Iveco Daily. Manual — part 350
61548
Figure 52
3. Parameters:
Check for system response by operating vehicle controls until finding the control which gives no signal on IWT screen display.
The following parameters are also checked:
- COMPRESSOR, RECYCLE, MAX DEF
PARAMETERS
FAILURES
IDENTIFICATION
MIXING KNOB POSITION
LOW
°C
MIXING MOTOR POSITION
0 %
REQUIRED TEMPERATURE
22
°C
VENTILATION KNOB POSITION
AUTO Position
AIR FLOW RATE
130 m3h
INTERNAL TEMPERATURE
29
°C
EXTERNAL TEMPERATURE
28
°C
EVAPORATOR TEMPERATURE
25
°C
BLOWN AIR TEMPERATURE
29
°C
POTENTIOMETER POWER VOLTAGE
4.65 Volt
BATTERY VOLTAGE
13.40 Volt
42
CAB AIR-CONDITIONING
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61549
Figure 53
COMPRESSOR
OFF
RECYCLE
DYNAMIC
MAX. DEF
OFF
IDENTIFICATION
PARAMETERS
FAILURES
CAB AIR-CONDITIONING
43
D
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NO
Insufficient refrigerant in the system: hiss in evaporator
housing near expansion valve.
Add refrigerant until gauges show normal pressure
values.
Excessive refrigerant in the system: noise or vibrations
in drain pipe, compressor vibrations.
Drain out the system and add refrigerant until gauges
show normal pressure values
2
YES
SYSTEM NOISY
NO
YES
NO
YES
NO
YES
NO
YES
NO
Low compressor oil level.
Check compressor oil level and refill if required.
Enough refrigerant in the system.
Add refrigerant until gauges show normal pressure
values.
Regular
clearance
between
front
plate
and
electromagnetic friction.
Check clearance, disconnect compressor if required
and adjust clearance.
Enough compressor oil level.
Check compressor oil level and refill if required.
Enough refrigerant in the system.
No moisture in the system.
Excessive moisture in the system: noisy expansion
valve.
Replace expansion valve.
44
CAB AIR-CONDITIONING
D
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FAILURE OF THE MECHANICAL TYPE
4.1
COMPRESSOR NOISE
NO
NO
YES
NO
YES
NO
NO
YES
NO
YES
NO
Proper system sealing.
Check system and compressor and remove refrigerant
leakage, if any.
Proper electromagnetic friction operation.
Check friction electrical connections and replace the
electromagnetic friction if required.
Compressor drive belt in good conditions.
Replace drive belt.
Compressor drive belt in normal working conditions.
Check and adjust belt tension.
Proper compressor screws and bolts tightening.
Check and tighten compressor screws and bolts.
Serviceable compressor.
Drain out system and replace compressor.
Serviceable electromagnetic friction pulley bearing.
Check pulley sliding and replace it if required.
YES
YES
NO
Serviceable belt tensioner.
Replace belt tensioner.
(continued)
CAB AIR-CONDITIONING
45
D
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