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 San Antonio
 Code of Ordinances
 Chapter 10. BUILDING-RELATED CODES
 Article VII. MECHANICAL CODE

  § 10-62. Amendments to the adopted chapters of the international mechanical code (2018).  

Latest version.

  • Additions to the International Mechanical Code (IMC) are shown as underlined text. Deletions of the IMC are shown as bracketed [ strikethroughs ].

    Section 202, GENERAL DEFINITIONS, is amended by adding the following definition:

    NFPA 70. The National Electrical Code, as amended by Article VI of this Code.

    Section 301.10, Electrical, is amended as follows:

    301.10 Electrical. Electrical wiring, controls and connections to equipment and appliances regulated by this code shall be in accordance with NFPA 70 . All wiring, including control wiring, exposed to weather shall be installed in a raceway approved for the environment.

    Section 304, INSTALLATION, is amended by adding Section 304.13 Installation at gas valve, as follows :

    304.13 Installation at gas valve. Minimum Schedule 40 metallic pipe shall be installed at the gas valve and extended a minimum of two inches outside the gas furnace and gas rooftop unit's casing and may be connected to an approved listed flexible gas connector.

    Section 306.3, Appliances in attics, is amended by adding 306.3.2 Access for cooling or heating appliance, as follows:

    306.3.2 Access for cooling or heating appliance. For new one-and two-family residential occupancies and townhomes, the attic space in which any cooling or heating appliance is installed shall be provided with a permanent ladder, [or] fold-away ladder or direct access door.

    Section 307.2.1, Condensate disposal, is deleted and replaced with the following text :

    307.2.1 Condensate disposal. Condensate disposal shall be in accordance with Chapter 34, Section 34-274 of the City Code of San Antonio. [ Condensate from all cooling coils and evaporators shall be conveyed from the drain pan outlet to an approved place of disposal. Such piping shall maintain a minimum horizontal slope in the direction of discharge of not less than one-eighth unit vertical in 12 units horizontal (1-percent slope). Condensate shall not discharge into a street, alley or other areas so as to cause a nuisance. ]

    Section 307.2.2, Drain pipe materials and sizes, is amended as follows; All other code text remains as is:

    307.2.2 Drain pipe materials and sizes . Components of the condensate disposal system shall be cast iron, galvanized steel, copper, copper alloy, cross-linked polyethylene, polyethylene, ABS, CPVC, PVC or polypropylene pipe or tubing. Components shall be selected for the pressure and temperature rating of the installation. Joints and connections shall be made in accordance with the applicable provisions of Chapter 7 of the International Plumbing Code relative to the material type. Condensate waste and drain line size shall be not less than ¾-inch internal diameter and shall not decrease in size from the drain pan connection to the place of condensate disposal. Where the drain pipes from more than one unit are manifolded together for condensate drainage, the pipe or tubing shall be sized in accordance with Table 307.2.2. Primary drain lines located in any unconditioned space, except for crawl spaces, shall be insulated with foam plastic rubber based insulation or approved material with a minimum thickness of 3/8 inch.

    Section 307.2.4.1, Ductless mini-split system traps, is amended as follows:

    307.2.4.1 Ductless mini-split system traps. Ductless mini-split equipment that produces condensate shall be [ provided with an in line check valve located in the drain line, or a trap] in accordance with their manufacturers' recommendations.

    Section 505.6, Other than Group R, is amended as follows:

    505.6 Other than Group R. In other than Group R occupancies, where domestic cooktops, ranges, and open-top broilers are used for domestic purposes, domestic cooking exhaust systems shall be provided. Portable fire extinguishers shall be installed at each cooking appliance per IFC Section 906.

    Section 606.2, Where required, is amended as follows; All other code text remains as is:

    606.2 Where required. Smoke detectors shall be installed where indicated in Section 606.2.1 through 606.2.3 or in accordance with NFPA 90A "Standard for the Installation of Air Conditioning and Ventilating Systems."

    Section 1101.10, Locking access port caps, is amended by adding Exception 2 to read as follows:

    1101.10 Locking access port caps. Refrigerant circuit access ports located outdoors shall be fitted with locking-type tamper-resistant caps or shall be otherwise secured to prevent unauthorized access.

    Exception s :

    1.

    This section shall not apply to refrigerant circuit access ports on equipment installed in controlled areas such as on roofs with locked access hatches or doors.

    2.

    A locking-type tamper-resistant cap is not required when refrigerant circuits are located in a yard fully enclosed with a permanent barrier, fence, or combination thereof no less than 6 feet in height and obstructs unauthorized access.

    Section 1102.3, Access port protection, is deleted.

    [ 1102.3 Access port protection. Refrigerant access ports shall be protected in accordance with Section 1101.10 whenever refrigerant is added to or recovered from refrigeration or air-conditioning systems .]

    Section 1107.4, Condensation, is amended by adding 1107.4.1, Air Conditioning and refrigeration pipe, as follows:

    1107.4.1 Air Conditioning and refrigeration pipe. Air conditioning and refrigeration pipe and tubing insulation for refrigerant vapor (suction) lines located in any location where condensate will occur shall be insulated with insulation of the ACR type having a thermal resistivity of not less than R-4. Insulation shall be labeled and identified by the manufacturer.

(Ord. No. 2018-06-21-0493 , § 1, 6-21-18)