Reference Name
Ci1 Pre-intercooler
Ci Intercooler
Co Oil cooler
CV Check valve
Eh High-pressure compressor element
El Low-pressure compressor element
FN Fan
MTa Moisture trap, aftercooler
MTi Moisture trap, intercooler
OF Oil filter
OP Oil pump
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).
In case of a Full-Feature compressor, cooling water is also provided to the additional regeneration cooler of
the integrated dryer.
Cooling system for ZT compressors
The compressors are fitted with an oil cooler (Co), intercoolers (Ci1 and Ci) and aftercoolers (Ca1 and Ca).
The coolers are air-cooled, the cooling air is generated by fan (FN).
In case of a Full-Feature compressor, an additional regeneration cooler is mounted (in the integrated dryer).
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.
A Full-Feature compressor also contains condensate traps downstream of the dryer:
• two traps, in case of a water-cooled compressor
• three traps, in case of an air-cooled compressor.
On ZR/ZT 110 up to ZR/ZT 275, the moisture traps are connected to an ERD, see section Elektronikon
Regulated Drain.
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
Instruction book
2920 1815 04 27
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