System Charging & Evacuation Flashcards
7 cards from real CFC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 System Charging & Evacuation flashcards as text
What is the purpose of performing a standing vacuum test after evacuation?
Answer: To confirm the system holds vacuum with no leaks or moisture present
A standing vacuum test isolates the system from the pump and monitors the micron reading over time to verify the absence of leaks and significant moisture.
When must a technician use recovery equipment before opening a CFC or HCFC system for repair?
Answer: Always, regardless of charge size, when the system contains a regulated refrigerant
EPA Section 608 requires refrigerant recovery before opening any system containing a regulated refrigerant, regardless of the charge size.
A technician charges a split system by subcooling method. What measurement is needed to calculate the correct charge?
Answer: Liquid line temperature and liquid line saturation pressure/temperature
The subcooling method requires measuring the liquid line temperature and comparing it to the saturation temperature at the liquid line pressure to calculate actual subcooling.
What color are DOT-approved recovery cylinders painted to distinguish them from refrigerant supply cylinders?
Answer: Gray with a yellow collar
Recovery cylinders are standardized with a gray body and yellow collar (top) to distinguish them from manufacturer supply cylinders.
Which of the following would cause a system to be overcharged after a charging-by-superheat procedure?
Answer: The indoor unit filter was heavily clogged during charging
A clogged filter reduces airflow across the evaporator, artificially raising superheat readings and causing the technician to add excess refrigerant.
Under EPA Section 608, technicians who violate refrigerant venting prohibitions are subject to fines of up to how much per day per violation?
Answer: $44,539
EPA Section 608 violations can result in civil penalties of up to $44,539 per day per violation (periodically adjusted for inflation).
What is the recommended minimum hose length when connecting a vacuum pump to minimize the effect of hose volume on evacuation time?
Answer: Use the shortest possible hoses to reduce system volume and speed evacuation
Shorter, large-diameter hoses reduce internal volume and flow resistance, allowing the vacuum pump to evacuate the system faster and to a deeper level.