Atlas Copco GA 160 VSD, Instruction Book

Page: 95 / 112

8 Integrated dryer
8.1 Condensate drain system
Description
The condensate enters the Electronic Water Drain (EWD) via inlet (1) and accumulates in the water separator
of the heat exchanger and in collector (2). A capacitive sensor (3) continuously measures the liquid level. As
soon as the collector is filled up to a certain level, a drain delay timer is started. As soon as the delay time has
expired, pilot valve (4) is activated and diaphragm (5) opens outlet (6), discharging the condensate.
When the collector has been emptied, the outlet closes quickly without wasting compressed air.
When the controller registers a malfunction, the red alarm LED starts flashing, a warning appears on the
display of the regulator and the electronic drain valve will automatically change to the alarm mode, opening
and closing the valve according to a sequence as shown below. This condition continues until the fault is
remedied. If the fault is not remedied automatically, maintenance is required.
Electronic water drain
Drain frequency during alarm condition
Instruction book
APF192090 93