Controls for Heating, Ventilation and Air Conditioning Systems

The following provisions should be made for heating, ventilation and air conditioning system controls – (a) the fixed building services system(s) should be subdivided into separate control zones to correspond to each area of the building that has a significantly different solar exposure, or occupancy period or type of use; (b) each separate control zone should be capable of independent timing and temperature control and, where appropriate, ventilation and air circulation rate; (c) the service should respond to the requirements of the space it serves. Where both heating and cooling are provided, they should be controlled so as not to operate simultaneously; and (d) central plant should operate only as and when the zone systems require it. The default condition should be "off".