California HVAC Journeyman Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A California HVAC journeyman is assigned to install a split-system air
conditioning unit in a commercial occupancy. During the installation,
the technician notices that the condenser disconnect is located within
sight of the equipment but lacks a proper weatherproof enclosure.
Under California electrical and mechanical safety standards, what is
the most appropriate action before energizing the system?
A. Energize the system temporarily and report the issue later
B. Install a lock on the disconnect and proceed
C. Ignore the issue because the disconnect is within sight
D. Replace or install an approved weatherproof disconnect enclosure
before operation
,The National Electrical Code and California safety requirements require
outdoor disconnects to be properly weatherproofed to protect against
moisture intrusion and electrical hazards. Energizing equipment with an
unapproved disconnect could create shock, fire, or equipment failure risks.
2. A journeyman HVAC technician is troubleshooting a rooftop package
unit that repeatedly trips the high-pressure safety switch during peak
afternoon temperatures. Which condition is the most likely cause of
this recurring issue?
A. Low evaporator airflow due to a dirty blower wheel
B. Restricted condenser airflow caused by dirty condenser coils
C. A defective room thermostat calibration
D. Excessive evaporator superheat conditions
Dirty condenser coils reduce heat rejection at the condenser, causing head
pressure to rise significantly during high ambient temperatures. Once
pressure exceeds safe operating limits, the high-pressure switch opens to
protect the compressor from damage.
3. During brazing operations on refrigerant piping inside a commercial
building, California fire safety regulations require the HVAC technician
to perform which procedure?
A. Use compressed oxygen to accelerate brazing temperatures
B. Leave combustible debris beneath the piping area
,C. Maintain a fire watch and keep an approved extinguisher nearby
D. Disconnect all refrigerant pressure controls permanently
Hot work procedures require fire prevention measures during brazing and
welding activities. A fire watch and accessible fire extinguisher reduce the
likelihood of uncontrolled ignition in occupied or combustible
environments.
4. A technician measuring voltage at a single-phase 240-volt compressor
contactor obtains a reading of 208 volts during operation. What is the
most likely effect of prolonged operation at this reduced voltage?
A. Compressor amperage will decrease significantly
B. Compressor efficiency will improve due to lower voltage
C. Motor overheating and premature compressor failure may occur
D. Refrigerant pressures will remain unaffected
Undervoltage conditions force motors and compressors to draw higher
amperage to maintain operation, leading to overheating, insulation
breakdown, and shortened equipment life. HVAC systems are designed to
operate within specific voltage tolerances.
5. Which refrigerant characteristic most directly contributed to the
phaseout of R-22 systems under environmental regulations?
, A. High flammability potential
B. Excessive compressor lubrication requirements
C. Low operating pressure characteristics
D. Ozone depletion potential due to chlorine content
R-22 contains hydrochlorofluorocarbon compounds that contribute to
ozone layer depletion. Environmental regulations mandated the gradual
elimination of ozone-depleting refrigerants in favor of more
environmentally acceptable alternatives.
6. A journeyman technician is calculating airflow requirements for a
commercial office renovation. If the system requires 2,400 cubic feet
per minute distributed evenly across six supply diffusers, how much
airflow should each diffuser provide?
A. 250 CFM
B. 300 CFM
C. 400 CFM
D. 600 CFM
Dividing the total airflow of 2,400 CFM by six diffusers results in 400 CFM
per diffuser. Proper airflow balancing ensures occupant comfort and
system efficiency.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A California HVAC journeyman is assigned to install a split-system air
conditioning unit in a commercial occupancy. During the installation,
the technician notices that the condenser disconnect is located within
sight of the equipment but lacks a proper weatherproof enclosure.
Under California electrical and mechanical safety standards, what is
the most appropriate action before energizing the system?
A. Energize the system temporarily and report the issue later
B. Install a lock on the disconnect and proceed
C. Ignore the issue because the disconnect is within sight
D. Replace or install an approved weatherproof disconnect enclosure
before operation
,The National Electrical Code and California safety requirements require
outdoor disconnects to be properly weatherproofed to protect against
moisture intrusion and electrical hazards. Energizing equipment with an
unapproved disconnect could create shock, fire, or equipment failure risks.
2. A journeyman HVAC technician is troubleshooting a rooftop package
unit that repeatedly trips the high-pressure safety switch during peak
afternoon temperatures. Which condition is the most likely cause of
this recurring issue?
A. Low evaporator airflow due to a dirty blower wheel
B. Restricted condenser airflow caused by dirty condenser coils
C. A defective room thermostat calibration
D. Excessive evaporator superheat conditions
Dirty condenser coils reduce heat rejection at the condenser, causing head
pressure to rise significantly during high ambient temperatures. Once
pressure exceeds safe operating limits, the high-pressure switch opens to
protect the compressor from damage.
3. During brazing operations on refrigerant piping inside a commercial
building, California fire safety regulations require the HVAC technician
to perform which procedure?
A. Use compressed oxygen to accelerate brazing temperatures
B. Leave combustible debris beneath the piping area
,C. Maintain a fire watch and keep an approved extinguisher nearby
D. Disconnect all refrigerant pressure controls permanently
Hot work procedures require fire prevention measures during brazing and
welding activities. A fire watch and accessible fire extinguisher reduce the
likelihood of uncontrolled ignition in occupied or combustible
environments.
4. A technician measuring voltage at a single-phase 240-volt compressor
contactor obtains a reading of 208 volts during operation. What is the
most likely effect of prolonged operation at this reduced voltage?
A. Compressor amperage will decrease significantly
B. Compressor efficiency will improve due to lower voltage
C. Motor overheating and premature compressor failure may occur
D. Refrigerant pressures will remain unaffected
Undervoltage conditions force motors and compressors to draw higher
amperage to maintain operation, leading to overheating, insulation
breakdown, and shortened equipment life. HVAC systems are designed to
operate within specific voltage tolerances.
5. Which refrigerant characteristic most directly contributed to the
phaseout of R-22 systems under environmental regulations?
, A. High flammability potential
B. Excessive compressor lubrication requirements
C. Low operating pressure characteristics
D. Ozone depletion potential due to chlorine content
R-22 contains hydrochlorofluorocarbon compounds that contribute to
ozone layer depletion. Environmental regulations mandated the gradual
elimination of ozone-depleting refrigerants in favor of more
environmentally acceptable alternatives.
6. A journeyman technician is calculating airflow requirements for a
commercial office renovation. If the system requires 2,400 cubic feet
per minute distributed evenly across six supply diffusers, how much
airflow should each diffuser provide?
A. 250 CFM
B. 300 CFM
C. 400 CFM
D. 600 CFM
Dividing the total airflow of 2,400 CFM by six diffusers results in 400 CFM
per diffuser. Proper airflow balancing ensures occupant comfort and
system efficiency.
