WorksheetsHVAC 2
Total questions: 21
Worksheet time: 13mins
Customer states: AC not blowing cold. Gauges read 0 pressure on Both High and Low Side. What should be done next?
Check Fuses
Check Power and Ground at Compressor
Vacuum and Leak Test
Replace Valves
Replace Valve Caps
Compressor is cycling on and off. There is pressure in both High and Low side. Resting pressures are lower than normal. What should be done next?
Recover Refrigerant then Charge the right amount of Refrigerant
Replace valves
Replace Compressor
Check Fuses
Vacuum
The correct name of the Valve Core:
Poppet Valve
Piston Valve
Zerk Valve
Schrader Valve
Stem Fitting
Tech A says: The high side line is larger in diameter than the Low side line. Tech B says: The low side service port is larger than the High side service port. Who is correct?
Tech A
Tech B
Both Tech A and B
Neither A nor B
The system has lost all Refrigerant, But the leak test passed. What should be done next?
Replace Valves
Check Fuses
Vacuum
Charge
Recover
A CFC Refrigerant:
R134a
R-12
R1234yf
All of the Above
HFC:
Hydrofluorocarbon
Hyperflexcompatible
Hexifluidcarbon
Hyrdofreoncompatible
Hypofluidcombustible
CFC:
Chlorofluidcarbon
Chlorofluorocarbon
CarolinaFriedChicken
Carbonfluorocarbide
Compressor not engaging. Gauges showing pressure at 60 psi on both High and Low side. Fuses check out as good. What should be done next?
Check Power and ground at Compressor
Recover
Charge .5 pound
Charge 1.5 pounds
Vaccum and Leak Test
Compressor came on for a few seconds then shut off when the High Side pressure got Too High. What could be a possible cause?
Clog in the Expansion Valve
Bad Expansion Valve stuck in the Closed position
Bad Receiver/Dryer resulting in desiccant pellets clogging the High side line.
All of the Above
None of the Above
Low pressure liquid enters the evap and it exits as a:
High Pressure Gas
High pressure liquid
Low pressure gas
Low pressure liquid
What are the two units of pressure measurement used in HVAC?
Kpi/Joules
Psi/Kpa
Kpa/Calories
BTU/Psi
Psi/InHg
Please Spell out CFC:
(a)
True or False: When you replace Schrader valves... The o-rings need to be kept dry to ensure a better seal.
True
False
What is used to boil water from inside the AC system?
(a)
Ambient Temp is 79 degrees. Resting Pressures are 120 psi on both Low and High Side. What is most likely the problem?
System Undercharged
Low Side Pressure switch Inop
System Overcharged
Evap Dirty
Refrigerant Leak
When doing a Performance test: What determines if the system is working within range?
If the middle vent is reading below 50 degrees F
If water is dripping from the Evap
If the gauges are reading 30 degrees below ambient temperature
If the middle vent is reading 30 degrees below ambient temp.
If the gauges are reading below 30 psi on the Low side and 200 on the High side
134a is what type of refrigerant?
(a)
1234yf is a :
Hydroaerofluoride
HydroFlourohydride
RED TEK 12a
hydrocarbon refrigerant blend
Absorbs moisture, essentially acting as a drying agent:
(a)
The process of breaking down a liquid into a fine spray of droplets or particles
(a)
