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Nevada C 21 Refrigeration & Air Conditioning
Maintenance Contractor Exam ACTUAL EXAM
COMPLETE QUESTIONS AND CORRECT ANSWERS
LATEST UPDATE THIS YEAR
Nevada C-21 Refrigeration & Air Conditioning Maintenance Contractor Exam
Summarized Exam Topics Covered (Point Form – Accurate for C-21 Exam)
• License Scope (NAC 624.670): Installation, service, repair, or maintenance of refrigeration and
air conditioning systems for comfort cooling or commercial/industrial refrigeration; excludes
process piping not part of an HVAC system; cannot perform electrical or plumbing work beyond
the disconnect or refrigerant piping.
• Contractor Classification: C-21 is a specialty contractor; must carry general liability and workers’
compensation insurance; license is required for any project over $1,000.
• Qualified Employee (NAC 624.610): Must have at least 4 years of full-time experience within the
past 10 years; can substitute education (e.g., apprenticeship) for up to 2 years.
• Exemptions (NRS 624.031): Owner-occupied single-family residences; public utilities operating
under their own franchise; mining operations; agricultural operations.
• Financial Responsibility (NAC 624.400 – 624.440): Minimum net worth requirement, financial
statements, bonding, credit checks.
• Business Organization: Sole proprietorship, partnership, corporation, LLC – each has specific
registration requirements with the Nevada Secretary of State.
• Contract Requirements (NRS 624.600 – 624.630): Written contract required for work over
$1,000; must include contractor’s license number, start/end dates, payment schedule,
description of work, and notice of right to lien.
• Mechanic’s Lien (NRS 108.221 – 108.246): May be filed for unpaid work; time limits; notice
requirements for residential projects; foreclosure period.
• Safety & OSHA: Fall protection (6 feet or more), lockout/tagout (LOTO), refrigerant handling
(EPA Section 608), ladder safety (3-point contact), confined spaces (permit required).
• Nevada State Contractors Board: Investigates complaints; may impose fines, suspend or revoke
licenses; administrative hearings.
• Material & Labor Warranties: Contractor must provide warranty for workmanship (typically 1
year unless specified otherwise).
• Change Orders: Must be in writing and signed by both parties to be enforceable.
• Home Solicitation Sales (NRS 598): Three-day right of cancellation for contracts signed outside
the contractor’s normal place of business.
• Hazardous Materials: Refrigerant recovery, handling of oils, disposal regulations.
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1. A homeowner in Las Vegas wants to have a new split-system air conditioner installed. The estimated
cost
is 2,500.UnderNevadalaw,doesthisworkrequireawrittencontract?A)No,iftheworkisdonebyalicensedcontr
actorB)Yes,becausethecostexceeds2,500.UnderNevadalaw,doesthisworkrequireawrittencontract?A)No,if
theworkisdonebyalicensedcontractorB)Yes,becausethecostexceeds1,000
C) No, because residential work is exempt from written contract requirements
D) Yes, only if the homeowner requests a contract in writing
Answer: B
Rationale: NRS 624.600 requires a written contract for any construction work where the total contract
price exceeds $1,000. This applies regardless of whether the work is residential or commercial.
2. A C-21 contractor is hired to install a new commercial refrigeration system in a restaurant. The
contractor’s employee must perform some brazing. Which of the following certifications is required by
federal law for the employee handling refrigerant?
A) EPA Section 608 Technician Certification
B) Nevada State Board of Refrigeration license
C) OSHA 30-hour card
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D) NATE certification
Answer: A
Rationale: Federal EPA regulations under Section 608 of the Clean Air Act require technicians who
maintain, service, repair, or dispose of appliances containing refrigerants to be certified. This applies to
all C-21 work involving refrigerant circuits.
3. A C-21 contractor agrees to install a new HVAC system in a commercial building. The contract price is
$15,000. Which of the following must be included in the written contract?
A) The contractor’s home address
B) The contractor’s Nevada contractor license number
C) A surety bond number
D) The subcontractor’s license number
Answer: B
Rationale: NRS 624.600 requires the written contract to contain the contractor’s license number, the
approximate start and completion dates, a description of the work, the total price, the schedule of
payments, and a notice of the right to lien.
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4. A C-21 contractor performs maintenance on a walk-in cooler at a grocery store. The work involves
replacing a failed condenser fan motor. The contractor does not handle refrigerant lines. Does this work
fall within the C-21 scope?
A) Yes, C-21 covers maintenance and repair of refrigeration equipment
B) No, C-21 only covers new installation, not maintenance
C) Yes, but only if the contractor also has a plumbing license
D) No, C-21 contractors cannot replace motors
Answer: A
Rationale: NAC 624.670 explicitly includes the “repair, service, and maintenance of refrigeration and air
conditioning systems” within the C-21 classification. Replacing a condenser fan motor is a permitted
repair.
5. A licensed C-21 contractor wishes to bid on a project that also requires installation of a new electrical
panel for the HVAC equipment. Can the C-21 contractor legally perform the electrical work?
