the blow-off silencer (US). The check valve (CV) prevents that compressed air downstream of the
check valve is blown off.
References used in all flow diagrams
(1) Air inlet (3) Oil flow (5) Air outlet (7) Refrigerant gas
(2) Air flow (4) Water flow (6) Refrigerant fluid
References used for the compressor
Ref. Description Ref. Description
AF Air filter AS Pulsation damper
IS Inlet silencer CV Check valve
US Blow-off silencer Ca Aftercooler with integrated drain collector
UA Unloader assembly EWDa Electronic drain, aftercooler
El Low-pressure compressor element OP Oil pump
Ci Intercooler with integrated drain collector GC Oil sump (gear casing)
EWDi Electronic drain, intercooler Co Oil cooler
Eh High-pressure compressor element OF Oil filter
FN1 Cooling fan (ZT) AV Air outlet valve
2.3 Condensate drain system
Figures: see section Air Flow.
Compressor
Two condensate traps are installed on the compressor itself: one downstream of the intercooler
to prevent condensate from entering the high-pressure compressor element (Eh), the other one
downstream of the aftercooler to prevent condensate from entering the air outlet pipe.
On ZT, the condensate traps are integrated in the intercooler and the aftercooler outlet collector
and are connected to a no-loss electronic water drain (EWDi and EWDa).
Electronic water drains (EWD)
The condensate is collected in the electronic water drains. A sensor continuously measures the
liquid level. As soon as the collector is filled up to a certain level, the outlet opens, discharging
the condensate. When the collector has been emptied, the outlet closes quickly without wasting
compressed air.
Testing the electronic water drains can be done by pressing the test button (1) on top of the
drain. Check that the valve opens for condensate discharge.
Instruction book
14 API797429
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