properly, leading to performance issues such as under-voltage conditions that can damage equipment or lead to inefficiency.

In this scenario, it's vital to inspect the contactor to determine if there is an obstruction such as debris or wear that is preventing it from making a proper connection. Regular maintenance and checks of the contactor's contacts play a crucial role in ensuring optimal performance of the air conditioning system.