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AIR CONDITIONING CLASS “A” CONTRACTORS QUALIFICATIONS Reference State Statues and Administrative Rules 489.105 Definitions- As used in this part: (d) “Class A Air-Conditioning Contractor”  A contractor whose services are unlimited in the execution of contracts requiring the experience, knowledge, and skill to install, maintain, repair, fabricate, alter, extend, or design, when not prohibited by law, central air-conditioning, refrigeration, heating and ventilating systems, including duct work in connection with a complete system only to the extent such work is performed by the contractor as is necessary to make complete an air-distribution system, boiler and unfired pressure vessel systems, and all appurtenances, apparatus, or equipment used in connection therewith and any duct cleaning and equipment sanitizing which requires at least partial disassembling of the system; to install, maintain, repair, fabricate, alter extend, or design, when not prohibited by law, piping, insulation of pipes, vessels and ducts, pressure and process piping, and pneumatic control piping; to replace, disconnect, or reconnect power wiring on the load side of the dedicated existing electrical disconnect switch; to install, disconnect. And reconnect low voltage heating, ventilating, and air-conditioning control wiring; and to install a condensate drain from an air-conditioning unit to an existing safe waste or other approved disposal other than a direct connection to a sanitary system. The scope of work for such contractor shall also include any excavation work incidental thereto, but not shall include any work such as liquefied petroleum or natural gas fuel lines within buildings potable water lines or connections thereto, sanitary sewer lines, swimming pool piping and filters, or electrical power wiring. 489.111 Licensure by Examination (1) Any person who desires to be certified shall apply to the department in wiring. (2) A person shall be eligible for licensure by examination if the person: (a) Is 18 years of age; (b) Is of good moral character; and (c) Meets eligibility requirements according to one of the following criteria:  1. Has received a baccalaureate degree from an accredited 4-year college in the appropriate field of engineering, architecture, or building construction and has 1 year of proven experience in the category in which the person seeks to qualify. For the purpose of this part, a minimum of 2,000 person-hours shall be used in determining full-time equivalency. 2. Has a total of at least 4 years of active experience as a worker who has learned the trade by serving an apprenticeship as a skilled worker as a skilled worker who is able to command the rate of a mechanic in the particular trade or as a foreman who is in charge of a group of workers and usually is responsible to a superintendent or a contractor or his or her equivalent, provided, however, that at least 1 year of active experience shall be as a foreman. 3. Has a combination of not less than 1 year of experience as a foreman and not less then 3 years of credits for any accredited college-level courses; has a combination of not less than 1 year of experience as a skilled worker, 1 year of experience as a foreman, and not less than 2 years of credits for any accredited college-level courses; or has a combination of not less than 2 years of experience as a skilled worker, 1 year of experience as a foreman, and not less than 1 year of credits for any accredited college-level courses. 5.b. An active certified air-conditioning Class C Contractor is eligible to take the air-conditioning Class A contractors’ examination if he or she possesses a minimum of 4 years of proven experience in the classification in which he or she is certified. c. An active certified air-conditioning Class B contractor is eligible to take the Class A contractors’ examination if he or she possesses a minimum of 1 year of proven experience in the classification in which he or she is certified.