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 correct sequence for recovering refrigerant from a system before a major repair?
Answer: Recover refrigerant, then repair, then recharge
EPA Section 608 requires recovering refrigerant before opening the system; after repairs, the system is then evacuated and recharged.
A condensate drain line is routed through an unconditioned attic. What additional measure is required by most building codes?
Answer: Insulate the drain line to prevent sweating and dripping
Uninsulated condensate drain lines in hot unconditioned spaces can sweat and drip, causing water damage and mold — insulation prevents this.
When setting up a manifold gauge set on an R-410A system, the technician should use hoses rated for at least:
Answer: 800 psi working pressure
R-410A operates at pressures roughly 60–70% higher than R-22; hoses rated at 800 psi working pressure (4,000 psi burst) are the minimum standard.
A technician installs a new 2-ton split system and finds the existing ductwork was designed for a 1.5-ton system. What is the most likely result?
Answer: Higher static pressure, reduced airflow, poor efficiency and comfort
Undersized ductwork increases external static pressure, restricts airflow, reduces system efficiency, and can cause the evaporator coil to freeze.
What is the purpose of an access port Schrader valve core removal tool during service?
Answer: To allow full-flow refrigerant access without restricting flow through the valve core
Removing the Schrader core allows unrestricted flow for faster recovery and more accurate pressure readings, as the core itself creates flow restriction.
After replacing a compressor, what maintenance item is most critical before recharging the system?
Answer: Replace the filter drier
Compressor burnout releases acids and contaminants into the refrigerant circuit; a new filter drier removes these contaminants to protect the replacement compressor.
When installing a condensing unit on a rooftop, which mounting concern is most important for long-term reliability?
Answer: The unit must be level to ensure proper compressor oil lubrication
A level condensing unit ensures the compressor crankcase maintains proper oil level for lubrication; an unlevel unit can cause oil to pool away from the oil pickup.