Iveco Daily. Manual — part 353
86414
HEATING AND VENTILATION SYSTEM
Description
This is accomplished by combining an air-conditioning system
with a heating system.
This integration enables to change temperature and relative
humidity inside the passenger’s compartment.
Air-conditioning
Air-conditioning is accomplished by taking advantage of the
power of certain ”cooling” gases to lower temperature
considerably at their expansion stage, thereby enabling to
absorb heat from the passenger’s compartment.
This condition is obtained by two different pressure levels
(high pressure when coolant is at liquid state and low pressure
when coolant is at gaseous state) that are established and
maintained during system operation.
Heating
Heating is implemented through a radiator, located in the
heater unit, where engine coolant flows.
Special doors let air flow through the radiator only when the
heating function is activated.
The main heating and ventilation system components are the
following:
- compressor (4);
- condenser (1);
- drier filter (2);
- three-level pressure switch (3);
- expansion valve (13);
- evaporator (12);
- heater/heater fan unit (5);
- pollen filter (14);
- cooler/heater fan unit (8-9) set in the rear area of the
passenger’s compartment;
- passenger’s compartment conditioning circuit enabling
solenoid valve (6);
- additional cooler expansion valve;
- heater/additional heater fan unit (10-11), set in the rear
area of the passenger’s compartment;
- additional heater circuit enabling solenoid valve (15);
Figure 59
FUNCTIONAL DIAGRAM AND MAIN HEATING AND VENTILATION SYSTEM COMPONENTS
A. Coolant inlet to heater - B. Coolant outlet from heater - C. Coolant delivery to additional heater - D. Coolant return from additional heater - E. Coolant return to engine - H. Heating and
ventilation system high pressure circuit - L. Heating and ventilation system low pressure circuit - W. Engine coolant circuit for passenger’s compartment heating - V. Ventilation flow.
1. Condenser - 2. Drier filter - 3. Three-level pressure switch - 4. Compressor - 5. Heater/heater fan unit - 6. Solenoid valve - 7. Expansion valve - 8. Additional cooler 1. Additional heater fan -
10. Additional heater - 11. Additional heater fan - 12. Cooler - 13. Expansion valve - 14. Pollen filter - 15. Solenoid valve.
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PASSENGER’S COMPARTMENT HEATING AND VENTILATION SYSTEM
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Figure 60
86415
1. Passenger’s compartment air intake - 2. Adjustable air vents - 3. Additional cooling system control selector
ADDITIONAL COOLING SYSTEM CONTROLS AND AIR VENTS LAYOUT
DESCRIPTION
The additional cooling system integrates the basic air
conditioning system and implements air cooling and
distribution to the passenger’s compartment area.
This system can therefore be activated just when the main air
conditioning system is working yet. To start cool air
distribution to the passenger’s compartment, use selector (3)
set at the end of the upper duct.
Selector controls additional cooling circuit enabling valve
opening and heater fan speed.
Passenger’s compartment air recovered through air intake (1)
is conveyed by the heater fan through the additional cooler,
it is then cooled, forced into ducts and distributed through the
adjustable air vents (2).
PASSENGER’S COMPARTMENT HEATING AND VENTILATION SYSTEM
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Figure 61
86416
1. Additional heater on button - 2. Additional heater circuit enabling solenoid valve - 3. Additional heater unit - 4. Heater fan -
5. Coolant return pipe - 6. Coolant delivery pipe.
ADDITIONAL HEATING SYSTEM CONTROLS
DESCRIPTION
The passenger’s compartment additional heater unit (3) is
located under the last passenger seat row and can be turned
on just with engine running and cab heater operating in
“heating” mode.
The additional heater is activated through button (1) set on
the instrument panel.
This button controls solenoid valve (2), that deviates the
return pipe flow from cab heater to additional heater (3) and
heater fan (4) that warms and drives air from the passenger’s
compartment through the radiator. Heater fan revs cannot be
adjusted.
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PASSENGER’S COMPARTMENT HEATING AND VENTILATION SYSTEM
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- Disconnect the electrical connection (2) and release
cables from anchoring clip (1).
- Disconnect power cable electrical connection (4) and
release cables from anchoring clips.
- Remove the sealant bead (6), loosen the fastening screws
and remove cool air distribution duct cover (7).
- Loosen the fastening screws (3), and remove the cooling
unit (5) from the wall.
- Turn with extreme care the whole cooling unit to make
the delivery and return pipes come out of the slot on the
floor. Then, remove the unit from the vehicle.
86418
86417
86419
Figure 62
Figure 63
Figure 64
ADDITIONAL COOLING UNIT
Removal - Refitting
- Loosen the fastening screws (1) and remove the
additional cooling unit protection cover (2).
- Loosen connections and disconnect delivery (1) and
return (2) pipes.
- Loosen the fastening screws (3) and remove the flange
(4), withdrawing it from pipes.
For refitting, reverse the removal procedure and top up
coolant as described in the relevant section of this Manual.
Check for regular operation of the components involved in
the above described procedure.
Removal
Place the vehicle on pit or lift taking the required safety
precautions.
Disconnect battery negative and positive terminals.
Drain out coolant from the cooling system as described in the
relevant section of this Manual.
Refitting
PASSENGER’S COMPARTMENT HEATING AND VENTILATION SYSTEM
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