Air Conditioning Repair Installation and Service Procedures 3

Question 1

What is the correct sequence for recovering refrigerant from a system before a major repair?

Accepted Answer

Recover refrigerant, then repair, then recharge

Answer

EPA Section 608 requires recovering refrigerant before opening the system; after repairs, the system is then evacuated and recharged.

Question 2

A condensate drain line is routed through an unconditioned attic. What additional measure is required by most building codes?

Accepted Answer

Insulate the drain line to prevent sweating and dripping

Answer

Uninsulated condensate drain lines in hot unconditioned spaces can sweat and drip, causing water damage and mold — insulation prevents this.

Question 3

When setting up a manifold gauge set on an R-410A system, the technician should use hoses rated for at least:

Accepted Answer

800 psi working pressure

Answer

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.

Question 4

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?

Accepted Answer

Higher static pressure, reduced airflow, poor efficiency and comfort

Answer

Undersized ductwork increases external static pressure, restricts airflow, reduces system efficiency, and can cause the evaporator coil to freeze.

Question 5

What is the purpose of an access port Schrader valve core removal tool during service?

Accepted Answer

To allow full-flow refrigerant access without restricting flow through the valve core

Answer

Removing the Schrader core allows unrestricted flow for faster recovery and more accurate pressure readings, as the core itself creates flow restriction.

Air Conditioning Repair Practice Test

Air Conditioning Repair Practice Test

Air Conditioning Repair Installation and Service Procedures 3