Nate ac stuvia 2024 - Study guides, Class notes & Summaries

A system is supplied from the factory with charge of 5 pounds 10 ounces for a 15 foot line set. The line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant line set length. What is the total refrigerant charge for the system? A. 6 ounces B. 5 pounds C. 5 pounds 10 ounces D. 6 pounds - ANSWERD. 6 pounds 15ft - 25ft = 10ft x .6 = 6 ounces 5 pounds + 10 ounces + 6 ounces 5 pounds + 16 ounces =...

The Fahrenheit scale is based on boiling water at sea level at what temperature? A: 459 degrees B: 212 degrees C: 180 degrees D: 100 degrees - ANSWERB: 212 degrees Zero pounds gauge corresponds on the absolute scale to: A: 144 B: 212 C: 14.7 D: zero - ANSWERC: 14.7 Hidden heat in refrigeration work is referred to as: A: Intensity of heat B: Latent heat C: Heat a thermometer can "sense" D: Cold - ANSWERB: Latent heat Absol...

Low airflow over a residential split system air conditioning evaporator can cause A: Liquid flood-back to the compressor B: A decrease in compression ratio C: An increase in suction line superheat D: Oil logging in the evaporator - ANSWERA: Liquid flood-back to the compressor Which of the following is the correct sequence of work? A: Attach gauge manifold, recover refrigerant, replace filter core, evacuate the system, recharge the system. B: Recover refrigerant, ev...

During an annual service check up, it is discovered that there is a moderate amount of resistance on a "bellyband" crankcase heater. What does this condition indicate? A. the crankcase heater will operate B. the crankcase heater will not operate C. the crankcase heater is open D. the crankcase heater voltage must be increased for proper operation - ANSWERA. the crankcase heater will operate High superheat is a symptom of: A. a system overcharge B. a clogged air filter C. a bl...

A technician has determined a supply in a flexible duct system is leaking. What should be checked? - ANSWERAll connections inner and outer layers. Electronic air cleaners can operate with internal voltages as high as? - ANSWER5000v Why do some electromechanical type thermostats require connections to both the hot side and common side of the low voltage transfromer - ANSWERDisplay lights must be powered using both sides of the line the continuity reading on a functional fuse will be - AN...

A system is supplied from the factory with a charge of 5 pounds 10 ounces for a 15 foot line set. The line set is 25 feet long. The manufacturer's instruction sheet specifies 0.6 ounces of refrigeration to be added for each added foot of refrigerant line set length. What is the total refrigerant charge for the system? A. 6 ounces B. 5 pounds C. 5 pounds 10 ounces D. 6 pounds - ANSWERD. 6 pounds 25ft - 15ft = 10ft 10ft x .6 = 6 ounces 5 pounds + 10 ounces + 6 ounces 5 pounds + 16...