NATE AC SERVICE CERTIFICATION
ACTUAL TEST PAPER 2026 QUESTIONS
WITH SOLUTIONS 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
ACTUAL TEST PAPER 2026 QUESTIONS
WITH SOLUTIONS 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
