Importance

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Abstract

Improved control system for refrigeration-based compressed-gas dryers comprising a refrigerating circuit with a compressor (10), a condenser (12), a throttling member (14) and an evaporator (16), and further comprising a heat exchanger (22), a condensate separator (18) and a condensate drain (20), in which the compressor (10) is by-passed by a hot-gas valve (30). Control means (38, 40) are provided for measuring the temperature of the thermal mass of the dryer, or a temperature correlating therewith, and actuating the compressor (10) into switching on and off, as well as operating an electromagnetic valve (36) associated upstream of the hot-gas valve (30), accordingly, so as to selectively cause the dryer to operate as a hot-gas dryer or a thermal-mass dryer for variable period of times depending on the thermal load.

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First Claim