rlliary
units
Marea-Marea Weekend
Climate control 99
range
Case A: the engine management control unit (1) receives the signal for switching on the compressor (a)
directly from the climate control unit (2) and the four stage pressure switch (3): if the pressure in the re-
frigerant circuit is not correct, this signal is interrupted. Lastly, if other particular exclusion conditions are
not present (e.g. request for maximum power, idle speed, etc.), then the control unit (1) sends the com-
mand (b) to switch on the compressor (5) via the relay (4).
®
30 , 1 5
0
8685308787
i
J +30
1242-1581
Engines
1. Injection control unit
2. Climate control unit
3. Four stage pressure switch
4. Compressor relay
5. Compresor
1998-1910 JTD - 2387 JTD
Case B: the signal (a) to switch on the compressor is sent, via the climate control unit (2) to the four
stage pressure switch (3) and the thermostatic switch (6) and the compressor engagement relay (4). If
the particular conditions for switching off the compressor (5) are present (e.g. request for maximum
power, idle speed, etc.), then a signal (b), sent by the EGR control unti (1) to the remote control switch
(7), switchs off the compressor.
0
IWH
8685308787
SI
+30
87 87b308586
r + ^ i
®
EGR
0
2
3 $
1910 TD 75 (Soft) Engine
1. EGR control unit
2. Climate control unit
3. Four stage pressure switch
4. Compressor relay
5. Compressor
6. Thermal switch on water pump
7. Compressor remote control off switch
2
Print n° 506.763/17
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