When does an automatic compressor start?

An automatic compressor typically starts when there is an increase in suction pressure. This surge in pressure indicates that the system requires more refrigerant flow to meet the cooling demand. As the suction pressure rises, it signals the compressor to engage to manage the increased load, ensuring that the refrigeration cycle operates effectively. Maintaining proper suction pressure is critical for the balance and efficiency of the cooling system, as it directly affects how well the compressor can maintain the desired temperature.

While other factors influence compressor operation, such as refrigerant charging levels or thermostat settings, these do not inherently trigger the compressor's automatic startup. The engagement of the high-pressure cutout switch is a safety mechanism to prevent compressor operation when pressure exceeds safe limits but is not a standard signal for starting the compressor under normal operational conditions.