Design and Installation

(1)Heating, ventilating and air-conditioning systems, including mechanical refrigeration equipment, shall be designed, constructed and installed in conformance with good engineering practice such as that described in, but not limited to,

• (a) the ASHRAE Handbooks and Standards,
• (b) the HRAI Digest,
• (c) the Hydronics Institute Manuals,
• (d) the NFPA Standards,
• (e) the SMACNA Manuals,
• (f) the ACGIH manual entitled "Industrial Ventilation: A Manual of Recommended Practice for Design,"
• (g) CSA B214, "Installation code for hydronic heating systems,"
• (h) CAN/CSA-Z317.2, "Special requirements for heating, ventilation, and air-conditioning (HVAC) systems in health care facilities,"
• (i) EPA 625/R-92/016, "Radon Prevention in the Design and Construction of Schools and Other Large Buildings," and
• (j) ASHRAE Guideline 12, "Minimizing the Risk of Legionellosis Associated with Building Water Systems."

(1)Buildings classified as Group B, Division 2 or 3 occupancies or Group C residential occupancies that are intended for use in the winter months on a continuing basis shall be insulated and be equipped with heating facilities that are capable of maintaining an indoor air temperature of 22°C at the outside winter design temperature referred to in Article 6.2.1.2.

(2)All other buildings intended for occupancy in the winter months on a continuing basis should be insulated and shall be equipped with heating facilities to maintain a minimum indoor air temperature of 18°C or commensurate with the use of the building at the outside winter design temperature described in Article 6.2.1.2.

(1)The outdoor conditions to be used in designing heating, ventilating and air-conditioning systems shall be determined in conformance with MMAH Supplementary Standard SB-1, "Climatic and Seismic Data."

(1)Heating and cooling systems shall be designed to allow for expansion and contraction of the heat transfer fluid and to maintain the system pressure within the rated working pressure limits of all components of the system.

(1)Mechanical systems and equipment shall be designed and installed to accommodate the maximum relative structural movement provided for in the construction of the building.

(1)The installation of solid fuel-burning appliances for central heating systems shall comply with CSA B365, "Installation code for solid-fuel-burning appliances and equipment" and the manufacturer's installation instructions.

(2)The solid fuel-fired appliances in Sentence (1) shall conform to CSA B366.1, "Solid-fuel-fired central heating appliances."

(3)The design and installation of earth energy systems shall conform to CAN/CSA-C448.2, "Design and installation of earth energy systems for residential and other small buildings," where such systems use groundwater, submerged heat exchangers or ground heat exchangers to serve,

• (a) a house with or without a secondary unit, or,
• (b) a building, a house with or without a secondary unit, where the conditioned space is not more than 1 400 m².

(4)Except for a house with or without a secondary unit, the design and installation of earth energy systems shall conform to CAN/CSA-C448.1, "Design and installation of earth energy systems for commercial and institutional buildings," where such systems use groundwater, submerged heat exchangers or ground heat exchangers to condition a floor space area more than 1 400 m².

(5)The design and installation of solid fuel-burning stoves, ranges and space heaters, including the requirements for combustion air, shall conform to the requirements of CSA B365, "Installation code for solid-fuel-burning appliances and equipment" and the manufacturer's installation instructions.

(6)The design and installation of hydronic heating systems shall conform to

• (a) CSA B214, "Installation code for hydronic heating systems," or
• (b) good engineering practice appropriate to the circumstances such as described in Article 6.2.1.1.

(7)Solid fuel-burning stoves, furnaces and hydronic heating systems designed to burn solid fuels, other than coal, shall conform to the particulate emission limits of,

• (a) CSA B415.1, "Performance Testing of Solid-Fuel-Burning Heating Appliances," or
• (b) the "Standards of Performance for New Residential Wood Heaters," set out in Subpart AAA of Part 60 of Title 40 of the Code of Federal Regulations, published by the United States Environmental Protection Agency, as it read on March 16, 2015.

(1)Equipment requiring periodic maintenance and forming part of a heating, ventilating or air-conditioning system shall be installed with provision for access for inspection, maintenance, repair and cleaning.

(2)Mechanical equipment shall be provided with guards so as to prevent injury.

(3)Heating, ventilating or air-conditioning systems shall be protected from freezing if they may be adversely affected by freezing temperatures.

(1)Asbestos shall not be used in heating, ventilating or air-conditioning systems or equipment.

(1)Combustible tubing for pneumatic controls may be used in buildings required to be of noncombustible construction provided it has an outside diameter not exceeding 10 mm.

(1)The design, construction, installation and material alteration of every indoor incinerator shall conform to NFPA 82, "Standard on Incinerators and Waste and Linen Handling Systems and Equipment."

(1)A storage bin for solid fuel shall not be located above a sewer opening or drain opening.

(2)Storage bins for solid fuel shall be designed and constructed so that the air temperature in the bin or the surface temperature of any part of the floor or walls is below 50°C.