A) Yes, HVAC contractors are allowed to do all electrical work on a project
B) No, electrical work beyond the disconnect (including new panel) requires an electrical contractor
license (C-2)
Nevada C 21 Refrigeration & Air Conditioning
Maintenance Contractor Exam ACTUAL EXAM
COMPLETE QUESTIONS AND CORRECT ANSWERS
LATEST UPDATE THIS YEAR
Nevada C-21 Refrigeration & Air Conditioning Maintenance Contractor Exam
Summarized Exam Topics Covered (Point Form – Accurate for C-21 Exam)
• License Scope (NAC 624.670): Installation, service, repair, or maintenance of refrigeration and
air conditioning systems for comfort cooling or commercial/industrial refrigeration; excludes
process piping not part of an HVAC system; cannot perform electrical or plumbing work beyond
the disconnect or refrigerant piping.
• Contractor Classification: C-21 is a specialty contractor; must carry general liability and workers’
compensation insurance; license is required for any project over $1,000.
• Qualified Employee (NAC 624.610): Must have at least 4 years of full-time experience within the
past 10 years; can substitute education (e.g., apprenticeship) for up to 2 years.
• Exemptions (NRS 624.031): Owner-occupied single-family residences; public utilities operating
under their own franchise; mining operations; agricultural operations.
• Financial Responsibility (NAC 624.400 – 624.440): Minimum net worth requirement, financial
statements, bonding, credit checks.
• Business Organization: Sole proprietorship, partnership, corporation, LLC – each has specific
registration requirements with the Nevada Secretary of State.
• Contract Requirements (NRS 624.600 – 624.630): Written contract required for work over
$1,000; must include contractor’s license number, start/end dates, payment schedule,
description of work, and notice of right to lien.
• Mechanic’s Lien (NRS 108.221 – 108.246): May be filed for unpaid work; time limits; notice
requirements for residential projects; foreclosure period.
• Safety & OSHA: Fall protection (6 feet or more), lockout/tagout (LOTO), refrigerant handling
(EPA Section 608), ladder safety (3-point contact), confined spaces (permit required).
• Nevada State Contractors Board: Investigates complaints; may impose fines, suspend or revoke
licenses; administrative hearings.
• Material & Labor Warranties: Contractor must provide warranty for workmanship (typically 1
year unless specified otherwise).
• Change Orders: Must be in writing and signed by both parties to be enforceable.
• Home Solicitation Sales (NRS 598): Three-day right of cancellation for contracts signed outside
the contractor’s normal place of business.
• Hazardous Materials: Refrigerant recovery, handling of oils, disposal regulations.
, Page 2 of 132
1. A homeowner in Las Vegas wants to have a new split-system air conditioner installed. The estimated
cost
is 2,500.UnderNevadalaw,doesthisworkrequireawrittencontract?A)No,iftheworkisdonebyalicensedcontr
actorB)Yes,becausethecostexceeds2,500.UnderNevadalaw,doesthisworkrequireawrittencontract?A)No,if
theworkisdonebyalicensedcontractorB)Yes,becausethecostexceeds1,000
C) No, because residential work is exempt from written contract requirements
D) Yes, only if the homeowner requests a contract in writing
Answer: B
Rationale: NRS 624.600 requires a written contract for any construction work where the total contract
price exceeds $1,000. This applies regardless of whether the work is residential or commercial.
2. A C-21 contractor is hired to install a new commercial refrigeration system in a restaurant. The
contractor’s employee must perform some brazing. Which of the following certifications is required by
federal law for the employee handling refrigerant?
A) EPA Section 608 Technician Certification
B) Nevada State Board of Refrigeration license
C) OSHA 30-hour card
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D) NATE certification
Answer: A
Rationale: Federal EPA regulations under Section 608 of the Clean Air Act require technicians who
maintain, service, repair, or dispose of appliances containing refrigerants to be certified. This applies to
all C-21 work involving refrigerant circuits.
3. A C-21 contractor agrees to install a new HVAC system in a commercial building. The contract price is
$15,000. Which of the following must be included in the written contract?
A) The contractor’s home address
B) The contractor’s Nevada contractor license number
C) A surety bond number
D) The subcontractor’s license number
Answer: B
Rationale: NRS 624.600 requires the written contract to contain the contractor’s license number, the
approximate start and completion dates, a description of the work, the total price, the schedule of
payments, and a notice of the right to lien.
, Page 4 of 132
4. A C-21 contractor performs maintenance on a walk-in cooler at a grocery store. The work involves
replacing a failed condenser fan motor. The contractor does not handle refrigerant lines. Does this work
fall within the C-21 scope?
A) Yes, C-21 covers maintenance and repair of refrigeration equipment
B) No, C-21 only covers new installation, not maintenance
C) Yes, but only if the contractor also has a plumbing license
D) No, C-21 contractors cannot replace motors
Answer: A
Rationale: NAC 624.670 explicitly includes the “repair, service, and maintenance of refrigeration and air
conditioning systems” within the C-21 classification. Replacing a condenser fan motor is a permitted
repair.
5. A licensed C-21 contractor wishes to bid on a project that also requires installation of a new electrical
panel for the HVAC equipment. Can the C-21 contractor legally perform the electrical work?
A) Yes, HVAC contractors are allowed to do all electrical work on a project
B) No, electrical work beyond the disconnect (including new panel) requires an electrical contractor
license (C-2)
