Instruction book
2920 1472 03 10
1.2 Air flow (Figs. 1.6/1.7)
Air drawn through filter (AF) is compressed in low-pressure compressor element (El) and discharged
to intercooler (11). The cooled air is further compressed in high-pressure compressor element (Eh)
and discharged through pulsation damper (AS) and aftercooler (15). A check valve (CV) is provided
downstream of the pulsation damper.
1.3 Condensate drain system (Figs. 1.6/1.7)
Two condensate traps are installed: one downstream of the intercooler (MTi) to prevent condensate
from entering the high-pressure compressor element (Eh) and one downstream of the aftercooler
(MTa) to prevent condensate from entering the air outlet pipe. The condensate traps are provided with
a float valve to automatically drain condensate and with a manual drain valve.
For Full-Feature compressors with an ID dryer (Figs. 1.6), the condensate trap downstream the
aftercooler is replaced by a condensate trap (5) in the dryer.
Full-Feature compressors with an IMD dryer (Figs. 1.7) have three additional electronic water drains:
- One on the IMD
- One upstream and downstream the regeneration air cooler
1.4 Oil system (Figs. 1.6/1.7)
Oil is circulated by pump (OP) from the sump of the gear casing through cooler (16) and oil filter (OF)
towards the bearings and timing gears.
The oil system is protected by a valve that opens if the oil pressure should rise above a given value.
The valve is located in the oil filter housing.
1.5 Cooling system (Figs. 1.6/1.7)
ZT compressors
The compressors are provided with an air-cooled oil cooler (16), intercooler (11) and aftercooler (15).
An electric motor-driven fan (FN) generates the cooling air.
ZR compressors
The oil cooler, intercooler and aftercooler are water-cooled.
The water system includes three parallel circuits:
- One for the oil cooler and intercooler.
- One for the aftercooler.
- One circuit is only for compressors with an IMD dryer and contains the regeneration cooler.
Each of these circuits has a separate regulating valve (see section 3.1)
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