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The correct threshold for temperature readings taken on the refrigerant discharge line, specifically 6 inches from the compressor, is critical for ensuring the proper functionality and safety of the HVAC system. If the temperature exceeds 225°F, it could lead to overheating, which may cause damage to the compressor and other components in the system. High temperatures can also indicate that the refrigerant may be running improperly, leading to decreased efficiency and potential system failure.

Monitoring the discharge line temperature is essential because it helps identify issues such as too high a refrigerant charge, air infiltration, or refrigerant leak problems. Staying below this temperature helps maintain the integrity and longevity of the system, ensuring it operates effectively and efficiently. Therefore, the stated limit of 225°F serves as a safeguard against these risks, and ensuring temperatures remain within safe boundaries promotes optimal performance and system reliability.