6.2.1.

(1) Heating, ventilating and air-conditioning systems, including related mechanical refrigeration systems, shall be designed, constructed and installed to conform to good engineering practice appropriate to the circumstances such as described in,

(a) the ASHRAE Handbooks as follows:

(i) Fundamentals,

(ii) Refrigeration,

(iii) HVAC Applications,

(iv) HVAC Systems and Equipment, and

(v) ANSI/ASHRAE/IESNA 90.1, “Energy Efficient Design of New Buildings Except Lowrise Residential Buildings”.

(b) the CAN/CSA-F280-M, “Determining the Required Capacity of Residential Space Heating and Cooling Appliances”, and the outside winter design temperatures shall conform to Supplementary Standard SB-1,

(c) the CAN/CSA-F326-M, “Residential Mechanical Ventilation Systems”,

(d) the NFPA Fire Codes,

(e) the HRAI Digest,

(f) the Hydronics Institute Manuals,

(g) the SMACNA Manuals,

(h) the ACGIH Industrial Ventilation Manual,

(i) CAN/CSA-Z317.2, “Special Requirements for Heating, Ventilation, and Air Conditioning (HVAC) Systems in Health Care Facilities”, and

(j) the Model National Energy Code for Buildings.

(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 6.2.1.8.

(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 6.2.1.8.

(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 CAN/CSA-B365-M, “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 CAN/CSA-B366.1-M, “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) single dwelling units, or

(b) buildings where the conditioned space is not more than 1 400 m².

(4) 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 1400 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 CAN/CSA-B365-M, “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) CAN/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.v1

(1) Fireplaces shall conform to the requirements of Section 9.22.

(1) Except as provided in Sentence (2), heat recovery ventilators with rated capacities of not less than 25 L/s and not more than 200 L/s shall be installed in accordance with Article 9.32.3.11.

(2) Where electric space heating, other than forced-air electric heating system, is provided in buildings of residential occupancy within the scope of Part 9, the mechanical ventilation system shall include heat recovery ventilators designed to provide the greater of,

(a) the minimum rated efficiency required by the Energy Efficiency Act, or

(b) a minimum 55% sensible heat recovery efficiency when tested to the low temperature thermal and ventilation performance test method set out in CAN/CSA-C439, “Test for Rating the Performance of Heat/Energy-Recovery Ventilators”, at a Station 1 test temperature of -25°C at an air flow not less than 30 L/s.

(1) The outside conditions to be used in designing heating, ventilating and air-conditioning systems shall be determined in conformance with Supplementary Standard SB-1.

(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 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) 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) Asbestos shall not be used in air distribution systems or equipment in a form or in a location where asbestos fibres could enter the air supply or return systems.

(1) Any covering of an access opening through which a person could enter shall be openable from the inside without the use of keys where there is a possibility of the opening being accidentally closed while the system or equipment is being serviced.

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