1. (a) Electrical Connections.

   1. (1) On new construction of environmental air conditioning, commercial refrigeration, and process cooling or heating systems, licensees shall connect the appliance to the electrical line or disconnect that is provided for that purpose.
   2. (2) Licensees may replace and reconnect environmental air conditioning, commercial refrigeration, process cooling or heating systems, or component parts of the same or lesser amperage. On replacement environmental air conditioning, commercial refrigeration, process cooling or heating systems where the electrical disconnect has not been installed and is required by the current National Electrical Code, the licensee may install a disconnect directly adjacent to or on the replacement system and reconnect the system.
   3. (3) Control wiring of 50 volts or less may be installed and serviced by a licensee.
   4. (4) All electrical work shall be performed in accordance with standards at least as strict as that established by the current National Electrical Code.

2. (b) Piping.

   1. (1) Fuel gas piping for new or replaced environmental air conditioning, commercial refrigeration, or process cooling or heating systems may be installed by a licensee. Fuel gas piping by a licensee is limited to the portion of piping between the appliance and the existing piping system, connected at an existing shut-off valve for such use. Existing piping systems, stops, or shut-off valves shall not be altered by a licensee.
   2. (2) Drain piping associated with environmental air conditioning, commercial refrigeration, or process cooling or heating systems shall be installed by a licensee if it terminates outside the building. If the piping terminates inside the building, a licensee may make the connection if the connection is on the inlet side of a properly installed trap. Such drain piping shall be installed in accordance with applicable plumbing and building codes.
   3. (3) Mechanical piping associated with environmental air conditioning, commercial refrigeration, or process cooling or heating systems shall be installed by a licensee.

3. (c) Duct cleaning.

   1. (1) Duct cleaning and air quality testing, including biomedical testing may be performed by an unlicensed person or company if:

      1. (A) the task is limited to the air distribution system, from the discharge of the unit to the inlet of the unit;
      2. (B) no cuts are made to ducts or plenums;
      3. (C) no changes are made to electrical connections;
      4. (D) the only disassembly of any part of the system is opening or removal of access panels or doors, return air grills, or registers that are removable without cutting or removing any other part of the system; and
      5. (E) coils are cleaned in place and can be accessed without cutting or disassembly of any part of the system and no biomedical remediation is performed.
   2. (2) Biomedical testing may be performed by an unlicensed person or company. Biomedical remediation requires a license.

4. (d) Process Cooling and Heating.

   1. (1) Process cooling and heating work does not include cryogenic work.
   2. (2) Process cooling and heating is limited to work performed on piping and equipment in the primary closed loop portions of processing systems containing a primary process medium. Once a primary closed loop process system has been deactivated and rendered inert, a non-licensed person may perform repairs on piping, heat exchangers, and vessels.

5. (e) Standards

   1. (1) The standard for the practice of air conditioning and refrigeration in a municipality is the code the municipality adopted by ordinance, provided that the ordinance does not make the code less strict than the current edition of the code adopted.
   2. (2) The standards for the practice of air conditioning and refrigeration in an area where no code has been adopted is the least strict applicable provision of the current International Mechanical Code or the current Uniform Mechanical Code.

Source Note:The provisions of this §75.100 adopted to be effective July 21, 1999, 24 TexReg 5469; amended to be effective March 7, 2001, 26 TexReg 1833; amended to be effective November 5, 2001, 26 TexReg 8814.