nate ac service test
A technician has determined a supply in a flexible duct system is leaking.
What
be should correct answers All connections inner and
checked?
outer layers.
Electronic air cleaners can operate with internal voltages as high as?
correct answers
5000
v
Why do some electromechanical type thermostats require connections to
both and
side the hot
common side of the low voltage transfromer correct answers
Display
must belights
powered using both sides of
the line
the continuity reading on a functional fuse will be correct
answers 0 ohms
a compressor with proper voltage and a hard start relayt and capacitor
draws on
amps lock rotor what is the problem? correct
startup.
answers
the technician believes that a hermetic compressor has a permanently
openn internal
overload protectio the technician should test the compressor while it
is? correct
answers
cool
outdoor condensing units that are installed in areas where flooding is
possibleanswers
correct must be mounted above
flood level
In a low voltage circuit, a corroded wire-to-terminal connection acts in the
circuit like
correct an
answers additional
resistor
a system with a reciprocating compressor is pumped down and the power is
shutsuction
the off. if pressure rises very rapidly this is an indication that the
correct answers
if an air conditioning system needs to operate in a low ambient condtion, the
condenser
may become to effiecent correct answers the head pressure becomes too
condenser
low and thefan motor needs to be slowed or
stopped
to achieve a specific seer rating which components must be matched
correct answers
condensing unit and
evaporator
on a residental no cooling call, typically the first check would be correct
answers if the
thermostat is calling for
cooling
in an economizer system the enthalpy control is used to measure correct
answers bothand moisture
temperature
content
, an air conditioner refriderant circut should be evacuated to a minimum
of correct
answers 500
microns
what steps are necessary to clean a two row curved condenser coil
correct answers
separate the two rows of coils, spray all surfaces with proper coil cleaner
and water
flus
h
return air leakage in a hot attic will correct answers decrease
capacity
When a split system air conditioner has a counterflow air handler, what
are the best
locations for return air grilles? correct answers on a sidewall next to
the ceiling
the lubricating oil primarily ised with r-22 is correct answers
mineral oil based
other than using a two-stage compressor what is another method for
capacityanswers
correct control liquid line
receiver
a system air flow check is used to diagnose correct answers humidity
problems
what precautions need to be taken with a packaged ac system with
ductworkcorrect
outside installed
answers it must be insulated and
weatherproofed
which of the following is a proper operation for a packaged air conditioning
system
an using
electric control board correct answers the blower condenser fan and
compressor
comes on at the same
time
which of the following should be done to reduce vibratiion transmission in
sheet metal
ductwork correct answers add isolations
collors
what does a test of the compressor oil after a burnout indicate correct
answers acidity
a 120v x 24v step down transformer has a rating of 40va. must not be
connected
more than tocorrect answers 1.7 amps
40/24=1.666777
what is the maximum acceptable supply voltage tolerance for a 120v
circuit correct
answers
5%
in a simple refrigeration system the refriderent boils in the correct answers
evaporator
electronic air cleaners do not remove correct answers
animal fur
a delay on make relay delays load from correct answers from energizing
after after
time a fixeda
cycle
for indoor air quality purposes the minimun distance between and
economizer
plumbing andiut
vent a correct
answers 10ft
A technician has determined a supply in a flexible duct system is leaking.
What
be should correct answers All connections inner and
checked?
outer layers.
Electronic air cleaners can operate with internal voltages as high as?
correct answers
5000
v
Why do some electromechanical type thermostats require connections to
both and
side the hot
common side of the low voltage transfromer correct answers
Display
must belights
powered using both sides of
the line
the continuity reading on a functional fuse will be correct
answers 0 ohms
a compressor with proper voltage and a hard start relayt and capacitor
draws on
amps lock rotor what is the problem? correct
startup.
answers
the technician believes that a hermetic compressor has a permanently
openn internal
overload protectio the technician should test the compressor while it
is? correct
answers
cool
outdoor condensing units that are installed in areas where flooding is
possibleanswers
correct must be mounted above
flood level
In a low voltage circuit, a corroded wire-to-terminal connection acts in the
circuit like
correct an
answers additional
resistor
a system with a reciprocating compressor is pumped down and the power is
shutsuction
the off. if pressure rises very rapidly this is an indication that the
correct answers
if an air conditioning system needs to operate in a low ambient condtion, the
condenser
may become to effiecent correct answers the head pressure becomes too
condenser
low and thefan motor needs to be slowed or
stopped
to achieve a specific seer rating which components must be matched
correct answers
condensing unit and
evaporator
on a residental no cooling call, typically the first check would be correct
answers if the
thermostat is calling for
cooling
in an economizer system the enthalpy control is used to measure correct
answers bothand moisture
temperature
content
, an air conditioner refriderant circut should be evacuated to a minimum
of correct
answers 500
microns
what steps are necessary to clean a two row curved condenser coil
correct answers
separate the two rows of coils, spray all surfaces with proper coil cleaner
and water
flus
h
return air leakage in a hot attic will correct answers decrease
capacity
When a split system air conditioner has a counterflow air handler, what
are the best
locations for return air grilles? correct answers on a sidewall next to
the ceiling
the lubricating oil primarily ised with r-22 is correct answers
mineral oil based
other than using a two-stage compressor what is another method for
capacityanswers
correct control liquid line
receiver
a system air flow check is used to diagnose correct answers humidity
problems
what precautions need to be taken with a packaged ac system with
ductworkcorrect
outside installed
answers it must be insulated and
weatherproofed
which of the following is a proper operation for a packaged air conditioning
system
an using
electric control board correct answers the blower condenser fan and
compressor
comes on at the same
time
which of the following should be done to reduce vibratiion transmission in
sheet metal
ductwork correct answers add isolations
collors
what does a test of the compressor oil after a burnout indicate correct
answers acidity
a 120v x 24v step down transformer has a rating of 40va. must not be
connected
more than tocorrect answers 1.7 amps
40/24=1.666777
what is the maximum acceptable supply voltage tolerance for a 120v
circuit correct
answers
5%
in a simple refrigeration system the refriderent boils in the correct answers
evaporator
electronic air cleaners do not remove correct answers
animal fur
a delay on make relay delays load from correct answers from energizing
after after
time a fixeda
cycle
for indoor air quality purposes the minimun distance between and
economizer
plumbing andiut
vent a correct
answers 10ft
