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

O N L I N E V E R S I O N AA Commissioning When, after all or part of a fixed Direct-fired circulator A domestic hot water building service or on-site electricity generation system in which the water is supplied to the draw- system has been installed, replaced or altered, the off points from a hot water vessel in which water is system is taken from a state of static completion heated by combustion gases from a primary energy to working order. Testing and adjusting are carried source. The unit has no storage volume, as water is out for fixed building services, as necessary, to stored in a supplementary storage vessel. ensure that the whole system uses no more fuel Direct-fired continuous flow A domestic hot and power than is reasonable in the circumstances. water system in which the water is supplied to the Testing and adjusting are carried out for on-site draw-off points from a device in which cold water electricity generation systems, as necessary, is heated by combustion gases from a primary to ensure that the whole system produces the energy source as it flows through the water maximum amount of electricity that is reasonable heater. The water heater is close to the draw-off in the circumstances. points. The unit has no storage volume, as water For each system, commissioning includes all of the is instantaneously heated as it flows through the following. device. • Setting to work. Direct-fired storage A domestic hot water system in which the water is supplied to the draw-off • Regulation (that is, testing and adjusting points from an integral hot water vessel in which repetitively) to achieve the specified water is heated by combustion gases from a performance. primary energy source. • Calibration. Display lighting Lighting to highlight displays of • Setting up and testing the associated automatic exhibits or merchandise, or lighting used in spaces control systems. for public leisure and entertainment, such as dance • Recording the system settings and the halls, auditoria, conference halls, restaurants and performance test results that have been cinemas. accepted as satisfactory. Display window An area of glazing, including Community heating system A system that supplies glazed doors, to display products or services on heat from a central source within a single building, offer to the public within a building, positioned as for example to both dwellings and non-dwellings in all of the following. in a mixed-use building. • At the external perimeter of the building. Consequential improvements Those energy • At an access level. efficiency improvements required by regulation 28. • Immediately adjacent to a pedestrian Control zone Refers to the independent control thoroughfare. of rooms or areas within buildings that need to be If there is a permanent workspace within one heated to different temperatures at different times. glazing height of the window, this cannot be Controlled service or fitting Defined in regulation considered to be a display window. Glazing more 2(1) as a service or fitting in relation to which than 3m above an access level should not be Part G [sanitation, hot water safety and water considered part of a display window, except where efficiency], H [drainage and waste disposal], J either of the following applies. [combustion appliances and fuel storage systems], • The products on display require a greater height L [conservation of fuel and power] or P [electrical of glazing. safety] of Schedule 1 imposes a requirement. 8855 BBuuiillddiinngg RReegguullaattiioonnss 22001100 AApppprroovveedd DDooccuummeenntt LL VVoolluummee 22,, 22002211 eeddiittiioonn O N L I N E V E R S I O N