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Municipal Code of Chicago
MUNICIPAL CODE OF CHICAGO
TITLE 1 GENERAL PROVISIONS
TITLE 2 CITY GOVERNMENT AND ADMINISTRATION
TITLE 3 REVENUE AND FINANCE
TITLE 4 BUSINESSES, OCCUPATIONS AND CONSUMER PROTECTION
TITLE 5 HOUSING AND ECONOMIC DEVELOPMENT
TITLE 6 HUMAN RIGHTS*
TITLE 7 HEALTH AND SAFETY
TITLE 8 OFFENSES AFFECTING PUBLIC PEACE, MORALS AND WELFARE
TITLE 9 VEHICLES, TRAFFIC AND RAIL TRANSPORTATION
TITLE 10 STREETS, PUBLIC WAYS, PARKS, AIRPORTS AND HARBORS
TITLE 11 UTILITIES AND ENVIRONMENTAL PROTECTION
TITLE 12 RESERVED
TITLE 13 BUILDINGS AND CONSTRUCTION
TITLE 14 RESERVED*
TITLE 14A ADMINISTRATIVE PROVISIONS OF THE CHICAGO CONSTRUCTION CODES*
TITLE 14B BUILDING CODE*
TITLE 14C CONVEYANCE DEVICE CODE*
TITLE 14E ELECTRICAL CODE*
TITLE 14F FIRE PREVENTION CODE*
TITLE 14G FUEL GAS CODE*
TITLE 14M MECHANICAL CODE*
TITLE 14N 2022 ENERGY TRANSFORMATION CODE*
TITLE 14P PLUMBING CODE*
TITLE 14R BUILDING REHABILITATION CODE*
TITLE 14X MINIMUM REQUIREMENTS FOR EXISTING BUILDINGS*
TITLE 15 FIRE PREVENTION
TITLE 16 LAND USE
TITLE 17 CHICAGO ZONING ORDINANCE
TITLE 18 BUILDING INFRASTRUCTURE
CHAPTER 18-11 RESERVED*
CHAPTER 18-13 RESERVED*
CHAPTER 18-14 BUILDING ENERGY USE BENCHMARKING
CHAPTER 18-27 RESERVED*
CHAPTER 18-28 MECHANICAL SYSTEMS*
Article I. Administration (18-28-101 et seq.)
Article II. Definitions (18-28-201 et seq.)
Article III. General Regulations (18-28-301 et seq.)
Article IV. Ventilation (18-28-401 et seq.)
Article V. Exhaust Systems (18-28-501 et seq.)
Article VI. Duct Systems (18-28-601 et seq.)
Article VII. Combustion Air (18-28-701 et seq.)
Article VIII. Chimneys and Vents (18-28-801 et seq.)
Article IX. Specific Appliances, Fireplaces and Solid Fuel-Burning Equipment (18-28-901 et seq.)
Article X. Boilers, Water Heaters and Pressure Vessels (18-28-1001 et seq.)
Article XI. Refrigeration (18-28-1101 et seq.)
18-28-1101 General.
18-28-1101.1 Scope.
18-28-1101.2 Factory-built equipment and appliances.
18-28-1101.3 Protection.
18-28-1101.4 Fuel gas connection.
18-28-1101.5 Signage - General.
18-28-1101.6 Condensate disposal.
18-28-1101.7 General.
18-28-1101.8 Ammonia dump valve.
18-28-1101.9 Maintenance.
18-28-1101.10 Location of condensing unit.
18-28-1101.11 Prohibited locations.
18-28-1101.12 General limitations.
18-28-1101.13 Refrigerant discharge.
18-28-1101.14 Safety equipment.
18-28-1101.15 Recirculation of water used for cooling purposes.
18-28-1101.16 Change in refrigerant type.
18-28-1102 System Requirements.
18-28-1102.1 General.
18-28-1102.2 Refrigerants.
18-28-1102.2.1 Mixing.
18-28-1102.3 Pressure relief.
18-28-1102.3.1 Discharge piping.
18-28-1102.3.2 Sizing.
18-28-1103 Refrigeration System Classification.
18-28-1103.1 Refrigerant classification.
18-28-1103.2 Occupancy classification.
18-28-1103.2.1 Institutional systems - general.
18-28-1103.2.2 Industrial systems - general.
18-28-1103.2.3 Commercial systems - general.
18-28-1103.2.4 Multiple dwelling systems - general.
18-28-1103.3 System classification.
18-28-1103.3.1 Low-probability systems.
18-28-1103.3.2 High-probability systems.
18-28-1104 System Application Requirements.
18-28-1104.1 General.
18-28-1104.2 Machine room.
18-28-1104.2.1 Institutional occupancies.
18-28-1104.2.2 Industrial occupancies and refrigerated rooms.
18-28-1104.2.3 Multiple dwelling location provisions.
