Installation and Service 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 Service Procedures flashcards as text
What is the minimum required clearance between a condensing unit and a wall or fence on the service side?
Answer: 24 inches
ACCA and most manufacturer specifications require at least 24 inches of clearance on the service side of a condensing unit for proper airflow and technician access.
When installing a new evaporator coil, what should be done to the existing refrigerant metering device?
Answer: Replace it with the OEM-matched device supplied with the coil
The metering device must be matched to the new coil's specifications; the OEM-supplied device ensures proper refrigerant distribution and system efficiency.
Which tool is used to ensure refrigerant line sets are properly supported and do not transmit vibration into the building structure?
Answer: Vibration isolation hangers
Vibration isolation hangers absorb compressor vibration and prevent it from being transmitted through copper lines into walls and ceilings.
What is the purpose of trapping the suction line at the base of a vertical rise when the evaporator is located above the condensing unit?
Answer: To prevent oil from draining back and flooding the compressor during off cycles
An oil trap at the base of a suction line riser ensures oil circulates back to the compressor and does not accumulate in the low point of the line.
A technician is installing a split system where the line set run is 75 feet — 25 feet longer than the manufacturer's standard. What adjustment is typically required?
Answer: Add refrigerant charge per the manufacturer's extended line set table
Manufacturers publish refrigerant add-per-foot tables for line sets longer than the tested standard length to compensate for the additional volume.
When brazing copper refrigerant lines, nitrogen should be flowing through the lines at what approximate pressure?
Answer: 2–5 psig
A low nitrogen purge of 2–5 psig displaces oxygen inside the tubing to prevent copper oxide scale formation without blowing out the brazing alloy.
During a new system startup, the technician measures superheat at 5°F on a fixed-orifice system. What does this indicate?
Answer: The system is overcharged
Very low superheat (below the target of ~10°F on most fixed-orifice systems) indicates an overcharge, which risks liquid refrigerant entering the compressor.