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
What is the minimum recommended vacuum level (microns) before closing service valves and charging a residential AC system?
Answer: 500 microns
Most manufacturers and industry standards require a vacuum of 500 microns or lower to ensure all moisture and non-condensables are removed.
When installing a split-system AC, the indoor air handler should be level or slightly tilted in which direction?
Answer: Tilted slightly toward the drain outlet
The air handler should pitch slightly toward the condensate drain outlet so gravity assists condensate removal and prevents pan overflow.
Which tool is used to flare the end of copper tubing for refrigerant line connections?
Answer: Flaring tool
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.
What is the purpose of installing a P-trap on a condensate drain line?
Answer: To prevent sewer gases from entering the unit
A P-trap creates a water seal that prevents sewer gases and odors from being drawn into the air handler through the drain line.
During a standing vacuum test, if micron gauge readings rise rapidly after the pump is isolated, this most likely indicates:
Answer: A leak in the system or connections
Rapid micron rise after pump isolation indicates a leak allowing air or moisture to enter the evacuated system.
What is the correct sequence for connecting refrigerant manifold gauges to a system?
Answer: Low-side blue hose to suction, high-side red hose to liquid/discharge, center yellow hose to refrigerant source
Standard manifold gauge protocol connects blue (low) to suction service port, red (high) to liquid/discharge port, and yellow center hose to refrigerant cylinder or vacuum pump.
When running refrigerant line sets through walls or floors, technicians must use:
Answer: Grommets or bushings to protect tubing from abrasion
Grommets or bushings protect copper refrigerant tubing from abrasion at wall penetrations, preventing wear-through that could cause leaks.