Commercial Refrigeration Systems 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 Commercial Refrigeration Systems flashcards as text
In a commercial walk-in cooler, which component is responsible for removing heat from the refrigerated space?
Answer: Evaporator coil
The evaporator coil absorbs heat from the refrigerated space, causing refrigerant to evaporate and cool the air inside.
What is the purpose of a liquid-line filter drier in a commercial refrigeration system?
Answer: Remove moisture and contaminants from refrigerant
A liquid-line filter drier removes moisture, acid, and solid contaminants that could damage system components or cause ice blockages.
A commercial refrigeration system shows high discharge pressure but normal suction pressure. The most likely cause is:
Answer: Dirty or fouled condenser
A dirty or fouled condenser restricts heat rejection, causing discharge pressure to rise while suction pressure remains normal.
Which EPA Section 608 refrigerant handling practice is required when opening a commercial refrigeration system for repair?
Answer: Recover refrigerant to required levels before opening
EPA Section 608 requires technicians to recover refrigerants to specified levels before opening any system containing CFCs, HCFCs, or HFCs.
What does superheat at the evaporator outlet indicate in a properly operating commercial refrigeration system?
Answer: Refrigerant vapor is warmer than its saturation temperature
Superheat at the evaporator outlet means the refrigerant vapor temperature exceeds its saturation temperature, ensuring only dry vapor enters the compressor.
A commercial refrigeration rack system uses multiple compressors in parallel primarily to:
Answer: Allow capacity modulation and redundancy
Multiple parallel compressors allow the rack to stage capacity up or down based on load demand and provide redundancy if one compressor fails.
When leak checking a commercial refrigeration system after repair, which method is preferred to avoid introducing moisture?
Answer: Dry nitrogen pressure test with electronic leak detector
Dry nitrogen is inert, moisture-free, and safe for leak testing; an electronic detector then locates the exact leak site without contaminating the system.