Iveco Daily. Manual — part 419

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DETAIL OF AIR DISTRIBUTION KNOB

A

B

C

D

E

F

A. Face area vents

B. Face and floor area vents

C. Floor area vents

D. Floor and windscreen area vents

E. Windscreen area vents

F. Max def" function

CLIMATE CONTROL SYSTEM CONTROLS ASSEMBLY

1. Knob for setting required temperature - 2. Fan speed control knob - 3. Air distribution knob - 4. Eco" function switch -

5. inside temperature sensor - 6. Re-circulation knob

1

2

3

4

5

6

Figure 230

Figure 231

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Setting the required temperature
To set the required temperature, turn the corresponding

knob (Figure 232) to the 18 °C - 30 °C range.
This knob is connected to a potentiometer which detects the

different angular positions and transmits a signal to the

electronic control unit.
There are fifteen different positions (one per degree

centigrade) with two extremes LO" and HI" which

correspond respectively to the coldest and warmest

positions.

Setting the fan speed
To set the required fan speed, turn the corresponding knob

(Figure 233) to the 0 to 4 range.
This knob is connected to a potentiometer which detects the

different angular positions and transmits a signal to the

electronic control unit.
There are six different positions, four of which are set

manually (1, 2, 3, and 4), one for no air flow (0) and an

automatic one controlled by the electronic control unit

where the system itself selects the most suitable air flow to

reach and/or maintain the required temperature (AUTO).

KNOB FOR SETTING REQUIRED TEMPERATURE

KNOB FOR SETTING FAN SPEED

Figure 232

Figure 233

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the control unit will be able to control:
- The air temperature at the vents.
- Fan speed.
Function 0" (OFF)
With the ventilation control knob in the 0" position, the

control unit acts as follows:
- No air flow (fan off).
- Mixing stopped in the previous position.
- Re-circulation on.
- Compressor off.
- MAX DEF" function cut off if in progress.
ECO" function
The engagement of this function is completely manual and

is obtained through the special switch which makes it

possible to disengage the compressor electromagnetic

clutch.
Compressor control is however linked to other parameters,

namely:
- Outside temperature ( > 5 °C ON" )
- Evaporator temperature ( > 4 °C ON", < 3.5 °C

OFF" )

- Coolant fluid system pressure (min. 3.5 bar, max. 28 bar)
- EDC or EGR control unit (in versions where applicable).
Re-circulation" function
The engagement of this function is completely manual and

is obtained through the special switch which makes it

possible to shut off the outside air inlet.

In the MAX DEF" mode this function is cut off regardless

of the position of the switch.
MAX DEF" function
The engagement of this function is completely manual and

is obtained turning the air distribution clockwise as far as the

MAX DEF" position.
The control unit will be informed of this request by the

closing of a special N.O. microswitch in the rear part of the

knob.
The engagement of this function involves:
- Maximum air flow, regardless of the position of the

knob.

- Air distribution towards the windscreen through

bowden cables.

- Mixing with the highest heat available (memorising the

last position of the motor before leaving the adjustment

state).

- Outside air inlet, regardless of the position of the

re-circulation button.

- Compressor on, regardless of the position of the ECO

button.

Switching this function off the gear motor moves back to the

position memorised previously if the temperature

adjustment knob is not at LO" or HI".
If this function is already selected when the ignition key is

turned on, no position will be memorised, and switching it

off, the adjustment procedure will be started with the mixing

gear motor in the HI" condition.

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Electronic control unit

This automatically controls the system monitoring the thermodynamic parameters in order to provide the suitable climate

(temperature and humidity) required by the driver.

It is located on the lower part of the passenger's side duct unit.

Connector

Pin

Function

1

Signal from treated air temperature sensor

2

Signal from required temperature potentiometer

3

Signal from ventilation control potentiometer

4

Earth

5

Positive from ECO" switch

A

6

Positive from microswitch for MAX DEF" function

A

7

Signal earth

8

Supply (+15/A)

9

5 V supply for ventilation, temperature and air mixing potentiometers

10

Line L for 38-pin diagnostic connector pin 13

11

Line K for 38-pin diagnostic connector pin 14

12

Positive from switch for re-circulation

1

Positive (0 to 8 V) for fan electronic control module (0 to 6 V)

2

Serial line for digital display (instrument cluster pin B 11")

3

Signal from evaporator temperature sensor

4

Reference voltage from air mixing motor (0 to 5 V)

6

Signal from outside temperature sensor

7

Signal from inside temperature sensor

B

8

Negative for fan electronic control module

B

10

Supply (0 to 12 V) for re-circulation gear motor (+12 V for switching on re-circulation)

11

Supply (0 to 12 V) for re-circulation gear motor (+12 V for switching on re-circulation)

12

Key-operated positive supply

13

Positive for compressor control relay

14

Supply (0 to 12V) for air mixing gear motor (+12V with HI" function)

15

Supply (0 to 12V) for air mixing gear motor (+12V with LO" function)

16

Reference voltage from electronic fan control module (0 to 12 V)

A

B

Figure 234

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