Air Conditioning Repair Installation and Evacuation Procedures 2

Question 1

What is the minimum recommended vacuum level (microns) before closing service valves and charging a residential AC system?

Accepted Answer

500 microns

Answer

Most manufacturers and industry standards require a vacuum of 500 microns or lower to ensure all moisture and non-condensables are removed.

Question 2

When installing a split-system AC, the indoor air handler should be level or slightly tilted in which direction?

Accepted Answer

Tilted slightly toward the drain outlet

Answer

The air handler should pitch slightly toward the condensate drain outlet so gravity assists condensate removal and prevents pan overflow.

Question 3

Which tool is used to flare the end of copper tubing for refrigerant line connections?

Accepted Answer

Flaring tool

Answer

A flaring tool is used to create a conical flare on the end of copper tubing that mates with flare fittings for leak-free refrigerant connections.

Question 4

What is the purpose of installing a P-trap on a condensate drain line?

Accepted Answer

To prevent sewer gases from entering the unit

Answer

A P-trap creates a water seal that prevents sewer gases and odors from being drawn into the air handler through the drain line.

Question 5

During a standing vacuum test, if micron gauge readings rise rapidly after the pump is isolated, this most likely indicates:

Accepted Answer

A leak in the system or connections

Answer

Rapid micron rise after pump isolation indicates a leak allowing air or moisture to enter the evacuated system.

Air Conditioning Repair Practice Test