In non-ATC systems, what does the ambient temperature switch primarily protect?

In non-automatic temperature control (non-ATC) systems, the ambient temperature switch primarily serves to protect the compressor from poor lubrication. This switch plays a critical role in monitoring the operating temperature of the compressor and helps ensure that the unit does not run in conditions that could lead to inadequate lubrication.

When the ambient temperature rises too high, potentially indicating a low refrigerant level or excessive load, the switch can activate a control mechanism to shut down the compressor. This is crucial because proper lubrication is vital for the compressor's operation; if the lubrication is insufficient, it can lead to increased wear and tear on the moving parts, ultimately resulting in compressor failure.

While the protection of the compressor does indirectly contribute to the overall integrity of the HVAC system, the primary focus of the ambient temperature switch is concerning the compressor's lubrication—ensuring effective operation and longevity of this critical component.