NATE AC SERVICE EXAMPREP 2026
COMPLETE QUESTIONS AND ANSWERS
GRADED A+
●● Electronic air cleaners can operate with internal voltages as high as?
Answer: 5000v
●● Why do some electromechanical type thermostats require
connections to both the hot side and common side of the low voltage
transfromer Answer: Display lights must be powered using both sides of
the line
●● the continuity reading on a functional fuse will be Answer: 0 ohms
●● the technician believes that a hermetic compressor has a permanently
openn internal overload protectio the technician should test the
compressor while it is? Answer: cool
●● outdoor condensing units that are installed in areas where flooding is
possible must Answer: be mounted above flood level
●● In a low voltage circuit, a corroded wire-to-terminal connection acts
in the circuit like an Answer: additional resistor
, ●● if an air conditioning system needs to operate in a low ambient
condtion, the condenser may become to effiecent Answer: the head
pressure becomes too low and the condenser fan motor needs to be
slowed or stopped
●● to achieve a specific seer rating which components must be matched
Answer: condensing unit and evaporator
●● on a residental no cooling call, typically the first check would be
Answer: if the thermostat is calling for cooling
●● in an economizer system the enthalpy control is used to measure
Answer: both temperature and moisture content
●● an air conditioner refrigerant circut should be evacuated to a
minimum of Answer: 500 microns
●● what steps are necessary to clean a two row curved condenser coil
Answer: separate the two rows of coils, spray all surfaces with proper
coil cleaner and water flush
●● return air leakage in a hot attic will Answer: decrease capacity
COMPLETE QUESTIONS AND ANSWERS
GRADED A+
●● Electronic air cleaners can operate with internal voltages as high as?
Answer: 5000v
●● Why do some electromechanical type thermostats require
connections to both the hot side and common side of the low voltage
transfromer Answer: Display lights must be powered using both sides of
the line
●● the continuity reading on a functional fuse will be Answer: 0 ohms
●● the technician believes that a hermetic compressor has a permanently
openn internal overload protectio the technician should test the
compressor while it is? Answer: cool
●● outdoor condensing units that are installed in areas where flooding is
possible must Answer: be mounted above flood level
●● In a low voltage circuit, a corroded wire-to-terminal connection acts
in the circuit like an Answer: additional resistor
, ●● if an air conditioning system needs to operate in a low ambient
condtion, the condenser may become to effiecent Answer: the head
pressure becomes too low and the condenser fan motor needs to be
slowed or stopped
●● to achieve a specific seer rating which components must be matched
Answer: condensing unit and evaporator
●● on a residental no cooling call, typically the first check would be
Answer: if the thermostat is calling for cooling
●● in an economizer system the enthalpy control is used to measure
Answer: both temperature and moisture content
●● an air conditioner refrigerant circut should be evacuated to a
minimum of Answer: 500 microns
●● what steps are necessary to clean a two row curved condenser coil
Answer: separate the two rows of coils, spray all surfaces with proper
coil cleaner and water flush
●● return air leakage in a hot attic will Answer: decrease capacity
