Ключевые слова:
Air-conditioning systems, Air-conditioning equipment, Absorption, Adsorption, Gas-powered devices, Heat pumps, Safety measures, Classification systems, Gases, Heat transfer, Heat transfer media, Gas valves, Control systems, Automatic control systems, Burners, Thermostats, Combustion, Calorific value, Gas circuits, Marking, Weather resistance, Instructions for use, Maintenance, Test equipment