NATE AC SERVICE CERTIFICATION FINAL
PAPER 2026 TESTED QUESTIONS WITH
FULL SOLUTION 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
●● a compressor with proper voltage and a hard start relayt and
capacitor draws lock rotor amps on startup. what is the problem?.
Answer:
●● 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
●● a system with a reciprocating compressor is pumped down and the
power is shut off. if the suction pressure rises very rapidly this is an
indication that the.
Answer:
●● 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 refriderant 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
●● When a split system air conditioner has a counterflow air handler,
what are the best locations for return air grilles?.
Answer: on a sidewall next to the ceiling
●● the lubricating oil primarily ised with r-22 is.
Answer: mineral oil based
PAPER 2026 TESTED QUESTIONS WITH
FULL SOLUTION 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
●● a compressor with proper voltage and a hard start relayt and
capacitor draws lock rotor amps on startup. what is the problem?.
Answer:
●● 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
●● a system with a reciprocating compressor is pumped down and the
power is shut off. if the suction pressure rises very rapidly this is an
indication that the.
Answer:
●● 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 refriderant 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
●● When a split system air conditioner has a counterflow air handler,
what are the best locations for return air grilles?.
Answer: on a sidewall next to the ceiling
●● the lubricating oil primarily ised with r-22 is.
Answer: mineral oil based
