All components containing refrigerant shall be located either outdoors or in a machinery room when the quantity of refrigerant in an independent circuit of a system exceeds the amounts shown in Table 18-28-1103.1. For refrigerant blends not listed in Table 18-28-1103.1, the same requirement shall apply when the amount for any blend component exceeds that indicated in Table 18-28-1103.1 for that component. This requirement shall also apply when the combined amount of the blend components exceeds a limit of 69,100 parts per million by volume. Machinery rooms required by this section shall be constructed and maintained in accordance with Section 1105 for Group Al and B1 refrigerants and in accordance with Sections 18-28-1105 and 18-28-1106 for Group A2, B2, A3 refrigerants.
Exceptions:
1. Machinery rooms are not required for listed equipment or appliances containing not more than 6.6 pounds (3 kg) of refrigerant, regardless of the refrigerant's safety classification, where installed in accordance with the equipment's or appliance's listing and the equipment or appliance manufacturer's installation instructions.
2. Piping in conformance with Section 18-28-1107 is allowed in other locations to connect components installed in a machinery room with those installed outdoors.