BS EN 15500-1. Control for heating, ventilating & air-conditioning applications. Part 1. Electronic individual zone control equipment. Modules M3-5, M4-5, M5-5 Control equipment, Control systems, Controllers, Electronic equipment & components, Buildings, Thermal environment systems, Space-heating systems, Ventilation, Air-conditioning systems, Electric heaters, Hot-water central heating, Air-conditioning equipment, Temperature control, Performance testing, Approval testing