Tracked Changes. Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and process chillers, with electrically driven compressors. Requirements|Control systems, Air-conditioning equipment, Space-heating systems, Heating equipment, Liquids, Performance, Heat pumps, Performance testing, Air conditioners, Air, Water, Environment (working), Electrically-operated devices, Cooling, Condensers, Air coolers, Compressors, Air-conditioning systems, Marking, Instructions for use, Cooling equipment, Heat transfer, Refrigerating systems, Coolers