NATE AIR CONDITIONING
INSTALLATION & SERVICE PRACTICE
QUESTIONS AND ANSWER
ELABORATION
s A good evacuation of a refrigerant circuit to remove non-condensables will help insure:
A.) higher condensing temperatures
B.) higher suction pressures
C.) low suction line pressure drop
D.) higher efficiency and capacity - D.) higher efficiency and capacity
A condensing unit should be mounted on a slab that is level to:
A.) allow an accumulated water to evenly run out of the cabinet
B.) increase airflow through the fin area
C.) prevent the unit from tipping over
D.) make certain any top discharge air blows straight up - A.) allow any accumulated water to evenly run
out of the cabinet
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 - A.) liquid flood back to the compressor
Which of the following is the correct sequence of work?
A.) Attach the gauge manifold, recover refrigerant, replace the filter core, evacuate the system, recharge
the system.
, B.) Recover the refrigerant, evacuate the system, replace the filter core, recharge the system.
C.) Attach the gauge manifold, evacuate the system, replace the filter core, recover the refrigerant,
recharge the system.
D.) Attach the gauge manifold, recharge the system, evacuate the system, replace the filter core. - A.)
Attach the gauge manifold, recover refrigerant, replace the filter core, evacuate the system, recharge the
system.
As the pressure on the liquid line is increased, the vaporization temperature of the liquid:
A.) decreases
B.) increases
C.) remains unchanged
D.) varies - B.) increases
An oil separator must be mounted:
A.) level
B.) below the compressor crankcase
C.) above the compressor crankcase
D.) in the suction line - A.) level
Which of the following metering devices controls evaporator pressure?
A.) Thermostatic expansion valve
B.) Fixed orifice
C.) Low side float
D.) None of these - D.) None of these
The purpose of the external equalizer on the thermostatic expansion valve is:
A.) to equalize evaporator pressure drop with respect to the TEV
B.) to equalize the evaporator pressure drop
C.) to help prevent liquid flood back
INSTALLATION & SERVICE PRACTICE
QUESTIONS AND ANSWER
ELABORATION
s A good evacuation of a refrigerant circuit to remove non-condensables will help insure:
A.) higher condensing temperatures
B.) higher suction pressures
C.) low suction line pressure drop
D.) higher efficiency and capacity - D.) higher efficiency and capacity
A condensing unit should be mounted on a slab that is level to:
A.) allow an accumulated water to evenly run out of the cabinet
B.) increase airflow through the fin area
C.) prevent the unit from tipping over
D.) make certain any top discharge air blows straight up - A.) allow any accumulated water to evenly run
out of the cabinet
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 - A.) liquid flood back to the compressor
Which of the following is the correct sequence of work?
A.) Attach the gauge manifold, recover refrigerant, replace the filter core, evacuate the system, recharge
the system.
, B.) Recover the refrigerant, evacuate the system, replace the filter core, recharge the system.
C.) Attach the gauge manifold, evacuate the system, replace the filter core, recover the refrigerant,
recharge the system.
D.) Attach the gauge manifold, recharge the system, evacuate the system, replace the filter core. - A.)
Attach the gauge manifold, recover refrigerant, replace the filter core, evacuate the system, recharge the
system.
As the pressure on the liquid line is increased, the vaporization temperature of the liquid:
A.) decreases
B.) increases
C.) remains unchanged
D.) varies - B.) increases
An oil separator must be mounted:
A.) level
B.) below the compressor crankcase
C.) above the compressor crankcase
D.) in the suction line - A.) level
Which of the following metering devices controls evaporator pressure?
A.) Thermostatic expansion valve
B.) Fixed orifice
C.) Low side float
D.) None of these - D.) None of these
The purpose of the external equalizer on the thermostatic expansion valve is:
A.) to equalize evaporator pressure drop with respect to the TEV
B.) to equalize the evaporator pressure drop
C.) to help prevent liquid flood back
