Air Conditioning Flashcards
6 cards from real NATE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Air Conditioning flashcards as text
What condition is indicated when an air conditioner's evaporator coil is heavily iced over?
Answer: Low airflow or low refrigerant charge
Restricted airflow or low refrigerant charge causes the evaporator to drop below freezing, leading to ice formation.
What is subcooling in an air conditioning system?
Answer: Number of degrees liquid refrigerant is cooled below its saturation temperature
Subcooling measures how many degrees the liquid refrigerant has been cooled below its condensing saturation temperature.
Which EPA section requires technicians to be certified before purchasing refrigerants?
Answer: Section 608
EPA Section 608 regulations require HVAC technicians to be certified when purchasing and handling refrigerants.
What is the purpose of the Schrader valve on a refrigeration system?
Answer: Provides a service port for pressure measurement and refrigerant access
Schrader valves are spring-loaded service ports that allow gauges and charging equipment to connect to the system.
A high-efficiency split system AC rated at SEER 18 performs better than a unit rated at which of the following?
Answer: SEER 16
SEER (Seasonal Energy Efficiency Ratio) measures cooling efficiency; higher numbers indicate better efficiency.
What does a low suction pressure reading typically indicate in a residential AC system?
Answer: Low refrigerant charge or restricted airflow
Low suction pressure usually points to insufficient refrigerant or reduced evaporator airflow causing lower evaporating temperatures.