18-28-1104.3 Refrigerant restrictions.
18-28-1104.3.1 Air-conditioning for human comfort.
18-28-1104.3.2 Nonindustrial occupancies.
18-28-1104.3.3 All occupancies.
18-28-1104.3.4 Protection from refrigerant decomposition.
18-28-1104.4.
18-28-1104.4.1 Nonconnecting spaces.
18-28-1104.4.2 Ventilated spaces.
18-28-1104.4.3 Closures.
18-28-1104.4.4 Plenums.
18-28-1104.4.5 Supply and return ducts.
18-28-1105 Machinery Room General Requirements.
18-28-1105.1 Access.
18-28-1105.2 Dimensions.
18-28-1105.3 Doors.
18-28-1105.4 Openings.
18-28-1105.5 Refrigerant detector.
18-28-1105.6 Tests.
18-28-1105.7 Fuel-burning appliance.
18-28-1105.8 Ventilation.
18-28-1105.8.1 Discharge location.
18-28-1105.8.2 Make-up air.
18-28-1105.8.3 Quantity - Normal ventilation.
18-28-1105.8.4 Quantity - Emergency conditions.
18-28-1105.9 Termination of relief devices.
18-28-1105.10 Ammonia discharge.
18-28-1105.11 Safety equipment.
18-28-1106 Machinery Room Special Requirements.
18-28-1106.1 General.
18-28-1106.2 Elevated temperature.
18-28-1106.3 Construction requirements.
18-28-1106.4 Opening protectives.
18-28-1106.5 Pipe penetrations.
18-28-1106.6 Deliberately omitted.
18-28-1106.7 Reserved.
18-28-1106.8 Ammonia room ventilation.
18-28-1106.9 Flammable refrigerants.
18-28-1106.10 Remote controls.
18-28-1106.10.1 Refrigeration system.
18-28-1106.10.2 Ventilation system.
18-28-1106.11 Fireman's dump system.
18-28-1106.12 Hand-operated emergency valves.
18-28-1106.12.1 Hand-operated emergency valve discharge - Group 1 refrigerants.
18-28-1106.13 Provisions for discharge of refrigerants.
18-28-1107 Refrigerant Piping.
18-28-1107.1 General.
18-28-1107.2 Pipe enclosures.
18-28-1107.2.1 Location prohibition.
18-28-1107.3 Condensation.
18-28-1107.3.1 Cooling coil condensation requirements.
18-28-1107.4 Materials for refrigerants pipe and tubing.
18-28-1107.4.1 Steel pipe.
18-28-1107.4.2 Copper and brass pipe.
18-28-1107.4.3 Copper tube.
18-28-1107.4.4 Copper tube joints.
18-28-1107.4.5 Aluminum tube.
18-28-1107.5 Joints and refrigerant-containing parts in air ducts.
18-28-1107.6 Exposure of refrigerant pipe joints.
18-28-1107.7 Stop valves.
18-28-1107.7.1 Liquid receivers.
18-28-1107.7.2 Copper tubing.
18-28-1107.7.3 Identification.
18-28-1108 Field Test.
18-28-1108.1 General.
Article XII. Hydronic Piping (18-28-1200 et seq.)
Article XIII. Fuel Oil Piping and Storage (18-28-1301 et seq.)
Article XIV. Fuel-Gas Piping (18-28-1401 et seq.)
Article XV. Solar Thermal Systems (18-28-1501 et seq.)
CHAPTER 18-29 PLUMBING*
CHAPTER 18-30 RESERVED*
CHAPTER 18-31 RESERVED*
CHAPTER 18-32 RESERVED*
CHAPTER 18-36 REFERENCE STANDARDS*
APPENDIX TO THE MUNICIPAL CODE OF CHICAGO (RESERVED)*
TABLES
Chicago Zoning Ordinance and Land Use Ordinance
CHICAGO ZONING ORDINANCE AND LAND USE ORDINANCE
TITLE 16 LAND USE
TITLE 17 CHICAGO ZONING ORDINANCE
18-28-1012.3 Reserved.
Editor's note – Coun. J. 9-14-21, p. 35949, Art. X, § 8, repealed § 18-28-1012.3, which pertained to high pressure boiler inspection and repair.
18-28-1013 Reserved.
Editor's note – Coun. J. 9-14-21, p. 35949, Art. X, § 9, repealed § 18-28-1013, which pertained to carbon monoxide detector.
Article XI. Refrigeration (18-28-1101 et seq.)
18-28-1101 General.
18-28-1101.1 Scope.
   This article shall govern the design, installation, construction and repair of refrigeration systems that vaporize and liquefy a fluid during the refrigeration cycle. Refrigerant piping design and installation, including pressure vessels and pressure relief devices, shall conform to this article. Permanently installed refrigerant storage systems and other components shall be considered as part of the refrigeration system to which they are attached.

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