LIMITING INFILTRATION
J4.1* The infiltration of air into a building must be limited as far as is reasonably practicable by -
a. sealing dry lining junctions between walls, ceilings and floors, and at window, door and roof space openings;
b. sealing vapour control membranes in timber framed and other framed panel constructions;
c. sealing at service penetrations of the fabric or around boxing for services; and
d. fitting draught stripping in the frames of openable elements of windows, doors and rooflights.
CENTRAL HEATING CONTROLS
J5.1* A central heating system in a building must have -
a. in a system using a boiler, an automatic control which shuts the boiler off when heat is not required or, if it is a solid fuel boiler, reduces the firing to the minimum burning rate;
b. a means of controlling the temperature in spaces being heated e.g. room thermostats, thermostatic radiator valves or any other appropriate temperature sensing devices to control the temperatures in those areas that require different temperatures (e.g. separate living and sleeping areas in dwellings). A system fitted solely with thermostatic radiator valves must be fitted with flow control or similar devices to prevent boiler cycling;
c. for a system with an output of not more than 100 kW, a manually adjustable automatic timing device or devices to control the periods of operation; and
d. for a system with an output of more than 100 kW,
i. a control arrangement which will give start times appropriate to the rate at which the building will respond when the heating is restarted after being shut off (optimising control; controls may also be provided which will allow sufficient heating to prevent damage to the building structure, services or contents, by frost, excessive humidity or condensation),
ii. where the system uses hot water, an external temperature sensing device (weather compensating control) to regulate the temperature of the water flowing in the heating circuit, and
iii. where the system has two or more gas or oil fired boilers which can work together to supply the heat demand, boiler controls which can detect variations in the need for heat in the building and start, stop, or modulate the boilers as required (sequence control). In addition hydraulic design must ensure stable control.
CONTROLS FOR HOT WATER STORAGE VESSELS
J5.2* A storage vessel must have a heat exchanger which has sufficient capacity for effective control; and a vessel (other than one providing the slumber load for a solid fuel fired boiler) must have, either separately, or as part of the central heating system -
a. an adjustable thermostat which, in the case of a hot water central heating system, must be
interconnected with any central heating thermostats to switch the boiler off when heat is not required; andb. an adjustable automatic timing device or devices to control the period of operation.
INSULATION OF HOT WATER STORAGE VESSELS
J5.3* Hot water storage vessels must be adequately insulated against heat loss,
except -
insulation to safety fittings on unvented systems must not impede safe operation or visibility of warning discharges.
INSULATION OF PIPES AND DUCTS
J5.4* Heating and hot water pipes and warm air ducts must
be adequately insulated against heat loss,
except -
a. where the heat loss will contribute to the requirements of the room or space; or
b. where systems heat or store water for an industrial process.
ARTIFICIAL LIGHTING
J6.1* A building or part of a building of purpose groups 2 to 7 not excluded by Regulation 22(2) must have artificial lighting systems constructed to use no more power than is reasonably practicable,
except -
a. for emergency lighting or display lighting installed to highlight displays of exhibits or merchandise, and
b. for buildings with a floor area of 100 m2 or less.
SWITCHING FOR ARTIFICIAL LIGHTING
J6.2* An artificial lighting system in a building of purpose groups 2 to 7 not excluded by Regulation 22(2) must have switching arrangements which provide a reasonably practicable means of energy efficient control.