AS NZS 5149.3:2016 pdf free

AS NZS 5149.3:2016 pdf free.Refrigerating systems and heat pumps – Safety and environmental requirements
Refrigerating systems sited in the open air shall be positioned to avoid refrigerant leaking into the building or endangering people. If sited on the roof, the refrigerant shall not be able to flow across the roof into any ventilation fresh air opening, doorway, trap door, or similar opening in the event of a leak. Where a shelter is provided for refrigerating equipment sited in the open air, it shall have natural or forced ventilation.
A room where at least one of the longer walls is open to the outside air by means of louvres with 75 % free area and covering at least 80 % of the wall area [or the equivalent if more than one wall is to outside) is considered as being in the open air.
When a machinery room is chosen as the location of the refrigerating equipment, it shall meet the requirements specified in 5.1 to 5.14. Where the charge of a refrigerant is above the practical limits specified in ISO 5149-1, the refrigerating system shall be located in a special machinery room unless the ignition sources in the machinery room meet the requirements of 5.3, 5.4, and 5.14.4.
NOTE 1 Additional requirements could be needed for refrigerating systems containing R-717 or other B2L, B2,B3, A2L, A2, and A3 refrigerants as specified in 5.12.
NOTE 2 Where housing around refrigerating equipment is sufficiently large for people to enter, the housing is considered as a machinery room and requirements for such rooms apply.
The ventilated enclosure containing the refrigerating system shall have a ventilation duct as specified by the manufacturer. The duct shall be no greater in length and have no more bends than the maximum number specified by the manufacturer. The room into which the ventilated enclosure is installed shall be at least 10 times the volume of the enclosure and shall have sufficient make up air to replace any exhausted air. The ventilation from the enclosure shall be to outside air or to a room having a minimum volume specified in ISO 5149-1:2014, 5.2.17 for an occupied space.AS NZS 5149.3 pdf free download.