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Instruction book
1.2.3 Oil system
Air pressure forces the oil from receiver (17) through oil coolers
(6), filters (7) and oil stop valve (15) to the compressor elements
and the lubrication points.
Oil stop valve (15) prevents the compressor element from
flooding with oil when the compressor is stopped.
Valve (26) by-passes oil coolers (6) when starting the
compressor from cold condition, to ensure rapid warming of
the oil to normal working temperature.
In air receiver (17) most of the oil is removed from the air
centrifugally. Almost all of the remaining oil is removed by
separator element (18).
1.2.4 Cooling system
On GR, the system includes air cooler (4) and oil coolers (6),
cooled by one or two fans (5) 1).
GR W are provided with a cooling water system, including a
combined oil and air cooler.
1.2.5 Regulating system
The system keeps the net pressure within programmable
pressure limits by automatically loading and unloading the
compressor depending on the air consumption. It is controlled
by Elektronikon
®
regulator (E1) which also protects the
compressor and monitors components subject to service. See
section 1.3.
Unloading
If the air consumption is less than the air delivery of the
compressor, the net pressure increases. When the net pressure
reaches the upper limit of the working pressure (unloading
pressure), solenoid valve (Y1) is de-energized. The plunger of
the valve moves downwards by spring force:
1. The plunger of solenoid valve (Y1) shuts off the supply of
receiver pressure towards chamber (8).
2. Control pressure present in chamber (8) is vented to
atmosphere through loading solenoid valve (Y1). Unloading
valve (3) closes by spring force.
3. Valve (12) is pushed downwards releasing receiver pressure
through flexible (30) and channels (10 and 29) towards the
air inlet. As long as the pressure in the air receiver is higher
1 Air filter
2 Unloader
3 Unloading valve
4 Air cooler
5 Cooling fan
6 Oil coolers
7 Oil filters
8 Chamber, control pressure
9 By-pass opening
10 Primary blow-off channel
11 Chamber, receiver pressure
12 Valve
13 Shield
14 Compressor element, low pressure
15 Oil stop valve
16 Check valve
17 Air receiver
18 Oil separator element
19 Minimum pressure valve
20 Check valve
21 Oil scavenging line
22 Safety valve
23 Oil filler plug
24 Oil level indicator
25 Oil drain plug
26 By-pass valve
27 Air outlet valve (customer’s
installation)
28 Condensate trap
29 Channel
30 Flexible, receiver pressure
31 Insulating block
32 Condensate trap
33 Liquid – gas mixer
34 Thermostatic expansion valve
35 Sight-glass
36 Filter/dryer
37 Capillary tube
38 Fan control switch
39 High pressure switch
40 Fan
41 Fan motor
42 Condenser
43 Hot gas by-pass valve
44 Refrigerant compressor
45 Liquid separator
46 Low pressure switch
47 Air/refrigerant heat exchanger
48 Air/air heat exchanger
49 By-pass valves
50 By-pass valve
51 Vent valve
52 Secondary blow-off channel
53 Compressor element, high pressure
E1 Elektronikon regulator
M1 Drive motor
Y1 Loading solenoid valve
Figs. 1.4 and 1.5 Regulating system
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