NOCTI HVAC STUDY GUIDE
CERTIFICATION REVIEW SET 2026
ANSWERS GUARANTEED PASS
⫸ when putting out a fire involving oily rags use a ________ fire
extinguisher? Answer: Class B
⫸ The best tool to open and close the stem access valve on a
refrigeriation system is the_______ Answer: Refrigeration service
wrench
⫸ Which power tool is best to cut steel rod? Answer: Sawzall
⫸ CSST (steal tubing) connections Answer: can be used with both
natural and propane gas equipment
⫸ The type of pipe commonly used for condensation drainage on
central air conditioning system is Answer: PVC
⫸ When pressure testing completed copper tubing assembly with
pressuried nitrogen the nitrogen cylinder should Answer: always be on
the ground
,⫸ connections should be permanently connected with_____ on drainage
piping assemblies that uses PVC piping Answer: Glue specified for PVC
pipe
⫸ Using oxygen to purge copper tubing after brasing Answer: could
cause and explosion
⫸ Two gases that considered non-condensable in a refrigeration
Answer: Air and Nitrogen
⫸ Residential air condition system have a super heat range of ____
degress under normal operating conditions? Answer: 8 to 12
⫸ which is not a condition of low superheat on an air conditioning
system Answer: Refrigerant undercharged
⫸ The reason that subcooling would be below 8 degrees on air
conditiong system Answer: dirty or blocked condenser coil
⫸ The cause for exessive subcoolinf in an air conditoning system ?
Answer: system operating in low abient conditions
⫸ when reading blue prints for proper wall and duct location, the
technician should look at the ______ Answer: Floor plan
, ⫸ When trouble shooting an air conditioning system, the operating
pressures mare 40 psig on the low side and 116 in the high side, what
would be the most likely problem? Answer: Refrigerant Leak
⫸ When trouble shooting an air conditioning system and you notice
frost on the suction line, what would be the problem? Answer: Dirty air
filter
⫸ An Hvac system that depends on the temperatures below the ground
surface as an operation factor is a/an______? Answer: geothermal heat
pump
⫸ The best tool to open and close the system access valve on a
refrigeration system is the wrench. Answer: Geothermal heat pump
⫸ when pressure testing a completed copper tubing assembly with
pressurized nitrgen cylinders should Answer: always be used with a
regulator
⫸ a 14-gauge soild copper wire would require____amp circuit
protection Answer: 15 amps
⫸ in a 24V circuit containing a switch and coil, it will read 24V at the
coil if the Answer: switched is closed
CERTIFICATION REVIEW SET 2026
ANSWERS GUARANTEED PASS
⫸ when putting out a fire involving oily rags use a ________ fire
extinguisher? Answer: Class B
⫸ The best tool to open and close the stem access valve on a
refrigeriation system is the_______ Answer: Refrigeration service
wrench
⫸ Which power tool is best to cut steel rod? Answer: Sawzall
⫸ CSST (steal tubing) connections Answer: can be used with both
natural and propane gas equipment
⫸ The type of pipe commonly used for condensation drainage on
central air conditioning system is Answer: PVC
⫸ When pressure testing completed copper tubing assembly with
pressuried nitrogen the nitrogen cylinder should Answer: always be on
the ground
,⫸ connections should be permanently connected with_____ on drainage
piping assemblies that uses PVC piping Answer: Glue specified for PVC
pipe
⫸ Using oxygen to purge copper tubing after brasing Answer: could
cause and explosion
⫸ Two gases that considered non-condensable in a refrigeration
Answer: Air and Nitrogen
⫸ Residential air condition system have a super heat range of ____
degress under normal operating conditions? Answer: 8 to 12
⫸ which is not a condition of low superheat on an air conditioning
system Answer: Refrigerant undercharged
⫸ The reason that subcooling would be below 8 degrees on air
conditiong system Answer: dirty or blocked condenser coil
⫸ The cause for exessive subcoolinf in an air conditoning system ?
Answer: system operating in low abient conditions
⫸ when reading blue prints for proper wall and duct location, the
technician should look at the ______ Answer: Floor plan
, ⫸ When trouble shooting an air conditioning system, the operating
pressures mare 40 psig on the low side and 116 in the high side, what
would be the most likely problem? Answer: Refrigerant Leak
⫸ When trouble shooting an air conditioning system and you notice
frost on the suction line, what would be the problem? Answer: Dirty air
filter
⫸ An Hvac system that depends on the temperatures below the ground
surface as an operation factor is a/an______? Answer: geothermal heat
pump
⫸ The best tool to open and close the system access valve on a
refrigeration system is the wrench. Answer: Geothermal heat pump
⫸ when pressure testing a completed copper tubing assembly with
pressurized nitrgen cylinders should Answer: always be used with a
regulator
⫸ a 14-gauge soild copper wire would require____amp circuit
protection Answer: 15 amps
⫸ in a 24V circuit containing a switch and coil, it will read 24V at the
coil if the Answer: switched is closed
