(1) "Refrigerated air-conditioning work" is—
(a) the construction, installation, replacement, repair, alteration, maintenance, testing or commissioning of refrigerated air-conditioning equipment associated with the heating or cooling of a building, including—
(i) any compressor, condenser, condensing unit, fan coil unit, fan and air distribution equipment, evaporator, pipework, refrigerant pipework and any tubing, motors and associated controls; and
(ii) any ductwork that is necessary for the purpose of any work described in this paragraph; and
(iii) any roof sheeting and roof flashing that is necessary for the purpose of any work described in this paragraph; and
(iv) any part of a single head split system, ceiling cassette system or any add-on condenser unit for a ducted system; and
(b) the construction, installation, replacement, repair, alteration, maintenance, testing or commissioning of a split system heat pump water heater; and
(c) any design work that is incidental to, or associated with, any work described in paragraph (a) or (b).
(2) Refrigerated air-conditioning work does not include—
(a) the connection or disconnection of refrigerated air-conditioning equipment from a water supply other than the disconnection of that equipment from a water supply at an isolating valve adjacent to a mechanical component of that equipment; or
(b) any treatment of heating or cooling water; or
(c) the connection or disconnection of a split system heat pump water heater from a water supply.