Iveco Stralis AT/AD. Manual — part 321
III.68
ELECTRONIC SYSTEMS
S
TRALIS
AT/AD
Base - January 2003
1)
Burner motor
2)
Flame sensor
3)
Combustion chamber
4)
Burner control unit
5)
Ignition spark plug
6)
Water temperature sensor
7)
Flame pipe
8)
Heat exchanger
9)
Overheating sensor
10)
Water pump
11)
Silencer
12)
Air suction pipe
13)
Fuel batching pump
14)
Bed Module unit
15)
Automatic Webasto air conditioner electronic unit
16)
Cabin/engine heating and heater connecting switch
17)
Air conditioner control dashboard for manual version
18)
Cluster
Connection to circuit
WE.
Water inlet
WA.
Water outlet
V.
Comburent air inlet
B.
Fuel supply
A.
Exhaust gases outlet
ELECTRONIC SYSTEMS
III.69
S
TRALIS
AT/AD
III.70
ELECTRONIC SYSTEMS
S
TRALIS
AT/AD
Base - January 2003
It is assembled on the right vehicle side near the burner and has been inserted in order to allow quickly heating the
cabin when the engine is off.
It is equipped with a temperature-sensitive membrane calibrated at 65
°C.
With temperature < 65 _C water will only circulate in cabin (small circuit).
With temperature > 65 _C the thermostat switches its position, allowing water to circulate both in cabin and in engine,
heating them both (big circuit).
3-WAY SOLENOID VALVE
In the WEBASTO air conditioning system there is a single 3-way solenoid valve that performs the function of batching
and bypassing cooling water from engine to radiator inside the cabin.
The valve is placed next to the front left side of the engine (driver side).
It is of the Normally Open type at rest and is supplied by a direct battery positive.
The electronic unit, by providing it with a mass, adjusts its working cycle (Duty-Cicle).
WATER PUMP
The water pump is directly assembled on the lower part of the burner.
It is used to circulate the engine cooling water in the circuit.
The supply voltage is 24 Volt.
The minimum flow rate is about 500 l/h.
FUEL BATCHING PUMP
It is assembled on the chassis next to fuel tanks with a slant of 15
° to facilitate air drain. It is used to take and inject gas
oil inside the burner.
The unit supplies the pump with a pulse signal.
For a correct operation the internal delivery pipe diameter must be 2 mm and must not exceed the length of 5 meters.
It embeds a small fueld filter and a unidirectional check valve.
The fuel flow rate is about 0.2 l/min.
ELECTRONIC SYSTEMS
III.71
S
TRALIS
AT/AD
WATER TEMPERATURE SENSOR
It is a PTC sensor assembled on heat exchanger; it measures different water temperatures in order to adjust the burner
power and, only in manual version, upon reaching 55 ˚C, it allows connecting the fans.
The sensor resistance at 20 _C is ~950 Ohm.
FLAME SENSOR
It is a PTC sensor assembled inside the combustion chamber next to the exhaust gas outlet and measures the current
temperature, in order to disconnect the spark plug in case the burner has not been turned on.
It disconnects the spark plug at an exhaust gas temperature of about 700_C
The sensor resistance at 20 _C is ~1080 Ohm.
IGNITION SPARK PLUG
It is a resistance placed inside the combustion chamber.
The unit supplies it with pulses through an internal electronic regulator.
The rated operating voltage is 18 Volt to allow its operation also with battery voltages of ~ 22 Volt.
The resistance at 20 _C must be < 2 Ohm.
OVERHEATING SENSOR
It is a temperature sensor assembled on the heat exchanger, it measures the different water temperatures to possibly
disconnect the burner upon reaching about 115
°C
In case of intervention the sensor restores itself autonomously. It is not of the manual restoring type.
The sensor resistance at 20
°C is ~ 10 K Ohm.
BURNER MOTOR
It is embedded into the assembly in the rear burner part.
The rotation speed is managed by the unit by means of an integrated electronic regulator.
It embeds an inductive sensor that measures the engine rotation speed.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст