Iveco Stralis AT/AD. Manual — part 269
Positioned on the front of the vehicle (driver’s side) so as to be affected by a temperature closer to reality.
Figure 9
77566
Figure 10
77145
Compressor
The compressor is situated in the engine bay between the radiator fan and the alternator.
10
BODYWORK AND CHASSIS FRAME
S
TRALIS
AT/AD
Base - January 2003
NIPPONDENSO
ND10 PA 17
Coolant
R134A
Type of lubricant oil
ND80
Coolant quantity in system
700g
Oil quantity in compressor
200 cc.
Figure 11
The dehumidifier filter is integrated in the condenser that is found on the front of the vehicle.
The refrigeration system uses R134a fluid highlighted on the plate on its casing.
The safety pressure switch assembly with four levels is fitted on the condenser outlet pipe.
The two pressure switches, which are of the N/C and N/O type, make it possible to keep the pressure in the system constant
from a minimum of 2.5 (N/O) to a maximum of 25 bars (N/C); with values outside this range the system is deactivated.
Whereas, the two pressure switches of the N/O type are used to disconnect the engine cooling fan coil when the system pressure
is in the interval 18
÷ 22 bars. This is accomplished by an earth signal that the two pressure switches supply to the Body Computer
control unit.
77245
Figure 12
77560
74247
BODYWORK AND CHASSIS FRAME
11
S
TRALIS
AT/AD
Condenser and safety pressure switches
The recirculation reduction unit is located on Heater/Conditioner unit.
It is directly activated by the electronic central unit with rated voltage (24 V) and it has 20 to 40 mA absorption.
Maximum absorption, on arriving at end of stroke, reaches 200 mA at power supply put off by the central unit.
The potentiometer it is provided with is used for return signal and, on first power on, the central unit detects and stores end of
stroke values used to split operation range.
N.B.
If the reduction unit is being replaced, it is NECESSARY to RESET system.
Figure 13
77571
Figure 14
77573
77572
Pin-out
12
BODYWORK AND CHASSIS FRAME
S
TRALIS
AT/AD
Base - January 2003
PIN
CABLE COLOUR
SIGNAL
1
White
+/- 24V
2
Purple
+/- 24V
3
Blue
0V
4
Orange
0
÷ 5V
5
Green
+ 5V
6
---
Free
The sensor inside the evaporator causes the compressor to turn on and off, allowing temperatures from 2
°C (off) to 3.5°C (on)
for VALEO and from 5
°C (off) to 10°C (on) for WEBASTO.
The figure shows the same characteristics of the outside temperature sensor except for the connection.
Figure 15
77793
Figure 16
Expansion valve
C
O
N
D
E
N
S
E
R
E
V
A
P
O
R
A
T
O
R
The expansion valve is the type with a block, its job is
to lower the pressure of the fluid at the outlet of the
condenser (and therefore of the filter) to a pre-set
value so that the same fluid, circulating in the
evaporator, can be drawn up by the compressor in a
totally gaseous form.
It is therefore possible to state that the expansion valve
fulfils three basic functions:
S
METERING
S
MODULATING
S
CHECKING
This is fitted on the Heater/Air-conditioner assembly
near the blower control module.
77575
BODYWORK AND CHASSIS FRAME
13
S
TRALIS
AT/AD
Evaporator temperature sensor
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