HVAC EXCELLENCE Exam (New 2026/ 2027
Update) Questions & Answers {Grade A}
100% Correct (Verified Solutions)
When topping off an operating system containing a blended refrigerant - Correct
answer introduce the refrigerant a a liquid into the low side using a throttling valve.
A partially clogged capillary tube metering device can cause - Correct answer a
starved evaporator
The R134-A high pressure gauge reads 146 psig and the liquid line temp. At the
condensing unit is 95 degrees faranheit, what is the operating subcooling - Correct
answer 15 degrees faranheit
An overcharge of refrigerant will cause - Correct answer increased head pressure
A drain trap should be installed on a split system when the - Correct answer Air
handler drain is on the negative side
,A customer complains that their AC system is running constantly, but not cooling
enough. The suction line is very colde and the compressor is sweating. Mostlikely
cause is - Correct answer a restriction of the return air or dirty evaporator
What is the generally accepted range for evaporator air flow in cfms per ton of
residential air conditioning? - Correct answer 350 to 450
Split system with Compressor change out, unit is not cooling. Evaporator seems
starved, liquid line is sweating leaving the drier, mostlikely - Correct answer Debris
from the burned out compressor has clogged the filter drier
The temperature rise method for determining air flow is - Correct answer CFM=BTU /
(1.08 x Delta T)
What is the recomended residential indoor relative humidity for summer? - Correct
answer 50%
, An inefficient compressor is usually indicated by ___ headpressure and ___ suction
pressure - Correct answer Lower than normal/ higher than normal
Which is NOT a symptom of a hermetic system that is low on refrigerant - Correct
answer High head pressure
Frost on the suction line indicates - Correct answer That the temp. Is below the dew
point and below 32 degrees F.
An increase in head pressure causes __ refrigerant to flow through a capillary tube -
Correct answer More
With an automatic expansion valve, an increase in evaporator load will cause the -
Correct answer Automatic expansion valve to open
When a TEV or a capillary tube is used as a metering device a low refrigerant charge
will cause - Correct answer low head pressure
Update) Questions & Answers {Grade A}
100% Correct (Verified Solutions)
When topping off an operating system containing a blended refrigerant - Correct
answer introduce the refrigerant a a liquid into the low side using a throttling valve.
A partially clogged capillary tube metering device can cause - Correct answer a
starved evaporator
The R134-A high pressure gauge reads 146 psig and the liquid line temp. At the
condensing unit is 95 degrees faranheit, what is the operating subcooling - Correct
answer 15 degrees faranheit
An overcharge of refrigerant will cause - Correct answer increased head pressure
A drain trap should be installed on a split system when the - Correct answer Air
handler drain is on the negative side
,A customer complains that their AC system is running constantly, but not cooling
enough. The suction line is very colde and the compressor is sweating. Mostlikely
cause is - Correct answer a restriction of the return air or dirty evaporator
What is the generally accepted range for evaporator air flow in cfms per ton of
residential air conditioning? - Correct answer 350 to 450
Split system with Compressor change out, unit is not cooling. Evaporator seems
starved, liquid line is sweating leaving the drier, mostlikely - Correct answer Debris
from the burned out compressor has clogged the filter drier
The temperature rise method for determining air flow is - Correct answer CFM=BTU /
(1.08 x Delta T)
What is the recomended residential indoor relative humidity for summer? - Correct
answer 50%
, An inefficient compressor is usually indicated by ___ headpressure and ___ suction
pressure - Correct answer Lower than normal/ higher than normal
Which is NOT a symptom of a hermetic system that is low on refrigerant - Correct
answer High head pressure
Frost on the suction line indicates - Correct answer That the temp. Is below the dew
point and below 32 degrees F.
An increase in head pressure causes __ refrigerant to flow through a capillary tube -
Correct answer More
With an automatic expansion valve, an increase in evaporator load will cause the -
Correct answer Automatic expansion valve to open
When a TEV or a capillary tube is used as a metering device a low refrigerant charge
will cause - Correct answer low head pressure
