Conservation of fuel and power: Approved Document L, Volume 2 — Buildings other than dwellings

L1(b), L2 O N L I N E V E R S I O N 6.68 For building systems that do not satisfy paragraph 6.66 or 6.67, consideration should be given to providing centralised controls to allow the facilities manager to switch off appliances when they are not needed. Where appropriate, these should be automated (with manual override) so that energy savings are maximised. Consideration should be given to the power requirements of essential (e.g. life safety) systems. Determining the effective rated output 6.69 The effective rated output of a space heating or air conditioning system is the combined output of the equipment in the building which is provided for heating or cooling the internal space in normal operation, for the comfort of occupants. For air-conditioning systems, the effective rated output should include the combined maximum output of both of the following, as specified by the manufacturer. a. Air-conditioning systems. b. Air-conditioning systems combined with or as part of a ventilation system. For heating systems, the effective rated output should include the combined maximum output of all the following, as specified by the manufacturer. a. Primary space heating systems. b. Space heating systems combined with or as part of a ventilation system. c. Secondary space heating systems. It does not include any of the following. d. Heating or cooling equipment only intended for emergency or occasional backup use. e. Heating equipment for frost protection. f. Heating for domestic hot water. g. Heating or cooling for industrial processes. 6.70 If the building is heated through a district heat network or community heating system, the effective rated output should be based on the capacity of the equipment installed in the building, making reasonable assumptions for the operation of the district heat network or community heating system, including flow temperatures. 6.71 The effective rated output should be assessed based on the final installed capacity of the heating or air-conditioning system. When estimating the effective rated output at the design stage, designers should make allowances for the final installed capacity, including potential oversizing and equipment substitution. Building automation and control system specification 6.72 A building automation and control system installed in a new or existing building, where the building meets the space heating or cooling criteria in paragraphs 6.66 and 6.67, should be capable of carrying out all of the following functions. a. Fully complies with BS EN ISO 16484. b. Continuously monitors, logs, analyses and allows for adjusting energy use. 54 Approved Document L Volume 2, 2021 edition Building Regulations 2010 O N L I N E V E R S I O N