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The technical documentation covers the AIR WATER HEATERS IN EPP CASING HC-3S SERIES, including models HC 20-3S, HC 30-3S, HC 35-3S, HC 45-3S, HC 50-3S, HC 70-3S, and HC 80-3S. The documentation provides information on precautions, transport, package content, use, device characteristics, assembly, installation instructions, precautions and warnings, controls, connection schemes, and terms of warranty. The device characteristics include construction and principle of operation, device dimensions, and device technical data. The technical data includes nominal heating capacity, heating capacity range, maximum airflow, maximum horizontal range, number of rows, capacity of water, maximum temperature of working fluid, maximum working pressure, connection diameter, supply voltage, supply frequency, rated motor current, motor speed, motor power, protection degree, net weight, and noise. The documentation also provides parameters for supply/return water temperature, dry bulb air inlet temperature, heating capacity, dry bulb air outlet temperature, water flow, and pressure drop in the heat exchanger for each model.