Installation and Evacuation Procedures Flashcards
7 cards from real Air Conditioning Repair practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Installation and Evacuation Procedures flashcards as text
A dual-stage vacuum pump should have its oil changed:
Answer: After each use or when the oil appears dark and contaminated
Vacuum pump oil absorbs moisture during system evacuation and should be changed after every use to maintain the pump's ability to achieve deep vacuums.
What is the correct refrigerant line sizing rule regarding the suction line versus the liquid line?
Answer: The suction line is always larger in diameter than the liquid line
Suction line carries low-pressure vapor (low density) and must be larger diameter than the liquid line to maintain proper refrigerant velocity and oil return.
When an AC outdoor unit is installed on a rooftop, the mounting platform must:
Answer: Be structurally rated for the unit weight and allow for vibration isolation
Rooftop installations require structurally adequate, properly rated supports with vibration isolation pads to protect both the unit and the roof structure.
Which EPA regulation governs the handling and recovery of refrigerants during AC service and installation?
Answer: Section 608 of the Clean Air Act
EPA Section 608 prohibits venting refrigerants and requires certified technicians to use approved recovery equipment during service, maintenance, and installation.
What is 'triple evacuation' (also called 'three-step evacuation') used for?
Answer: Removing moisture more effectively by breaking vacuum with dry nitrogen between pulls
Triple evacuation involves pulling vacuum, breaking with dry nitrogen, then repeating twice more — each cycle draws out more moisture than a single long pull.
The condensate drain line for a horizontal air handler installed in an attic should include:
Answer: A secondary drain pan with a separate overflow drain or safety switch
Attic-installed air handlers require a secondary condensate pan with drain or float switch to prevent ceiling water damage if the primary drain clogs.
When installing a ductless mini-split, the wall sleeve (line set hole) should be drilled at a slight downward angle toward the outside to:
Answer: Allow condensate from the wall sleeve area to drain outdoors
A slight downward pitch toward the exterior ensures any water that enters the wall sleeve hole drains outward rather than into the structure.