CR39 AZ Exam 2026-2027 Questions With Answers Fully Verified
Typical subcooling range for TXV system?Answer8-12°F
The purpose of an expansion valve?AnswerControl refrigerant flow into the evaporator
Which refrigerant is phased out due to ozone depletion?AnswerR-22
What is the ozone depletion potential (ODP) of R-410A?Answer0
What is the global warming potential (GWP) of R-410A?Answer2088
Best practice when brazing refrigerant lines?AnswerPurge with nitrogen
What does AHRI stand for?AnswerAir-Conditioning, Heating, and Refrigeration Institute
What does ACCA stand for?AnswerAir Conditioning Contractors of America
Manual J is used for?AnswerResidential load calculations
Manual D is used for?AnswerDuct design
Manual S is used for?AnswerEquipment selection
In Arizona, who licenses HVAC contractors?AnswerArizona Registrar of Contractors (ROC)
Minimum years of experience for Arizona HVAC contractor license?Answer4 years
, ROC license classification for HVAC?AnswerCR-39
What's the minimum passing score for the Arizona CR-39 exam?Answer70%
How often must an Arizona contractor renew their license?AnswerEvery 2 years
What is required to activate a new ROC license?AnswerBond and proof of experience
When is a building permit required for HVAC work?AnswerWhen installing or replacing major
equipment
What is the penalty for contracting without a license in Arizona?AnswerClass 1 misdemeanor
What is the maximum fine for unlicensed contracting in Arizona?Answer$2,500 plus surcharges
In electrical wiring, what color is typically used for grounded conductors?AnswerWhite or gray
What color is used for ungrounded conductors?AnswerBlack or red
What color is used for equipment grounding conductors?AnswerGreen or bare
Minimum burial depth for direct-burial electrical cable?Answer24 inches
Maximum allowable voltage drop in branch circuits?Answer3%
Minimum clearance in front of electrical panels?Answer36 inches
Minimum working space width for electrical equipment?Answer30 inches
Typical subcooling range for TXV system?Answer8-12°F
The purpose of an expansion valve?AnswerControl refrigerant flow into the evaporator
Which refrigerant is phased out due to ozone depletion?AnswerR-22
What is the ozone depletion potential (ODP) of R-410A?Answer0
What is the global warming potential (GWP) of R-410A?Answer2088
Best practice when brazing refrigerant lines?AnswerPurge with nitrogen
What does AHRI stand for?AnswerAir-Conditioning, Heating, and Refrigeration Institute
What does ACCA stand for?AnswerAir Conditioning Contractors of America
Manual J is used for?AnswerResidential load calculations
Manual D is used for?AnswerDuct design
Manual S is used for?AnswerEquipment selection
In Arizona, who licenses HVAC contractors?AnswerArizona Registrar of Contractors (ROC)
Minimum years of experience for Arizona HVAC contractor license?Answer4 years
, ROC license classification for HVAC?AnswerCR-39
What's the minimum passing score for the Arizona CR-39 exam?Answer70%
How often must an Arizona contractor renew their license?AnswerEvery 2 years
What is required to activate a new ROC license?AnswerBond and proof of experience
When is a building permit required for HVAC work?AnswerWhen installing or replacing major
equipment
What is the penalty for contracting without a license in Arizona?AnswerClass 1 misdemeanor
What is the maximum fine for unlicensed contracting in Arizona?Answer$2,500 plus surcharges
In electrical wiring, what color is typically used for grounded conductors?AnswerWhite or gray
What color is used for ungrounded conductors?AnswerBlack or red
What color is used for equipment grounding conductors?AnswerGreen or bare
Minimum burial depth for direct-burial electrical cable?Answer24 inches
Maximum allowable voltage drop in branch circuits?Answer3%
Minimum clearance in front of electrical panels?Answer36 inches
Minimum working space width for electrical equipment?Answer30 inches
