Kia Carnival (2009+). Instruction — part 554

Heating, Ventilation, Air Condi-

tioning

Heater - Fuel Fired Heater

Heating, Ventilation, Air Conditioning

2009 > G 2.7 DOHC >

COMPONENT LOCATION

2009 > G 2.7 DOHC >

DESCRIPTION

The fuel fired heater has been applied to the diesel engine (CRDi) to increase heating capability by using diesel only in
cold weather

• Follow the procedures specified in this bulletin during service or it may cause personal injury.
• Be sure to turn the fuel fired heater off when refueling at station.
• The fuel fired heater must be mounted at designated position, never in the passenger compartment.
• The fuel fired heater must be kept below 120°C or a permanent failure on the components may occur.
• Operational principle : The following 3 conditions should be met at the same time for automatic operation of

the fuel fired heater.

- Engine runs.
- Ambient temperature is lower than 2°C (Winter)
- Coolant temperature is lower than 68°C

• Cleaning process

- A cleaning process of the fuel fired heater will be performed automatically when the heater is not operated

due to increase of coolant temperature and ignition off.

- During cleaning process, supplied fuel in the heater will be burnt completely and any smoke will be

expelled.
It is a necessary process for next operation and durability of the heater and takes about 3 minutes.

• Others

The following symptoms should be explained to customers or technicians as a normal occurrence.

- A white smoke may come out from the fuel fired heater exhaust pipe installed at the front side of the right

front tire during operation of the heater.
This is not an exhaust fumes.
When moisture in the fuel and air is discharged from the heater and is met cold ambient air, it is condensed
and looks like a white smoke however, when an excessive black smoke is discharged, the fuel fired heater
should be inspected.

- A "buk-buk" noise from the heater is a noise to form flame for combustion. This is a normal operation.
- When the heater is operated at full load, a "Wooing" noise is occurred.
- When shutting off the engine during heater operation, a "Wing" noise is occurred to perform the cleaning

process.

OVERVIEW

1. This fuel fired heater supplies additional heat to the interior compartment with a low fuel consumption to

compensate the heat provided by engine alone.

2. The fuel fired heater has been adopted to warm up the interior compartment in a short time.

3. The two coolant temperature sensors are installed to the heater inner. The sensor valves determine heater

operation.

4. One of the temperature sensors functions to prevent the heater from overheating.

If the sensor temperature valve exceeds 125°C, the fuel will be cut and the heater will be deactivated by the
determination of the overheating of the heater.
The other temperature sensor determines the operation mode of the fuel fired heater.The temperature of this
sensor enables to activate the heater at full load(5kw) or half load(2.5kw).
• The coolant temperature shown on the above Figure is the value of the inner sensor and the actual coolant
temperature is higher about 5°C ~7°C than the above value.

OPERATION

Switch on/ Operation start

The fuel fired heater is operated when the coolant temperature is below 68°C and the ambient temperature is below
2°C after starting the engine.
At this time, the glow plug and combustion air fan are operated first and after 30 seconds, the dosing pump is
operated with stopping the combustion fan for 3 seconds.
After that, the operation of the fan increases continuously until it approaches to full load within 56 seconds. If fuel
supply reaches to full load the glow plug does not operate and the operation of the fan reaches to full load.
After that the glow plug monitors ignition condition as a flame sensor for 45 seconds.
The above operation procedure is done automatically and in case the ignition fails, the above operation will be done
again automatically.
If the condition of ignition failure sustains continuously, fuel supply and fan operation will be stopped and error codes
will be stored to find cause of failure.
Generally, the cause of ignition failure during combustion is caused by the automatic re-operation of the above
procedure.

Operation for heating

The fuel fired heater operates at full load when the coolant temperature is below 68°C and the ambient temperature is
below 2°C after starting the engine.
It operates at half load when the coolant temperature is 74°C and it operates at idle mode when the coolant
temperature is 78°C.
The fuel fired heater during the transformation process does a cleaning function from the half mode to the idle mode.
At idle mode, all components do not work.
The fuel fired heater operating at idle mode turns into the half load when the coolant temperature is 74°C. At this time,
if the coolant temperature drops again below 68°C, the heater operates with full load and turns into the idle mode if
the temperature is 78°C.
This serial operating process is performed automatically.

Key switch off / Operation stop

The fuel fired heater ECU stops the operation of the fuel pump and cuts fuel supply when shutting off the engine
during the heater operation.
The heater conducts cleaning operation at this time.
This is a process of burning the fuel completely supplied in the heater inner.