Scale is the solid matter left after water is heated or evaporated. It forms thick deposits on heat transfer surfaces and prevents the heat from being carried off.
Scale deposits reduce water flow, cut heat transfer and cause high head pressure. The compressor works harder and draws extra current, increasing power costs and causing equipment to fail to product the designed capacity.
The life of the equipment itself is reduced. In fact, excessively high head pressure is a common cause of motor burnout which costs considerable inconvenience and money...
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