Elektronikon Regulated Drain (Erd) - Atlas Copco ZR 200 Instruction Book

Reference
AS
BV
Ca
Ci
Co
CV
Eh
El
MTa
MTi
OF
OP
Cooling system for ZR compressors
The cooling water flows through oil cooler (Co), the cooling jackets of high-pressure compressor
element (Eh) and low-pressure compressor element (El), as well as through intercooler (Ci) and
aftercooler (Ca).
Condensate drain
Two moisture traps are installed: one downstream of the intercooler (MTi) to prevent condensate
from entering compressor element (Eh) and one downstream of the aftercooler (MTa) to prevent
condensate from entering the air outlet pipe.
On ZR/ZT 110 up to ZR/ZT 275, the moisture traps are connected to an ERD, see section
Elektronikon Regulated
2.4

Elektronikon regulated drain (ERD)

Description
The drain consists of a capacitive sensor which is incorporated in the drain collector and of a pilot
valve which is placed outside the drain collector. A drain opening delay timer is started when the
collector is filled up to the level of the capacitive sensor. As long as the delay timer is running,
extra condensate will be collected and the level will rise even higher than the position of the
sensor. As soon as the delay timer has expired, the pilot valve (normally open) is deactivated and
the diaphragm opens the outlet, discharging the condensate. From the moment that the sensor is
not detecting any condensate anymore, a drain closing delay timer is started. The pilot valve will
still drain the condensate during the run of this timer to make sure that the remaining amount of
condensate is drained. The pilot valve is activated when the timer has expired, the outlet closes
quickly without wasting compressed air.
16
Name
Silencer
By-pass valve
Aftercooler
Intercooler
Oil cooler
Check valve
High-pressure compressor element
Low-pressure compressor element
Moisture trap, aftercooler
Moisture trap, intercooler
Oil filter
Oil pump
Drain.
Instruction book
AIF999999