Heavy Duty Equipment Technician Red Seal Exam Prep · Question
After performing an A/C system evacuation with an approved vacuum pump, a technician isolates the system and observes that the vacuum pressure rises from -98 kPa (-28.9 inHg) to -70 kPa (-20.7 inHg) over a 15-minute period. What does this observation indicate?
A vacuum decay test, where the system is isolated after evacuation and monitored for pressure rise, is a critical step to identify leaks. If the vacuum pressure
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Question: After performing an A/C system evacuation with an approved vacuum pump, a technician isolates the system and observes that the vacuum pressure rises from -98 kPa (-28.9 inHg) to -70 kPa (-20.7 inHg) over a 15-minute period. What does this observation indicate?
Answer options: ✅ There is a refrigerant leak in the system.
- Residual moisture is boiling off within the system.
- The vacuum pump is faulty and not achieving a deep enough vacuum.
- The manometer used for measurement needs recalibration.
Correct answer: There is a refrigerant leak in the system.
Explanation: A vacuum decay test, where the system is isolated after evacuation and monitored for pressure rise, is a critical step to identify leaks. If the vacuum pressure rises significantly and stabilizes above the desired deep vacuum level after isolation, it strongly indicates the presence of a leak allowing atmospheric pressure into the system.
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